Heterocyclic systems containing tin(IV)—XIII [1]. Possible ceasing or inversion of the structuraltrans influence during the course of a bimolecular nucleophilic attack of a donor group in a series of SnIV rings

Organotin‐Substituted Crown Ethers for Ditopic Complexation of Anions and Cations

“…The tin atom in 4·H 2 O is pentacoordinate and adopts a distorted trigonal-bipyramidal configuration [geometrical goodness Δ(Σϑ) = 68.5°]. [26,27] The equatorial positions are occupied by C(1), C(11), C(21) and the axial positions by Cl(1) and the water oxygen atom. The tin atom is displaced by 0.22 Å from the plane defined by C(1), C(11), C (21) .…”

Triorganotin Fluoride Structures: A Ligand Close‐Packing Model with Predominantly Ionic Sn−F Bonds

“…[70] This view is supported by the solid-state structure of (Me 3 SiCH 2 ) 3 SnI, [71] which shows CϪSnϪC angles (111.7Ϫ115.2°) that are closer to those in a tetrahedral geometry. [72] Most interestingly, it appears that the intermolecular Sn···F interactions are not unambiguously reflected by the 119 Sn MAS NMR spectrum of 2, which reveals a doublet and not a doublet of doublets (see above). The latter observation further strongly supports a dynamic rather than a statistical disorder in the structure of 2.…”

“…The SnϪSn separation in the infinite chain of tin atoms is 5.564(2) Å , and the pairs of SnϪCl distances are 2.508(9)/ 3.056(9) and 2.498(10)/3.066(10) Å . [72] The geometrical goodness ∆Σ(θ) of the respective tin atoms is 54.45°(Sn1) and 70.02°(Sn1Ј). [67,68] …”

Tributyl- and Triphenyltin Benzoates, Phenylacetates, and Cinnamates as Anion Carriers: an Electrochemical Assessment Coupled to Structural NMR Studies and AM1 Calculations

“…In the case of carrier 7, the unusually low four-coordination of the Sn-atom indicates an abnormally low Lewis acidity, being closer in this respect to tributyltin than to triphenyltin compounds. That the nucleophilic attack at a four-coordinate species is slower than at a five-coordinate one (higher LUMO energy) corroborates this idea [29]. With the apparent lower potential difference, the triorganotin perfluorobenzoates 4 (R Bu) and 10 ( R Ph) within their Bu and Ph series, respectively, are expected to have the highest Lewis acidity as a result of the proximity of the strongly electronwithdrawing pentafluorophenyl group.…”