PALLADIUM(II) COMPLEXES OF N-SULFONYLAMINO ACIDS .1. SOLID-STATE BEHAVIOR OF BINARY AND TERNARY 2,2'-BIPYRIDINE-CONTAINING SYSTEMS

The crystal and molecular structure of the complexes K-2[Pd(bs-alpha-alaNO)(2)]3.5H(2)O 1, [Pd(tsglyNO)(bipy)] 2 2 and [Pd(bs-beta-alaNO)(bipy)]. H2O 3 were determined by X-ray diffraction (bs-alpha-alaNO = phenylsulfonyl-DL-alpha-alaninate dianion; tsglyNO = N-p-tolylsulfonylglycinate dianion; bipy = 2.2'-bipyridine; bs-beta-alaNO = N-phenylsulfonyl-beta-alaninate dianion). Compound 1 crystallizes in the triclinic space group $$($) over bar P1 with a = 13.457(3), 6 = 9.855(2), c =10.739(2) Angstrom, alpha = 104.0(1). beta = 100.8(1), gamma = 78.0(1)degrees. Z = 2. The Pd atom has a square-planar-environment, being trans co-ordinated by two centrosymmetrically related ts-alpha-alaNO dianions acting in a bidentate manner through one carboxylic oxygen and the deprotonated sulfonamide nitrogen. Compound 2 crystallizes in the monoclinic space group P2(1)/c with a = 12.210(1), b = 6.897(3), c = 21.449(2) Angstrom, beta = 95.55(1)degrees. Z = 4. Compound 3 crystallizes in the monoclinic space group Pc, with a = 8.320(5), 6 = 14.403(3), c = 8.477(4) Angstrom, beta = 101.81(4). Z = 2. Both complexes contain a Pd2+ ion co-ordinated to the N atoms of the bipy molecule and to the deprotonated sulfonamide nitrogen and one carboxylic oxygen of the amino acid molecule in a square-planar geometry. The amino acid dianion forms a five-membered glycine-like chelate ring in 1 and 2, and a six-membered ring in 3. infrared data are also discussed and compared with those of the free ligands and the corresponding binary complexes.