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1. Interaction of a copper(II)–Schiff base complexes with calf thymus DNA and their antimicrobial activity

Author

T. Plichta, Aladár Valent, Helena Paulíková, Martin Šimkovič, Mária Kožurková, Z. Ondrušová, Danica Sabolová, and Daniela Hudecová

Subjects
Stereochemistry, Radical, Intracellular Space, chemistry.chemical_element, Electrons, Ascorbic Acid, Microbial Sensitivity Tests, Biochemistry, chemistry.chemical_compound, Anti-Infective Agents, Structural Biology, Candida albicans, Animals, Molecular Biology, Schiff Bases, Schiff base, Circular Dichroism, Titrimetry, DNA, General Medicine, Antimicrobial, Ascorbic acid, Copper, Fluorescence, Spectrometry, Fluorescence, Microscopy, Fluorescence, chemistry, Cattle, Titration, Reactive Oxygen Species, Plasmids, Nuclear chemistry
Abstract

The interaction of a copper complexes containing Schiff bases with calf thymus (CT) DNA was investigated by spectroscopic methods. UV–vis, fluorescence and CD spectroscopies were conducted to assess their binding ability with CT DNA. The binding constants K have been estimated from 0.8 to 9.1 × 10 4 M −1 . The percentage of hypochromism is found to be over 70% (from spectral titrations). The results showed that the copper(II) complexes could bind to DNA with an intercalative mode. Synergic action of Cu(II) complexes with ascorbic acid against Candida albicans induced the generation of free radicals and increased (more than 60 times) antimicrobial effect of these complexes.

Published
2011

3. N-salicylidene- <scp>L</scp> -glutamatocopper(II) complexes and their antimicrobial effects

Author

Aladár Valent, Milan Melník, Mária Kohútová, O. ŠvajlenovÁ, Petra Olejníková, and Daniela Hudecová

Subjects
Schiff base, Stereochemistry, Quinoline, chemistry.chemical_element, Biological activity, Glutamic acid, Antimicrobial, Medicinal chemistry, Copper, chemistry.chemical_compound, chemistry, Pyridine, Materials Chemistry, Physical and Theoretical Chemistry, Coordination geometry
Abstract

Reaction of an ethanolic solution of N-salicylidene- l -glutamatodiaquacopper(II) monohydrate with pyridine, 2-methylpyridine, 4-methylpyridine, 2-aminopyridine, 2,6-diaminopyridine, quinoline, 2-methylquinoline, 4-methylquinoline or 3-methylisoquinoline resulted in solid products containing complexes of the type Cu(sal- l -glu)L with distorted square-pyramidal coordination geometry. The products were characterized by elemental analysis, electronic spectroscopy and magnetic susceptibility measurements. Antimicrobial effects were tested on various strains of bacteria, yeasts and filamentous fungi. To compare the influence of individual ligands (neutral as well as anionic) on their biological activity, copper(II) complexes containing water and a Schiff base derived from salicyldehyde and methyl- and ethyl-esters of l -glutamic acid [Cu(sal-5-Me- l -glu)(H2O)2 and Cu(sal-5-Et-l-glu)(H2O)2] were also prepared and studied. Bioactivities of complexes tested were found to decrease in the sequence bacteria > fila...

Published
2004

4. Crystal and electronic structure of aqua(N-salicylidene-methylester-l-glutamato)Cu(II) monohydrate

Author

Pavel Mach, Mária Kohútová, Eva Scholtzová, Aladár Valent, Vratislav Langer, Lubomir Smrcok, and Dalma Gyepesová

Subjects
Inorganic Chemistry, Crystallography, Hydrogen bond, Chemistry, X-ray crystallography, Molecule, General Materials Science, Crystal structure, Bond energy, Condensed Matter Physics, Hydrate, Bond-dissociation energy, Pyramid (geometry)
Abstract

The absolute structure of the title compound, CuNC13H17O7, has been determined. The crystal structure consists of the molecular units Cu(N-sal-5-met-L-glu)(H2O) connected by a three-dimensional network of hydrogen bonds. The coordination polyhedron in the complex is approximately square-pyramidal with a pentacoordinated Cu(II) atom. The base of the pyramid is formed by nitrogen and oxygen atoms belonging to the molecule, while the apex of the pyramid contains a weakly bonded oxygen atom of the carboxylic group of another molecule. The B3LYP/SVP method and basis set in Gaussian98 was used for quantum chemical calculation of the nature of Cu–X (X = O, N) bonds. While the calculated dissociation energy of the weakly bonded crystalline water is only 17.2 kJ/mol, the bonding energy of the water molecule coordinating to the Cu atom is 62.3 kJ/mol.

