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Mindiola DJ, Watson LA, Meyer K, Hillhouse GL. Functionalization of Complexed N 2O in Bis(pentamethylcyclopentadienyl) Systems of Zirconium and Titanium. Organometallics 2014; 33:2760-2769. [PMID: 24954968 PMCID: PMC4059529 DOI: 10.1021/om5002556] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Indexed: 01/19/2023]
Abstract
Methyl triflate reacts with the metastable azoxymetallacyclopentene complex Cp*2Zr(N(O)NCPhCPh), generated in situ from nitrous oxide insertion into the Zr-C bond of Cp*2Zr(η2-PhCCPh) at -78 °C, to afford the salt [Cp*2Zr(N(O)N(Me)CPhCPh)][O3SCF3] (1) in 48% isolated yield. A single-crystal X-ray structure of 1 features a planar azoxymetallacycle with methyl alkylation taking place only at the β-nitrogen position of the former Zr(N(O)NCPhCPh) scaffold. In addition to 1, the methoxy-triflato complex Cp*2Zr(OMe)(O3SCF3) (2) was also isolated from the reaction mixture in 26% yield and fully characterized, including its independent synthesis from the alkylation of Cp*2Zr=O(NC5H5) with MeO3SCF3. Complex 2 could also be observed, spectroscopically, from the thermolysis of 1 (80 °C, 2 days). In contrast to Cp*2Zr(N(O)NPhCCPh), the more stable titanium N2O-inserted analogue, Cp*2Ti(N(O)NCPhCPh), reacts with MeO3SCF3 to afford a 1:1 mixture of regioisomeric salts, [Cp*2Ti(N(O)N(Me)CPhCPh)][O3SCF3] (3) and [Cp*2Ti(N(OMe)NCPhCPh)][O3SCF3] (4), in a combined 65% isolated yield. Single-crystal X-ray diffraction studies of a cocrystal of 3 and 4 show a 1:1 mixture of azoxymetallacyle salts resulting from methyl alkylation at both the β-nitrogen and the β-oxygen of the former Ti(N(O)NCPhCPh ring. As opposed to alkylation reactions, the one-electron reduction of Cp*2Ti(N(O)NCPhCPh) with KC8, followed by encapsulation with the cryptand 2,2,2-Kryptofix, resulted in the isolation of the discrete radical anion [K(2,2,2-Kryptofix)][Cp*2Ti(N(O)NCPhCPh)] (5) in 68% yield. Complex 5 was studied by single-crystal X-ray diffraction, and its solution X-band EPR spectrum suggested a nonbonding σ-type wedge hybrid orbital on titanium, d(z2)/d(x2-y2), houses the unpaired electron, without perturbing the azoxymetallacycle core in Cp*2Ti(N(O)NCPhCPh). Theoretical studies of Ti and the Zr analogue are also presented and discussed.
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Segnorile HH, Zamar RC. Quantum decoherence and quasi-equilibrium in open quantum systems with few degrees of freedom: application to 1H NMR of nematic liquid crystals. J Chem Phys 2011; 135:244509. [PMID: 22225171 DOI: 10.1063/1.3668559] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Explanation of decoherence and quasi-equilibrium in systems with few degrees of freedom demands a deep theoretical analysis that considers the observed system as an open quantum system. In this work, we study the problem of decoherence of an observed system of quantum interacting particles, coupled to a quantum lattice. Our strategy is based on treating the environment and the system-environment Hamiltonians fully quantum mechanically, which yields a representation of the time evolution operator useful for disentangling the different time scales underlying in the observed system dynamics. To describe the possible different stages of the dynamics of the observed system, we introduce quantum mechanical definitions of essentially isolated, essentially adiabatic, and thermal-contact system-environment interactions. This general approach is then applied to the study of decoherence and quasi-equilibrium in proton nuclear magnetic resonance ((1)H NMR) of nematic liquid crystals. A summary of the original results of this work is as follows. We calculate the decoherence function and apply it to describe the evolution of a coherent spin state, induced by the coupling with the molecular environment, in absence of spin-lattice relaxation. By assuming quantum energy conserving or non-demolition interactions, we identify an intermediate time scale, between those controlled by self-interactions and thermalization, where coherence decays irreversibly. This treatment is also adequate for explaining the buildup of quasi-equilibrium of the proton spin system, via the process we called eigen-selectivity. By analyzing a hypothetical time reversal experiment, we identify two sources of coherence loss which are of a very different nature and give rise to distinct time scales of the spin dynamics: (a) reversible or adiabatic quantum decoherence and (b) irreversible or essentially adiabatic quantum decoherence. Local irreversibility arises as a consequence of the uncertainty introduced by the coupling with an infinite quantum environment. The reversible part can be represented by a semiclassical model, similar to standard line-shape adiabatic models. By exploiting the separation existing between the time scales of the spin coherences and the irreversible decoherence, we present a novel technique to obtain the orientational molecular distribution function for a nematic liquid crystal. The procedure is based on the comparison of the observed coherence time evolution and numerical calculation under the adiabatic quantum decoherence approach. As an example, it is used the experimental free induction decay from a nematic PAA(d6) sample to extract such an orientational distribution. This is the first theoretical description of the experimental liquid crystal NMR signal in the time domain. On the contrary, the irreversible decoherence is intrinsically full-quantum mechanical, as it is governed by the commutation properties of the environment and the spin-lattice Hamiltonians. Consistently, it depends on the molecular correlation in a decisive way, since it vanishes under a mean-field model for the molecular dynamics. The results of this work can contribute to the understanding of the open question of the applicability of the spin-temperature concept in spin systems with few degrees of freedom.
