Diplatinum I Compounds

In the last decades, major efforts toward preparing diplatinum(I) compounds with Pd(I)-Pd(I) bonds were made with phosphorus-containing ligands, for example, phosphine, phosphide, phosphinito, 

The reaction between Pt(0) or Pt(II) hydride precursors and silane or germanes with E-H bonds (E = Si, Ge) can provide a variety of E-H bond activated products, for example, a series of silyl or germyl bridging diplatinum(I) compounds (Eigure 10.19) [130]. Further conversion of these compounds was possible including E-E bond coupling as well as the formation of Pt(II) silyl/germyl hydride. 

---

Recendy, gtJlium(III) htilide was used to reduce Pd(II) and Pt(II) precursor in the presence of an arene, to afford arene-bridged diptJladium(I) or diplatinum(I) compounds (Scheme 10.58) [79]. For... 

The reaction between a known phosphide bridging diplatinum(I) compound 174 [132] and [AgOTf] produced a Lewis acid adduct at the Pt(I)-Pt(I) bond (175) (Scheme 10.76) [126]. The coordination of Lewis acid has only minor influence on the Pt-Pt-P core. 

A phosphinito (R PO") bridging diplatinum(I) compound 177 and its protonation reactions were reported recently. Complex 177 was protonated by a variety of proton sources (HCl, HBr, HBF, PfOlHCyj) to produce a series of phosphide hydride bridged diplatinum(II) compounds, while two of the protonations are presented in Scheme 10.78 [128]. It was found that the protonation preferentially... 

Two diphosphane bridging diplatinum(I) compounds 180, 181 (Figure 10.18) were synthesized tilong with their dipalladium(I) counterpart (107, Section 10.2.2.2) [72]. They were demonstrated to exist as polymers or oligomers in the solid state, and the luminescence properties of these compounds were studied [72],... 

A diplatinum(I) hydride with unsupported Pt(I)-Pt(I) bond was reported recently, from a C-H bond activation of toluene (Scheme 10.79) [129]. The Pt(I)-Pt(I) bond length in diplatinum(I) compound 183 is 2.6069(2) A (Entry 15, Table 10.12), while the two hydrides were found to be both terminal. 

A phosphide-bridged diplatinum(I) bis-ethylene compound 166 (Scheme 10.73) was made by a ligand exchange reaction from ethylene and a diplatinum(I) carbonyl precursor [122]. The Pt(I)-Pt(I)... 

A few paddlewheel diplatinum(III) compounds were reported in the last decade, and some representative examples are presented in Figure 10.24 [145]. It was revealed that the Pt(III)-Pt(III) bond lengths of compounds 210-Cl/Br/I (Entries 12-14, Table 10.14) were influenced by the axial ligands as well as intermolecular lattice packing effects, and these compounds exhibited unprecedented near-infrared emission at room temperature [145cj. 

As far as the arrangement is concerned, the cis complexes of type Pt(pym)2M are very common with a h-h bases arrangement (I, Fig. 4), whereas a h-t pattern is found in diplatinum complexes (V, Fig. 4). These compounds are prepared through a condensation reaction between mononuclear complexes, according to... 

Only one reaction is known in which a gold compound reacts with HFA. (Triphenylphosphane)methylgold(I) forms a four-membered ring 190, which is assigned a structure related to the diplatinum compound 186 (196). 

Preparation of carbon-bonded CH2COO complexes gives the impression that the platinum ion favors carbon-bonded structures as is known in the case of various mononuclear platinum complexes (26-29), and the tetraacetate complexes do not exist as stable compounds. The tetra(acetato)diplatinum complex, [Pt2(CH3C00)4(H20)2] (Fig. 8), was eventually prepared, however, by refluxing a solution of K2[Pt (NOalJ in CH3COOH-I M HCIO4 (2 1) (30, 31). 

---