Published
2004

5. Copper(II) salicylideneglycinate complexes as potential antimicrobial agents

Author

Markku R. Sundberg, Barbora Dudová, Aladár Valent, Milan Melnik, Daniela Hudecová, and Raikko Kivekäs

Subjects
010405 organic chemistry, Dimer, Quinoline, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, Copper, Square pyramidal molecular geometry, 0104 chemical sciences, Inorganic Chemistry, Crystallography, chemistry.chemical_compound, chemistry, Pyridine, Materials Chemistry, Molecule, Physical and Theoretical Chemistry, Isoquinoline, Single crystal
Abstract

The reaction of an ethanolic solutions of N-salicylideneglycinatoaquacopper(II) hemihydrate with urea, pyridine, 2,4-dimethylpyridine, 3,5-dimethylpyridine, quinoline, 4-methylquinoline, isoquinoline, or 3-methylisoquinoline in an equimolar ratio resulted in solid products containing complexes of the type Cu(salgly)L with distorted square pyramidal coordination polyhedra. The products were characterized by elemental analysis, electronic and EPR spectra, and magnetic susceptibility measurements. Moreover, the crystal and molecular structure of N-salicylideneglycinatoureacopper(II) dimer was determined by single crystal X-ray diffraction methods. The copper(II) atoms are bridged by two phenolic oxygen atoms with a CuCu distance of 3.1093(11) A and CuOCu angle of 94.47(12)°. The antimicrobial effects have been tested on various strains of bacteria, yeasts and filamentous fungi.

Published
2002

6. Dimeric (isoquinoline)(N-salicylidene-<scp>D</scp>,<scp>L</scp>-glutamato)copper(II) ethanol solvate

Author

Aladár Valent, Mária Kohútová, Dalma Gyepesová, and Vratislav Langer

Subjects
Aldehydes, Antifungal Agents, Schiff base, Ethanol, Molecular Structure, Stereochemistry, Ligand, Dimer, Glutamic Acid, chemistry.chemical_element, General Medicine, Crystal structure, Isoquinolines, Copper, General Biochemistry, Genetics and Molecular Biology, Anti-Bacterial Agents, Solvent, chemistry.chemical_compound, Crystallography, chemistry, Molecule, Isoquinoline, Dimerization, Schiff Bases
Abstract

The title racemic complex, bis[mu-N-(2-oxidobenzylidene)-D,L-glutamato(2-)]bis[(isoquinoline)copper(II)] ethanol disolvate, [Cu(2)(C(12)H(11)NO(5))(2)(C(9)H(7)N)(2)].2C(2)H(6)O, adopts a square-pyramidal Cu(II) coordination mode with a tridentate N-salicylideneglutamato Schiff base dianion and an isoquinoline ligand bound in the basal plane. The apex of the pyramid is occupied by a phenolic O atom from the adjacent chelate molecule at an apical distance of 2.487 (3) A, building a dimer located on the crystallographic inversion center. The Cu...Cu spacing within the dimers is 3.3264 (12) A. The ethanol solvent molecules are hydrogen bonded to the dimeric complex molecules, forming infinite chains in the a direction. The biological activity of the title complex has been studied.

Published
2009

7. COPPER(II) COORDINATION COMPOUNDS: CLASSIFICATION AND ANALYSIS OF CRYSTALLOGRAPHIC AND STRUCTURAL DATA III. DIMERIC COMPOUNDS

Author

Mária Kabešová, Milan Melnik, Marian Koman, Clive E. Holloway, Ján Garaj, Aladár Valent, and Ľubov Macåškovå

Subjects
chemistry.chemical_classification, Crystallography, chemistry, Stereochemistry, Coordination number, Materials Chemistry, chemistry.chemical_element, Physical and Theoretical Chemistry, Ring (chemistry), Copper, Coordination complex
Abstract

This review summarizes the data for over nine hundred dimeric Cu(II) coordination compounds. There are several types of the bridges, from which doubly bridges by far prevail. The most common ligands are O− and N− donors. From the stereochemical point of view, a square-pyramidal arrangement with different degrees of distortion about Cu(II), is the most common. Several relationships were found between the Cu-Cu distances and the Cu-L-Cu bridge angle and the type of bridging, between the intra-ligand L-Cu-L ring angles and coordination numbers.

Published
1998

8. (1-Methylimidazole)(N-salicylidene-rac-glutamato)copper(II)

Author

Vratislav Langer, Mária Kohútová, Aladár Valent, Dalma Gyepesová, and Eva Scholtzová

Subjects
Schiff base, Ligand, chemistry.chemical_element, General Chemistry, Electronic structure, Condensed Matter Physics, Copper, chemistry.chemical_compound, Crystallography, chemistry, X-ray crystallography, Molecule, General Materials Science, 1-Methylimidazole
Abstract

The title racemic compound, [Cu(C12H11NO5)(C4H6N2)], adopts a square-planar copper(II) coordination mode with the tridentate N-salicylidenglutamato Schiff base dianion and the 1-methylimidazole ligand. Dimers of centrosymmetrically related molecules are formed. The theoretical investigation of the electronic structure of the title compound by the B3LYP method is presented.

