Search

Your search keyword '"Teat, S."' showing total 185 results
Start Over Author "Teat, S."
185 results on '"Teat, S."'

1. Sequential electron transport and vibrational excitations in an organic molecule coupled to few-kayer graphene electrodes

Author

Burzurí, E., Island, J. O., Diaz-Torres, R., Fursina, A., Gonzalez-Campo, A., Roubeau, O., Teat, S. J., Aliaga-Alcalde, N., Ruiz, E., and van der Zant, H. S. J.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Graphene electrodes are promising candidates to improve reproducibility and stability in molecular electronics through new electrode-molecule anchoring strategies. Here we report sequential electron transport in few-layer graphene transistors containing individual curcuminoid-based molecules anchored to the electrodes via pi-pi orbital bonding. We show the coexistence of inelastic co-tunneling excitations with single-electron transport physics owing to an intermediate molecule-electrode coupling; we argue that an intermediate electron-phonon coupling is the origin of these vibrational-assisted excitations. These experimental observations are complemented with density functional theory calculations to model electron transport and the interaction between electrons and vibrational modes of the curcuminoid molecule. We find that the calculated vibrational modes of the molecule are in agreement with the experimentally observed excitations.

Published
2016
Full Text
View/download PDF

3. Luminescent and magnetic [TbEu] 2D metal–organic frameworks.

Author

Bartolomé, E., Arauzo, A., Fuertes, S., Navarro-Spreafica, L., Sevilla, P., Fernández Cortés, H., Settineri, N., Teat, S. J., and Sañudo, E. C.

Subjects
METAL-organic frameworks, TERBIUM, MAGNETIC relaxation, SONICATION, ENERGY transfer, ANTENNAS (Electronics)
Abstract

We present the synthesis, through a simple, microwave-assisted method, of lanthanoid-based 2D metal–organic frameworks (MOFs) of general formula [LnxLn′1−x(MeCOO)(PhCOO)2], including homonuclear compounds (x = 1), Ln＝Eu, Tb, and heterometallic compounds, [TbEu]. The crystalline material is formed by neutral nanosheets held together by van der Waals interactions, which can be easily exfoliated by sonication. Photoluminescent emission in the visible range was observed for all of the synthesized 2D MOF compounds via excitation of the ligand, showing benzoates are efficient antenna ligands. Efficient energy transfer from Tb → Eu was observed in the heterometallic [TbEu] compounds, which could potentially perform as luminescent thermometers. Inks containing nanosheets of 2D MOFs exfoliated in solution were prepared, and luminescent prints of Tb and Eu 2D MOFs on paper were made to show the possible application for anticounterfeiting. Frequency-dependent ac susceptibility results show the occurrence of slow magnetic relaxation in [TbEu] compounds through direct relaxation mechanisms, affected by bottleneck effect. A slowing down of the relaxation time is observed as the Eu/Tb ratio increases. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

6. Phase-mapping of periodically domain-inverted LiNbO3 with coherent X-rays

Author

Hu, Z.H., Thomas, P.A., Snigirev, A., Snigireva, I., Souvorov, A., Smith, P.G.R., Ross, G.W., and Teat, S.

Subjects
Phase distortion (Electronics) -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Research into the possibility of phase-contrast imaging of periodic domain inversion in ferroelectric nonlinear optical materials has used the crystal LiNbO3. A periodically domain-inverted structure for quasi-phase-matching of second-harmonic generation was created in this material, with the direction of spontaneous polarization being sequentially inverted. There were lattice distortions across the domain walls, with these distortions splitting the diffracted wavefront of a beam of coherent X-rays from an advanced synchrotron source.

Published
1998

7. Structural and spectroscopic studies of a rare non-oxido V(v) complex crystallized from aqueous solution† †Electronic supplementary information (ESI) available: Tables containing crystallographic data and structure refinements for Na[V(L)2]·2H2O(cr) (CCDC 1413557) (Table S1) and Na[VO2(HL)](cr) (CCDC 1418830) (Table S2), concentrations of the solution samples for NMR (Table S3), 13C NMR spectra of V(v)/glutaroimide-dioxime complexes in H2 17O (Fig. S1), ESI-MS spectra of V(v)/glutaroimide-dioxime complexes in 17O-enriched H2O diluted and sprayed in methanol (Fig. S2), and EPR spectra of Na[V(L)2]·2H2O(s) at 4 K and 300 K (Fig. S3). CCDC 1413557–1418830. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc03958d Click here for additional data file. Click here for additional data file

Author

Leggett, C. J., Parker, B. F., Teat, S. J., Zhang, Z., Dau, P. D., Lukens, W. W., Peterson, S. M., Cardenas, A. J. P., Warner, M. G., Gibson, J. K., Arnold, J., and Rao, L.

