SYNTHESES AND CRYSTAL-STRUCTURES OF COMPOUNDS CONTAINING SHORT TE-N BONDS

he reaction of tellurium(IV)chloride with N-trimethylsilyl-P-triphenyliminophosphorane in a molar ratio of 1:2 gives (Ph3P = N)2TeCl2. A similar procedure with RTeCl3 (R = p-MeOC6H4) gives the monosubstituted product Ph3P = NTe(R)Cl2. X-Ray diffraction studies show that both compounds contain short Te-N bonds, with lengths of ca. 192 pm. Additional tellurium-nitrogen compounds have been obtained from reactions of RTeCl3 with Me2S(= O) = NSiMe3, (Me3SiN =)2S, and Me3SiN(Me)C-(= O)N(m-CF3C6H4)SiMe3, which give Me2S(= O) = NTe(R)Cl2, Me3SiN = S = NTe(R)Cl2, and Me activated NC(= O)N(m-CF3C6H4)Te(R)Cl, respectively.