Induced crystal G phase through intermolecular hydrogen bonding VII. Influence of non-covalent interactions on mesomorphism and crystallization kinetics

M. Srinivasulu, P. V.V. Satyanarayana, P. A. Kumar, V. G.K.M. Pisipati

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

A series of intermolecular hydrogen bonding complexes, 2,2′-bipyridine: p-n-alkoxybenzoic acids (BP: nABA) was isolated from liquid crystalline p-n-alkoxybenzoic acids (nABA) (where n represents alkoxy carbon numbers, 3 to 10 and 12) and a non-mesogen, 2,2′-bipyridine (BP). The thermal and phase behaviour of these complexes was studied by thermal microscopy and differential scanning calorimetry (DSC). These studies revealed the induction of tilted smectic F and crystal G phases. The structural elucidation pertaining to the formation of intermolecular hydrogen bonding was carried out by a detailed IR spectral investigation. Comparative crystallization kinectic studies using DSC, performed on two representative compounds, showed different forms of the crystallization process. The magnitudes of the Avrami exponent n suggests two different mechanisms operate for individual members leading to sporadic three-dimensional growth. Nevertheless, an overall unique mechanism is predicted to operate at each crystallization temperature investigated, while the Avrami constant b shows a temperature dependence suggesting a strong influence of alkoxy terminal groups on the rates of nucleation.

Original languageEnglish
Pages (from-to)1321-1329
Number of pages9
JournalLiquid Crystals
Volume28
Issue number9
DOIs
Publication statusPublished - 12-09-2001

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Crystallization kinetics
Crystallization
Hydrogen bonds
crystallization
Crystals
Differential scanning calorimetry
kinetics
hydrogen
heat measurement
crystals
acids
Acids
scanning
interactions
Phase behavior
induction
Microscopic examination
Nucleation
Carbon
nucleation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Induced crystal G phase through intermolecular hydrogen bonding VII. Influence of non-covalent interactions on mesomorphism and crystallization kinetics",
abstract = "A series of intermolecular hydrogen bonding complexes, 2,2′-bipyridine: p-n-alkoxybenzoic acids (BP: nABA) was isolated from liquid crystalline p-n-alkoxybenzoic acids (nABA) (where n represents alkoxy carbon numbers, 3 to 10 and 12) and a non-mesogen, 2,2′-bipyridine (BP). The thermal and phase behaviour of these complexes was studied by thermal microscopy and differential scanning calorimetry (DSC). These studies revealed the induction of tilted smectic F and crystal G phases. The structural elucidation pertaining to the formation of intermolecular hydrogen bonding was carried out by a detailed IR spectral investigation. Comparative crystallization kinectic studies using DSC, performed on two representative compounds, showed different forms of the crystallization process. The magnitudes of the Avrami exponent n suggests two different mechanisms operate for individual members leading to sporadic three-dimensional growth. Nevertheless, an overall unique mechanism is predicted to operate at each crystallization temperature investigated, while the Avrami constant b shows a temperature dependence suggesting a strong influence of alkoxy terminal groups on the rates of nucleation.",
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Induced crystal G phase through intermolecular hydrogen bonding VII. Influence of non-covalent interactions on mesomorphism and crystallization kinetics. / Srinivasulu, M.; Satyanarayana, P. V.V.; Kumar, P. A.; Pisipati, V. G.K.M.

In: Liquid Crystals, Vol. 28, No. 9, 12.09.2001, p. 1321-1329.

Research output: Contribution to journalArticle

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AU - Kumar, P. A.

AU - Pisipati, V. G.K.M.

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AB - A series of intermolecular hydrogen bonding complexes, 2,2′-bipyridine: p-n-alkoxybenzoic acids (BP: nABA) was isolated from liquid crystalline p-n-alkoxybenzoic acids (nABA) (where n represents alkoxy carbon numbers, 3 to 10 and 12) and a non-mesogen, 2,2′-bipyridine (BP). The thermal and phase behaviour of these complexes was studied by thermal microscopy and differential scanning calorimetry (DSC). These studies revealed the induction of tilted smectic F and crystal G phases. The structural elucidation pertaining to the formation of intermolecular hydrogen bonding was carried out by a detailed IR spectral investigation. Comparative crystallization kinectic studies using DSC, performed on two representative compounds, showed different forms of the crystallization process. The magnitudes of the Avrami exponent n suggests two different mechanisms operate for individual members leading to sporadic three-dimensional growth. Nevertheless, an overall unique mechanism is predicted to operate at each crystallization temperature investigated, while the Avrami constant b shows a temperature dependence suggesting a strong influence of alkoxy terminal groups on the rates of nucleation.

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