Conformation-dependent molecular association and spectral properties of 4-pentyl-4'- cyanobiphenyl liquid crystal in different phases

被引：7

作者：

Bezrodna, T. ^{[1
]}

Nesprava, V. ^{[1
]}

Melnyk, V. ^{[1
]}

Klishevich, G. ^{[1
]}

Curmei, N. ^{[1
]}

Gavrilko, T. ^{[1
]}

Roshchin, O. ^{[1
]}

Baran, J. ^{[2
]}

Drozd, M. ^{[2
]}

机构：

[1] Natl Acad Sci Ukraine, Inst Phys, UA-03028 Kiev, Ukraine

[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50422 Wroclaw, Poland

来源：

LOW TEMPERATURE PHYSICS | 2023年 / 49卷 / 03期

关键词：

liquid crystal; phase transitions; molecular conformation; differential scanning calorimetry; FTIR and photoluminescence spectroscopy; SMECTIC-A PHASES; VIBRATIONAL-SPECTRA; EXCIMER FORMATION; 5CB; DYNAMICS; TRANSITIONS; TRANSFORMATIONS; LUMINESCENCE;

D O I：

10.1063/10.0017240

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The 4-pentyl-4'-cyanobiphenyl (5CB) molecule conformation and structure alignment have been investigated by means of temperature variable Fourier transform infrared (FTIR) and photoluminescence (PL) spectroscopy in a wide temperature range (from -90 to 50 degrees C) covering the 5CB glass-like, metastable and stable crystalline, nematic and isotropic phases defined by differential scanning calorimetry measurements. The corresponding FTIR absorption and PL emission bands reflect a strong dipolar association and a formation of at least two types of 5CB dimeric structures with antiparallel or parallel orientation in the planar configuration. No formation of hydrogen bonds between the cyano groups and hydrogen atoms of the adjacent benzene ring has been found. Besides, a small amount of the 5CB monomer structure has been shown to be present in all phases. The observed temperature-induced changes in the IR and PL spectra can be used as an independent source of experimental information on conformational equilibria and structure alignment of 5CB in different states under the phase transitions.

引用

页码：302 / 309

页数：8

共 40 条

[1]

Abe K, 2005, J KOREAN PHYS SOC, V46, P220

[2] Calculation of the intermolecular energy of large molecules by a fragmentation scheme:: Application to the 4-n-pentyl-4′-cyanobiphenyl (5CB) dimer [J].

Amovilli, C ;

Cacelli, I ;

Campanile, S ;

Prampolini, G .

JOURNAL OF CHEMICAL PHYSICS, 2002, 117 (07) :3003-3012

[3] Structure and conformational mobility of 4-pentyl-4-cyanobiphenyl from IR spectroscopic data [J].

Babkov, LM ;

Gnatyuk, II ;

Puchkovskaya, GA ;

Trukhachev, SV .

JOURNAL OF STRUCTURAL CHEMISTRY, 2002, 43 (06) :1019-1026

[4] Cooling rate effects on luminescence and structure properties of the 5CB liquid crystal, doped by different nanoparticle dispersions [J].

Bezrodna, T. ;

Klishevich, G. ;

Melnyk, V. ;

Nesprava, M. ;

Roshchin, O. ;

Curmei, N. ;

Baran, J. ;

Drozd, M. .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2022, 747 (01) :56-63

[5] Low-temperature luminescence and phase structure of 5CB liquid crystal under different cooling regimes [J].

Bezrodna, T. ;

Klishevich, G. ;

Melnyk, V. ;

Nesprava, V. ;

Roshchin, O. ;

Drozd, M. .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2018, 672 (01) :159-167

[6] Low-temperature photoluminescence of 5CB liquid crystal [J].

Bezrodna, T. ;

Melnyk, V. ;

Vorobjev, V. ;

Puchkovska, G. .

JOURNAL OF LUMINESCENCE, 2010, 130 (07) :1134-1141

[7]

Chaudhary S., 2020, J ATOM MOL CONDENS N, V7, P1, DOI [10.26713/jamcnp.v7i1.1391, DOI 10.26713/JAMCNP.V7I1.1391]

[8] Simulation studies of dipole correlation in the isotropic liquid phase [J].

Cook, MJ ;

Wilson, MR .

LIQUID CRYSTALS, 2000, 27 (12) :1573-1583

[9] SELF-ASSOCIATION OF MONOHYDRIC ALCOHOLS IN WATER - COMPRESSIBILITY AND INFRARED-ABSORPTION MEASUREMENTS [J].

DANGELO, M ;

ONORI, G ;

SANTUCCI, A .

JOURNAL OF CHEMICAL PHYSICS, 1994, 100 (04) :3107-3113

[10] ABSORPTION AND FLUORESCENCE-SPECTRA OF 4-CYANOBIPHENYL AND 4'-ALKYL-SUBSTITUTED OR 4'-ALKOXY-SUBSTITUTED LIQUID-CRYSTALLINE DERIVATIVES [J].

DAVID, C ;

BAEYENSVOLANT, D .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1980, 59 (3-4) :181-196

← 1 2 3 4 →