Mesomorphism dependence on central bridges and the efficiency order of the tail group

Bhola, G.N.; Bhoya, U. C.

doi:10.1080/15421406.2016.1146937

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…Homologous series-1 of present investigation and a homologous series-X [30] selected for comparative study are identical with respect to three phenyl rings and a central bridge -CH=CH-COO-linking first and middle phenyl ring which partly contributes to the total molecular rigidity and the left n-alkoxy terminal end group -OR is identically similar for the same homologue from series to series which partly contributes to total molecular flexibility. However, they differ with respect to central bridges -CO-CH=CH-and -CH=N-linking middle and third phenyl rings, including tail end group -N-(CH 3 ) 2 and 2, 5-di methyl group in which two methyl groups are bonded directly to Nitrogen atom in present novel series-1 and two methyl groups bonded to nitrogen atom through third phenyl ring in case of series-X.…”

Section: Figure-2: Structurally Similar Seriesmentioning

confidence: 98%

Study of the Effect of Chalconyl Central Bridge on Mesomorphism

Rakhasia

Bhola

Bhoya

2015

ILCPA

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A novel homologous series of chalconyl ester derivatives of thermotropic type of liquid crystals (LC) variety have been synthesized with its general molecular formula RO-C6H4-CH=CH-COO-C6H4-CO-CH=CH-C6H4-N(CH3)2 (Para). Present investigation is planned with a view to understand and establish the relation between molecular structure and the mesomorphic behaviorur of the constituent homologue derivatives as well as to avail novel mesomorphic (LC) substances to the researcher working on multidisciplinary thermotropic LC material with different aims, objects and views at different angles. Novel homologous series consists of twelve homologues C1 to C5 homologues are nonliquid crystals (NLC) and the rest of the C6 to C16 are monotropically nematogenic liquid crystals. Transition temperatures and texture of the LC and NLC were determined by an optical polarizing microscopy equipped with heating stage (POM). Textures of nematic phase are threaded or schlieren. Analytical and spectral data confirms the molecular structures of homologues. Thermal stability for monotropy is very low of the magnitudes of few second and of negligible degree of temperature difference. Thermal properties of present novel series are compared with of structurally similar series, data interpreted in terms of molecular rigidity and flexibility to derive group efficiency order.

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Section: Figure-2: Structurally Similar Seriesmentioning

confidence: 98%

Study of the Effect of Chalconyl Central Bridge on Mesomorphism

Rakhasia

Bhola

Bhoya

2015

ILCPA

View full text Add to dashboard Cite

show abstract

“…Some LC properties of present novel series are compared with structurally similar homologous series as mentioned below in figure-2. Homologous series-1 of present investigation and a homologous series-X [30] selected for comparative study are identical with respect to three phenyl rings and a central bridge -CH=CH-COO-linking first and middle phenyl ring which partly contributes to the total molecular rigidity and the left n-alkoxy terminal end group -OR is identically similar for the same homologue from series to series which partly contributes to total molecular flexibility. However, they differ with respect to central bridges -CO-CH=CH-and -CH=N-linking middle and third phenyl rings, including tail end group -N-(CH 3 ) 2 and 2, 5-di methyl group in which two methyl groups are bonded directly to Nitrogen atom in present novel series-1 and two methyl groups bonded to nitrogen atom through third phenyl ring in case of series-X.…”

mentioning

confidence: 98%

Study of the Effect of Chalconyl Central Bridge on Mesomorphism

Rakhasia

Bhola

Bhoya

2015

ILCPA

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ABSTRACT.A novel homologous series of chalconyl ester derivatives of thermotropic type of liquid crystals (LC) variety have been synthesized with its general molecular formula RO-C 6 H 4 -CH=CH-COO-C 6 H 4 -CO-CH=CH-C 6 H 4 -N(CH 3 ) 2 (Para). Present investigation is planned with a view to understand and establish the relation between molecular structure and the mesomorphic behaviorur of the constituent homologue derivatives as well as to avail novel mesomorphic (LC) substances to the researcher working on multidisciplinary thermotropic LC material with different aims, objects and views at different angles. Novel homologous series consists of twelve homologues C 1 to C 5 homologues are nonliquid crystals (NLC) and the rest of the C 6 to C 16 are monotropically nematogenic liquid crystals. Transition temperatures and texture of the LC and NLC were determined by an optical polarizing microscopy equipped with heating stage (POM). Textures of nematic phase are threaded or schlieren. Analytical and spectral data confirms the molecular structures of homologues. Thermal stability for monotropy is very low of the magnitudes of few second and of negligible degree of temperature difference. Thermal properties of present novel series are compared with of structurally similar series, data interpreted in terms of molecular rigidity and flexibility to derive group efficiency order.

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