(TERPYRIDINE)PALLADIUM(II) COMPLEXES OF PHENYLCYANAMIDE LIGANDS

Terpyridine-palladium(II) complexes of phenylcyanamide anion ligands h ave been prepared and characterized by UV-vis, IR, and H-1-NMR spectro scopies. A crystal structure determination of the complex [Pd(terpy)(2 ,6-Cl-2- pcyd)][PF6] has been performed. The overall geometry of the c omplex is approximately planar with a dihedral angle of 2.16(16)degree s between the best plane fit of the palladium coordination sphere and that for the phenyl ring of the phenylcyanamide ligand. Crystal struct ure data for the complex: C22H14N5Cl2PF6Pd, monoclinic crystal system and space group P2(1)/n, with a=8.185(5)Angstrom, b=13.606(7)Angstrom, c=21.163(5)Angstrom,beta=90.50(3)degrees, V=2356.8(20) Angstrom(-3), and Z = 4. The structure was refined by using 3233 Mo K alpha reflecti ons with I > 2.5 sigma(I) to an R factor of 0.034. The UV-vis spectra of the complexes showed a broad band centered at approximately 400 nm which has been assigned to a pi(nb) --> sigma LMCT transition of the Pd(II)-NCN chromophore.