Syntheses and molecular structures of pentaphenoxy‐2‐, 3‐, and 4‐pyridylmethoxycyclotriphosphazene and their copper(II) nitrate complexes

The reactions of monochloropentaphenoxycyclotriphosphazene with the sodium salts of 2‐, 3‐, and 4‐pyridylmethanol yield the pentaphenoxy‐2‐, 3‐, and 4‐pyridylmethoxycyclotriphosphazenes 1, 2, and 3, respectively. The X‐ray structure analysis of 1 shows that the molecule consists of a nearly planar six‐membered PN ring. Complexation reactions of 1, 2, and 3 with copper(II) nitrate yield the compoundsN3P3(OC6H5)5OCH2(2‐C5H4N)]2Cu(NO3)2 (4), N3P3‐(OC6H5)5OCH2(3‐C5H4N)]2Cu(NO3)2 (5), and N3P3‐(OC6H5)5OCH2(4‐C5H4N)]2Cu(NO3)2 (6), respectively. The molecular structures of 4 and 5 were determined by X‐ray crystallography. Compound 4 shows a square‐planar geometry around the copper ion with the pyridine nitrogen and one of the nitrate oxygen atoms forming the plane. In 5, the copper ion is octahedrally surrounded by the pyridine nitrogen atoms and two nitrate groups as asymmetrical bidentate chelating ligands. © 1999 John Wiley & Sons, Inc. Heteroatom Chem 10: 9–15, 1999