Platinum-tin bonds

In summation, the 7 (195Pt, 119Sn) can be used to assign structure where the mode of binding of the tin is in question and large one-bond platinum-tin J values are to be expected and seem manageable within the context of the Fermi contact term. 

Olefin isomerization has been widely studied, mainly because it is a convenient tool for unravelling basic mechanisms involved in the interaction of olefins with metal atoms (10). The reaction is catalyzed by cobalt hydrocarbonyl, iron pentacarbonyl, rhodium chloride, palladium chloride, the platinum-tin complex, and by several phosphine complexes a review of this field has recently been published (12). Two types of mechanism have been visualized for this reaction. The first involves the preformation of a metal-hydrogen bond into which the olefin (probably already coordinated) inserts itself with the formation of a (j-bonded alkyl radical. On abstraction of a hydrogen atom from a diflFerent carbon atom, an isomerized olefin results. 

Rh, Pt, etc. Plans are under way in this laboratory for studies of the static and dynamic structure of CO on binary and ternary alloys (e.g., ruthenium/platinum/tin) in methanol for fuel-cell applications. Such alloys display enhanced resistance to CO poisoning, and the nature of this resistance is appropriate for NMR investigation. For example, Pt-CO bonding information such as Pt-C connectivities, CO orientation and clustering, are accessible by Ti, T2, isotope dilution, and related techniques. In fact, essentially all of the techniques used in the past 20 years to study the solid-gas interface should now be applicable to NMR-electrochemistry, with the added bonus of potential control. 

Figure 11. The model of structure of the platinum-tin complex anion. The inter-atomic distances (and some related bond angles) specified those determined with certainty on the basis of simulation of the RDF in Fig. 10, because of the sufficiently high contribution of these distances to the RDF.

A variety of compounds with metal metal bonds have been prepared. Mercurous compounds which contain the [Hg-Hg] " unit have long been known. More recent examples include compounds in which carbon monoxide is a ligand such as (Co)sMn Re(CO)s and (C6H5)3PAu-Co(CO)4. A number of complexes with transition metal tin bonds have been prepared. One of these, [Pt(SnCl3)5], contains five-coordinated platinum(ll) and is an excellent hydrogenation catalyst. 

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