Complex with platinum dichloride

Bis[di-r-butylphosphano]telIurium reacted with platinum dichloride in toluene and with bis[benzonitrile]dichloroplatinum in dichloromethane to produce yellow crystals of the expected complex. ... 

Platinum dichloride forms complexes with ammonia, [Pt(NH3)4]Cl2, which on heating yields [PtCl2(NH3)2]. 

A derivative of 4-methylene-l,3,2-dithiastannetane 72 was prepared by reaction of diphenyltin dichloride with the dilithium salt of 2,2-diphenylethanedithioic acid (Scheme 39) <1996CB663>. A similar synthetic approach has been used for the preparation of 4-methylene-l,3,2-dithiagermetane 21 <2004AXEm357> and platinum complexes with cyanodithioimidocarbonate <2004JCD369>. 

Other S2N2 compounds containing divalent sulfur have been obtained by photolysis of (CF3S)3N and by treatment of tertiary amines with sulfur dichloride/ the products from the latter being of interest as fungicides and corrosion inhibitors. Platinum complexes of S2N2 have been prepared by treatment of phosphine-platinum complexes with S4N4/ and a copper (II) complex has been obtained. 

This process requires bond scissions and creations it can take place in solution but more often upon thermal activation during drying. The strength of this interaction is a function of the bond between metal ion and surface and some grafting reactions are reversible. Pt NMR showed that chloroplatinate complexes grafted on silica dissociate from the surface upon exposure to ambient humidity, in contrast with the case of alumina (Figure 4.4) [40, 67). Nongrafted chloroplatinates self-reduce into platinum dichloride and platinum metal upon thermal treatment, with an associated decrease of the metal dispersion. 

Silanes have also found use in colloid preparation. An interesting example for the use of organosilanes in the formation of organosols of transition metals is the reduction of platinum(II) complexes, especially cyclooctadieneplatinum dichloride, to colloidal platinum by trialkoxysilanes and trialkylsilanes. Hus was reported by Lewis and coworkers [60] who demonstrated that the presumably homogeneous hydrosilylation catalysts formed from platinum compounds in the presence of silanes were in fact colloidal in nature, and raised the prospect for colloid activity in many homogeneous catalyst systems (see Section 6.5). The same reduction method with organosilanes has been used for the preparation of colloids of rhodium and palladium. [61]... 

In addition Pd(II) complexes of related ligands PCH and CCH were made. All complexes with PCH ligands show monotropic nematic phase while with the CCH ligands, CCH-3 (n = 3) is not liquid crystal, CCH-5 ( = 5) is monotropic nematic and CCH-7 ( = 7) is enantiotropic nematic. Orientational order of the dimer [PtCl2(5-CB)2] formed by linking of the two cyanobiphenyl via platinum dichloride bridge, dissolved in a nematic solvent was studied using deuterium NMR spectroscopy [13]. 

Very recently, the first disulfur complexes of a tetracoordinated transition metal PtS2[P(Ar)Me2]2 (Ar=Tbt, Bbt) were synthesized by the reaction of ze-rovalent platinum complexes Pt[P(Ar)Me2]2> generated by treatment of the dichloride complexes PtCl2[P(Ar)Me2]2 with lithium naphthalenide, with elemental sulfur (Scheme 6) [37]. Since the use of excess elemental sulfur also... 

The heterobinuclear complex [PdPtCl2( -dppm)2] can also be prepared by treating the product from the reaction of dppm and [Pd(PPh3)4] with [PtCl2(NCBu,)2].76 The corresponding bromide, iodide and thiocyanate dipalladium and palladium-platinum complexes have been prepared by metathesis of the dichloride (9) with NaX.76... 

The reaction of m-bis(tricyclohexylphosphino)platinum(II)dichloride with a large excess of CH2N2 gave immediate evolution of ethylene gas. Once all the CH2N2 had been consumed, the starting complex was recovered in essentially quantitative yield. The proposed mechanism involves chloromethyl complexes (Scheme 24). 

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