ESR studies on some five coordinate copper (II) complexes in solutions

ESR and optical absorption studies have been made on four 5‐coordinate copper complexes, namely, Cu (trien) Br2, Cu (trien) (ClO4)2, [Cu (trien) NCS]Bφ4, and Cu (Me6trien) Br2 (where trien and Me6trien stand for triethylylenetetramine and N,N,N′N″,N‴,N‴‐hexamethlytrien, respectively) in solutions to study metal ligand bond nature and different contributions to line widths. The 4s character in the ground state is estimated and is found to influence spin‐Hamiltonian constants, bond parameters, and hyperfine linewidth. The hyperfine linewidth at room temperature is explained using the theory of Wilson and Kivelson.

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