Published
2003

9. Copper(II) Dihydroxybenzoates; Synthesis and Properties

Author

Sokolík J, Tumová I, Gustav Plesch, Juraj Krätsmar-Smogrovic, Svec P, Brigita Lučanská, and Aladár Valent

Subjects
Magnetic moment, Chemistry, Inorganic chemistry, chemistry.chemical_element, General Chemistry, Copper, law.invention, Ion, Tetragonal crystal system, chemistry.chemical_compound, Dextran, law, Composition (visual arts), Electron paramagnetic resonance, Nuclear chemistry
Abstract

Compounds of composition Cu(2,5-DHB)2 . 4 H2O (DHB, dihydroxybenoate anion) and Cu(2,Y-DHB)2 . 8 H2O (Y = 4 or 6) were prepared as potential antiinflamatory gents with a view of pharmacological screening. The room-temperature magnetic moments allow to classify all compounds into the group of magnetically diluted copper(II) complexes. According the EPR and electronic spectra, the degree of tetragonal distortion increases passing from Cu(2,6-DHB)2 . 8 H2O (III) through Cu(2,4-DHB)2 . 8 H2O (I) to Cu(2,5-DHB)2 . 4 H2O (II. The complexes differ also in the cooperative ordering in their structures. All tested compounds exhibit higher antiinflamatory activities (on dextran edema) than free carboxylic acids. However, their effects were accompanied with relatively high toxicity. Remarkable results were also achieved on evaluating the antipyretic activity.

Published
1993

12. Distortion Isomerism in the Chemistry of Heterometallic Tin Clusters

Author

Aladár Valent, Ján Garaj, Milan Melnik, and Mária Kohútová

Subjects
Chemistry, Distortion, Materials Chemistry, Metals and Alloys, Physical chemistry, chemistry.chemical_element, General Chemistry, Condensed Matter Physics, Photochemistry, Tin, QD1-999
Published
2009

13. Structural Aspects of Cadmium(II) Complexes - Isomers

Author

Mária Kohútová, Aladár Valent, and Milan Melnik

Subjects
Chemistry, Cadmium, Materials Chemistry, Metals and Alloys, chemistry.chemical_element, General Chemistry, Condensed Matter Physics, QD1-999, Medicinal chemistry
Published
2009

14. Study of immobilized and extracellular aminopeptidases of watermelon

Author

Peter Siekel, Eva Sedlárová, Elmíra Tokhtaeva, Aladár Valent, and Alfred Barth

Subjects
Histology, Cell Membrane Permeability, Time Factors, Alginates, Cell Survival, Polysorbates, Biology, Aminopeptidase, Aminopeptidases, Citrullus, chemistry.chemical_compound, Extracellular, Anilides, chemistry.chemical_classification, Substrate (chemistry), Hydrogels, Cell Biology, General Medicine, Cells, Immobilized, Amino acid, Enzyme, chemistry, Biochemistry, Glutaral, Self-healing hydrogels, Pectins, Glutaraldehyde, Intracellular
Abstract

Watermelon cells after permeabilization in Tween 80 were immobilized by glutaraldehyde without any carrier. Cells immobilized by cross-linking demonstrated significantly lower aminopeptidase activities than untreated cells. Pectate and alginate hydrogels were used successfully for immobilization of watermelon cells which retained activities of some aminopeptidases. A simple and rapid procedure for determination of extracellular aminopeptidases was developed using a synthetic substrate. p-Nitroanilides of amino acids were used as substrates for the determination of the extracellular and intracellular enzymatic activities. The culture medium (without cells) was used for the identification and determination of extracellular enzyme activities, whereas intracellular activities were estimated from the cell suspension.

Published
2005

15. Thiohydrazone copper(II) complexes. The relationship between redox properties and superoxide dismutase mimetic activity

Author

Mª Teresa Sevilla, Aladár Valent, Zdena Ďuračková, and Ma Antonia Mendiola

Subjects
Thiosemicarbazones, Coordination sphere, Stereochemistry, Biophysics, chemistry.chemical_element, Ligands, Redox, Medicinal chemistry, Coordination complex, Electrochemistry, Chelation, Dimethyl Sulfoxide, Physical and Theoretical Chemistry, Chelating Agents, chemistry.chemical_classification, Binding Sites, Ligand, Superoxide Dismutase, Copper, Non-innocent ligand, Solutions, chemistry, Spectrophotometry, Ultraviolet, Cyclic voltammetry, Oxidation-Reduction
Abstract

