Metallomesogens derived from benzoxazoles-salicylaldimine conjugates

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50905

Title:	Metallomesogens derived from benzoxazoles-salicylaldimine conjugates
Authors:	Chen,CJ;Wang,IW;Sheu,HS;Lee,GH;Lai,CK
Contributors:	化學學系
Keywords:	LIQUID-CRYSTALLINE PROPERTIES;MESOMORPHIC PROPERTIES;HETEROCYCLIC BENZOXAZOLES;SCHIFF-BASES;COMPLEXES;LIGANDS;CORE;BIMETALLOMESOGENS;BENZOTHIAZOLE;LUMINESCENCE
Date:	2011
Issue Date:	2012-03-27 18:12:37 (UTC+8)
Publisher:	國立中央大學
Abstract:	The synthesis, characterization, and mesomorphic properties of a new series of Schiff bases 2a-h and metal complexes 1a-h-M are prepared and their mesomorphic properties studied. Two single crystallographic structures of 2d (n=12, m=1) and 1g-Pd (n=m=12) were determined by X-ray analysis. Both compounds crystallize in a triclinic space group P-1. A dimeric structure formed by intermolecular H-bonds in 2d was observed, giving nematic phase due to a better aspect ratio. The central geometry at Pd(2+) ion is nearly perfect square plane. All Schiff bases 2a-h formed N or/and SmC phases. The formation of mesophases of complexes 1a-h-M was strongly dependent on metal ions incorporated. All Cu(2+), Ni(2+) and Pd(2+) complexes exhibited N or/and SmC phase, respectively. However. Zn(2+) and Co(2+) complexes were not mesogenic. The lack of mesomorphism was probably attributed to a preferred tetrahedral geometry at Zn(2+) and Co(2+) over a square-planar geometry at Cu(2+) and Pd(2+). (C) 2011 Elsevier Ltd. All rights reserved.
Relation:	TETRAHEDRON
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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