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Your search keyword '"Bendikov, M."' showing total 3 results
Start Over Author "Bendikov, M." Topic chemistry.chemical_compound
3 results on '"Bendikov, M."'

1. A Magnetostructural Investigation of an Abrupt Spin Transition for 1-Phenyl-3-trifluoromethyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl

Author

Constantinides, Christos P., Berezin, Andrey A., Zissimou, Georgia A., Manoli, Maria, Leitus, G. M., Bendikov, M., Probert, M. R., Rawson, J. M., Koutentis, Panayiotis Andreas, Constantinides, Christos P. [0000-0001-6364-1102], and Zissimou, Georgia A. [0000-0003-4821-9469]

Subjects
Low temperature phase, cooling, Spin transition, cyclic potentiometry, heating, triazine derivative, 1 phenyl 3 tri fluoromethyl 1,4 dihydrobenzo[e][1,2,4]triazin 4 yl, low temperature, Biochemistry, Catalysis, high temperature, Paramagnetism, chemistry.chemical_compound, Singlet ground state, magnetometry, First order transitions, Colloid and Surface Chemistry, Phase (matter), controlled study, Noninteracting, Weakly bound dimers, density functional theory, radical, dimerization, Structural phasis, Trifluoromethyl, Spins, Condensed matter physics, chemical interaction, Chemistry, article, solid state, General Chemistry, dimer, unclassified drug, Crystallography, phase transition, High temperature phase, Synthesis (chemical), magnetism, chemical structure, Diamagnetism, entropy
Abstract

1-Phenyl-3-trifluoromethyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl is the first example of a hydrazyl radical that shows a reversible sharp spin transition fully completed within 5(1) K. The nominally first-order transition takes place at ca. 58(2) K and proceeds via subtle changes of intra- and interstack interactions between two similar structural phases. The low-temperature phase (5-60 K) is diamagnetic and has a singlet ground state (2Jexp = -166.8 cm-1, gsolid = 2.0042, ρ = 0.2%) stemming from a multicenter two-electron interaction. The high-temperature phase (60-300 K) is paramagnetic as a result of noninteracting S = 1/2 spins arising from weakly bound dimers. © 2014 American Chemical Society. 136 34 11906 11909 Cited By :18

Published
2014
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2. Spin-triplet excitons in 1,3-diphenyl-7-(fur-2-yl)-1,4-dihydro-1,2,4- benzotriazin-4-yl

Author

Constantinides, Christos P., Carter, E., Murphy, D. M., Manoli, Maria, Leitus, G. M., Bendikov, M., Rawson, J. M., Koutentis, Panayiotis Andreas, Koutentis, Panayiotis Andreas [0000-0002-4652-7567], and Constantinides, Christos P. [0000-0001-6364-1102]

Subjects
X ray diffraction, Dimer, Exciton, Photochemistry, 1,2,4 benzotriazine derivative, Catalysis, high temperature, chemistry.chemical_compound, Triplet exciton, 1,3 diphenyl 7 (fur 2 yl) 1,4 dihydro 1,2,4 benzotriazin 4 yl, Materials Chemistry, Triplet state, Spin (physics), Spectroscopy, temperature dependence, radical, Exchange interaction, electron spin resonance, Metals and Alloys, article, ferrocene, temperature, General Chemistry, X ray crystallography, solid state, dimer, Magnetic susceptibility, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, unclassified drug, Crystallography, chemistry, magnetism, Ceramics and Composites, room temperature
Abstract

7-(Fur-2-yl)benzotriazinyl 1 is the first example of a hydrazyl radical dimer with a thermally accessible triplet state. The triplet exciton (|D| = 0.018 cm-1, |E| = 0.001 cm-1) was observed by solid-state VT-EPR spectroscopy between 5 and 140 K. VT crystallography, DFT calculations and magnetic susceptibility studies reveal a strong temperature dependence of the intra-dimer exchange interaction with J/k ∼ -254 + 0.0007T2. © 2013 The Royal Society of Chemistry. 49 77 8662 8664 Cited By :22

Published
2013

3. Liquid-crystalline phase behavior in a zwitterionic tetraazapentacene

Author

Riley, A. E., Mitchell, G. W., Koutentis, Panayiotis Andreas, Bendikov, M., Kaszynki, P., Wudl, F., Tolbert, S. H., and Koutentis, Panayiotis Andreas [0000-0002-4652-7567]

Subjects
Materials science, X ray diffraction, Phase composition, Optoelectronic devices, Olefins, law.invention, Biomaterials, chemistry.chemical_compound, Differential scanning calorimetry, Liquid crystal, law, Phase (matter), Electrochemistry, Molecule, Crystallization, Nuclear magnetic resonance spectroscopy, Liquid crystals, High temperature effects, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Crystallography, chemistry, Zwitterion, X-ray crystallography, Switching, Phase behavior
Abstract

A 5,7-dioctadecylquinoxalinophenazine zwitterion 1 has been investigated to determine its thermal phase behavior. A combination of differential scanning calorimetry (DSC), variable temperature low- and high-angle X-ray diffraction (XRD), and deuterium solid-state NMR spectroscopy were used to characterize the different phases of the tetraazapentacene 1. This molecule is found to exist in a variety of crystalline solid phases between room temperature and 167 °C. with different room-temperature phases resulting from crystallization from solution compared with cooling from the melt. Interestingly, the molecule exhibits liquid-crystalline behavior at high temperatures, between 167 °C and 186 °C, above which it becomes an isotropic fluid. The presence of liquid-crystalline behavior in a zwitterionic system opens up the potential for the use of these or related molecules in optoelectronic switching. 13 7 531 540 Cited By :25

Published
2003

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