Tellurium Diazides

Stirring a mixture of tetrahydrotellurophene or tellurane 1,1-diiodide in acetone with sodium azide at 20°, filtering the mixture, and concentrating the filtrate under vacuum, yielded the 1-telluracycloalkane 1,1-diazides. These azides were reported to be stable to shock.  

Cyanate, thiocyanate, and selenocyanate groups can be linked to tellurium via the chalcogen atom or via the nitrogen atom. The v(C-X) infrared absorption bands have been used to distinguish between these two bonding modes. The iso (N-bonded) organic cyanates, R-NCX, have v(C-X) at higher wave numbers than the normal (X-bonded) compounds, R-XCN. 

All tellurium derivatives with exception of the diorgano tellurium diselenocyanates have infrared absorption bands in the regions that would indicate N-Te bonding. The frequencies for v(C-Se) in the diorgano tellurium selenocyanates (598 cm ) fall between the frequencies for organic isoselenocyanates (630 20 cm and those for normal selenocyanates (550-520 cm ). 

These guidelines for distinguishing between normal and iso compounds, developed for compounds in which the pseudohalogens are bonded to carbon, might not be reliable when the pseudohalogens are bonded to the heavy tellurium atom. Molecular structures are not available for diorgano tellurium dipseudohalides. 

Because of the uncertain constitution of the diorgano tellurium dipseudohalides, the names and formulae in the following sections do not intend to give information about the manner in which the pseudohalogens are bonded to tellurium. 

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As novel halides-pseudohalides of a tetravalent chalcogen, tellurium trichloride azide, ClaTeNa, and tellurium dichloride diazide, CI2-Te(Na)2, were prepared from CH2CI2 solutions of TeCU and trimethyl-silyl azide according to... 

Two mixed Te(IV) azides are known, namely, tellurium trichloride azide, Cl3TeN3 [332], and tellurium dichloride diazide, Cl2Te(N3)2 [333]. Both compounds melt near 60°C and explode on heat shock and impact. The diazide is the less stable of the two, exploding at 130°C and, at times, spontaneously at room temperature. The compounds are made at room temperature by reacting tellurium tetrachloride with trimethylsilyl azide in dichloromethane media... 

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