Notes

Abstract

Notes 5737 1062. Alkylplatinum Chlorides By S. F. A. KETTLEIT is a remarkable fact that although trimethylplatinum compounds were first reported by Pope and Peachey in 1907,l and have now a fairly extensive chemistry, no analogous compound containing a different alkyl group has ever been reported, although several attempts have been made to synthesise such compounds.2We now report a more general method for the preparation of the trialkylplatinum halides. The method is simple, gives fairly good yields, and leaves the metal as the only platinum by-product, so facilitating recovery.Experimental. Dimethylmercury (4.0 g.) was added dropwise to a solution of anhydrous platinum tetrachloride (1.3 g.) in acetone (50 ml.) cooled to -78" until reaction ceased. The black solution was then refluxed until the initially colloidal platinum was precipitated, leaving a pale yellow solution. Removal of solvent followed by vacuum sublimation gave 90% of the methylmercuric chloride required by 3HgMe, + PtCI, __t 3MeHgCI + Me,PtCI.

The First Family of Platinum(IV) Acetonyl Complexes. Mono-, Bis-, and Tris(acetonyl) Derivatives

“…The oxidation state of the metal has little effect on the Pt−C distances, since the range in 1 · C , 6 , 8 , and 9 (2.100(4)−2.063(4) Å) is similar to that found in acetonyl platinum(II) compounds (2.116(8)−2.03(4) Å). ,, The same effect was observed for methyl platinum(II) and platinum(IV) complexes …”

Millisecond FT-IR Spectroscopy of Surface Intermediates of C2H4Hydrogenation over Pt/Al2O3Catalyst under Reaction Conditions

“…The most probable candidate is a surface ethyl species. In fact, CH 3 CH 2 Pt is expected to have a CH 2 wagging mode around 1200 cm -1 according to ethyl-Pt coordination model compounds. ,, A band at 1175 cm -1 observed by HREELS has been attributed to an ethyl surface species generated by CH 3 CH 2 Cl photodissociation on a single-crystal Pt(111) surface at 100 K, and reflection absorption infrared spectra recorded upon dissociation of CH 3 CH 2 I on Pt(111) at 150 K showed a band at 1185 cm -1 . The latter is in agreement with the HREELS result considering the spectral resolution of the electron energy loss method.…”