
TY  - JOUR
A1  - Graddon, DP 
A1  - Heng, KB 
A1  - Watton, EC 
T1  - Complexes of cobalt(II) halides with 4-substituted pyridines
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1968
VL  - 21
IS  - 1
SP  - 121
EP  - 135
KW  - 
UR  - https://doi.org/10.1071/CH9680121 
N2  - 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. 
ER  -

