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organic compounds
The structure of the title compound, C10H20FSe+.C6H2N3O7-, synthesized from (E)-4-methylseleno-5-fluoro-4-octene with trimethyloxonium tetrafluoroborate, followed by anion exchange with natrium picrate, proves the trans addition of RSeF equivalents in the fluoroselenenylation of acetylenes with XeF2-R2Se2 and XeF2-PhSeSiR3 reagents [dihedral angle Se-C4-C5-F -178.7 (1)°].