title: Spectroscopic and electrochemical characterization of some Schiff base metal complexes containing benzoin moiety.
abstract: The ligation behavior of bis-benzoin ethylenediamine (B2ED) and benzoin thiosemicarbazone (BTS) Schiff bases towards Ru(3+), Rh(3+), Pd(2+), Ni(2+) and Cu(2+) were determined. The bond length of M-N and spectrochemical parameters (10Dq, β, B and LFSE) of the complexes were evaluated. The redox characteristics of selected complexes were explored by cyclic voltammetry (CV) at Pt working electrode in non aqueous solvents. Au mesh (100 w/in.) optically transparent thin layer electrode (OTTLE) was also used for recording thin layer CV for selected Ru complex. Oxidation of some complexes occurs in a consecutive chemical reaction of an EC type mechanism. The characteristics of electron transfer process of the couples M(2+)/M(3+) and M(3+)/M(4+) (M=Ru(3+), Rh(3+)) and the stability of the complexes towards oxidation and/or reduction were assigned. The nature of the electroactive species and reduction mechanism of selected electrode couples were assigned.
authors.affiliation: Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia. malsaeed@kau.edu.sa
authors.forename: M S
authors.initials: MS
authors.lastname: El-Shahawi
authors.forename: M S
authors.initials: MS
authors.lastname: Al-Jahdali
authors.forename: A S
authors.initials: AS
authors.lastname: Bashammakh
authors.forename: A A
authors.initials: AA
authors.lastname: Al-Sibaai
authors.forename: H M
authors.initials: HM
authors.lastname: Nassef
mesh_terms: D001573:Benzoin / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D004563:Electrochemistry; D004583:Electrons; D005029:Ethylenediamines / Q000737:chemistry; D008024:Ligands; D010084:Oxidation-Reduction; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013882:Thiosemicarbazones / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D005029:Ethylenediamines; D008024:Ligands; D012545:Schiff Bases; D013882:Thiosemicarbazones; C031234:ethylenediamine; D001573:Benzoin
keywords: Bond length; Chelates; Electrode mechanism; Racha parameters; Schiff bases; Thin layer voltammetry