Facile generation of platinum(IV) compounds with mixed labile moieties.Hydrogen peroxide oxidation of platinum(II) to platinum(IV) compounds

摘要

Hydrogen peroxide oxidation of platinum(II) compounds containing labile groups such as Cl,OH,and alkene moieties has been carried out and the products characterized.The reactions of [Pt~(II) (X_)2 (N-N)] (X = Cl,OH,X_2 = isopropylidenemalorate (ipm);N-N = 2,2-dimethyl-l,3-propanediamine [(dmpda),N-isopropyl-l,3-propan-ediamine (ippda)] with hydrogen peroxide in an appropriate solvent at room temperature affords [Pt~(IV) (OH)(Y)(X)_2(N-N)] (Y = OH,OCH_3).The crystal structures of [Pt~(IV)(OH)(OCH_3)(Cl)2(dmpda)] centre dot 2H_2O (P-l bar,alpha =6.339(2) A,b = 9.861(1) A,c = 11.561(1) A,alpha = 92.078(9)°,beta = 104.78(1)°,gamma = 100.54(1)°,V = 684.3(2) A~3,Z = 2,R = 0.0503) and [PtIVo(OH)2(ipm)(ippda)]-3H2O (C 2/c,alpha = 27.275(6) A,b = 6.954(2) A,c = 22.331(4) A,beta = 118.30(2)°,V= 3729(2) A~3,Z = 8,R = 0.0345) have been solved and refined.The local geometry around the platinum(IV) atom approximates to a typical octahedral arrangement with two added groups (OH and OCH_3;OH and OH) in a trans position.The platinum(IV) compounds with potential labile moieties may be important intermediate species for further reactions.