Preparation, infrared and 13C and 119Sn NMR spectral studies of triorganotin(IV) derivatives of N-acetyl-l-phenylalanine and N-acetyl-l-phenylalanylglycine

Synthesis, structural and larvicidal studies of some triorganotin 2-(p-chlorophenyl)-3-methylbutyrates

“…As can be seen in Table 4, the 1 J( 119 Sn-13 C) coupling constants range from 338 Hz to 397 Hz for the alkyl compounds and 642 Hz for the triphenyltin derivative. These values are consistent with values for similar compounds [22,[24][25][26]. In addition, a C-Sn-C bond angle of 111.6°was calculated using the 1 J( 119 Sn-13 C) coupling constant of 397 Hz for the methyl derivative [21] supporting the previous assignment of a four-coordinated geometry for this compound.…”

Syntheses, characterizations, and crystal structures of organotin(IV) chloride complexes with 4,4′‐bipyridine

“…The spectra of (1) is also consistent with an essentially pyramidal arrangement of phenyl groups, the asym and sym Sn C being observed at ca 277 and 229 cm −1 , respectively. The appearance of only a single Sn C band in the spectra of diakyltin(IV) complexes (4) and (6) at ca 565 and 554 cm −1 respectively, is in accordance with a trans-octahedral configuration of the two alkyl groups [14]. Instead, in the diphenyltin(IV) dichloride complex (5), the asym and sym Sn C stretching vibrations are observed at ca 287 and 232 cm −1 respectively, which are lower than those found in trans-R 2 octahedral diphenyltin(IV) complexes containing N-donor ligands [15].…”

Tin(IV) and organotin(IV) derivatives of bis(pyrazolyl)acetate: Synthesis, spectroscopic characterization and behaviour in solution.

“…The difference Dm = m asym (COO) À m sym (COO) is always higher than 200 cm À1 , in accordance with a unidentate COO moiety [24]. In the far-IR region medium to strong absorptions appear upon coordination, arising from the stretching modes of Sn-O [24], Sn-R [25][26][27][28][29] and Sn-halide components [24]. In the IR spectra of 1-16, single absorptions assigned to Sn-O have been detected between 350 and 430 cm À1 .…”