Subjects
Chemistry
Abstract

A non-oxido V(v) complex with glutaroimide-dioxime (H3L), a ligand for recovering uranium from seawater, was synthesized from aqueous solution as Na[V(L)2]·2H2O, and the structure determined by X-ray diffraction., A non-oxido V(v) complex with glutaroimide-dioxime (H3L), a ligand for recovering uranium from seawater, was synthesized from aqueous solution as Na[V(L)2]·2H2O, and the structure determined by X-ray diffraction. It is the first non-oxido V(v) complex that has been directly synthesized in and crystallized from aqueous solution. The distorted octahedral structure contains two fully deprotonated ligands (L3–) coordinating to V5+, each in a tridentate mode via the imide N (R V–N = 1.96 Å) and oxime O atoms (R V–O = 1.87–1.90 Å). Using 17O-labelled vanadate as the starting material, concurrent 17O/51V/1H/13C NMR, in conjunction with ESI-MS, unprecedentedly demonstrated the stepwise displacement of the oxido V 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 1111111111111111111111111111111111 1111111111111111111111111111111111 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 1111111111111111111111111111111111 1111111111111111111111111111111111 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 O bonds by glutaroimide-dioxime and verified the existence of the “bare” V5+/glutaroimide-dioxime complex, [V(L)2]–, in aqueous solution. In addition, the crystal structure of an intermediate 1 : 1 V(v)/glutaroimide-dioxime complex, [VO2(HL)]–, in which the oxido bonds of vanadate are only partially displaced, corroborates the observations by NMR and ESI-MS. Results from this work provide important insights into the strong sorption of vanadium on poly(amidoxime) sorbents in the recovery of uranium from seawater. Also, because vanadium plays important roles in biological systems, the syntheses of the oxido and non-oxido V5+ complexes and the unprecedented demonstration of the displacement of the oxido VO bonds help with the on-going efforts to develop new vanadium compounds that could be of importance in biological applications.

Published
2016

11. New coordination features; a bridging pyridine and the forced shortest non-covalent distance between two CO3 2– species† †Electronic supplementary information (ESI) available: Mass Spectrometry and BVS analysis CCDC 996546–996548. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c4sc02491e Click here for additional data file. Click here for additional data file

Author

Velasco, V., Aguilà, D., Barrios, L. A., Borilovic, I., Roubeau, O., Ribas-Ariño, J., Fumanal, M., Teat, S. J., and Aromí, G.

Subjects
body regions, Chemistry, parasitic diseases, fungi, behavioral disciplines and activities
Abstract

New coordination assemblies furnish a rare crevice pyridine ligand or encapsulation of the closest not bonded CO3 2– species., The aerobic reaction of the multidentate ligand 2,6-bis-(3-oxo-3-(2-hydroxyphenyl)-propionyl)-pyridine, H4L, with Co(ii) salts in strong basic conditions produces the clusters [Co4(L)2(OH)(py)7]NO3 (1) and [Co8Na4(L)4(OH)2(CO3)2(py)10](BF4)2 (2). Analysis of their structure unveils unusual coordination features including a very rare bridging pyridine ligand or two trapped carbonate anions within one coordination cage, forced to stay at an extremely close distance (d O···O = 1.946 Å). This unprecedented non-bonding proximity represents a meeting point between long covalent interactions and “intermolecular” contacts. These original motifs have been analysed here through DFT calculations, which have yielded interaction energies and the reduced repulsion energy experimented by both CO3 2– anions when located in close proximity inside the coordination cage.

