Group IV Donor Ligands

Suzuki, J. Ooyama, and M. Sakurai, Bull. Chem. Soc. Japan, 1976,49,464. 

Reduction of K2[Pd(CN)4] with potassium in liquid NH3 at — 40°C produces the diamagnetic anion [Pd(CN)2], which may be precipitated as Ba or [PRaR ] (R = Ph, R = Ph or Me) salts. At temperatures above -40 C a redox reaction occurs yielding [Pd(PR2R )4] and the unusual anion [Pd(Ph)(CN)3], which could be isolated as a phosphonium or arsonium salt. The formation constant of [Pd(CN)4] has been measured.  

Carbamoyl complexes of type [(PPh3)2MCl(C0NHCHR C02R )] (M = Pd or Pt R = Me or Et R = H or Me) are formed from the reaction of [(PPh3)2MCl2] and a-amino acid esters in the presence of CO. Treatment of [Pd2(dibenzylidene-acetone)3],CgH6 with bis-(2-arylazo)arylmercury in CeH provides (30).  

Ylide complexes [PdCl2(PPhMe2XYl)] (Y1 = Ph3AsCH2COPh, or Mej SCHCOPh) and similar Pt compounds (see p. 76) have been described. Other ylide 

COjEt R = COPh, = COPh R = Bu , R = H, R = COPh Z = As, R = Ph, R2 = H, R3 = COPh or COjMe MejSCHCOPh CsHjNCHCOPh), in contrast to the dinuclear complexes [Hg2(Ylide)2Cl4] formed with HgCl2. It was found that v(CO) for the complexes exhibits a blue shift relative to the free ylide, the values approaching those of completely protonated onium salts, indicative of coordination via the methine C atom. Similar thiocyanato-complexes showed both N and S bonding modes with N co-ordination favoured by complexes of the least basic ylides. 

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Complexes of platinum(II) with Group IV donor ligands. U. Belluco, G. Deganello, R. Pietropaolo and P. Uguagliati, Inorg. Chim. Acta, Rev., 1970, 4, 7-39 (149). 

Group IV Donor Ligands. Raman spectra of Ag liquid NH3 solutions in the presence of varying amounts of CN show two polarized bands for each of the species AgChT, [Ag(CN)2], and [Ag(CN)3] , which was interpreted as evidence for the presence of CN" linkage isomers. It was also proposed from temperature variation studies that AgCN is [Ag(NH3),CN] (y = 2 or 3). 

Group IV Donor Ligands. The ESC A and Au Mossbauer spectra of ju-bis(diethyl-phosphoniodimethylene)bis(dibromo gold) and other similar Au and Au" complexes have been reported. ... 

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