Synthesis and characterization of organotin Schiff base chelates

Syntheses, crystal structures, and quadratic nonlinear optical properties in four “push–pull” diorganotin derivatives

“…The distances and angles around the tin atom are shown in Table 2. The distances are comparable with those previously reported in similar complexes [14]. However, in dibutyl derivative 1b, the compound is a dimer with Sn-O intermolecular interactions.…”

Synthesis and spectroscopic characterization of new adducts of diorganotin(IV) dichlorides with an asymmetric schiff base ligand

“…Further comparison with the spectrum of free ligand reveals the presence of a strong band in the spectra of the complexes at 1540 cm À1 due to the m(C'O) providing evidence of participation of the phenolic oxygen in the metal-ligand bonding [16]. The strong band at 570 cm À1 in the spectra of complexes can be assigned to the Sn-O bond [21]. Presence of both m s (Sn-C) and m as (Sn-C) in the IR spectrum of dimethyltin(IV) complex (520 and 540 cm À1 , respectively) is consistent with a nonlinear C-Sn-C configuration.…”

Biologically active organotin(IV) schiff base complexes

“…The 1 H NMR spectra signal at 5 ppm observed in the schiff base (1) is assigned to alcoholic protons which is absent in the spectra of complexes (1a) (1b) (1c) indicating the complexation of the ligand moiety to tin [26]. The 13 C NMR signals due to the carbon atoms attached to the thionic and the azomethine groups in ligands appear at 163 ppm and 210 ppm which remain at the same position in the spectra of the complexes (1a) (1b) (1c) indicating that these bonds were not involved in the bonding respectively [27]. