Adina Rotar

Substitutional disorder in a hypervalent diorganotin(IV) dihalide

The structure of bromidochloridobis[2-(dimethylaminomethyl)phenyl]tin(IV), [SnBr0.65Cl1.35(C9H12N)2], contains two 2-(Me2NCH2)C6H4 units bonded to a Sn atom which lies on a twofold axis. The compound exhibits substitutional disorder of the halide atoms bonded to the Sn, with 1.35 occupancy for Cl and 0.65 for Br; it is isomorphous with the corresponding dichloride. The Sn atom is hexacoordinated with a (C,N)2SnX 2 (X = Cl/Br) distorted octahedral core as a result of the strong intramolecular N→Sn coordination trans to the Sn—X bonds (N1—Sn1—X1 = 165.8°). As a result of the intermolecular contacts, viz. H⋯X and H⋯benzene interactions, the molecules are arranged in a three-dimensional supramolecular manner in the crystal structure.

Butyl­trichlorido{2-[(diisopropyl­ammonio)­meth­yl]phen­yl}tin(IV) dichloro­methane monosolvate

The title compound, [Sn(C4H9)(C13H21N)Cl3]·CH2Cl2, was obtained by recrystallization of [2-(diisopropylaminomethyl)phenyl]tin(IV) butyl dichloride from a CH2Cl2/n-hexane mixture (1:4 v/v) in the presence of ambient moisture. Partial hydrolysis led to the title compound, the hydrochloric acid adduct of the dichloride, having a pentacoordinated Sn atom with a trigonal–bipyramidal C2SnCl3 core. The N atom of the 2-[(diisopropylammonio)methyl]phenyl ligand forms a strong intramolecular N—H⋯Cl hydrogen bond, resulting in a zwitterionic species, [2-(iPr2HN+CH2)C6H4]SnBuCl3 −·CH2Cl2. Disorder was found in the n-butyl group, which was refined as disordered over three positions, with site occupancies of 0.22 (1), 0.51 (1) and 0.27 (2).

Crystal and molecular structure of potassium 18-crown-6-[2,6-bis(dimethylaminomethyl)phenyl]tin(IV) tetrafluoride

Abstract The crystal structure of the title compound shows the [K(18-crown-6)]+ cation and [{2,6-(Me2NCH2)2C6H3}SnF4]– anion, which are held together through two potassium–fluorine and one potassium–tin electrostatic interaction. The tin atom is hexacoordinated by one carbon and four fluorine atoms, and an intramolecular N→Sn interaction. It has a distorted octahedral configuration. Electrostatic interactions between two fluorine atoms and hydrogen atoms from two different cation–anion pairs generate a double-chain polymeric supramolecular structure, containing both isomers.