Published
2014

12. A rapidly-reversible absorptive and emissive vapochromic Pt(II) pincer-based chemical sensor

Author

Bryant, M. J., primary, Skelton, J. M., additional, Hatcher, L. E., additional, Stubbs, C., additional, Madrid, E., additional, Pallipurath, A. R., additional, Thomas, L. H., additional, Woodall, C. H., additional, Christensen, J., additional, Fuertes, S., additional, Robinson, T. P., additional, Beavers, C. M., additional, Teat, S. J., additional, Warren, M. R., additional, Pradaux-Caggiano, F., additional, Walsh, A., additional, Marken, F., additional, Carbery, D. R., additional, Parker, S. C., additional, McKeown, N. B., additional, Malpass-Evans, R., additional, Carta, M., additional, and Raithby, P. R., additional

Published
2017
Full Text
View/download PDF

15. Use of the Sulfato Ligand in 3d‐Metal Cluster Chemistry: A Family of Hexanuclear Nickel(II) Complexes with 2‐Pyridyl‐Substituted Oxime Ligands

Author

Papatriantafyllopoulou, Constantina, Aromí, Guillem, Tasiopoulos, Anastasios J., Nastopoulos, Vassilios, Raptopoulou, Catherine P., Teat, S. J., Escuer, Albert, Perlepes, Spyros P., Tasiopoulos, Anastasios J. [0000-0002-4804-3822], Papatriantafyllopoulou, Constantina [0000-0002-5652-7747], Nastopoulos, Vassilios [0000-0003-4190-1342], and Raptopoulou, Catherine P. [0000-0002-8775-5427]

Subjects
chemistry.chemical_classification, Ketone, Ligand, Stereochemistry, Cluster chemistry, chemistry.chemical_element, Oxime complexes, Oxime, Sulfato complexes, Medicinal chemistry, Magnetic susceptibility, Inorganic Chemistry, Metal, Nickel, chemistry.chemical_compound, chemistry, visual_art, Magnetic properties, visual_art.visual_art_medium, Molecule, Nickel(II) clusters
Abstract

The initial use of 2-pyridyl-substituted oximes [(py)C(R)-NOH R = Me, Ph]/sulfate blend in nickel(II) chemistry has yielded a family of hexanuclear clusters. The syntheses, structures and magnetic properties are reported of [Ni6(SO4)4-(OH){(py)C(Me)NO} 3{(py)C(Me)NOH}3(MeOH)2(H2O)] (1), [Ni6(SO4)4(OH){(py)C(ph)NO}3{(py) C(ph)NOH}3(MeOH)3] (2) and [Ni6(SO 4)4(OH){(py)C(ph)NO}3{(py)C(ph)NOH} 3(H2O)3] (3), where (py)C(Me)NOH is methyl 2-pyridyl ketone oxime and (py)C(ph)NOH is phenyl 2-pyridyl ketone oxime. The hexanuclear molecules present in the three complexes have similar structures which contain the [Ni6(μ3-OH)(μ3-SO 4)3(μ3-ONR)3]2+ core. The core consists of six NiII ions arranged as two parallel equilateral triangular subunits, one small (Ni⋯Ni ca. 3.3 Å) and the other larger (Ni⋯Ni ca. 6.0 Å). Characteristic IR bands are discussed in terms of the known structures of 1-3. The magnetic properties of 1 and 2 have been studied by variable-temperature dc magnetic susceptibility techniques which indicate antiferromagnetic interactions. A simple 2-J model was found to be adequate to describe the similar thermal variation of the molar magnetic susceptibilities of 1 and 2. © Wiley-VCH Verlag GmbH & Co. KGaA, 2007. 18 2761 2774 Cited By :50

Published
2007
Full Text
View/download PDF

16. Microwave assisted synthesis of heterometallic 3d–4f M4Ln complexes.

Author

Rosado Piquer, L., Dey, S., Castilla-Amorós, L., Teat, S. J., Cirera, J., Rajaraman, G., and Sañudo, E. C.

Subjects
RARE earth metals, MICROWAVES, MAGNETIC properties
Abstract

In this paper we describe the synthesis and magnetic properties of a series of 3d–4f complexes of general formula [M4Ln(OH)2(chp)4(SALOH)5(H2O)(MeCN)(Solv)] (Solv = MeOH, MeCN, H2O; chp stands for deprotonated 6-chloro-2-hydroxypyridine (C5H3ClNO), SALOH stands for monodeprotonated 3,5-ditert-butylsalicylic acid (C15H21O3)) obtained by a solvent-free microwave assisted synthesis method. The Ni(II) complexes (Ni4Gd, Solv = MeOH; Ni4Dy, Solv = MeCN) are not SMMs in the absence of an applied dc field. The replacement of Ni(II) by Co(II) (Co4La, Solv = MeOH; Co4Gd, Solv = H2O; Co4Gd-MeCN, Solv = MeCN; Co4Tb, Solv = MeOH; Co4Dy, Solv = H2O) results in improved SMM properties. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

17. Structural response of KTiOPO4 to electric fields: Effects due to low frequency modulation.

Author

Hamichi, M., Cousins, C. S. G., Meads, R. E., Sheldon, B. J., Teat, S. J., and Thomas, P. A.

