π-BONDING IN INORGANIC COMPOUNDS: IV. ROLE OF UNPAIRED ELECTRONS IN HEXAHALO COMPLEXES

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Abstract
A study of dπ–pπ bonding in paramagnetic compounds having the potassium chloroplatinate structure is described. It is shown that the magnetic superexchange effect is approximately proportional to the number of unpaired electrons in t2g5 and t2g4 systems but there is an irregularity in the t2g3 system of potassium chlororhenate. This singularity of the t2g3 case is considered to be a result of the orbital and crystal symmetries. The magnetic properties of the compounds are related to the extent of π-bonding stabilization in octahedral complexes having various configurations t2gn on their central atoms.