Simplicity meets beauty. Trapping molecular dimethyltin oxide in the novel organotinoxo cluster [MeN(CH_2CH_2O)_2SnMe _2·Me_2SnO]_3

摘要

The syntheses are reported of the 1,1,5-trimethyl-2,8-dioxa-5-aza-1- stannabicyclo[3.3.0]octane MeN(CH_2CH_2O) _2SnMe_2 (1), its monosodium aminoalcoholate adduct [MeN(CH_2CH_2O)_2SnMe_2· MeN(CH_2CH_2ONa)(CH_2CH_2OH)] _2 (2), and the hexanuclear organotin oxo cluster [MeN(CH _2CH_2O)_2SnMe_2·Me _2SnO]_3 (3). The compounds were characterized by ~1H, ~(13)C, and ~(119)Sn NMR spectroscopy, electrospray ionization mass spectrometry, and single-crystal X-ray diffraction analysis. In the solid state, compound 1 is a tetramer that is brought about by intermolecular O→Sn interactions. In solution, however, it shows a monomer a? dimer equilibrium that is fast on the ~1H, ~(13)C, and 119Sn NMR time scales at room temperature. All compounds show intramolecular N→Sn interactions at Sn-N distances ranging between 2.378(3) ? (2) and 3.026(3) ? (3·0.25H_2O). Compound 3 can formally be regarded as a molecular dimethyltin oxide being trapped by head-to-tail complexation with a stannabicyclooctane. In solution, it slowly falls apart into 1 and Me_2SnO.