SYNTHESIS AND STRUCTURES OF ALKYNYLCHLOROCYCLOTRIPHOSPHAZENES AND THEIR CLUSTER-FORMING REACTIONS WITH OCTACARBONYLDICOBALT

摘要

Cyclotriphosphazenes having p-tolylethynyl and chloro substituents N3P3{C≡C(p-Tol)}_nCl_(6-n)(1a: n = 2, 1b: n = 4; p-Tol =p-tolyl) were synthesized by the reaction of hexachlorocyclotriphosphazene (NPCl2)3 with 2 equiv of LiC≡C(p-Tol) in THF. la and lb were characterized by spectroscopic methods and elemental analyses. The reactions of la and lb with octacarbonyldicobalt Co2(CO)8 produced cobalt clusters containing tetrahedral C2Co2(CO)6(p-Tol) cluster units; namely, tetranuclear cluster N3P3{C2Co2(CO)6(p-Tol)}2Cl4 (2) and hexanuclear cluster N3P3{C2Co2(CO)6(p-Tol)}3{C≡C(p-Tol)}Cl2 (3). Crystal structures of la and 2 were determined by X-ray crystallography.