STABLE STANNANESELONE AND DISELENASTANNIRANE - NOVEL ORGANOTIN COMPOUNDS DERIVED FROM AN EXTREMELY HINDERED TETRASELENASTANNOLANE

The first kinetically stabilized stannaneselone, Tbt(Ditp)Sn=Se (Tbt = 2,4,6-tris [bis(trimethylsilyl)methyl]phenyl; Ditp = 2,2''-diisopropy l-m-terphenyl-2'-yl), with a tin-selenium double bond and a stable dis elenastannirane, Tbt(Ditp)SnSe2 were synthesized by deselenation of th e corresponding tetraselenastannolane, Tbt(Ditp)SnSe4 with 3 equiv. an d 2 equiv. triphenylphosphine, respectively. The X-ray structural anal ysis of the stannaneselone revealed that it has a trigonal planar stru cture with the Sn-Se bond length of 2.375(3) Angstrom, which is approx imately 9% shorter than that of the corresponding single bond and the shortest among Sn-Se bond lengths so far reported. The molecular struc ture of diselenastannirane determined by X-ray analysis shows that it has an unusually long Se-Se bond (2.524 Angstrom), about 0.2 Angstrom longer than a typical Se-Se single bond.