Structural Studies on Dimethyltin(IV) Carboxylates

Abstract

In order to correlate 119Sn Mössbauer parameters and structural data for dimethyltin(IV) derivatives, the molecular structures of bis(acetato)dimethyltin(IV) and bis(trifluoroacetato)dimethyltin(IV) were determined by single crystal X‐ray diffration. Crystals of Me2Sn(OOCCH3)2 are monoclinic, a = 26.282(4), b = 5.282(1), c = 14.434(3) Å, β = 101.17(2)°, Z = 8, space group C2/c, and those of [Me2Sn(OOCCF3)2]n are monoclinic, a = 8.444(1), b = 17.689(1), c = 15.368(1) Å, β = 93.013(9)°, Z = 8, space group Cc. The structures were solved by the Patterson method and were refined by full‐matrix least‐squares procedures to R = 0.025 and 0.027 (Rw = 0.023 and 0.030) for 2 298 and 4 182 reflections with I ≥ 3σ(F2), respectively.

Atmospheric pressure deposition of fluorine-doped SnO2 thin films from organotin fluorocarboxylate precursors

“…This contrasts with the polymeric structure adopted by the anhydrous compound, in which tin is in a six-coordinated environment. 41 The unidentate nature of the carboxylate groups is evident by the short 43 and a diorganotin derivative of a germatrane-substituted propanoic acid, 44 have been reported. However, all three structures are very different and consist of a seven-coordinate tin atom with trans-C 2 SnO 5 pentagonal bipyramidal geometry resulting from the presence of two bidentate, chelating carboxylate groups.…”

Superacid Anions: Crystal and Molecular Structures of Oxonium Undecafluorodiantimonate(V), [H3O][Sb2F11], Cesium Fluorosulfate, CsSO3F, Cesium Hydrogen Bis(fluorosulfate), Cs[H(SO3F)2], Cesium Tetrakis(fluorosulfato)aurate(III), Cs[Au(SO3F)4], Cesium Hexakis(fluorosulfato)platinate(IV), Cs2[Pt(SO3F)6], and Cesium Hexakis(fluorosulfato)antimonate(V), Cs[Sb(SO3F)6]

“…A ranking based on 119 Sn Mössbauer parameters (the isomer shift δ and the quadrupole splitting Δ E Q ) for (CH 3 ) 2 Sn 2+ derivatives of protonic acids and superacids is obviously limited to those acids that form dimethyltin(IV) salts with linear C−Sn−C skeletal groups. Where this group becomes nonlinear as e.g., in a number of dimethyltin(IV) carboxylates, the resulting asymmetry around tin reduces Δ E Q , and the suggested correlation with anion nucleophilicity fails …”

Bis[tetrakis(triphenylphosphine-κP)silver(I)] di-μ-trifluoroacetato-κ4O:O′-bis[bis(trifluoroacetato-κO)stannate(IV)]

“…tetramethylammonium triacetatodimethylstannate, which crystallizes as an air-sensitive chloroform solvate (Lockhart et al, 1987). This sole example contrasts with the numerous examples of neutral diorganotin dicarboxylates, which, with the possible exceptions of dimethyltin diformate (Mistry et al, 1990) and dimethyltin bis(tri¯uoroacetate) (Mistry et al, 1995), exist as monomeric molecules, having the chelated Sn atom in a skew-trapezoidal environment.…”

“…1). The dianion features an eight-membered 3SnÐOÐC O3SnÐOÐC O3 ring, but the carboxylate bridge [Sn2O = 2.818 (3) A Ê ] is weak and is much longer than those found in the six-coordinate polymeric parent Lewis acid [Sn2O = 2.619 (4) and 2.700 (4) A Ê ; Mistry et al, 1995]. Such a ring has only been documented previously in tetranuclear (OH) 2 (Cl 3 C-CO 2 ) 6 [Sn(C 6 H 5 ) 2 ] 4 , in which the covalent and dative SnÐO bonds [2.185 (6) and 2.361 (7) A Ê , respectively] are similar to one another (Alcock & Roe, 1989).…”