SYNTHESIS AND CHARACTERIZATION OF POLY(ETHYNYLTRIMETHYLSILANE) CONTAINING PD(II) COORDINATION SITES

The polymerization of ethynyltrimethylsilane with {Pd[C = C-Si(CH3)(3) )](2)(PPh(3))2} in different complex: monomer ratios has been investig ated. Polymers containing Pd(II) have been isolated and characterized by means of X.p.s. and FT i.r. measurements. The insoluble polymers ob tained contain Pd sites that are sigma-bonded to the pi-conjugated gro wth chain and coordinated to the C = C bonds of adjacent chains in a c rosslinked structure. The soluble polymers isolated have a linear stru cture where Pd(II) coordinates through sigma-bonds to the polymeric ch ains and to OPPh(3) ligands. If NHEt(2) is used as the polymerization solvent, substitution of Si(CH3)(3) by N(C2H5)(2) groups occurs, catal ysed by the Pd complex. Comparison of the X.p.s. and g.p.c. measuremen ts and elemental analyses give an estimation of the number of monomer repeat units for every Pd atom. (C) 1996 Elsevier Science Ltd.