Subjects
ELECTRIC fields, POTASSIUM compounds
Abstract

Presents a study which examined the structural response of potassium titanium oxygen phosphorus oxygen[sub4] to square-wave electric fields. Experimental details; Discussion of asymmetric Laue reflections; Interpretations.

Published
1994
Full Text
View/download PDF

18. Structural and optical properties of annealed proton-exchanged waveguides in z-cut LiTaO3.

Author

Åhlfeldt, H., Webjörn, J., Thomas, P. A., and Teat, S. J.

Subjects
WAVEGUIDES, PROTONS, ANNEALING of metals
Abstract

Deals with a study which investigated the structural properties of annealed proton-exchanged waveguides in z-cut LiTaO[sub3]. Preparation of the waveguides; Micrograph of the z face of a proton exchanged LiTaO[sub3]; Infrared-absorption measurements.

Published
1995

19. Metal ion-assisted transformations of 2-pyridinealdoxime and hexafluorophosphate

Author

Konidaris, K. F., Polyzou, C. D., Kostakis, G. E., Tasiopoulos, Anastasios J., Roubeau, O., Teat, S. J., Manessi-Zoupa, E., Powell, A. K., Perlepes, Spyros P., and Tasiopoulos, Anastasios J. [0000-0002-4804-3822]

Subjects
Inorganic chemistry, Inorganic compounds, Picolinic acid, Mediated reactions, As-ligands, Inorganic Chemistry, Metal, Monofluorophosphate, Chemistry, chemistry.chemical_compound, chemistry, visual_art, Hexafluorophosphate, Polymer chemistry, visual_art.visual_art_medium, Metal ions, Hexafluorophosphates
Abstract

Metal-ion mediated reactions of 2-pyridinealdoxime and hexafluorophosphate lead to Zn II complexes containing picolinic acid, picolinamide and monofluorophosphate (-2) as ligands. © 2012 The Royal Society of Chemistry., S.P.P thanks the DFG-funded transregional collaborative research center SFB/TRR 88 “3MET” for support. C.D.P gratefully acknowledges University of Patras for an Erasmus Placement fellowship during her work in Karlsruhe and Alexander Onassis Public Benefit Foundation for a MSc fellowship (G ZG 034/ 2010-2011). E.M.-Z thanks the Research Committee of the University of Patras for financial support (C. Carathéodory Program, Grant 2008, C584). The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

Published
2011

20. Combining Azide, Carboxylate, and 2-Pyridyloximate Ligands in Transition-Metal Chemistry: Ferromagnetic Ni-5(II) Clusters with a Bowtie Skeleton

Author

Papatriantafyllopoulou, Constantina, Stamatatos, Theocharis C., Wernsdorfer, W., Teat, S. J., Tasiopoulos, Anastasios J., Escuer, Albert, Perlepes, Spyros P., Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Tasiopoulos, Anastasios J. [0000-0002-4804-3822], Papatriantafyllopoulou, Constantina [0000-0002-5652-7747], and Stamatatos, Theocharis C. [0000-0002-9798-9331]

Subjects
chemistry.chemical_classification, [PHYS]Physics [physics], Ketone, 010405 organic chemistry, Stereochemistry, Chemistry, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, Magnetic susceptibility, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, Magnetization, Nickel, Crystallography, Transition metal, Molecule, Azide, Carboxylate, Physical and Theoretical Chemistry
Abstract

