Professor R. H. Holm for his interest in this project and Ruth Records for her assistance with measurements. Y.-C.L. was a visiting scholar from the Beijing Institute of Chemical Reagents. A.M.S. was a predoctoral fellow of the Fannie and John Hertz Foundation. Financial support of this research was provided by grants from the National Science Foundation (CHE-77-04397 and CHE-80-09240) and the National Institutes of Health (GM-20276 and HL-16833).
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