The redox behaviour of copper(II) complexes with the open chain ligand, benzilbisthiosemicarbazone, and the macrocyclic one [3,4,10,11-tetraphenyl-1,2,5,8,9,12,13-octaazacyclotetradeca-7,14- dithione- 2,4,9,11-tetraene] has been explored by cyclic voltammetry. The half-wave potential values for the copper(II)/copper(I) redox couple and the spectral data obtained on dimethylsulfoxide (DMSO) solution agree with the superoxide dismutase (SOD)-mimetic activity of the complexes. The macrocyclic complexes show more positive reduction potential and more activity than the open chain derivatives. From our results it follows that the structure and conformation of ligand has influence on the redox potential of central atom in coordination compound. The changes in the coordination sphere are connected with the change of biological function of compounds represented by SOD-mimic activity. In addition, the L1H6 derivatives show quasireversible waves associated to Cu(II)/Cu(III) process.

Published
1999

17. Transition-Metal Phthalocyanins as Catalysts for Alkene Epoxidation

Author

Lija Tekenbergs-Hjelte, Aladár Valent, Erik Larsen, Christian Pedersen, Juraj Krätsmar-Smogrovic, Inger Hagin, Karl Anker Jørgensen, Sam Larsson, Magnus Erickson, Svante Johansson, Inge Lundt, Kurt-Jürgen Hoffman, Tomas Alminger, Kristina Ohlson, Ingalil Löfberg, Inger Grundevik, Inger Skånberg, Brigitta Lucanska, and Björn Persson

Subjects
Transition metal, Chemistry, General Chemical Engineering, Polymer chemistry, Alkene epoxidation, Catalysis
Published
1989

18. A New Hydrogen Electrode Applied to the Protolysis of Acetic Acid in Potassium Acetate Solutions

Author

Tomas Alminger, Inger Skånberg, Kristina Ohlson, Sine Larsen, Lene Teuber, Lija Tekenbergs-Hjelte, Kurt-Jürgen Hoffman, Magnus Erickson, Inger Grundevik, Ingalil Löfberg, Aladár Valent, Svante Johansson, Anders Molin, Björn Persson, Sam Larsson, Juraj Krätsmar-Smogrovic, Inger Hagin, Brigitta Lucanska, and George Biedermann

Subjects
Acetic acid, chemistry.chemical_compound, Standard hydrogen electrode, chemistry, General Chemical Engineering, Potassium, Hydroxyl value, chemistry.chemical_element, Nuclear chemistry
Published
1989

19. Equilibrium and Structural Studies of Silicon(IV) and Aluminium(III) in Aqueous Solution. 20. Composition and Stability of Aluminium Complexes with Propionic Acid and Acetic Acid

Author

Kristina Ohlson, Magnus Erickson, Kurt-Jürgen Hoffman, Inger Grundevik, Björn Persson, Ewa Huskowska, Sam Larsson, Ingalil Löfberg, Staffan Sjöberg, Svante Johansson, Lija Tekenbergs-Hjelte, Lars-Olof Öhman, Eva Marklund, Juraj Krätsmar-Smogrovic, Inger Hagin, Aladár Valent, Mauri Lounasmaa, Inger Skånberg, and Tomas Alminger

Subjects
Acetic acid, chemistry.chemical_compound, Aqueous solution, Silicon, Chemistry, Aluminium, General Chemical Engineering, Inorganic chemistry, chemistry.chemical_element, Composition (visual arts)
Published
1989

20. The Crystal and Molecular Structures of Five Nitrophenolates: Potassium 4-Nitrophenolate Monohydrate, Potassium 2-Chloro-4-Nitrophenolate Monohydrate, Potassium 4-Chloro-2-Nitrophenolate Monohydrate, Ammonium 2-Chloro-4,6-Dinitrophenolate Sesquihydrate, and Potassium 2,6-Dinitrophenolate

Author

Juraj Krätsmar-Smogrovic, I.G. Krogh Andersen, E. Krogh Andersen, Inger Hagin, Sam Larsson, Svante Johansson, Kristina Ohlson, Björn Persson, Ingalil Löfberg, Kurt-Jürgen Hoffman, G. Ploug-Sørensen, Inger Grundevik, Magnus Erickson, Aladár Valent, Mauri Lounasmaa, Ewa Huskowska, Inger Skånberg, Tomas Alminger, and Lija Tekenbergs-Hjelte

Subjects
Crystal, chemistry.chemical_compound, Chemistry, General Chemical Engineering, Potassium, chemistry.chemical_element, Ammonium, Nuclear chemistry
Published
1989

21. Effects of Molecular Association on the Rates of Hydrolysis of Long-Chain Alkyl Betainates (Alkoxycarbonyl-N,N,N-Trialkylmethanaminium Halides)

