Photoreactivity of diethanolamine with octacyanomolybdate(IV) and -tungstate(IV)

✍ Scribed by S. I. Ali; Kowsar Majid

• Book ID: 101257046
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 150 KB
• Volume: 29
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1997)29:11<819::aid-kin2>3.0.co;2-p

✦ Synopsis

An investigation is presented on the kinetics of complexation of aqueous solution of octacyanomolybdate (IV) and -tungstate (IV) after photoinitiation with one of the mixed group ligands containing both N and O, diethanolamine (DEOA), [NH(CH 2 CH 2 OH) 2 ]. Under the steady state conditions and with approximation over a range of concentrations, k Ͼ k 3 4

the observed rate law is:

The complexes show shift in electronic transition supporting the mechanism of association of the ligand followed by the abstraction of some small molecules and then substitution by the ligand. The presence of the specific isobestic point also contributes towards the stability of the complex. The rate constant and quantum yield values are dependent on both the concentration of the metal cyanide and the ligand predicting the mechanism to be an associative one. The complexes have strong absorption in the visible range and are assigned metalto-ligand electron transfer transition.