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Affiliation(s)
- Héctor H Segnorile
- Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, Córdoba, Argentina.
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Fu-Jiang D, Liang-Fu Z, Tian-Zhi W, Li-Kui J. Ab initio study of sphere-like mesogen properties. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.19990170605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Crystal structure of mesogenic material – 4′-n-pentyl cyclohexyl-(4-n-pentyl cyclohexane)-1-carboxylate. Z KRIST-CRYST MATER 2010. [DOI: 10.1524/zkri.1993.208.part-1.49] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The compound C23O2H42 crystallizes in the triclinic space group P1 with a = 5.5478(2) Å, b = 9.7768(3) Å, c = 10.6846(2) Å, α = 96.428(3)°, β = 94.161(4)°, τ = 103.807(3)° and one molecule per unit cell. D
calc = 1.047 Mg · m−3. The structure was solved by direct methods (SOLVER-NRCVAX1) using 1611 observed reflections [I > 2σ(I)]. It was refined by block-diagonal and full-matrix least-squares method to a final R of 0.078. The molecule is almost stretched and linear. The angle between the mean planes of the cyclohexane rings is 3.87(2)°. The packing of the molecules exhibits a strong layering as required for a smectic liquid crystalline phase – the cyclohexane groups forming one line with the extended alkyl chains penetrating into the neighbouring layers.
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Franklin S, Balasubramanian T, Padmini V, Sulochana N. Crystal structure and optical properties of 4-nitrophenyl 4-butoxybenzoate. CRYSTAL RESEARCH AND TECHNOLOGY 2008. [DOI: 10.1002/crat.200800133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Janbon S, Davey RJ, Shankland K. The crystal structure of a metastable polymorph of para-azoxyanisole. CrystEngComm 2008. [DOI: 10.1039/b715934j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Emsley J, Khoo S, Luckhurst G. Determination of orientational order parameters for nematics by deuterium nuclear magnetic resonance. The influence of internal rotation. Mol Phys 2006. [DOI: 10.1080/00268977900103311] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- J.W. Emsley
- a Department of Chemistry , The University , Southampton , SO9 5NH , England
| | - S.K. Khoo
- a Department of Chemistry , The University , Southampton , SO9 5NH , England
- b Department of Chemistry , Jabatan Kimia University of Malaya , Kuala Lumpur , 22-11 , Malaysia
| | - G.R. Luckhurst
- a Department of Chemistry , The University , Southampton , SO9 5NH , England
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Diehl P, Tracey A. Order in pure nematic liquid crystals as determined by N.M.R. of partially deuterated species. Mol Phys 2006. [DOI: 10.1080/00268977500103391] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ejsmont K, Domański AA, Kyzioł JB, Zaleski J. Disorder in the crystals of trans-4-fluoroazoxybenzene. Synthesis, spectral properties, crystal structures and DFT calculations. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2005.05.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Seliger J, Žagar V. 14N nuclear quadrupole resonance in solid 4,4′-azoxyanisole and 4,4′-bis(heptyloxy)azoxybenzene. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2004.07.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Oberhänsli WE. Die Kristallstruktur von 2,4-Diamino-5-(3,4,5-trimethoxybenzyl)-pyrimidin-1-oxid-dihydrat. (Ein Metabolit von Trimethoprim). Helv Chim Acta 2004. [DOI: 10.1002/hlca.19700530727] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ogorodnik KZ. Four solid-crystal forms of paraazoxyanisole and the thermodynamic relationships between them. CRYSTALLOGR REP+ 2002. [DOI: 10.1134/1.1523542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Crystal Structures of LC Mesogens. STRUCTURE AND BONDING 2001. [DOI: 10.1007/3-540-68305-4_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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Brauer DJ, Bürger H, Chebude Y, Pawelke G. Electrochemical and Ozone Oxidation of (CF3)3B · NH3: Formation and Characterization of Products with Nondegradated (CF3)3B Groups. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(19990202)1999:2<247::aid-ejic247>3.0.co;2-b] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Affiliation(s)
- Y. Shao
- Physics Department, TCU Box 298840, Fort Worth, Texas 76129
| | - T. W. Zerda
