Homoleptic complexes platinum

The first homoleptic, dinuclear platinum(I) carbonyl complex [Pt2(CO)6]2+ has been prepared by dissolving Pt02 in concentrated sulfuric acid under a CO atmosphere.92,93 The structure is rigid on the NMR time scale at room temperature. DFT studies suggested a staggered structure for the dimer.92,93... 

Atypical synthesis of naAed NHC-containing complexes has been reported by Cloke and coworkers. As shown in equation (7), the co-condensation of nickel, paUadium, and platinum vapor with the free NHC, TBu, provided two-coordinated homoleptic complexes of Ni(0), Pd(0), and Pt(0) (43). Unfortunately, in addition to the poor yield of the isolated product, this original methodology required a metal vapor synthesis apparatus. 

Elements of this group, like metals of groups 8 and 9, form mononuclear and cluster homoleptic complexes in which metals adopt a zero oxidation state. The following homoleptic complexes of these elements are known [M(CNR)4] (M = Ni, Pd, Pt), [Ni(CNR)4], [Ni4(CNR),], [Ni4(CNR)4] , [NigiCNR). ], [Ni4(CNR)i4](C104)s, and [Ni3(CNR),i](C104)6. Linear structures were assigned for the last two compounds.Monomeric platinum and palladium compounds... 

By way of example, we can focus on the cyano complexes. Palladium and platinum can form homoleptic complexes with two, four, or six cyanides, depending on the metal oxidation state zero, two, and four, respectively. Rhenium forms heptacyano complexes in its - -3 and -t-4 oxidation states but forms an octacyano complex in its -t-5 state. Molybdenum and tungsten also appear commonly in octacyano complexes for +4 and - -5 oxidation states, and heptacyano analogs for the - -2 and - -3 cases, with only one occurrence of [Mo(CN)6]" anions in two oxidation states (n = 3, 4). Similar situations can be found with phosphine or carbonyl complexes. For instance, the group... 

The synthesis and chemistry of platinum nitrates has been recently reviewed.1621 The only homoleptic nitrate complex is K2Pt(N03)6 formed from K tBre and N2Os. Oxidation of the nitrito complex K2Pt(N02)4 gives K2Pt(N02)6> and not the nitrate complex. 

The coordination chemistry of the cyanate, thiocyanate and selenocyanate ligands has been recently reviewed.1874 Platinum(II) forms the complex ion Pt(SCN)2-, and the corresponding homoleptic platinum(IV) complex Pt(SCN)i can be prepared. Numerous mixed ligand complexes of platinum(II) are known containing the thiocyanate ligand and other ligands, although there are fewer platinum(IV) examples. 4... 

In contrast to nickel, simple homoleptic Tpx or Bpx, and heteroleptic pyrazolylborate-halide complexes of palladium and platinum are largely unexplored. Indeed, while for 3d metals these are "standard" targets for each successive generation of poly(pyrazolyl)borate ligand, for the... 

Homoleptic platinum carbonyl anions, characteristics, 8, 410 Homoleptic tantalum complexes, preparation and characteristics, 5, 108... 

Platinum complexes, 39-43 Pnicogen atoms coordinated to E-E bonds, homoleptic dielement compounds with, 61-65 Polysilanes, 1-52 characterization, 34-37 mechanistic proposals, 13-18 Primary alkylsilanes, condensation, 23 Primary arylsilanes, 18-22 Primary silanes, 18, 22-24 condensation by metallocene catalysts, 19 Protic reagents, 170 2-Pyridylboronic esters, 223... 

Bauerle and coworkers have synthesized a re-conjugated catenane, utilizing Cu(I) templation and a newly developed method for acetylenic homocoupling based on the reductive elimination of platinum to generate the desired C-C bond formation (Scheme 6.16) [65,66]. The C-shaped 57 was first preorganized around Cu(I), resulting in the homoleptic bis-phenanthroline complex 58. After removal... 

PF3 is the strongest of the P-donor n acids and its ability to replace carbon monoxide in a zerovalent transition metal complex was realized in the 1940s by Chatt. However, WiUdnson was the first to isolate a homoleptic PF3 complex, viz. [Ni(PF3)4] see Homoleptic Compound), which turned out to be more thermally stable than [Ni(CO)4] subsequent research into the PF3 complexes of transition metals was carried out by Nixon. Bidentate ligands with two PF2 moieties have been prepared an example is F2P(l,2-cyclo-C6Hio)PF2. The volatility of the homoleptic PF3 transition metal species together with their relative stability has led to their use in MOCVD processes [Pt(PF3)4], for instance, has been used to deposit platinum films. ... 

Figure 2.8.7 Molecular structures of the homoleptic platinum (0) complexes of bis-stannylenes 17 (left, coordinated THF molecules are not shown for clarity) and 18 (right)...

There are emissive homoleptic bis(l-2-enedithiolate) Pt, Zn, Cd, and Hg dianions. Even though these complexes are isostructural, their excited state assignments differ. The homoleptic platinum complexes, [Pt(mnt)2] " and [Pt(qdt)2] ", have a lowest lying MLCT transition whereas the corresponding group UB complexes, [M(mnt)2] " (M = Zn, Cd, and Hg), [Zn(qdt)2] ", and [Zn(tdt)2] ", have what is best described as a lowest lying ILCT transition [16,29,36]. 

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