METALATION OF THE ACYCLIC PHOSPHAZENE LIGAND HN[P(NME2)2NSIME3]2 - SYNTHESIS AND CRYSTAL-STRUCTURE OF (NAN[P(NME2)2NSIME3]2)2, (KN[P(NME2)2NSIME3]2)INFINITY AND CA(N[P(NME2)2NSIME3]2)2

The reaction of HN[P(NMe2)2NSiMe3]2 with NaH and KH in 1:1 molar ratio yielded a dimer {NaN[P(NMe2)2NSiMe3]2}2 1 and a polymer KN[P(NMe2)2NS iMe3]2 2 with a zigzag chain structure, respectively. The reaction of Ca[N(SiMe3)2]2.2thf (thf = tetrahydrofuran) with the phosphazene in 1: 2 molar ratio in hexane resulted in the formation of a monomeric spiro cyclic phosphazene complex Ca(N[P(NMe2)2NSiMe3]2}2 3 where the mode of chelation is tridentate. The crystal structures of 1-3 have been dete rmined.