The far infra-red spectra and bonding of some five and six coordinate complex tin ions

Organotin(IV) triazolates: Synthesis and their spectral characterization

“…Octahedral cationic [36], neutral [36,37] and anionic [38] tin(IV) complexes containing two organic residues and four electronegative ligands possess a mutually trans-geometry for the tin-carbon bonds (with a few exceptions). In this context, the magnitude of the 119 Sn Mö ssbauer Q.S.…”

Tin

“…The tin-carbon bonds therefore have an increased s-character, and transmit spin polarization more effectively by the Fermi contact mechanism. 28 The tin atom o f Me 3 SnCl, which is near-tetrahedral in C C 1 4 solution, has a hybridization close to sp 3 . In pyridine it forms a trigonal bipyramidal complex in which the SnMe 3 moiety is approximately sp 2 hybridized, and the values o f 2 J( Sn-H) increase.…”

“…In pyridine it forms a trigonal bipyramidal complex in which the SnMe 3 moiety is approximately sp 2 hybridized, and the values o f 2 J( Sn-H) increase. 28 ' 29 The magnitude o f 1 7( 119 Sn-13 C) (ca. 365 Hz) has been used to show that neopentyltin hydroxide and oxide are not associated in solution, and the two compounds have been distinguished by the absence o f 117 Sn- 119 Sn coupling in the former compound and its presence in the latter.…”

“…256 In a 1 : 2 stoichiometry, all combinations give the dicarboxylates (27). In a 1 : 1 stoichiometry Bu n 2 SnO gave the distannoxane (28), and diisobutyltin oxide gave a mixture of (27) and (28), the proportion o f (27) increasing with increased steric demand of R, that is, Me < Et < Pr 1 < Bu 1 . Di-s-butyltin oxide invariably gave only (27), together with half o f the oxide unreacted, but di-f-butyltin oxide gave the associated hydroxo-bridged hydroxide carboxylate (29).…”

Nuclear magnetic resonance spectrometry

“…NMR measurements have been taken for dimethylformamide solutions of tin(IV) chloride ( 1600), fiveand sixcoordinate complex tin ions (1601), diorganotin(IV) Schiff base complexes (1602), and other tin(IV) complexes with bidentate Schiff bases (1603). NMR studies of some trimethyltin carbamates (1604), tin(IV) complexes with MN-dialkyldithiocarbamic acids (1605), of chloro(N,IVdialkyldithiocarbamato)diorganostannanes (1606), and reactions of dibromoalkanes with dimethyltin bis(N,Ndimethylthioseleno and diselenocarbamates) and related compounds ( 1607) have been reported.…”