International audience; The combined use of the anion of phenyl(2-pyridyl)ketone oxime (ppko(-)) and azides (N-3(-)) in nickel(II) carboxylate chemistry has afforded two new Ni-5(II) clusters, [Ni-5(O2CR')(2)(N-3)(4)(ppko)(4)(MeOH)(4)] [R' = H (1), Me (2)]. The structurally unprecedented {Ni-5(mu-N-3)(2)(mu(3)-N-3)(2)}(6+) cores of the two clusters are almost identical and contain the five Ni-II atoms in a bowtie topology. Two N-3(-) ions are end-on doubly bridging and the other two ions end-on triply bridging. The end-on mu(3)-N-3(-) groups link the central Ni-II atoms with the two peripheral metal ions on either side of the molecule, while the Ni center dot center dot center dot Ni bases of the triangles are each bridged by one end-on mu-N-3(-) group. Variable-temperature, solid-state direct(dc) and alternating-current (ac) magnetic susceptibility, and magnetization studies at 2.0 K were carried out on both complexes. The data indicate an overall ferromagnetic behavior and an S = 5 ground state for both compounds. The ac susceptibility studies on 1 reveal nonzero, frequency-dependent out-of-phase (chi(M)'') signals at temperatures below similar to 3:5 K; complex 2 reveals no chi(M)'' signals. However, single-crystal magnetization versus dc field scans at variable temperatures and variable sweep rates down to 0.04 K on 1 reveal no noticeable hysteresis loops, except very minor ones at 0.04 K assignable to weak intermolecular interactions propagated by nonclassical hydrogen bonds.

Published
2010
Full Text
View/download PDF

23. Employment of methyl 2-pyridyl ketone oxime in manganese non-carboxylate chemistry: MnII2MnIV and MnII2MnIII6 complexes

Author

Stoumpos, Constantinos C., Stamatatos, Theocharis C., Sartzi, H., Roubeau, O., Tasiopoulos, Anastasios J., Nastopoulos, Vassilios, Teat, S. J., Christou, George, Perlepes, Spyros P., Department of Chemistry, University of Patras [Greece], Department of Chemistry [Gainesville] (UF|Chemistry), University of Florida [Gainesville] (UF), Centre de recherches Paul Pascal (CRPP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Department of Chemistry, Cyprus, University of Cyprus, Advanced Light Source [LBNL Berkeley] (ALS), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Tasiopoulos, Anastasios J. [0000-0002-4804-3822], Stamatatos, Theocharis C. [0000-0002-9798-9331], Nastopoulos, Vassilios [0000-0003-4190-1342], and Stoumpos, Constantinos C. [0000-0001-8396-9578]

Subjects
Manganese compounds, Ground-state spins, Ketone, Axial anisotropies, synthesis, Nitrogen atoms, Pyridines, methyl 2-pyridyl ketone oxime, Centrosymmetric molecules, Ligands, Mn clusters, Crystallography, X-Ray, 01 natural sciences, Negative ions, chemistry.chemical_compound, Oximes, Electrochemistry, Diagonalization, Pyridyl, Coordination geometry, Prismatic coordinations, chemistry.chemical_classification, Chemistry, article, Inorganic anions, J-values, Bridging ligand, Ketones, Trigonal prismatic molecular geometry, Oxime, methyl 2 pyridyl ketone oxime, Dc susceptibilities, organometallic compound, Variable temperatures, Employment, Atoms, Stereochemistry, pyridine derivative, Carboxylate ligands, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, chemistry, oxime, matrixes, AC magnetic susceptibilities, Inorganic Chemistry, Magnetic susceptibility, Carboxylation, Organometallic Compounds, Molecule, Carboxylate, Manganese, 010405 organic chemistry, X ray crystallography, Mixed valences, 0104 chemical sciences, Oxygen atoms, Oxygen, Crystallography, electrochemistry, U-shaped, Co presences
Abstract