Author

Björn Persson, Aladár Valent, Ingalil Löfberg, Svante Johansson, Inger Grundevik, Magnus Erickson, Lene Teuber, Inger Skånberg, Kurt-Jürgen Hoffman, Lija Tekenbergs-Hjelte, Juraj Krätsmar-Smogrovic, Richard A. Thompson, Sam Larsson, Brigitta Lucanska, Inger Hagin, Stig Allenmark, Tomas Alminger, Kristina Ohlson, and Sine Larsen

Subjects
chemistry.chemical_classification, Hydrolysis, chemistry, General Chemical Engineering, Halide, Organic chemistry, Medicinal chemistry, Long chain, Alkyl
Published
1989

23. Kinetics of Pitting Corrosion on Zirconium in Mixed Chloride-Sulfate Solutions

Author

Lija Tekenbergs-Hjelte, Magnus Erickson, I.G. Krogh Andersen, Svante Johansson, G. Ploug-Sørensen, Mauri Lounasmaa, Kurt-Jürgen Hoffman, Kristina Ohlson, Tomas Alminger, Aladár Valent, Ewa Huskowska, Sam Larsson, Inger Skånberg, Inger Grundevik, Sverre Hornkjøl, Juraj Krätsmar-Smogrovic, Inger Hagin, Ingalil Löfberg, and Björn Persson

Subjects
chemistry.chemical_compound, Zirconium, Chemistry, General Chemical Engineering, Kinetics, medicine, Pitting corrosion, chemistry.chemical_element, Sulfate, Chloride, Nuclear chemistry, medicine.drug, Corrosion
Published
1989

24. The Reaction between Tris(4-bromophenyl)aminium Ion and Acetate Ion is an Electrophilic Reaction!

Author

Ingalil Löfberg, Magnus Erickson, Björn Persson, Lennart Eberson, Juraj Krätsmar-Smogrovic, Aladár Valent, Inger Hagin, Kurt-Jürgen Hoffman, Inger Grundevik, Lija Tekenbergs-Hjelte, Berit Olofsson, Svante Johansson, Tomas Alminger, Brigitta Lucanska, Inger Skånberg, Kristina Ohlson, Sine Larsen, Sam Larsson, and Lene Teuber

Subjects
Tris, chemistry.chemical_compound, chemistry, General Chemical Engineering, Electrophile, Polymer chemistry, Organic chemistry, Acetate ion, Ion
Published
1989

25. Feeding Experiments with Precursors of Tropane Alkaloids Using Suspension Cultures of Atropa belladonna

Author

Ingalil Löfberg, Aladár Valent, Aarne Martinsen, Magnus Erickson, Kristina Ohlson, Aarre Huhtikangas, Svante Johansson, Inger Skånberg, Kurt-Jürgen Hoffman, Liisa Kaarina Simola, Juraj Krätsmar-Smogrovic, Mauri Lounasmaa, Lija Tekenbergs-Hjelte, Reija Jokela, Inger Hagin, Tomas Alminger, Björn Persson, Sam Larsson, and Inger Grundevik

Subjects
chemistry.chemical_compound, Traditional medicine, Atropa belladonna, Chemistry, General Chemical Engineering, Tropane, Suspension culture
Published
1989

26. Prediction of Entropy of Vaporization Based on Correlation with the Normal Boiling Point

Author

Magnus Erickson, Björn Persson, Aladár Valent, Inger Grundevik, Kristina Ohlson, Sam Larsson, Tomas Alminger, Per-Erik Werner, Ingalil Löfberg, Svante Johansson, Inger Skånberg, Brigitta Lucanska, Juraj Krätsmar-Smogrovic, Inger Hagin, Lija Tekenbergs-Hjelte, Lars Eriksson, Marianne Westdahl, Kurt-Jürgen Hoffman, and Reidar Stølevik

Subjects
Boiling point, Chemistry, General Chemical Engineering, Thermodynamics, Entropy of vaporization
Published
1989

27. Prediction of Standard Heat Capacity and Entropy of Inorganic XY3, XY4 and XY5 Gases at 25 degrees C Based on Correlation with the Normal Boiling Point

Author

Sam Larsson, Inger Grundevik, Mauri Lounasmaa, Lija Tekenbergs-Hjelte, G. Ploug-Sørensen, Juraj Krätsmar-Smogrovic, Inger Hagin, Ingalil Löfberg, Kristina Ohlson, Björn Persson, Svante Johansson, Ewa Huskowska, Reidar Stølevik, Tomas Alminger, Inger Skånberg, I.G. Krogh Andersen, Kurt-Jürgen Hoffman, Aladár Valent, and Magnus Erickson

Subjects
Boiling point, Chemistry, General Chemical Engineering, Volumetric heat capacity, Thermodynamics, Heat capacity ratio, Heat capacity
Published
1989

