Abstract

ESR studies on [Cu(trien)(enMe 4 )](BO 4 ) 2 and [Cu(trien)(enEt 2 )](BO 4 ) 2 are carried out to understand the coordination behaviour, fluxional nature, N-alkylation effects on metal ligand bonds. It is found that the alkylated N-donor atoms are occupying axial positions in these hexacoordinate complexes having CuN 4 N 2 ′ moieties. It is also observed that in frozen pyridine solutions these complexes have undergone geometric transition from distorted elongated octahedral to distorted compressed tetrahedral symmetry.

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