THE position of alkynes in the trans-effect series for platinum(r1) complexes has not been reported, nor have the relative positions of substituted phosphines, arsines, and stibines been established.We report the results of kinetic studies of diethylamine exchange reactions at 25" in complexes of the type tran~-l,PtCl,[~~C]NHEt~ (I, = ligand) in methanol (Figure l), n-hexane (Figure Z), and benzene. The reaction products have been shown by spectra to be identical with the starting material.The order of decreasing trans-effect for various ligands 'L' is now established as follows :
cis- DiaquobisoxalatochrOmate( Ill) anion exchanges all eight of its oxalate oxygen atoms with solvent water a t the same rate in aqueous acid media at room temperature. Rates and Arrhenius parameters for this reaction are similar to those for the corresponding reaction of the trisoxalatochromate(l1l) anion.Exchange of the co-ordinated water of both cis-and trans-isomers in aqueous solution is negligible for at least eight days in neutral and acid media at room temperature.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.