28. The Protonation of the Anthracene Anion Radical in Dimethyl Sulfoxide Using Phenol and the Phenol/Phenolate Complex as Proton Sources: A Well Behaved Process

Author

Inger Skånberg, Mauri Lounasmaa, Magnus Erickson, Ingalil Löfberg, Kurt-Jürgen Hoffman, Ole Hammerich, Merete Folmer Nielsen, Lija Tekenbergs-Hjelte, Juraj Krätsmar-Smogrovic, Svante Johansson, Tomas Alminger, Inger Grundevik, Kjell Undheim, Inger Hagin, G. Hagelin, Aladár Valent, Björn Persson, Kristina Ohlson, and Sam Larsson

Subjects
Anthracene, chemistry.chemical_compound, chemistry, Proton, Dimethyl sulfoxide, General Chemical Engineering, Phenol, Protonation, Photochemistry, Ion
Published
1989

29. The Crystal and Molecular Structure of Diaquatetrakis(mu-2-nitrophenoxyacetato-O,O')dicopper(II) Dihydrate

Author

Aladár Valent, Marianne Westdahl, Per-Erik Werner, Juraj Krätsmar-Smogrovic, Volrath Adelsköld, and Milan Zemlicka

Subjects
chemistry.chemical_classification, General Chemical Engineering, Inorganic chemistry, Nitro compound, Crystal structure, Crystal, chemistry.chemical_compound, Crystallography, chemistry, X-ray crystallography, Molecule, Carboxylate, Hydrate, Inorganic compound
Abstract

Ce complexe cristallise dans P1 avec Z=1; affinement jusqu'a R=0,071. Distance cuivre-cuivre de 2,655 A

Published
1985

30. Efficient Synthesis of Silyloxy Dienes from alpha,beta-Unsaturated Ketones

Author

Juraj Krätsmar-Smogrovic, Ingalil Löfberg, Svante Johansson, Magnus Erickson, Inger Skånberg, Aladár Valent, Inger Hagin, Tomas Alminger, Rolf Carlson, Sam Larsson, Brigitta Lucanska, Lija Tekenbergs-Hjelte, Björn Persson, Kurt-Jürgen Hoffman, Lars Hansson, Kristina Ohlson, Sine Larsen, Inger Grundevik, and Lene Teuber

Subjects
Stereochemistry, Chemistry, General Chemical Engineering, Alpha (ethology), Beta (finance)
Published
1989

31. The Conductivity Behaviour of Bis[tri(4-methylphenyl)-phosphine]iminium Chloride in Dilute Aqueous Solution

Author

Magnus Erickson, Kristina Ohlson, Juraj Krätsmar-Smogrovic, Jon Songstad, Svante Johansson, Aladár Valent, Inger Hagin, Terje Palmesen, Per-Erik Werner, Ingalil Löfberg, Inger Skånberg, Kurt-Jürgen Hoffman, Inger Grundevik, Lija Tekenbergs-Hjelte, Brigitta Lucanska, Sam Larsson, Tomas Alminger, Marianne Westdahl, and Björn Persson

Subjects
chemistry.chemical_compound, Aqueous solution, Chemistry, General Chemical Engineering, Inorganic chemistry, medicine, Iminium, Conductivity, Chloride, Phosphine, medicine.drug
Published
1989

32. Crystal Structure and Magnetic Properties of the beta-Modification of Diaquatetrakis(mu-2-methoxybenzoato-O,O')dicopper(II)

Author

Lars Eriksson, Marianne Westdahl, Ingalil Löfberg, Inger Grundevik, Juraj Krätsmar-Smogrovic, Kurt-Jürgen Hoffman, Volrath Adelsköld, Inger Hagin, Tomas Alminger, Kristina Ohlson, Lija Tekenbergs-Hjelte, Brigitta Lucanska, Inger Skånberg, Sam Larsson, Per-Erik Werner, Svante Johansson, Aladár Valent, Björn Persson, and Magnus Erickson

Subjects
Crystallography, Chemistry, General Chemical Engineering, Crystal structure, Beta (finance)
Published
1989

33. Synthesis of Unsaturated Chloromethyl Ethers

Author

Kurt-Jürgen Hoffman, Magnus Erickson, Øyvind Antonsen, Kristina Ohlson, Mauri Lounasmaa, Inger Skånberg, Tore Benneche, Aladár Valent, G. Hagelin, Tomas Alminger, Svante Johansson, Kjell Undheim, Lija Tekenbergs-Hjelte, Ingalil Löfberg, Inger Grundevik, Juraj Krätsmar-Smogrovic, Sam Larsson, Björn Persson, and Inger Hagin

Subjects
Chemistry, General Chemical Engineering, Organic chemistry
Published
1989

