SUBSTITUTION OF NITRIDO BY THE OXO GROUP IN REACTIONS OF [RENCL2(PPH(3))(2)] WITH MULTIDENTATE N,O--DONOR CHELATES - CRYSTAL-STRUCTURE OF [REOCL2(PPH(3))(HL)] [H(2)L=2,6-BIS(HYDROXYMETHYL)PYRIDINE]

The complex [ReNCl2(PPh(3))(2)] reacts with the potentially bidentate 8-hydroxyquinoline (Hquin) and N-phenylsalicylideneimine (Hpsal), and potentially terdentate ligands di-2-pyridyl ketone and 2,6-bis(hydroxy methyl) pyridine (H(2)L) to form the products [ReOCl(quin)(2)], [ReOCl 2(PPh(3))-(psal)], [ReOCl2{(C5H4N)(2)C(O)(OH)}] and cis-[ReOCl2(PPh(3) )(HL)], respectively. The first three products are identical to those isolated earlier by the reactions of trans-[ReOCl3(PPh(3))(2)] with th ese ligands, while in the latter product the HL(-) ligand acts as a bi dentate N,O--donor, spanning one axial (O- trans to Re=O) and one equa torial co-ordination site. These reactions present an alternative synt hetic route to monooxorhenium(V) complexes. The complex cis-[ReOCl2(PP h(3))(HL)] crystallizes in the orthorhombic space group P2(1)2(1)2(1) with cell parameters a = 10.019(3), b = 12.457(6), c = 19.53(1) Angstr om, U = 2436.5 Angstrom(3), Z = 4. R = 0.059 and R' = 0.074 for 1330 r eflections with F-o > 4 sigma(F-o).