Synthesis, structure and metallation of spiro-N 3P 3(O 2C 12H 8)(OC 5H 4N-2) 4: A heptacoordinate Co(II) in the molecular structure of N 3P 3(O 2C 12H 8)(OC 5H 4N-2) 4 · Co(NO 3) 2

Abstract

Spiro-N 3P 3(O 2C 12H 8)(OC 5H 4N-2) 4 ( L) is an efficient multi-site coordination ligand which binds with transition metal ions to afford the mononuclear complexes [LCu(NO 3) 2], [LCo(NO 3) 2] and [LZnCl 2]. In [LCu(NO 3) 2] the copper atom is six-coordinate with the cyclophosphazene ligand coordinating to the metal ion through one skeletal ring nitrogen atom and two nitrogen atoms of geminal pyridyloxy substituents in a η 3- gem-N 3 mode. The two nitrate ligands provide monodentate as well as chelating coordination. In [LCo(NO 3) 2] the coordination geometry around Co(II) is pentagonal bipyramidal with a 3N, 4O coordination environment. The cyclophosphazene ligand binds to the metal ion in a η 3- non-gem-N 3 mode. The two nitrate ligands function as chelating ligands and complete the coordination around cobalt. The coordination response of L in the complex [LZnCl 2] is also η 3- non-gem-N 3. Two chloride ligands complete the coordination environment around zinc.