Synthesis and coordination properties of 6,6′-bis(diphenylphosphinomethyl)-2,2′-bipyridine- N, N′, P, P′-tetraoxide

• Published in: Inorganica Chimica Acta Vol. 247; no. 1; pp. 29 - 34
• Main Authors: Gan, X., Duesler, E.N., Paine, R.T., Smith, P.H.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.06.1996
• Subjects: Chelate complexes; Crystal structures; Lanthanide complexes; Polydentate ligand complexes; Crystal structures; Chelate complexes; Lanthanide complexes; Polydentate ligand complexes
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/0020-1693(95)04830-8

The ligand 6,6′-(bis(biphenylphosphinomethyl)-2,2′-bipyridine- N, N′, P, P′-tetraoxide ( 7) is prepared by oxidation of the parent phosphine 6,6′-bis(diphenylphosphinomethyl)-2,2′-bipyridine ( 10). Combination of the oxidized ligand with lanthanide nitrates Ln(NO 3) 3·(H 2O) n (Ln = La, Pr, Nd, Dy, Er) results in formation of 2:1 metal:ligand complexes, and the molecular structure of one complex, [Nd( 7) 2](NO 3) 3·[(CH 3) 2NC(O)H] 2, is described. The compound crystallizes in the monoclinic space group C2/ c with a = 20.617(4), b = 22.736(6), c = 18.465(3) A ̊ , β = 98.35(1)° and Z = 4 . The molecular structure confirms the bis-ligands stoichiometry and shows that the two ligands are tetradentate. The Nd coordination number is eight, and the NO 3 − ions and solvent molecules are not involved in inner sphere coordination.