Dinuclear complexes with a μ-cyano ligand. part IX. synthesis,characterization and magnetic studies of several derivatives of [Cr(CN)6]3− and [Cr(NO)(CN)5]3− |
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Authors: | Joan Ribas Montserrat Monfort Jaume Casabó |
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Institution: | (1) Departament de Química Inorgànica, Facultat de Química, Universitat de Barcelona, Diagonal, 647 Barcelona, Spain;(2) Departament de Química Inorgànica, Universitat Autònoma de Barcelona, Barcelona, Spain |
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Abstract: | Summary Twelve dinuclear complexes, each with a bridging cyano group, of formulaecis-M(aa)2FCr-NC-Cr(CN)5] andcis- M(aa)2FCr-NC-CrNO(CN)4] (aa=ethylenediamine or 1,3-diaminopropane; M=K+, Na+ or NH
4
+
) have been prepared by solid state heating of the corresponding doubly complexed saltstrans-MCrF(H2O)(aa)2]Cr(CN)6] andtrans-M CrF(H2O)(aa)2]CrNO(CN)5]. All have been characterized by chemical analysis, electronic and i.r. spectra and conductivity measurements.Magnetic susceptibilities down to liquid helium temperature have been determined forcis-K(en)2FCr-NC-Cr(CN)5],cis-K(tn)2FCr-NC-Cr(CN)5] andcis-K(en)2FCr-NC-CrNO-(CN)4]. Slight antiferromagnetic interactions have been found in the first two compounds (J=–1.4 and –1.2 cm–1, respectively). Thecis-K(en)2FCr-NC-CrNO(CN)4] compound behaves as a Curie paramagnet and a structural model is proposed to explain this fact. |
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