Synthesis and spectroscopic characterization of 1,2-bis(trimethylsilyl)-1,2-dicarba-closo-hexaborane(6) derived from closo-stannacarborane and the x-ray crystal structure of the precursor 1-Sn-2,3-[Si(CH3)3]2-2,3-C2B4H4

DFT studies of the σ-donor/π-acceptor properties of [SnCB10H11]– and its relationship to [SnCl3]–, CO, PF3, [SnB11H11]2–, SnC2B9H11, and related SnC2BnHn+2 compounds

“…Molecular structures of dicarbastannaboranes with n = 4 and n = 10 have been structurally characterised (13,15,18,22) and optimised geometries for each system are in very good agreement with experimental data (Table 1). The crystallographically determined molecular structures of the supraicosahedral stannacarboranes, 4,1,6-SnC 2 B 10 H 12 and 1,6-Me 2 -4,1,6-SnC 2 B 10 H 10 , contain asymmetrical geometries in the solid state which are in excellent agreement with optimized 'gas-phase' calculated geometries, as shown in Table 1 for the Sn-C and Sn-B bond lengths in 1,6-Me 2 -4,1,6-SnC 2 B 10 H 10 (22).…”

“…While only one cage geometry of each of the closo systems, the [SnB n H n ] 2-dianions and the [SnCB n H n+1 ] -anions, is known, there are many different geometries of SnC 2 B n H n+2 clusters with n = 4, 8, 9 and 10 reported in the literature (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24). Molecular structures of dicarbastannaboranes with n = 4 and n = 10 have been structurally characterised (13,15,18,22) and optimised geometries for each system are in very good agreement with experimental data (Table 1).…”

“…The lack of -donating ability of the SnC 2 B 4 H 6-n R n systems was ascribed to the diffuse nature of the exo-polyhedral lone-pair on the tin center (19) and to the symmetric electron distribution in some of the lower lying filled M.O.s which the authors associated with the Sn 'lone pair' (15 -, a stronger -donor and weaker -acceptor than CO or PF 3 . We also report the shapes, energies and atomic compositions of the orbitals for these systems as well as for related dicarbastannaboranes (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24).…”

Chemistry of C-Trimethylsilyl-Substituted Heterocarboranes. 25. Syntheses, Structures, and Reactivities of GeCl3-Substituted Half-Sandwich Germacarboranes, closo-1-Ge-2-(SiMe3)-3-(R)-5-(GeCl3)-2,3-C2B4H3 (R = SiMe3, Me, and H)

“…While the identities of the reduction products (IV-VI) is wellestablished, the identities of the accompanying oxidation products are not known. Since the reaction of the stannacarboranes with the metal halides PtCl 4 and PtCl 2 leads to oxidative closure of the carborane cage to give the corresponding closo-carboranes and Pt metal 28 and NiCl 2 is known to react in a similar fashion with the group 1 compounds of these carboranes, 29 closocarborane formation was thought to be a likely coproduct of the germanium insertion. However, there is no evidence of the formation of a closo-carborane among the products in the synthesis of IV.…”

Tin Organometallic Compounds: Classification and Analysis of Crystallographic and Structural Data: Part 1. Monomeric Derivatives

“…Only twelve of these compounds have tin in oxidation state (+2) [300,301,[309][310][311][312][360][361][362][363][364], the rest are Sn(IV) compounds. As in the earlier cases, there are situations in which additional atoms or ligands are close enough to interact with the tin atom.…”