The employment of the anion of methyl 2-pyridyl ketone oxime (mpko(-)) as a tridentate chelating/bridging ligand in manganese chemistry is described. The inorganic anion (Br(-), ClO(4)(-)) used in the reaction affects the identity of the product. The reaction of MnBr(2) and one equivalent of mpkoH in the presence of a base affords [Mn(3)(OMe)(2)(mpko)(4)Br(2)] (3), which is mixed-valence (2Mn(II), Mn(IV)). The central Mn(IV) atom in each of the two, crystallographically independent, centrosymmetric molecules is coordinated by four oximate oxygen atoms belonging to the eta(1):eta(1):eta(1):mu mpko(-) ligands, and two eta(1):mu MeO(-) groups, while six coordination at each terminal Mn(II) atom is completed by four nitrogen atoms belonging to the 'chelating' part of two mpko(-) ligands, and one Br(-) ion. The Mn(II) atoms have trigonal prismatic coordination geometry. The reaction of Mn(ClO(4))(2).6H(2)O, mpkoH and OH(-) (1:2:1) in MeOH gives [Mn(8)O(4)(OMe)(mpko)(9)(mpkoH)](ClO(4))(4) (4), which is also mixed-valence (2Mn(II), 6Mn(III)) and possesses the novel [Mn(8)(mu(3)-O)(4)(mu-OMe)(mu-OR'')(2)](11+) core. The latter possesses a U-shaped sequence of four fused {Mn(II)Mn(III)(2)(mu(3)-O)}(6+) triangular units, with a Mn(III)-Mn(III) edge being shared between the central triangles. Variable-temperature, solid-state dc and ac magnetic susceptibility studies were carried out on complexes 3 and 4 . The dc susceptibility data for 3 in the 5.0-300 K range have been fit to a model with two J values, revealing weak ferromagnetic Mn(II)Mn(IV) (J = +3.4 cm(-1)) and Mn(II)Mn(II) (J' = +0.3 cm(-1)) exchange interactions. Fitting of the magnetization vs. H/T data by matrix diagonalization and including only axial anisotropy (ZFS, D) gave ground state spin (S) and D values of S = 13/2, D = +0.17 cm(-1) for and S = 3, D = -0.09 cm(-1) for 4 . The combined work demonstrates the usefulness of mpko(-) in the preparation of interesting Mn clusters, without requiring the co-presence of carboxylate ligands.

Published
2009
Full Text
View/download PDF

24. 1,2,3-Triazolate-bridged tetradecametallic transition metal clusters [M-14(L)(6)O-6(OMe)(18)X-6] (M = Fe-III, Cr-III and V-III/IV) and related compounds: Ground-state spins ranging from S=0 to S=25 and spin-enhanced magnetocaloric effect

Author

Shaw, R, Laye, RH, Jones, LF, Low, DM, Talbot-Eeckelaers, C, Wei, Q, Milios, CJ, Teat, S, Helliwell, M, Raftery, J, Evangelisti, M, Affronte, M, Collison, D, Brechin, EK, and McInnes, EJL

Subjects
WHEELS, HIGH-NUCLEARITY, MAGNETS, SOLVOTHERMAL SYNTHESIS, DODECANUCLEAR CHROMIUM(III) CAGE
Abstract

We report the synthesis, by solvothermal methods, of the tetradecametallic cluster complexes [M-14(L)(6)O-6(OMe)(18)Cl-6] (M = Fe-III, Cr-III) and [V-14(L)(6)O-6(OMe)(18)Cl6-xOx] (L = anion of 1,2,3-triazole or derivative). Crystal structure data are reported for the {M-14} complexes [Fe-14(C2H2N3)(6)O-6(OMe)(18)Cl-6], [Cr-14(bta)(6)O-6(OMe)(18)Cl-6] (btaH = benzotriazole), [V14O6(Me(2)bta)(6)(OMe)(18)Cl6-xOx] [Me(2)btaH = 5,6-Me-2-benzotriazole; eight metal sites are V-III, the remainder are disordered between {V-III-Cl}(2+) and {(VO)-O-IV}(2+)] and for the distorted [(Fe14O9)-O-III(OH)(OMe)(8)(bta)(7)(MeOH)(5)(H2O)Cl-8] structure that results from non-solvothermal synthetic methods, highlighting the importance of temperature regime in cluster synthesis. Magnetic studies reveal the {Fe-14} complexes to have ground state electronic spins of S

Published
2007

25. Guest-tuned spin crossover in flexible supramolecular assemblies templated by a halide (Cl−, Br− or I−).

Author

Darawsheh, M. D., Barrios, L. A., Aromí, G., Roubeau, O., and Teat, S. J.

