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

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.