Supramolecular organization in catena-poly{diethyl[3-(2-pyridyl)-2-sulfanylpropenoato]tin(IV)} and related diorganotin(IV) sulfanylcarboxylato compounds

Triphenyltin(IV) sulfanylpropenoates: synthesis, crystal structures and antimicrobial activities

“…The pyspa ligand is quasi-planar [the SnOC 2 S ring (rms = 0.018) makes an angle of 5.95°with the pyridine ring] and the main distances and angles are similar to those found previously in [SnEt 2 (pyspa)] except that the pyridine ring is anti with respect to the metallated ring instead of syn. 22 The structural parameters of the thiol and carboxylato groups and hydrogen bonds are similar to those found in the pspa derivative. 18 The similarity of the planar SnSC 2 O rings of …”

“…These values are small in comparison with those found in other complexes in which a ligand coordinates via just one of the oxygen atoms of a carboxylato group; 24 this is attributed to the N-H-O hydrogen bond, which significantly lengthens the C-O bond of the non-coordinated oxygen. As regards the remaining bands, n(Sn-S) is close to the positions found for diorganotin derivatives of these ligands, 22 and n(Sn-C) (a ligand vibration probably contributes to the n sym band) is located at positions typical of a non-planar SnC 3 framework. 7…”

The Chelating Behaviour of 3‐(4‐X‐Phenyl)‐2‐sulfanylpropenoic Acids with the PbII Ion – Relevance of the Lone Electron Pair in the Supramolecular Structures of the 2:1 Complexes

“…As could be expected, in the 13 C NMR spectra of the ligands an important dependence of the position of the C(7) signal on the nature of the para-X atom was observed. In the complexes, the S coordination was confirmed by the large deshielding of C(2) with respect to the corresponding ligands, [13,14,34,39] and the large downfield shift of C(1) provided evidence for the coordination of the carboxylate group.…”

“…These values fall inside the general range [33] for bridging carboxylate groups. However, it should be noted that for this specific class of sulfanylpropenoate ligands, we have previously found values within this range for the bridging coordination mode [14,34] or bidentate and bridge [35] mode of the carboxylate group. Therefore, both coordination modes would be compatible with the experimental IR data for this class of compound.…”

“…The NMR signals (see Experimental Section) were assigned by considering previous data for rhodanines, [38] sulfanylpropenoic acids [34,35] and complexes, [13,14,34,39] and on the basis of gradient heteronuclear multiple quantum coherence (gHMQC) and gHMBC experiments when necessary. Freshly prepared solutions of [D 6 ]DMSO were used to record the spectra, but even under these conditions H 2 (Ipspa) evolved very rapidly to give new species (possibly the disulfide), which were not fully characterized.…”