- Physics Department, TCU Box 298840, Fort Worth, Texas 76129
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Kuze N, Ebizuka M, Fujiwara H, Takeuchi H, Egawa T, Konaka S, Fogarasi G. Molecular Structure of p-Azoxyanisole, a Mesogen, Determined by Gas-Phase Electron Diffraction Augmented by ab Initio Calculations. J Phys Chem A 1998. [DOI: 10.1021/jp980321l] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nobuhiko Kuze
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Motoi Ebizuka
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Hideo Fujiwara
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Hiroshi Takeuchi
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Toru Egawa
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Shigehiro Konaka
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Geza Fogarasi
- Department of Theoretical Chemistry, Eötvös University, Budapest H-1518, Hungary
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Hamley IW, Garnett S, Luckhurst GR, Roskilly SJ, Sedon JM, Pedersen JS, Richardson RM. Orientational ordering in the nematic phase of a thermotropic liquid crystal: A small angle neutron scattering study. J Chem Phys 1996. [DOI: 10.1063/1.471759] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Armentano S, De Munno G, Ghedini M, Morrone S. Cyclopalladated p-azoxyanisole complexes. Synthesis and structure of {[bis(2-phenylpyridine)]- [4′-(methoxyphenyl-NNO-azoxy-N2)-4-methoxyphenyl-2-ato]palladium(II)}(tetrafluoroborate). Inorganica Chim Acta 1994. [DOI: 10.1016/0020-1693(94)03807-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Averyanov EM. Steric effect of terminal substituents in azomethins and thermal stability of the nematic phase. J STRUCT CHEM+ 1994. [DOI: 10.1007/bf00753527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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2,3-dimethoxyperhydro-1,4,2,3-dioxadiazine: Synthesis, conformation, and conversion to 1-(2-hydroxyethoxy)-2-methoxydiazene-1-oxide. Crystal structure of 1-[2-(para-nitrobenzoyloxy)-ethoxy]-2-methoxydiazene-1-oxide. Russ Chem Bull 1992. [DOI: 10.1007/bf00863376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Date R, Hamley I, Luckhurst G, Seddon J, Richardson R. Orientational ordering in liquid crystals: isotope labelling neutron diffraction experiments. Mol Phys 1992. [DOI: 10.1080/00268979200101781] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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24
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Di Bari L, Persico M, Veracini CA. Coupled internal rotations in substituted ethoxybenzenes: Maximum entropy analysis of nuclear magnetic resonance of nematic solutions data andabinitiorotameric distributions. J Chem Phys 1992. [DOI: 10.1063/1.462764] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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25
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Hamley I, Luckhurst G, Seddon J. The influence of molecular biaxiality on intramolecular X-ray and neutron scattering from uniaxial nematic liquid crystals. Mol Phys 1991. [DOI: 10.1080/00268979100102921] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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26
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Ghedini M, Morrone S, De Munno G, Crispini A. Transition metals complexed to ordered mesophases. J Organomet Chem 1991. [DOI: 10.1016/0022-328x(91)80126-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sawada M, Takai Y, Tanaka T, Hanafusa T, Okubo M, Tsuno Y. Substituent Effects on 15N and 17O NMR Chemical Shifts in 4′-Substituted trans- NNO-Azoxybenzenes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1990. [DOI: 10.1246/bcsj.63.702] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Volino F, Galland D, Ferreiras J, Dianoux A. Contribution to the study of the structure of a complex non rigid molecule in the liquid phase : Case of nematic para-azoxyanisole. J Mol Liq 1989. [DOI: 10.1016/0167-7322(89)80016-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Limmer S. Physical Principles Underlying the Experimental Methods for Studying the Orientational Order of Liquid Crystals. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/prop.2190371202] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Flüssigkristalle. ACTA ACUST UNITED AC 1989. [DOI: 10.1007/978-3-663-11771-1_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Tsutsumi T, Okubo M, Yasuoka N, Katsube Y. Azoxy- and Azoferrocenes, andN-(Ferrocenylarylmethylene)anilines Formed via Aryliminodimagnesium(IDMg) Procedure. Effect of Ferrocenyl Group on IDMg Reaction and Molecular Structures of Products. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1988. [DOI: 10.1246/bcsj.61.237] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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32
