Intra- and intermolecular interactions in mesogenic cyano compounds

Literature Information

Publication Date 2000-06-05
DOI 10.1039/B000567N
Impact Factor 3.676
Authors

Kayako Hori, Miki Kuribayashi, Mizue Iimuro


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Abstract

In order to elucidate the intra- and intermolecular interactions, FTIR spectra were measured on dilute solutions of CCl4 (0.01 mol l−1) and bulk states from crystals to isotropic liquids for mesogenic 4-cyano-4′-alkylbiphenyls (nCB), 4-cyano-4′-alkoxybiphenyls (nOCB), 4-cyanophenyl 4-alkoxybenzoates (CPnOB), and 4-alkoxyphenyl 4-cyanobenzoates (nOPCB) series. CN stretching vibration frequencies in dilute solutions are slightly but definitely different—0.5 cm−1 higher for nCB than for nOCB and 0.8 cm−1 higher for nOPCB than for CPnOB—giving a direct evidence of the different intramolecular interaction of molecules. The frequency difference in mesophases is larger than that of molecules in solutions, 1.0 and 1.5 cm−1 for cyanobiphenyls and cyanoesters, respectively. The difference is related to the different extents of molecules overlapping, leading to the conclusion that the larger electron densities of CN groups in nOCB and CPnOB led to the larger overlapping of core moieties. A relationship between the wavenumbers and arrangements of CN groups in crystals is pointed out.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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