| Autor: |
Kapoor, Ramesh, Kataria, Ashok, Venugopalan, Paloth, Kapoor, Pratibha, Hundal, Geeta, Corbella, Montserrat |
| Zdroj: |
European Journal of Inorganic Chemistry; October 2005, Vol. 2005 Issue: 19 p3884-3893, 10p |
| Abstrakt: |
Mononuclear cobalt(II) complexes [Co(S-dept)X2] [X = Br (1), I (2) and NCS (3)] were synthesized using N,N,N′,N′-tetraethylpyridine-2,6-dithiocarboxamide (S-dept), and characterised by conductivity, spectral and single-crystal X-ray diffraction studies. These studies reveal that the compounds consist of discrete monomeric molecules in which the cobalt atoms are five-coordinate in an environment that is best described as being distorted square-pyramidal. In dimethylformamide the iodo complex shows significant ionic dissociation (1:1 electrolyte) and its crystal field absorption spectrum is interpretable in terms of an octahedral structure [Co(S-dept)(DMF)2I]+. The temperature dependence of the magnetic susceptibility data is indicative of a high-spin compound with an important zero-field splitting. The best fitwas obtained with |D| = 20.5 cm–1 and g = 2.53 for 1, |D| = 14.2 cm–1 and g = 2.38 for 2 and |D| = 17.7 cm–1 and g = 2.35 for 3. The X-band EPR spectra at low temperature is also characteristic of an S = 3/2 state with important zero-field splitting. The most important band appears at low fields (ca. 1200 G). (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) |
| Databáze: |
Supplemental Index |
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