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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Complexes of cobalt(II) halides with 4-substituted pyridines

DP Graddon, KB Heng and EC Watton

Australian Journal of Chemistry 21(1) 121 - 135
Published: 1968

Abstract

Complexes have been obtained from cobalt(11) chloride, bromide, iodide, and thiocyanate with eight 4-substituted pyridines, NC5H4R, where R = CH2C6H5, p-CH2C,6H,4Cl, CH2OH, Cl, Br, C02C4H9, COC6H5, and CN, in order of decreasing basicity. Twenty-nine of the compounds prepared are of the type CoX2B2, thirteen of the type CoX2B4, three CoX2B33 two CoX2B5, two CoX2B2(H2O)2, and one CoX2B(CH3OH). The stereochemistry of the cobalt atom has been assigned in each case on the basis of magnetic properties and reflectance spectra. In all cases but one the cobalt appears to exhibit octahedral or tetrahedral stereochemistry and to have the high-spin configuration; diiodotris(p-chloropyridine)cobalt(11) is probably an example of a low-spin 5-coordinate compound. The stereochemistry is largely determined by the halogen, the preference for octahedral stereochemistry increasing in the order I « Br < C1 « NCS. There is also a small effect due to the base, octahedral stereochemistry being favoured by the weaker bases. The behaviour of the compounds in nitrobenzene solution has also been studied.

https://doi.org/10.1071/CH9680121

© CSIRO 1968

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