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Photoreactivity of diethanolamine with octacyanomolybdate(IV) and ‐tungstate(IV)
Author(s) -
Ali S. I.,
Majid Kowsar
Publication year - 1997
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1997)29:11<819::aid-kin2>3.0.co;2-p
Subject(s) - chemistry , diethanolamine , tungstate , medicinal chemistry , nuclear chemistry , inorganic chemistry , organic chemistry
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 k 3 > k 4 over a range of concentrations, the observed rate law is: \scriptfont4=\seveni $$k_{\rm obs.}={k_{2}k_{4}\rm I_{a}[OH^{‐}][NH(CH_{2}CH_{2}OH)_{2}]\over I+\it k_{2}[\rm OH^{‐}]}$$ 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 metal‐to‐ligand electron transfer transition. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 819–824, 1997