A novel coordination mode for a pyridylphosphine ligand. X-ray structures of [RuCl2(NO)L] (I) and [RuCl2(NO)L]center dot DMSO (II) (L = [(2-py)(2)PC2H4POO(2-py)(2)](-))

The ruthenium(II) complex, [RuCl2(NO)L] (I), (L = [(2-py)(2)PC2H4PO2(2-py)] (-)) was obtained from recrystallization of RuCl3NO(d2pype) (d2pype = (2-py )(2)PC2H4P(2-py)(2)) in the presence of HNO3, crystallizing in the monoclin ic space group P2(1) (no. 4), with a = 8.012(4) Angstrom, b = 14.454(4) Ang strom, c = 9.353(3) Angstrom, beta= 105.77(3)degrees, and Z = 2. Crystals o f the DMSO solvate of the complex (II) were obtained from (CD3)(2)SO soluti on, crystallizing in the monoclinic space group P2(1)/c (no.14) with a = 9. 7080(2) Angstrom, b = 22.2920(5) Angstrom, c = 11.5230(3) Angstrom, alpha = 92.0450(10)degrees, and Z = 4. In both complexes, the geometry about the r uthenium atom is a distorted octahedron mainly as a result of the tridentat e [P,N,O]-bonding modeof L. The nu (NO) bands at 1875 cm(-1) in both comple xes are consistent with the linear disposition of the NO group and the Ru a tom as is observedin the X-ray crystal structure (Ru-N1-O1 angle = 178.5(4) degrees).