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Transition metal complexes with amidinato ligands: the ubiquitous tris-chelated structural motif

1996; Elsevier BV; Volume: 242; Issue: 1-2 Linguagem: Inglês

10.1016/0020-1693(95)04846-4

1873-3255

F.Albert Cottona, L.M. Daniels, David J. Maloney, C.A. Murillo,

Organometallic Complex Synthesis and Catalysis

The syntheses, crystal and molecular structures of eight transition metal compounds possessing ligands of the type [(p-tol)NC(H)N(p-tol)]− (DTolF), [(phenyl)NC(H)N(phenyl)]− (DPhF), and the corresponding triazenato ligands [(phenyl)NNN(phenyl)]− (DPhTA) are presented. Common to all of the compounds is a homoleptic tris-chelated structure with virtual D3 symmetry. Crystallographic data for the compounds are as follows: Cr(DPhF)3·tol (1), monoclinic, C2c with a = 21.015(3) Å, b = 15.925(2) Å, c = 12.896(1) Å, β = 116.628(8)° and Z = 4; Cr(DTo1F)3 (2) and Fe(DTolF)3 (4), monoclinic, C2c with a = 12.654(2), 12.725(4) Å b = 33.393(2), 33.440(7) Å, c = 9.273(2), 9.281(1) Å, β = 94.17(2), 93.80(2)° and Z = 4, respectively; Fe(DPhF)3 (3), orthorhombic, Pccn with a = 10.902(2) Å, b = 18.539(3) Å, c = 16.412(3) Å and Z = 4; Ru(DTolF)3·0.57C6H14 (5) and Co(DTolF)3·0.56C6H14 (6), trigonal, R3− with a = 14.353(4), 14.100(2) Å, c = 35.51(2), 36.340(8) Å and Z = 6, respectively; Fe(DPhTA)3·tol (7), monoclinic, I2a with a = 13.265(4) Å, b = 16.182(2) Å, c = 17.855(5) Å, β = 99.53(1)° and Z = 4; [Li(THF)4][Fe(DPhTA)3] (8), orthorhombic, Pbcn with a = 13.527(1) Å, b = 17.827(2) Å, c = 20.702(2) Å and Z = 4.