Issue 44, 2009
From the journal:

Dalton Transactions

Novel manganese(II) and cobalt(II) 3D polymers with mixed cyanate and carboxylate bridges: crystal structure and magnetic properties†‡

Yan-Qin Wang,a   Kun Wang,a   Qian Sun,a   Hua Tian,a   En-Qing Gao*a  and  You Songb  

* Corresponding authors

a Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai, P.R. China
E-mail: eqgao@chem.ecnu.edu.cn
Fax: 86 21 62233404
Tel: 86 21 62233404

b State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, P.R. China

Abstract

Two isomorphous 3D Mn(II) and Co(II) coordination polymers with a dicarboxylate inner salt and cyanate as coligands were synthesized and structurally characterized, and their magnetic properties have been studied. In the compounds, [M(L)(NCO)]n·nH2O (M = Mn, Co, L = 1-carboxymethylpyridinium-4-carboxylate), neighboring metal ions are linked by the 3-fold bridges of an end-on cyanate and two syn–syn carboxylate bridges to give an anionic chain of [M(µ-NCO)(µ–COO)2]n, and each chain is interlinked to four other chains by the cationic 1-methylpyridinium spacers to generate a 3D structure with the 42· 63· 8 net topology. They are the first compounds with mixed cyanate and carboxylate bridges. Magnetic studies reveal that the 3-fold mixed bridge propagates antiferromagnetic coupling in the Mn(II) compound but ferromagnetic coupling in the Co(II) compound. The rather complex magnetic behaviors of the Co(II) compound are analyzed taking into account the first-order spin-orbital coupling and the intrachain ferromagnetic interactions.

Graphical abstract: Novel manganese(II) and cobalt(II) 3D polymers with mixed cyanate and carboxylate bridges: crystal structure and magnetic properties

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Article information

DOI
https://doi.org/10.1039/B914592C
Article type
Paper
Submitted
20 Jul 2009
Accepted
11 Sep 2009
First published
30 Sep 2009

Dalton Trans., 2009, 9854-9859

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Novel manganese(II) and cobalt(II) 3D polymers with mixed cyanate and carboxylate bridges: crystal structure and magnetic properties

Y. Wang, K. Wang, Q. Sun, H. Tian, E. Gao and Y. Song, Dalton Trans., 2009, 9854 DOI: 10.1039/B914592C

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