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Banks RE, Farhat IM, Fields R, Pritchard RG, Saleh MM. N-halogeno-compounds. Part 9 [1]. Azoxy- and azo-arenes derived from 4-(dichloroamino)tetrafluoropyridine; crystal structure of trans-2,3,5,6-tetrafluoro-4-(2,4,6-trimethylphenyl-onn-azoxy)pyridine. J Fluor Chem 1985. [DOI: 10.1016/s0022-1139(00)80544-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Konstantinov I, Sitnov A, Grebneva V, Amerik Y. The effect of chemical constitution of mesogenic monomer unit on liquid crystalline properties of polymers. Eur Polym J 1983. [DOI: 10.1016/0014-3057(83)90168-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hoesch L, Bieri JH, Declercq JP, Germain G, Van Meerssche M. Crystal Structure of (Z)-1-Phenyl- and of (Z)-1-Dimethylamino-2-phthalimido-diazene-1-oxide. Helv Chim Acta 1981. [DOI: 10.1002/hlca.19810640327] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Follner H. On crystal chemistry and morphology of extended organic molecules. CRYSTAL RESEARCH AND TECHNOLOGY 1981. [DOI: 10.1002/crat.19810161102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Kubota T, Miyazaki H, Yamakawa M, Ezumi K, Yamamoto Y. The Electronic Spectra and Nonaqueous Oxidation and Reduction Potentials of Azoxybenzenes, and Their Mutual Correlation. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1979. [DOI: 10.1246/bcsj.52.1588] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kashino S, Ito K, Haisa M. The Crystal and Molecular Structure of Benzanilide. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1979. [DOI: 10.1246/bcsj.52.365] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hayamizu K, Yamamoto O. Proton NMR Spectra of Selectively Deuteratedp,p′-Azoxyanisoles in the Solid State. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1979. [DOI: 10.1246/bcsj.52.25] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Venugopalan S, Prasad SN. Submillimeter wave absorption in a homologous series of liquid crystals. J Chem Phys 1979. [DOI: 10.1063/1.438342] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Crystal structures of nematogenic p-ethoxy- and p-propoxysalicylidene-p?-butylanilines. J STRUCT CHEM+ 1979. [DOI: 10.1007/bf00746293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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45
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Lemke G. Crystallographic investigation of single crystals of the mesogen compound 4′-nitrophenyl-4-n-octyloxybenzoate. CRYSTAL RESEARCH AND TECHNOLOGY 1979. [DOI: 10.1002/crat.19790140210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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46
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Dowell F, Martire DE. Lattice model studies of the effect of chain flexibility on the nematic–isotropic transition. II. Rigid cores having semiflexible tails. J Chem Phys 1978. [DOI: 10.1063/1.435787] [Citation(s) in RCA: 40] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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de Jeu WH, Bordewijk P. Physical studies of nematic azoxybenzenes. II. Refractive indices and the internal field. J Chem Phys 1978. [DOI: 10.1063/1.435499] [Citation(s) in RCA: 106] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Azoulay M, Wettermark G. Kinetics of the dissociation and cis-trans isomerization of o,o'-azodioxytoluene (dimeric o-nitrosotoluene). Tetrahedron 1978. [DOI: 10.1016/0040-4020(78)88392-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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50
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de Jeu WH, Claassen WAP. Physical studies of nematic azoxybenzenes. I. Magnetic susceptibilities and the order parameter. J Chem Phys 1978. [DOI: 10.1063/1.435498] [Citation(s) in RCA: 79] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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