메뉴 건너뛰기




Volumn 45, Issue 28, 2006, Pages 4619-4624

Electric-field modulation of component exchange in constitutional dynamic liquid crystals

Author keywords

Dynamic combinatorial chemistry; Electrochemistry; Imines; Liquid crystals; Phase transitions

Indexed keywords

ANISOTROPY; ELECTRIC FIELD EFFECTS; ELECTROCHEMISTRY; ORGANIC COMPOUNDS; PHASE EQUILIBRIA; PHASE TRANSITIONS;

EID: 33746305330     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200600430     Document Type: Article
Times cited : (78)

References (45)
  • 6
    • 0037192455 scopus 로고    scopus 로고
    • b) J.-M. Lehn, Science 2002, 295, 2400.
    • (2002) Science , vol.295 , pp. 2400
    • Lehn, J.-M.1
  • 15
    • 0036809602 scopus 로고    scopus 로고
    • and references therein
    • J.-M. Lehn, Polym. Int. 2002, 51, 825, and references therein.
    • (2002) Polym. Int. , vol.51 , pp. 825
    • Lehn, J.-M.1
  • 16
    • 0000539806 scopus 로고    scopus 로고
    • For a recent review on the use of liquid crystals for display technology, see: P. Kirsch, M. Bremer, Angew. Chem. 2000, 112, 4384;
    • (2000) Angew. Chem. , vol.112 , pp. 4384
    • Kirsch, P.1    Bremer, M.2
  • 26
    • 33746304912 scopus 로고    scopus 로고
    • note
    • 1/N values of the mixtures; however, the use of mixtures of LCs as dynamic systems, has not been explored;
  • 28
    • 17644404350 scopus 로고    scopus 로고
    • and references therein
    • The choice of transimination as the exchange reaction is of crucial importance to avoid the presence of water (that would be formed in amine-carbonyl condensations) in the present systems so as to maintain high resistance to the electric current upon application of a high voltage. For catalyzed and noncatalyzed transimination reactions, see: N. Giuseppone, J.-L. Schmitt, E. Schwartz, J.-M. Lehn, J. Am. Chem. Soc. 2005, 127, 5528, and references therein.
    • (2005) J. Am. Chem. Soc. , vol.127 , pp. 5528
    • Giuseppone, N.1    Schmitt, J.-L.2    Schwartz, E.3    Lehn, J.-M.4
  • 29
    • 33746296065 scopus 로고    scopus 로고
    • note
    • a) Under these conditions the heating appeared negligible (ca. 1°C measured at the surface of the ITO plates),
  • 30
    • 0014929657 scopus 로고
    • in agreement with literature results: b) W. Helfrich, Phys. Rev. Lett. 1970, 24, 201;
    • (1970) Phys. Rev. Lett. , vol.24 , pp. 201
    • Helfrich, W.1
  • 33
    • 33746303445 scopus 로고    scopus 로고
    • note
    • 1/2 = 30 min at 30°C, which is also suitable for NMR measurements.
  • 34
    • 33746293405 scopus 로고    scopus 로고
    • note
    • The change in the direction of the displacement of the equilibrium above 30°C (Figure 3 B, right-hand part of the curve) was found to arise from evaporation of cyclopentylamine. Thus, the effect of heating on the equilibrium is in the opposite direction (left-hand part of the curve, Figure 3 B) than that caused by the field before evaporation takes over.
  • 35
    • 33746283806 scopus 로고    scopus 로고
    • note
    • -1, after 18 h at 23°C. Moreover, if MBBA is replaced by pentaethylene glycol (with no liquid-crystal properties and similar viscosity), no differential evaporation was observed.
  • 36
    • 0031379423 scopus 로고    scopus 로고
    • The effect amounts to a sort of purification under high voltage; for electrohydrodynamic effects in the MBBA-type nematic phases, see: D. Jin, H. Kim, S. H. Kim, S. K. Kim, J. Phys. Chem. B 1997, 101, 10757.
    • (1997) J. Phys. Chem. B , vol.101 , pp. 10757
    • Jin, D.1    Kim, H.2    Kim, S.H.3    Kim, S.K.4
  • 37
    • 33746314976 scopus 로고    scopus 로고
    • note
    • The coexistence between liquid-crystalline and liquid domains is observed between the ITO plates.
  • 39
    • 4544352396 scopus 로고    scopus 로고
    • For a theoretical study of the effect of an external electric field on bond activation reactions, see: S. Shaik, S. P. de Visser, D. Kumar, J. Am. Chem. Soc. 2004, 126, 11746.
    • (2004) J. Am. Chem. Soc. , vol.126 , pp. 11746
    • Shaik, S.1    De Visser, S.P.2    Kumar, D.3
  • 40
    • 33746287913 scopus 로고    scopus 로고
    • note
    • [26] the contribution of the field heterogeneity related to the motions of ionic particles throughout the sample could be more than enough to displace the equilibrium with the experimentally measured values of the conductivity. Ionic motions and the conceivable accumulation of charges on the electrode surfaces would lead to high local field values, capable of sufficient interaction with the liquid crystal to result in its amplification from the DCL.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.