Base hydrolysis of trans-dichlorodiammineplatinum (II)
Date
Authors
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Research Projects
Organizational Units
Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
Journal Issue
Is Version Of
Versions
Series
Department
Abstract
The reactions t- [Pt(NH3)2Cl2 ] + OH- ->t- [Pt(NH3)2C1(OH) ] + CIt- [Pt(NH3) 2 Cl(OH)] + OH-- -> t- [Pt(NH3) 2 (OH) 2 ] + Cl in aqueous solutions were studied by measuring the changes in specific conductivity and in ultraviolet absorption which occurred during the course of the reactions. The rates of reaction were determined from a plot of ln L(t) vs time, where L(t) is either (optical density at infinite time)( optical density at time t) for the spectrophotometric determinations or (conductivity at time t) - (conductivity at infinite time) for the conductometric experiments. The conductometric experiments also required correction for hydroxide attack upon the measuring vessel. Both reactions were found to be zero order in hydroxide, to be the only reactions occurring between the platinum complex and the hydroxide for times up to one day, and to involve the formation of an aquo intermediate. The rates for the first hydrolysis were 6. 21 x 10-5 sec -1- at 20 °C, 10. 6 x 10 -5 sec-1 at 25°C, and 29.3 x 10-5 sec-1 at 35°C, with an energy of activation of 18.0 kcal and an entropy of activation of -16 cal/ °K. The rates for the second hydrolysis were 0.17 x 10-5 sec-1 at 25°C and 0. 50 x 10-5 sec-1 at 35°C, with an energy activation of 19.1 kcal and an entropy of activation of -21 cal/ °K.