title: [Relation between complexes iotramolecular transfer and structure of [M(SS) (NN)](M = Zn2+, Cd2+)].
abstract: The title complexes of [M(SS)(NN)](M = Zn2+, Cd+; SS = 1,2-dicyano 1,2-ethylene -dithiolate or maleonitriledithiolate; NN = 5-nitro-1,10 phenanthroline) were synthesized. The electronic absorption spectra of complexes [M(SS)(NN)] in DMSO, DMF, acetone and Py were reported. The spectra absorption bands 270-280 nm, 320-350 nm and 350-390 nm are the intraligand pi(b) --> pi* transfer of ligand mnt(2-) and 5-NOz-phen. The spectra absorption band 400-500 nm is intramolecular charge transfer (LL'CT) from a ligand (mnt(2-)) to another ligand (5-NO2- phen) The relation between electronic spectra absorption band and correlative transition in the molecular orbital energy level diagram of the complexes was investigated. The LL'CT band of the title complexes is weaker by comparison with M(SS) (NN) (M = Co2+, Fe2+, Ni2+ and Cu2+). The LL'CT band of [M(SS) (NN)](M = Zn2+, Cd2+) (7b2 to 7b1) is symmetry forbidden.
authors.affiliation: Department of Chemistry and Chemical Engineering, Huanghuai University, Zhumadian 463000, China. panqc2004@yahoo.com.cn
authors.forename: Qing-Cai
authors.initials: QC
authors.lastname: Pan
authors.forename: Yong-He
authors.initials: YH
authors.lastname: Zhao
authors.forename: Hong-Qi
authors.initials: HQ
authors.lastname: Shen
authors.forename: Feng-Mei
authors.initials: FM
authors.lastname: Yan
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Zheng-He
authors.initials: ZH
authors.lastname: Peng