Spectroscopic and kinetic studies of the molecular association between ferrocene-hydroxyaniline Schiff bases and p-benzoquinones

Shaeel A. Al- Thabaiti and Hanadi M. Arafa¹

Department of Chemistry, Faculty of Science, King Abdul Aziz University, P.O. Box. 80203, Jeddah - 21589 (Saudi Arabia). ¹Department of Chemistry, Faculty of Girls Education, Tabouk University, P.O.Box 741 Tabouk 71491 (Saudi Arabia).

Received on April 21, 2009 and accepted on June 03, 2009

ABSTRACT

The molecular interaction of ferrocen hydroxyaniline Schiff bases with 2,3-Dichloro-5.6-dicyanobenzoquinone (DDQ) Chloranil (CHL) and chloranil complexes (CHLC) in ethanol has been studied by electronic absorption, time resolved and solvents with different polarities. The system forms charge transfer (CT) complex characterized by an electronic absorption band. The association constants of the system were calculated at different temperatures within the range interval of 298-330oK, furthermore; the reaction rate constants, order of reaction and the enthalpy change of the association process were elucidated.

Keywords : Charge-Transfer; Electronic absorption, Solvents effect and Dissociation constants.