36. Crystal Structure of Holmium Aspartate Chloride Hydrate Ho(L-Asp)Cl2.6H2O

Author

Ewa Huskowska, Magnus Erickson, Peder Kierkegaard, Kurt-Jürgen Hoffman, Ingeborg Csöregh, Tomas Alminger, Svante Johansson, Inger Skånberg, Janina Legendziewicz, Juraj Krätsmar-Smogrovic, Ingalil Löfberg, Inger Hagin, Inger Grundevik, Mauri Lounasmaa, Aladár Valent, Björn Persson, Sam Larsson, Lija Tekenbergs-Hjelte, and Kristina Ohlson

Subjects
Crystallography, chemistry, General Chemical Engineering, medicine, chemistry.chemical_element, Crystal structure, Holmium, Hydrate, Chloride, medicine.drug
Published
1989

37. Facile Synthesis of Racemic 3-Acetoxy-2,6-dimethyl-1,5-heptadiene, the Sex Pheromone of the Comstock Mealybug

Author

Ingalil Löfberg, Sam Larsson, Svante Johansson, Aladár Valent, Ewa Huskowska, Lars Skattebøl, Björn Persson, Kristina Ohlson, Inger Grundevik, Inger Skånberg, Lija Tekenbergs-Hjelte, Juraj Krätsmar-Smogrovic, Magnus Erickson, Yngve Stenstrøm, Kurt-Jürgen Hoffman, Mauri Lounasmaa, Staffan Sjöberg, Tomas Alminger, and Inger Hagin

Subjects
biology, Stereochemistry, Chemistry, General Chemical Engineering, Sex pheromone, Mealybug, biology.organism_classification
Published
1989

38. Structural Aspects of Stable Dibenzyl Triselenides. The Crystal Structures of Bis(2,4-dichlorobenzyl) Triselenide and Bis(2,6-dichlorobenzyl) Triselenide

Author

Björn Persson, Magnus Erickson, Juraj Krätsmar-Smogrovic, Kurt-Jürgen Hoffman, Kristina Ohlson, Sine Larsen, Lija Tekenbergs-Hjelte, Ingalil Löfberg, Inger Hagin, Aladár Valent, Sam Larsson, Svante Johansson, Flemming Splidsboel Hansen, Brigitta Lucanska, Inger Skånberg, Lene Teuber, Tomas Alminger, Inger Grundevik, and Lars Henriksen

Subjects
Crystallography, Chemistry, General Chemical Engineering, Crystal structure
Published
1989

39. Microwave Spectrum, Conformational Equilibria, Intramolecular Hydrogen Bonding, Dipole Moment and Centrifugal Distortion of 3-Hydroxypropanenitrile

Author

Harald Møllendal, Per-Erik Werner, Milan Zemlicka, Marianne Westdahl, K.-M. Marstokk, and Aladár Valent

Subjects
Quantitative Biology::Biomolecules, Nitrile, Mathematics::General Mathematics, Hydrogen bond, Stereochemistry, General Chemical Engineering, Rotational transition, Dipole, chemistry.chemical_compound, Crystallography, Deuterium, chemistry, Intramolecular force, Moment (physics), Physics::Atomic Physics, Rotational spectroscopy
Abstract

On montre que la conformation gauche de l'atome lourd, lie par hydrogene, pour la molecule est la plus stable

Published
1985

40. The Base-Catalysed Rearrangement of Dibromo Alditols via Epoxide Migration

Author

Magnus Erickson, Svante Johansson, Inger Grundevik, Juraj Krätsmar-Smogrovic, Inger Hagin, Kurt-Jürgen Hoffman, Brigitta Lucanska, Ingalil Löfberg, Inger Skånberg, Inge Lundt, Tomas Alminger, Sam Larsson, Kristina Ohlson, Björn Persson, Aladár Valent, Klaus Bock, Lija Tekenbergs-Hjelte, Christian Pedersen, and Ines Maya Castilla

Subjects
chemistry.chemical_compound, chemistry, General Chemical Engineering, Polymer chemistry, Organic chemistry, Epoxide, Base (exponentiation)
Published
1989

42. Bis-Silyloxydienes from Diketones

Author

Staffan Sjöberg, Inger Skånberg, Juraj Krätsmar-Smogrovic, Sam Larsson, Svante Johansson, Mauri Lounasmaa, Inger Hagin, Inger Grundevik, Lars Hansson, Lija Tekenbergs-Hjelte, Kristina Ohlson, Tomas Alminger, Björn Persson, Kurt-Jürgen Hoffman, Aladár Valent, Magnus Erickson, Ingalil Löfberg, Rolf Carlson, and Ewa Huskowska

Subjects
Chemistry, General Chemical Engineering, Medicinal chemistry
Published
1989

