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Issue 23, 2009
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Hydrogen-bonded pillars of alternating chiral complex cations and anions: 1. Synthesis, characterization, X-ray structure and thermal stability of catena-{[Co(H2oxado)3][Cr(C2O4)3]·5H2O} and of its precursor (H3oxado)[Co(H2oxado)3](SO4)2·2H2O

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Abstract

Compound (H3oxado)[Co(H2oxado)3](SO4)2·2H2O (1) (H3oxado+ = oxamide dioximemonoximium) reacted metathetically with Ba6(H2O)17[Cr(C2O4)3]4·7H2O in water to give the one-dimensional complex salt {[Co(H2oxado)3][Cr(C2O4)3]·5H2O} (2) (H2oxado = oxamide dioxime). Compounds 1 and 2 were characterized by elemental analysis, FTIR, UV-Vis and by single crystal X-ray structure determination. The structure of 2 consists of infinite pillars of alternating chiral complex cations and anions linked together along [100] by electrostatic and longitudinal O–H⋯O interactions, with an average intrachain Co⋯Cr separation of 4.94 Å. Equatorial N–H⋯O bridges cross-link neighboring pillars (which are of opposite chirality) and consolidate a three-dimensional lattice framework which delineates elliptic nanochannels parallel to the a axis, encapsulating highly disordered water molecules. The thermal stability of both compounds was assessed by TGA, and the effective magnetic moment of 2, checked at room temperature, revealed considerable spin–orbit coupling.

Graphical abstract: Hydrogen-bonded pillars of alternating chiral complex cations and anions: 1. Synthesis, characterization, X-ray structure and thermal stability of catena-{[Co(H2oxado)3][Cr(C2O4)3]·5H2O} and of its precursor (H3oxado)[Co(H2oxado)3](SO4)2·2H2O

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Supplementary files

Article information


Submitted
23 Oct 2008
Accepted
06 Jan 2009
First published
20 Feb 2009

Dalton Trans., 2009, 4519-4525
Article type
Paper

Hydrogen-bonded pillars of alternating chiral complex cations and anions: 1. Synthesis, characterization, X-ray structure and thermal stability of catena-{[Co(H2oxado)3][Cr(C2O4)3]·5H2O} and of its precursor (H3oxado)[Co(H2oxado)3](SO4)2·2H2O

M. M. Bélombé, J. Nenwa, Y. A. Mbiangué, F. Majoumo-Mbé, P. Lönnecke and E. Hey-Hawkins, Dalton Trans., 2009, 4519
DOI: 10.1039/B818793B

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