Author:
Graddon DP,Heng KB,Watton EC
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.
Cited by
25 articles.
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