
TY  - JOUR
A1  - Harris, CM 
A1  - Lockyer, TN 
A1  - Martin, RL 
A1  - Patil, HRH 
A1  - Sinn, E 
T1  - Five- and six-coordinated complexes of cobalt(II) with 2,2',2'-terpyridyl: Unusual structure and magnetism
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1969
VL  - 22
IS  - 10
SP  - 2105
EP  - 2116
KW  - 
UR  - https://doi.org/10.1071/CH9692105 
N2  - Cobalt(II) complexes of the type [Co(terpy)X2] (I), [Co(terpy)2]X2,nH2O (II), and [Co(terpy)2]Y2,nH2O (III), where X = Cl-, Br-, I-, NCS-, and Y = ClO4-, [BPh4]-, have been prepared and characterized by magnetic, spectroscopic, and conductance measurements. The ?mono? complexes (I) are 5-coordinated and monomeric, non-ionic in nitrobenzene, and have high-spin magnetic moments in the range 4.7-5.0 B.M. They are readily and reversibly converted into the ?bis? complexes (II) with the addition or loss of a molecule of terpyridyl: [Co(terpy)X2]+ terpy &#8596; [Co(terpy)2]X2     The bis complexes (II) and (III) exhibit the characteristic features of the electronic cross-over phenomenon, their magnetic moments being strongly dependent on temperature, the anion X or Y, and water of crystallization. A model based on the 4T1-2E cross-over is set up which gives a good representation of the magnetic properties. Values of the difference between the zero-point energies of the 4T1 and 2E states are given for the various compounds.     Attempts to isolate halogeno complexes of the type [Co(terpy)X]+ were unsuccessful. 
ER  -

