THE COORDINATION CHEMISTRY OF 4'-PHENYL-2,2'-6',2''-TERPYRIDINE - THE SYNTHESIS, CRYSTAL AND MOLECULAR-STRUCTURES OF 4'-PHENYL-2,2'-6',2''-TERPYRIDINE AND BIS(4'-PHENYL-2,2'-6',2''-TERPYRIDINE)NICKEL(II) CHLORIDE DECAHYDRATE

The convenient preparation and the structural characterisation of the terdentate ligand 4'-phenyl-2,2':6',2"-terpyridine (crystallographic data: space group Pbcn, a = 11.801(1), b = 12.177(3), c = 10.976(3) angstrom, Z = 4, 1192 reflections with F greater-than-or-equal-to 3-sigma(F), R = 0.0556) is described. The three pyridyl rings adopt approximately planar transoid configurations about the interannular C-C bonds, whilst the phenyl ring adopts an angle of 10.9-degrees with respect to the central pyridyl ring. A range of 1:1 and 2:1 complexes of this ligand with transition metals has been prepared, and the compound [NiL2]Cl2.10H2O (L = 4'-phenyl-2,2':6',2"-terpyridine) has been structurally characterised (crystallographic data: space group P1BAR, a = 10.340(2), b = 12.690(2), c = 19.822(4) angstrom, Z = 2, 5926 reflections with F greater-than-or-equal-to 4-sigma(F), R = 0.0583). The complex possesses a distorted octahedral structure with two approximately planar terdentate L ligands; the phenyl groups now adopt angles of almost-equal-to 17-degrees with respect to the central pyridyl rings.