Subjects
SUPRAMOLECULAR chemistry, HALIDES, INTERMOLECULAR interactions
Abstract

Ligand 1,3-bis(3-(pyridin-2-yl)-1H-pyrazol-5-yl)benzene, L, forms mononuclear spin crossover complexes [FeL3]2+ with pendant arms that cause them to dimerize through numerous intermolecular interactions forming supramolecular (X@[FeL3]2)3+ cations. They have the flexibility to encapsulate Cl−, Br− or I−, which allow tuning the magnetic properties, in the solid state and in solution. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

29. A ring of rings and other multicomponent assemblies of cages

Author

Whitehead, G, Moro, F, Timco, G, Wernsdorfer, W, Teat, S, Winpenny, R, Whitehead, George F. S., Moro, Fabrizio, Timco, Grigore A., Wernsdorfer, Wolfgang, Teat, Simon J., Winpenny, Richard E. P., Whitehead, G, Moro, F, Timco, G, Wernsdorfer, W, Teat, S, Winpenny, R, Whitehead, George F. S., Moro, Fabrizio, Timco, Grigore A., Wernsdorfer, Wolfgang, Teat, Simon J., and Winpenny, Richard E. P.

Abstract

Ring a ring of roses: Spectacular nanoscale molecular assemblies have been created by design of individual polymetallic components that are then linked together through simple reactions. These include an assembly where six octametallic rings surround a dodecametallic central ring. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Published
2013

30. A Family of Calix[4]arene supported [MnIII2MnII2] Clusters

Author

Taylor, S. M., Karotsis, G., McIntosh, R. D., Kennedy, S., Teat, S. J., Beavers, C. M., Wernsdorfer, W., Piligkos, Stergios, Dalgarno, S. J., Brechin, E. K., Taylor, S. M., Karotsis, G., McIntosh, R. D., Kennedy, S., Teat, S. J., Beavers, C. M., Wernsdorfer, W., Piligkos, Stergios, Dalgarno, S. J., and Brechin, E. K.

Published
2011

31. Stabilisation of a very short Cu-F bond within the protected cavity of a copper(II) compound from a tris(2-aminoethyl)amine derivative

Author

Almesåker, Ann, Gamez, P., Reedijk, J., Scott, J. L., Spiccia, L., Teat, S. J., Almesåker, Ann, Gamez, P., Reedijk, J., Scott, J. L., Spiccia, L., and Teat, S. J.

Abstract

The copper(II) coordination compound of an N-functionalised derivative of tris(2-aminoethyl)amine forms a cavity that is an excellent fluoride ion host, generating a Cu-F entity with a very short distance (182 pm) and characterised by a fluoride ion devoid of any additional intermolecular interactions.

Published
2009

33. Aggregation of [Cu4 II] Building Blocks into [Cu8 II] Clusters or a [C4 II]infinite Chain through Subtle Chemical Control

Author

R¿ntgenparticipatieprogramma, Universiteit Utrecht, Dep Scheikunde, Aromi, G., Ribas, J., Gamez, P., Roubeau, O., Kooijman, H., Spek, A.L., Teat, S., MacLean, E., Stoeckli-Evans, H., Reedijk, J., R¿ntgenparticipatieprogramma, Universiteit Utrecht, Dep Scheikunde, Aromi, G., Ribas, J., Gamez, P., Roubeau, O., Kooijman, H., Spek, A.L., Teat, S., MacLean, E., Stoeckli-Evans, H., and Reedijk, J.

Published
2004

42. Molecular self-recognition: a chiral [Mn(ii)6] wheel via donor–acceptor π…π contacts and H-bonds.

Author

Barrios, L. A., Salinas-Uber, J., Roubeau, O., Teat, S. J., and Aromí, G.

Subjects
HYDROGEN bonding, HYDROPHILIC compounds, LIGAND binding (Biochemistry), INDOLINE, CHEMICAL reactions, CHIRALITY
Abstract

A multinucleating ligand capable of establishing different types of intermolecular interactions, when combined with acetate groups leads to the assembly of a chiral [Mn(ii)3] cluster poised for a process of self-recognition through a combination of perfectly complementary weak forces. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

49. Designed layer assembly: a three-dimensional framework with 74% extra-framework volume by connection of infinite two-dimensional sheetsElectronic supplementary information (ESI) available: structure of the AAA stacked pyridine phase, asymmetric unit of 1, structure of phase 2, thermal stability of phase 2. See http://www.rsc.org/suppdata/cc/b2/b211124c/

Author

Prior, T. J., primary, Bradshaw, D., additional, Teat, S. J., additional, and Rosseinsky, M. J., additional

Published
2003
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results