Two polymorphs Ni(II) complexes containing the dicyanamide ligand:: syntheses, structures and magnetic properties of {[Ni(meso-CTH)(μ1,5-dca)]ClO4}n and [Ni(meso-CTH)] [Ni(meso-CTH)(dca)2](ClO4)2 (dca = dicyanamide; CTH = meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraaza cyclotetradecane)

被引：25

作者：

Colacio, E ^{[1
]}

Maimoun, IB

Kivekäs, R

Sillanpää, R

Suárez-Varela, J

机构：

[1] Univ Granada, Fac Ciencias, Dept Quim Inorgan, E-18071 Granada, Spain

[2] Univ Helsinki, Dept Chem, Inorgan Chem Lab, FIN-00014 Helsinki, Finland

[3] Univ Jyvaskyla, Dept Chem, FIN-40351 Jyvaskyla, Finland

来源：

INORGANICA CHIMICA ACTA | 2004年 / 357卷 / 05期

关键词：

polymorphs; one-dimensional; ferromagnetic; dicyanamide; nickel(II); complexes;

D O I：

10.1016/j.ica.2003.12.038

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Two polymorphs Ni(II) complexes {[Ni(meso-CTH)(mu(1.5)-dca)]ClO4}(n) (1) and [Ni(meso-CTH)][Ni(meso-CTH)(dca)(2)](ClO4)(2) (2) have been obtained in the same synthesis from dicyanamide (dca) and [Ni(meso-CTH)](ClO4)(2) and have been characterized by X-ray crystallography and magnetic measurements. Complex I is a ID cationic polymeric zig-zag chain with single end-to-end dca bridges connecting Ni(II) ions in trans positions, whereas in Compound 2 coexist two different types of Ni(H) mononuclear units. cationic square-planar and neutral octahedral. Variable-temperature magnetic measurements reveal weak ferromagnetic interactions across the single end-to-end dca bridges in 1. while for 2 the magnetic behaviour agrees with that expected for isolated octahedral Ni(II) ions with a significant zero-field splitting. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1465 / 1470

页数：6

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