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Issue 10, 2001
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1-D Structures of assemblies containing oxamidato dicopper building blocks controlled by ditopic N-donor spacers

Hua-Xin Zhang,a  Bei-Sheng Kang,*a  Zhong-Yuan Zhou,b  Albert S. C. Chan,b  Zhong-Ning Chena  and  Chen Rena 
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* Corresponding authors

a School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou, Guangdong, China
E-mail: ceslhq@zsu.edu.cn
Fax: +86-20-84110318

b Open Laboratory of Chirotechnology, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China

Abstract

The assembly of the ditopic N-donor ligands bpy, bpe or dapm and the building block [Cu(trans-oxpy)Cu]2+ (H2oxpy = N,N′-bis(2-pyridylmethyl)oxamide) gave rise to three 1-D coordination polymers [Cu2(trans-oxpy)(bpy)(H2O)2]n[NO3]2n·nH2O (bpy = 4,4′-bipyridine) 1, [Cu2(trans-oxpy)(bpe)(H2O)2]n[NO3]2n·3nH2O (bpe = 1,2-di-4-pyridylethylene) 2 and [Cu2(trans-oxpy)(dapm)2]n[NO3]2n·6nH2O (dapm = 4,4′-diaminodiphenylmethane) 3 and their structures were determined by single crystal X-ray crystallography. The copper atoms, which are located in distorted square-based pyramidal environments in all the complexes, are bridged alternately by oxpy and a ditopic spacer ligand to form infinite chains with fine structures varying with the flexibility of the ligand. Furthermore, there are interchain π ⋯ π interactions in 1 and 2 between the pyridyl rings of oxpy and the spacers. The dinuclear unit [Cu(trans-oxpy)Cu]2+ displays an integrity in the assembly process. Variable temperature magnetic susceptibility measurements on 3 showed the presence of antiferromagnetic coupling interactions between the copper(II) ions bridged by oxpy. Thermal analyses indicated that dehydration occurred around 110 °C and these complexes are stable up to 230 °C.

Graphical abstract: 1-D Structures of assemblies containing oxamidato dicopper building blocks controlled by ditopic N-donor spacers

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Publication details

The article was received on 01 Nov 2000, accepted on 07 Mar 2001 and first published on 19 Apr 2001


Article type: Paper
DOI: 10.1039/B008807M
Citation: J. Chem. Soc., Dalton Trans., 2001,0, 1664-1669
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    1-D Structures of assemblies containing oxamidato dicopper building blocks controlled by ditopic N-donor spacers

    H. Zhang, B. Kang, Z. Zhou, A. S. C. Chan, Z. Chen and C. Ren, J. Chem. Soc., Dalton Trans., 2001, 0, 1664
    DOI: 10.1039/B008807M

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