Kinetic and mechanistic studies on the complexation and anation of dioxotetracyanomolybdate (IV) with 2,2′-bipyridyl in aqueous solution

✍ Scribed by S. I. Ali; Zakir Murtaza; Zaheer Khan

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 392 KB
• Volume: 28
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1996)28:9<705::aid-kin9>3.0.co;2-z

✦ Synopsis

Dioxotetracyanomolybdate( IV) has been found to form a 1 2 complex with 2,2'-bipyridyl The kinetics of the reaction has been studied over the pH range 5 3-8.7 by visible spectrophotometry under pseudo conditions The effect of the 2,2'-bipyridyl and dioxotetracyanomolyb-date1 IV). temperature, ionic strength, and pH on the reaction rate was determined The reaction follows first-order kinetics with respect to dioxotetracyanomolybdate( IV) ion and fractional-order kinetics with respect to 2,2'-bipyridyl Values for the outer-sphere complex formation constant ( Kos2 1 and rate constants (k2 1 were also calculated from the kinetic data It was found that rate of the reaction increases with the decreasing pH. The following rate equation based on the outersphere complexation equilibrium preceding the associative interchange has been derived. Kc,,, + Ka2Kos21H+I k , K o s , + ~2 K o , 2 I H + I K.32

where 8 , = k,K,,, + k2KOs2IHtJK,, and B2 = On the basis of the observed results probable mechanism has been proposed.