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Issue 13, 2011
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A supramolecular spin crossover Fe(III) complex and its Cr(III) isomer: stabilization of water–chloride cluster within supramolecular host

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Abstract

The metal complexes, [M(Hdammthiol)2]Cl·3H2O [M = Cr(III) (1), Fe(III) (2)] [where H2dammthiol is the thiol form of the ligand, diacetylmonoxime morpholine N-thiohydrazone] were synthesized by metal template reactions of diacetylemonoxime with morpholineN-thiohydrazide in the presence of CrCl3·6H2O and FeCl3·6H2O. Both the complexes (1 and 2) were characterized by single crystal X-ray crystallography, spectroscopic (IR and UV-vis), Mössbauer and TGA analyses. The single crystal X-ray studies of both complexes show that the supramolecular hosts, constructed by the discrete mononuclear complexes, form supramolecular channels along the c-axis which are filled up by water–chloride clusters. In both complexes, the 1D waterchloride chain with chair-like architecture within the supramolecular hosts presents novelty. The magnetic measurement study of Fe(III) complex shows a spin crossover from S = 1/2 at 2.5 K to S = 5/2 at 300 K. At very low temperature, the presence of strong cooperative hydrogen bonding interactions stabilizes the S = 1/2 state.

Graphical abstract: A supramolecular spin crossover Fe(iii) complex and its Cr(iii) isomer: stabilization of water–chloride cluster within supramolecular host

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Publication details

The article was received on 17 Sep 2010, accepted on 04 Jan 2011 and first published on 22 Feb 2011


Article type: Paper
DOI: 10.1039/C0DT01256D
Citation: Dalton Trans., 2011,40, 3166-3175
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    A supramolecular spin crossover Fe(III) complex and its Cr(III) isomer: stabilization of water–chloride cluster within supramolecular host

    R. Saha, S. Biswas, I. M. Steele, K. Dey and G. Mostafa, Dalton Trans., 2011, 40, 3166
    DOI: 10.1039/C0DT01256D

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