Niedermolekulare diorganozinn-sauerstoff-verbindungen: di-t-butyl- und di-t-amylzinnoxid

Hexakis(2,4,6-triisopropylphenyl)cyclotristannoxane - a Molecular Diorganotin Oxide with Kinetically Inert Sn-O Bonds

“…As a result of the bulky 2,4,6-triisopropyl ligands, the tin atoms exhibit distorted tetrahedral geometries. The mean O±Sn±O angle in 1 amounts to 104.4(1)°, which is close to the corresponding angles in cyclot-Bu 2 SnO) 3 (106.9(2)°), [4] 3 (114.8°) [6] but somewhat smaller than those values reported for cyclo-(t-Bu 2 SnO) 3 (119.5(4)°), [4] cyclo-[(EtMe 2 C) 2 [5] and cyclo-{[(Me 3 Si) 2 CH] 2 SnO} 2 (119.9(9)°) [12]. The mean Sn±O±Sn angle in 1 amounts to 136.1(2)°which is close to the Sn±O±Sn angles reported for cyclo-(t-Bu 2 SnO) 3 [5] but bigger than the angles found for cyclo-[(2,6-Me 2 ±C 6 H 3 ) 2 SnO] 3 (120.8°) [6] and cyclo-[(Me 3 SiCH 2 ) 2 SnO] 3 (122.4(2)°) [2].…”

“…The 119 Sn NMR spectrum (CDCl 3 ) of 1 shows one signal at ±128.6 ppm being almost identical to the 119 Sn MAS NMR chemical shift mentioned above and very close to the 119 Sn NMR chemical shift reported for cyclo-[(2,6-Et 2 ±C 6 H 3 ) 2 -SnO] 3 (±125.0 ppm) [7]. Interestingly, the 2 J( 119 Sn± O± 117 Sn) coupling of 501 Hz is significantly bigger as compared to the corresponding coupling in the closely related diaryltin oxide cyclo-[(2,6-Me 2 ±C 6 H 3 ) 2 SnO] 3 (320 Hz), [27] as well as in cyclo-(t-Bu 2 SnO) 3 (369 Hz), [4] cyclo-[(Me 2 EtC) 2 SnO] 3 (394 Hz), [4] and cyclo-[(Me 3 SiCH 2 ) 2 SnO] 3 (335 Hz) [2]. This difference, especially in comparison with cyclo-[(2,6-Me 2 ± C 6 H 3 ) 2 SnO] 3 having an almost identical substituent pattern at tin, is likely to originate from the well established dependence of the 2 J( 119 Sn±O± 117 Sn) coupling from the Sn±O±Sn bond angle [27,28] and suggests this angle in compound 1 and in cyclo-[(2,6-Me 2 ±C 6 H 3 ) 2 SnO] 3 to be even more different in solution than in the solid state.…”

“…Depending on the steric demand of the organic substituents they are either polymeric (I, R = Me, Et, Bu, Vinyl, Ph) [1] or trimeric (II, R = CH 2 SiMe 3 , [2] t-Bu, [3,4] Me 2 EtC, [4] (Me 3 Si) 3 C/ Me, [5] 2,6-Me 2 ±C 6 H 3 , [6] 2,6-Et 2 ±C 6 H 3 , [7] 2,4,6-(CF 3 ) 3 ±C 6 H 2 ) [8]. While the six-membered ring structure of the latter compounds, (II), was established by X-ray diffraction studies, the polymeric nature of the former group, (I), was deduced from their virtual insolubility in common organic solvents, 119 Sn Mo È ûbauer, [9,10] and 119 Sn MAS NMR spectroscopy [11] revealing the presence of pentacoordinated tin atoms within these compounds (Chart 1).…”

The Isoelectronic Replacement of E = P+ and Si in the Trinuclear Organotin−Oxo Clusters [Ph2E(OSntBu2)2O·tBu2Sn(OH)2]

“…[20] 4 . The solid-state NMR spectra were measured using the same instrument equipped with a 4 mm MAS probe.…”

Luminescence and Electrochemical Properties of Organostannoxane Coordination Polymer Based on Ferrocenyl-2-Cyano Carboxylate Ligand

“…The singlet at 4.60 and 4.91 ppm are assigned to substituted cyclopentadienyl ring protons. The singlet at 8.09 ppm is due to the (N≡C=CH) protons [12]. The two doublets at 7.42 ppm were observed due to the aliphatic methyl protons.…”