Syntheses, structures and ligand conformations of Cu(II), Co(II) and Ag(I) complexes containing the phosphinic amide ligands

Abstract

The syntheses, structures and ligand conformations of the complexes trans-Cu( L1) 2(ClO 4) 2, ( L1 = N-(2-pyrimidinyl)- P, P-diphenyl-phosphinic amide), 1, [ trans-Co( L1) 2(CH 3OH) 2](ClO 4) 2·O(C 2H 5) 2, 2, [ trans-Co( L2) 2(H 2O) 2](ClO 4) 2·2CH 3OH, ( L2 = N-(2-pyridinyl)- P, P-diphenyl-phosphinic amide), 3, [ cis-Co( L2) 2(NO 3)](NO 3), 4, and [Ag( L3)(NO 3)(CH 3CN)] ∞, ( L3 = N-(6-methyl-2-pyridinyl)- P, P-diphenyl-phosphinic amide), 5, are reported. The L1 and L2 ligands in the monomeric complexes 1– 4 chelate the metal centers through the pyrimidyl/pyridyl nitrogen atoms and the phosphinic amide oxygen atoms, whereas the L3 ligands in complex 5 bridge the metal centers, forming a 1-D zigzag chain. The chelating L2 ligands in complexes 3 and 4 adopt cis conformations and the bridging L3 ligand in complex 5 adopts a trans conformation, respectively.