Abstract: In this paper, the ESR spectra of o-Bcnzoic sulfimide complexes of Mn (Ⅱ) and Cu examined it was observed that at low temperature in pyridinc and at room,emperature after adsorbed by zeolite the ESR spectra of Mn (Ⅱ) conplex exhibit unusual doublet. These spectra may be explained in tenns of a spinhamiltonium by considering unly the M=1/2 ←→M=-1/2 transitions, and theoccurence of forbidden △m=±1 transitions. The ESR spectra of Cu (Ⅱ) complexes in various solvents and at different temperatures were also studied, the bonding characteristic of complexes and their coordinating behaviours in various solutions are discussed.

Key words: O-Benzoic Sulfimide, FSR spectrum, Doublet, Forbidden transitions