Synthesis, complex formation and crystal structures of cyclotriphosphazenes with pyridylalkylamino groups

A variety of cyclotriphosphazenes with different numbers and types of funct ional pyridylalkylamino groups were synthesized by reactions of chlorophosp hazenes with aminoalkylpyridine derivatives and completely characterized. T he molecular structures of one multifunctional N-donor ligand, N3P3(OC6H5)( 5)(NHCH2CH2C5H4N-2) (1), was determined by X-ray structure analysis. The he xafunctionalized derivative N3P3(NHCH2CH2C5H4N-2)(6) (10) reacts with dichl oromethane to form the HCl salt (10a) the structure of which could also det ermined by X-ray crystal structure analysis. Complex formation of N3P3(OC6H 5)(5)(NHCH2C5H4N-3) (2) with cobalt(II) chloride yields the cobalt complex (2a) in which two molecules of the ligand are bonded to the tetrahedraly co ordinated cobalt atom by the pyridine nitrogen atoms The tetra functionaliz ed ligand gem-N3P3(OC6H5)(2)(NHCH2CH2C5H4N-2)(4) (8) forms the dinuclear co balt-cobaltate complex (8a) by interactions of a phosphazene nitrogen atom and the pyridine atoms of two cis-vicinal functional groups with a CoCl uni t and a pyridine group with a CoCl3-unit.