Joining the stable: The first examples of the highly instable selenenyl fluorides RSeF are prepared from the reaction on the tin selenide RSeSnMe(3) with XeF(2). Through the use of extremely large protecting groups (m-terphenyl ligands) which stabilizes the RSeF units against disproportionation, the compounds could be isolated and characterized by NMR spectroscopy and single-crystal structure analysis (see structure).

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Unstable CH3SeI3 is prepared in two ways from dimethyl diselenide. According to its crystal structure determination it occurs as [CH3SeI2]+I– with iodine iodine contacts between the ions. The previously published [pyridineH]2+[SeI6]2– turns out as a mixture of [pydidineH]+I5–, [pyridineH+]2[I4]2–, and Se.