期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 690, 期 4, 页码 998-1010出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2004.11.010
关键词
metallomesogens; palladium; orthometalated imine; polyether; substituent effect; liquid crystals
A series of benzylideneanilines bearing terminal polyether chains, HL (HL=R-C6H4-CH=N-C6H4-R': R=OC8H17, R'=O(CH2CH2O)(2)C2H5; R=O(CH2CH2O)(2)C2H5, R'=OC8H17; R=R'=O(CH2CH2O)(2)C2H5: R=OC12H25, R'= O(CH2CH2O)(3)C2H5; R=O(CH2CH2O)(3)C2H5, R' = OC12H25; R = R' = O(CH2CH2O)(3)C2H5) have been prepared. Their dinuclear. [Pd(mu-X)L](2) (X = OAc, Cl, Br, SC8), [Pd-2(mu-SCn)(mu-X)L-2] (X = OAc, Cl; n = 8, 2) and mononuclear orthopalladated derivatives. Pd(acac)L, Pd(Ala)L, are reported and their mesogenic properties are compared with those of the analogous compounds with alkoxy chains. In general a great lowering in the melting points is produced for all the products. The free ligands and the alanine complexes are not liquid crystals. The chloro-bridged complexes bearing alkoxy and short polyether chains (O(CH2CH2O)(2)C2H5) Show the larger improvement of mesogenic properties. Longer polyether chains (O(CH2CH2O)C2H5) result usually in a destabilization of the mesophases. If only polyether chains are present, the destabilization is important regardless of the chain length. The ability of these molecules as ionic extractants and transporters was qualitatively evaluated for the more propitious cis-dinuclear complexes. which in fact showed some extracting ability, modest but improved compared to the free ligands. (C) 2004 Elsevier B.V. All rights reserved.
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