Single crystal polarized electronic spectra of a five-coordinate macrocyclic complex of nickel(II)

The single crystal polarized electronic spectra of the square pyramidal five coordinate complex Ni(TMC)(N3)ClO4, where TMC is the saturated macrocyclic ligand 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane, have been assigned to the d-d transitions and guesses of the values of the ligand field parameters in the additive scheme have been made. It is suggested that the Dq value of the equatorial nitrogen donors is comparable to that of the corresponding non-cyclic amine complexes, and that it is mainly affected by the nickel-nitrogen distance.