Synthesis and molecular structures of α-diimines and their zinc and palladium dichloride complexes
作者:David N. Coventry、Andrei S. Batsanov、Andres E. Goeta、Judith A.K. Howard、Todd B. Marder
DOI:10.1016/j.poly.2004.06.023
日期:2004.11
Three alpha-diimines, 2,3-dimethyl-N,N'-bis(cyclohexyl)-diaza- 1,4-butadiene, Cy-DAD (1), (DAD = diaza- 1,4-butadiene), his 12,8(4-methoxyphenylimino)}acenaphthene, p-OMe-BIAN (3), (BIAN = 2,8-bis(arylimino)acenaphthene) and bis2,8-(2,6-di-isopropylphenylimino) acenaphthene, 2,6-'Pr-BIAN (4), were synthesised either via their zinc complexes, as a template, or by the direct reaction of the appropriate primary amine with the diketone. Compound 1 is a non-constrained analogue of the rigid, bidentate nitrogen ligands 3 and 4. Syntheses of the zinc and palladium complexes of 3 and 4, namely 2, 5, 6 and 7, are also reported herein. All compounds have been characterised spectroscopically, and the molecular structures of 1, 3, 4, ZnCl2 (p-OMe-BIAN) (.) 1/2CH(2)Cl(2) (2), PdCl2(p-OMe-BIAN) (6) and PdCl2(2,6-'Pr-BIAN) (7) have been determined by single-crystal X- ray diffraction. Compound I adopts a transoid geometry and possesses a crystallographic inversion centre midway along the N=C-C=N backbone. Compounds 3 and 4 are inherently cisoidal and X-ray analysis highlights a twofold axis through the backbone. The Pd(II) centres of 6 and 7 both adopt square planar geometries whilst 6 contains four molecules per asymmetric unit and 1/2 molecule of benzonitrile per Pd atom and complex 7 is isomorphous with the known structure of PdCl(Me)(2,6-'Pr-BIAN). The Zn complex 2 is pseudo tetrahedral as expected for Zn(II). (C) 2004 Elsevier Ltd. All rights reserved.