The reactions of hexakis(3,5-dimethylpyrazolyl)cyclotriphosphazene, N & (~, S -M~~P Z )~ (HPCTP) (3), with copper-(11) halides afford mononuclear HPCTP.CuX2 (X = C1,3a; X = Br, 3b) and dinuclear HPCTP.2CuX2 (X = C1, 3c; X = Br, 3d) coordination complexes. Optical absorption spectra and ESR spectra of these complexes suggest a distorted trigonal bipyramidal geometry around copper in all of the compounds 3a-3d. The structure of HPCTPCuCl2 (3a) was determined by X-ray crystallography. The crystals of 3a are monoclinic, space groupThe structure shows that the cyclophosphazene ligand functions as an unprecedented N3 capping ligand: coordination to copper is through two nongeminal pyrazolyl pyridinic nitrogen atoms and one cyclophosphazene ring nitrogen atom, and the geometry around copper is distorted trigonal bipyramidal. Cyclic voltammetric studies have been carried out on complexes 3a-3d. Experimental SectionReagents and General Procedures. The solvents were dried by heating under reflux with the appropriate drying agents: methylenedichloride and acetonitrile, P4010; benzene, P4010 or Na/benzophenone; hexane, CaH2; petroleum ether (60-80 OC), sodium metal; ether, sodium metal. The solvents were distilled and stored over molecular sieves in stoppered flasks.Hexachlorocyclotriphosphazatriene, N3P3C16, was obtained from Aldrich and purified by recrystallization from hexane. 3,SDimeth-(4) Allcock, H. R.; Nissan, R. A.; Harris, P. J.; Whittle, R. R. Orgunomerallics 1984, 3, 432. ( 5 ) Allcock, H. R.; Lavin, K. D.; Tollefson, N. M.; Evans, T. L. Orgunomerallics 1983, 2, 432. ( 6 ) Allcock, H. R.; Manners, 1.; Mang, M. N.; Parvez, M. Inorg. Chem. 1990,29, 522. (7) Allcock, H. R.; Scopelianos, A. G.; Whittle, R. R.; Tollefson, N. M. J . Am. Chem. SOC. 1983, 105, 1316. (8) (a) Gallicano, K. D.; Paddock, N. L.; Rettig, S. J.; Trotter, J. Inorg. Nucl. Chem. Leu. 1979, 15, 417. (b) Gallicano, K. D.; Paddock, N. L. Can. J. Chem. 1982,60, 521.

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Preparation and Solid-state Structural, Electronic, and Magnetic Properties of the 5-Cyano-1,3-benzene-Bridged Bis (1,2,3,5-dithiadiazolyl) and Bis(1,2,3, Along the stacking axis the mean intradimer E-E contacts are 3.12 (E = S) and 3.23 A (E = Se), while the mean interdimer E---E distances are 3.89 (E = S) and 3.91 A (E = Se). Magnetic and conductivity data are presented and discussed in light of extended Huckel band structure calculations.

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