Selenium tetrachloride complexes

The selenium-containing complex 72b has been used to prepare a variety of new heterocycles containing both selenium and germanium. For example, reaction with dichlorodiphenylgermanium and germanium tetrachloride gives 76 and 77, respectively (Scheme 8).56... 

Several hexachloro, hexabromo and hexaiodo complexes of the group VIB elements have been reported. For example, solutions of selenium tetrachloride in concentrated hydrochloric acid contain the hexachloro anion SeCli from which the ammonium and alkai metal salts can be readily obtained with the cesium salts being the least soluble. The... 

A number of hexahalogenotellurates(IV) have been investigated. A few rather unstable hexafluoro complexes are known, for example the nitrosonium compounds of composition (NO)2XF6 have been obtained40 from the reaction of nitrosulfuryl fluoride, NOS02F, with selenium or tellurium tetrachloride. The selenium compound loses nitrosyl fluoride at room temperature to leave the pentafluoroselenate(lV), whereas the tellurium analogue remains... 

McCullough, J.D. and Zimmermann, I.C. (1961) Thermodynamic studies of the iodine complexes of the five sulfur and selenium analogs of 1,4-dioxane in carbon tetrachloride solution. J. Phys. Chem., 65, 888-889. 

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