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Synthesis and X-ray powder diffraction characterization of tetra- and hexa-imidazole complexes of magnesium(II)

Published online by Cambridge University Press:  29 February 2012

Norberto Masciocchi ,
Luigi Garlaschelli  and
Giulia Peli
Norberto Masciocchi
Affiliation:
Dipartimento di Scienze Chimiche e Ambientali, Università dell’Insubria, via Valleggio 11, 22100 Como, Italy
Luigi Garlaschelli
Affiliation:
Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Università di Milano, via Venezian 21, 20133 Milano, Italy
Giulia Peli
Affiliation:
Dipartimento di Scienze Chimiche e Ambientali, Università dell’Insubria, via Valleggio 11, 22100 Como, Italy
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Abstract

X-ray powder diffraction data for two ionic salts containing imidazole (Him) complexes of the magnesium(II) ion, [Mg(Him)4(H2O)2]Cl2 and [Mg(Him)6](NO3)2, are reported. Their crystal and molecular structures were determined by simulated annealing and full-profile Rietveld refinement methods. [Mg(Him)4(H2O)2]Cl2 was found to crystallize in the monoclinic system with space group C2/c, a=12.3980(3) Å, b=11.0234(2) Å, c=14.4691(3) Å, and β=107.024(1)°. [Mg(Him)6](NO3)2 crystallizes in the trigonal R-3 space group with a=b=12.4631(4) Å and c=14.9449(6)Å. Both species contain centrosymmetric complexes, and Mg is octahedrally coordinated by six imidazoles, as in [Mg(Him)6](NO3)2, or by four imidazoles and two water molecules, as in [Mg(Him)4(H2O)2]Cl2. Additional analytic, thermogravimetric, calorimetric, and spectroscopic characterizations were also performed.

Keywords

powder diffractionmagnesiumimidazoleRietveld refinement
Type
Technical Articles
Information
Powder Diffraction , Volume 23 , Issue 4 , December 2008 , pp. 286 - 291
Copyright
Copyright © Cambridge University Press 2008

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