Organoplatinum compounds

Nucleophilic addition of organoplatinum compounds to carbonyls and CN multiple bonds has been little investigated in comparison with those of organopalladium compounds.482... 

Figure 3.5 Pi 4f XPS spectra of platinum metal (top) and of the two organoplatinum compounds shown in Figure 3.4, illustrating that the Pt 4f binding energy reflects the oxidation state of platinum (adapted from Muijsers etal. [25]).

Cyclopropane reacted with hexachloroplatinic acid to give 1,1-dichloroplatinacyclobutane which usually forms polymers. Another route to these organoplatinum compounds was the reaction of cyclopropane derivatives with dichloro(ethene)platinum dimer. Treat-... 

Table 8 OLED performance parameters for devices utilizing organoplatinum compounds...

Lewis-acidic metal complexation often has a marked effect on the optical properties of organoplatinum compounds. Metal-metal-bonded bi- or trimetaUic units often constitute a chromophore in themselves, giving rise to low-energy absorption and sometimes luminescence attributed to metal-to-metal charge transfer (MM CT) transitions [27, 28]. Additionally, a marked blue shift of metal-to-ligand charge transfer (MLCT) absorptions is usually observed upon complexaticai of a platinum(ll)... 

As organoplatinum compounds have similar properties to organopalladium compounds [2], they are prepared by similar methods to those of organopalladium compounds. Organoplatinum compounds are prepared mainly by the following seven reactions. 

Organoplatinum compounds easily react with unsaturated hydrocarbons such as monoolefins, diolefins and acetylenes to afford the 7r-complexes. For example, reactions are shown in eqs. (21.1)-(21.5). The compound shown in eq. (21.1) is the Zeise salt of an ethylene-platinum complex found at first as an organotransition metal compound [11-17]. 

Organometallic compounds such as organolithium compounds, Grignard reagents, organotin compounds and organothallium compounds react with platinum halides to afford organoplatinum compounds [11,13,19-27]. For example, reactions are shown in eqs. (21.6)-(21.13). The order of the stability of the many compounds obtained by these reaction methods are as follows ... 

Cyclometalations on the various kinds of metal compounds easily proceed to give stable compounds [36]. These reactions affords selectively five-membered ring compounds, which are very stable [35]. Cyclometalations on platinum compounds easily proceed to give stable organoplatinum compounds [36-89]. For example, reactions are shown in eqs. (21.24)-(21.27) [36,37,41,43]. 

Isonitriles, acetylenes having an active hydrogen or alcohols react easily with platinum compounds to afford the organoplatinum compounds. For example, reactions are shown in eqs. (21.28)-(21.31) [11,90-94]. The reaction with ethyl alcohol shown in eq. (21.30), yields the Zeise salt by dehydration. This is the reaction that Zeise published in 1830 [93]. 

---