Synthesis, crystal structure and metamagnetic properties of a two-dimensional honeycomb network based on ferricyanide and (3,10-dimethyl-1,3,5,8,10,12-hexaazacyclotetradecane)nickel(II) building blocks[hair space]

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Hui-Zhong Kou, Song Gao, Wei-Ming Bu, Dai-Zheng Liao, Bao-Qing Ma, Zong-Hui Jiang, Shi-Ping Yan, Yu-Guo Fan and Geng-Lin Wang


Abstract

The 2-D bimetallic complex [NiL]3[Fe(CN)6]2·9H2O (L represents 3,10-dimethyl-1,3,5,8,10,12-hexaazacyclotetradecane) has been prepared and its structure and magnetic properties studied. The structure consists of cyano-bridged neutral Ni3Fe2 units. Each hexacyanoferrate(III) ion connects three nickel(II) ions using three cis CN groups and the remaining CN groups are terminal. The bridging cyanide ligands co-ordinate to the nickel ion in a trans fashion forming trans-NiL(N[triple bond, length half m-dash]C)2 moieties. The nine water molecules are situated between the 2-D layer and hydrogen bonded to the terminal CN ligands. Magnetic studies show that the complex displays a metamagnetic behaviour originating from intralayer ferromagnetic coupling and interlayer antiferromagnetic interaction. A long-range magnetic ordering over the lattice at Tc = 5 K is also observed.


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