Light induced hydrogen production from ethanolic aqueous solutions sensitizzed by 2, 4-dimetboxy benzylidene-2-hydroxy aniline and some of its metal complexes

Abstract EN

Hydrogen productions were achieved by irradiating ethanolic aqueous solutions (20%, v/v) containing mixtures of the ligand 2,4-dimeihoxybcnzylidene-2-hydroxy aniline (HL) or one of its complexes (ML2) with the following divalent ions: Mil (11), Fc(II), Co(ll), Ni(U), Cu(II) and Zn (11).

as photosensitizers, methyl viologen (MV ) as electron acceptor, ethylene diamine tetraacetic acid disodium salt (HDTA) as a sacrificial electron donor, in presence of platinum poly (vinyl alcohol) (?،•?٧٨) or platinized '1'0؛ (Pt/TiÛ2), (200 and 45 micron) as reduction catalysts, using white light from 250 w xenon arc lamp at room temperature 25±2 °c.

Oxidation Potentials of the ligand and its complexes were determined by cyclic voltammetry.

The efficiency of the photorcduclion of MV2+ and hydrogen production by HL and metal complexes was mainly dependant on pl-J, type and particle size of catalyst, as well as metal ion!؛ case of MI,2.

Best performances were recorded by the free ligand.