43. ESR Spectra of Nitroxide Radicals Formed from Some 4-Nitrosopyrazole Derivatives in the Trapping of .CH2OH and .CH3 Radicals

Author

Lene Teuber, Lija Tekenbergs-Hjelte, Inger Skånberg, Hans Leijonmarck, Inger Grundevik, Jonas Ölund, Brigitta Lucanska, Tomas Alminger, Kurt-Jürgen Hoffman, Ingalil Löfberg, Carl Lagercrantz, Magnus Erickson, Björn Persson, Svante Johansson, Aladár Valent, Sam Larsson, Juraj Krätsmar-Smogrovic, Inger Hagin, and Kristina Ohlson

Subjects
Esr spectra, Nitroxide mediated radical polymerization, Chemistry, General Chemical Engineering, Radical, Trapping, Photochemistry
Published
1989

45. A Concise Synthesis of (2S,5R)-2-Methyl-5-hexanolide

Author

Magnus Erickson, Svante Johansson, Svante Brandänge, Björn Persson, Inger Grundevik, Aladár Valent, Jonas Ölund, Lija Tekenbergs-Hjelte, Sam Larsson, Juraj Krätsmar-Smogrovic, Lene Teuber, Kurt-Jürgen Hoffman, Hans Leijonmarck, Inger Hagin, Brigitta Lucanska, Ingalil Löfberg, Tomas Alminger, Inger Skånberg, and Kristina Ohlson

Subjects
Chemistry, General Chemical Engineering, Organic chemistry
Published
1989

46. Studies on Five-coordinated d8 Metal Ions. Part II. The Displacement of 1,10-Phenanthroline by the Reaction of the Five-coordinate Cyanobis(1,10-phenanthroline)platinum(II) Cation with Cyanide

Author

Per-Erik Werner, Milan Zemlicka, Marianne Westdahl, Aladár Valent, Ole Wernberg, and O. J. Kleppa

Subjects
Reaction mechanism, chemistry.chemical_compound, chemistry, General Chemical Engineering, Phenanthroline, Cyanide, Metal ions in aqueous solution, Kinetics, Inorganic chemistry, chemistry.chemical_element, Displacement (orthopedic surgery), Platinum
Published
1985

47. Frequency dependence of the shear moduli of spectrin studied using a multiple lumped resonator viscoelastometer

Author

Marit Liland Sandvold, Arne Mikkelsen, Arnljot Elgsaeter, Reija Jokela, Mauri Lounasmaa, Juraj Krätsmar-Smogrovic, Aladár Valent, Tomas Alminger, Magnus Erickson, Inger Grundevik, Inger Hagin, Kurt-Jürgen Hoffman, Svante Johansson, Sam Larsson, Ingalil Löfberg, Kristina Ohlson, Björn Persson, Inger Skånberg, and Lija Tekenbergs-Hjelte

Subjects
Chemistry, Protein Conformation, Viscosity, General Chemical Engineering, Dimer, Relaxation (NMR), Erythrocyte Membrane, Biophysics, Spectrin, Molecular physics, Spectral line, Elasticity, Shear (sheet metal), chemistry.chemical_compound, Resonator, Microsecond, Nuclear magnetic resonance, Biopolymers, Ionic strength, Humans
Abstract

The frequency dependence (119-7860 Hz) of the storage and loss shear moduli, G' and G'', of human erythrocyte spectrin dimer crude solutions at 22.5 degrees C has been measured using a Birnboim-Schrag multiple lumped resonator viscoelastometer. The measurements were carried out on solutions of ionic strength 1 mM containing 1.1-3.7 mg ml-1 spectrin. This corresponds to the terminal zone for G' and G''. Analysis of the data using the standard theory of hybrid relaxation spectra yields a relaxation time of 22.5 +/- 1 microseconds. The pure spectrin dimer relaxation time is estimated to be 16 +/- 3 microseconds. This result suggests that at an ionic strength of 1 mM, the spectrin dimers are extended and that the main relaxation process is simple end-over-end rotation.

Published
1989

48. The Crystal Structure of Potassium Tetraiodoplatinate(II) Dihydrate

Author

Ingalil Löfberg, Åke Oskarsson, Björn Persson, Lija Tekenbergs-Hjelte, Aladár Valent, Lene Teuber, Inger Grundevik, Kristina Ohlson, Magnus Erickson, Sine Larsen, Brigitta Lucanska, Svante Johansson, Lars-Fride Olsson, Sam Larsson, Juraj Krätsmar-Smogrovic, Inger Hagin, Inger Skånberg, Tomas Alminger, and Kurt-Jürgen Hoffman

Subjects
Crystallography, Chemistry, General Chemical Engineering, Potassium, chemistry.chemical_element, Crystal structure
Published
1989

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