METAL-COMPLEXES OF CHIRAL PYRIDINE LIGANDS - X-RAY STRUCTURE OF RATOBIS(2-[(2S)-2-PYRROLIDINYL]PYRIDINE)COPPER(II) NITRATE

Cobalt(II), nickel(II), and copper(II) complexes of 2-[(2S)-2-pyrrolid inyl]pyridine (L) have been synthesized and characterized. The crystal structure of the complex [Cu(L)2(NO3)]NO3 has been determined by X-ra y diffraction. Crystals are monoclinic, space group P2+, with a = 10.7 66(3), b = 7.525(2), c = 13.447(4) angstrom, beta = 104.64(2)-degrees, and Z = 2. The structure consists of [Cu(L)2(NO3)]+ cations and NO3- anions. The copper atom has a distorted trigonal bipyramidal coordinat ion geometry with the two pyrrolidine nitrogens and one nitrate oxygen occupying the equatorial positions and the two pyridine nitrogens at the apices. The crystalline cohesion is ensured by a network of hydrog en bonds involving the pyrrolidine groups as donors and both coordinat e and uncoordinate nitrates as acceptors.