Liquid crystalline cyclic tetramethyltetrasiloxanes containing coumarin moieties

Yanqing Tian, Eiichi Akiyama, Yu Nagase

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A series of new cyclic tetramethyltetrasiloxanes with coumarin units were synthesized. By a comparative study with their related vinyl terminated precursors, the liquid crystalline properties of the cyclic tetramethyltetrasiloxanes were investigated. The results show that the thermal properties of the cyclic tetramethyltetrasiloxanes are stabilised through their increasing clearing temperatures and broadening mesophases. The thermal properties of the cyclic tetramethyltetrasiloxanes show that introduction of a tail group at the 3 position of the coumarin unit increases the thermal stability of the liquid crystalline order. Increasing the length of the tail group causes the clearing temperatures of the cyclic tetramethyltetrasiloxanes to decrease. The photochemical behavior of spin-coated films of the cyclic tetramethyltetrasiloxanes indicates the photo-crosslinking of the coumarin units in the thin films.

Original languageEnglish (US)
Pages (from-to)1253-1258
Number of pages6
JournalJournal of Materials Chemistry
Volume13
Issue number6
DOIs
StatePublished - Jun 1 2003
Externally publishedYes

Fingerprint

clearing
Thermodynamic properties
thermodynamic properties
Crystalline materials
Liquids
crosslinking
liquids
Crosslinking
Thermodynamic stability
thermal stability
Thin films
Temperature
temperature
causes
thin films
coumarin

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Liquid crystalline cyclic tetramethyltetrasiloxanes containing coumarin moieties. / Tian, Yanqing; Akiyama, Eiichi; Nagase, Yu.

In: Journal of Materials Chemistry, Vol. 13, No. 6, 01.06.2003, p. 1253-1258.

Research output: Contribution to journalArticle

Tian, Yanqing ; Akiyama, Eiichi ; Nagase, Yu. / Liquid crystalline cyclic tetramethyltetrasiloxanes containing coumarin moieties. In: Journal of Materials Chemistry. 2003 ; Vol. 13, No. 6. pp. 1253-1258.
@article{7c7ba7aa97824400882e2ec4b1b0ae24,
title = "Liquid crystalline cyclic tetramethyltetrasiloxanes containing coumarin moieties",
abstract = "A series of new cyclic tetramethyltetrasiloxanes with coumarin units were synthesized. By a comparative study with their related vinyl terminated precursors, the liquid crystalline properties of the cyclic tetramethyltetrasiloxanes were investigated. The results show that the thermal properties of the cyclic tetramethyltetrasiloxanes are stabilised through their increasing clearing temperatures and broadening mesophases. The thermal properties of the cyclic tetramethyltetrasiloxanes show that introduction of a tail group at the 3 position of the coumarin unit increases the thermal stability of the liquid crystalline order. Increasing the length of the tail group causes the clearing temperatures of the cyclic tetramethyltetrasiloxanes to decrease. The photochemical behavior of spin-coated films of the cyclic tetramethyltetrasiloxanes indicates the photo-crosslinking of the coumarin units in the thin films.",
author = "Yanqing Tian and Eiichi Akiyama and Yu Nagase",
year = "2003",
month = "6",
day = "1",
doi = "10.1039/b302857g",
language = "English (US)",
volume = "13",
pages = "1253--1258",
journal = "Journal of Materials Chemistry",
issn = "0959-9428",
publisher = "Royal Society of Chemistry",
number = "6",

}

TY - JOUR

T1 - Liquid crystalline cyclic tetramethyltetrasiloxanes containing coumarin moieties

AU - Tian, Yanqing

AU - Akiyama, Eiichi

AU - Nagase, Yu

PY - 2003/6/1

Y1 - 2003/6/1

N2 - A series of new cyclic tetramethyltetrasiloxanes with coumarin units were synthesized. By a comparative study with their related vinyl terminated precursors, the liquid crystalline properties of the cyclic tetramethyltetrasiloxanes were investigated. The results show that the thermal properties of the cyclic tetramethyltetrasiloxanes are stabilised through their increasing clearing temperatures and broadening mesophases. The thermal properties of the cyclic tetramethyltetrasiloxanes show that introduction of a tail group at the 3 position of the coumarin unit increases the thermal stability of the liquid crystalline order. Increasing the length of the tail group causes the clearing temperatures of the cyclic tetramethyltetrasiloxanes to decrease. The photochemical behavior of spin-coated films of the cyclic tetramethyltetrasiloxanes indicates the photo-crosslinking of the coumarin units in the thin films.

AB - A series of new cyclic tetramethyltetrasiloxanes with coumarin units were synthesized. By a comparative study with their related vinyl terminated precursors, the liquid crystalline properties of the cyclic tetramethyltetrasiloxanes were investigated. The results show that the thermal properties of the cyclic tetramethyltetrasiloxanes are stabilised through their increasing clearing temperatures and broadening mesophases. The thermal properties of the cyclic tetramethyltetrasiloxanes show that introduction of a tail group at the 3 position of the coumarin unit increases the thermal stability of the liquid crystalline order. Increasing the length of the tail group causes the clearing temperatures of the cyclic tetramethyltetrasiloxanes to decrease. The photochemical behavior of spin-coated films of the cyclic tetramethyltetrasiloxanes indicates the photo-crosslinking of the coumarin units in the thin films.

UR - http://www.scopus.com/inward/record.url?scp=0038454675&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038454675&partnerID=8YFLogxK

U2 - 10.1039/b302857g

DO - 10.1039/b302857g

M3 - Article

VL - 13

SP - 1253

EP - 1258

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

SN - 0959-9428

IS - 6

ER -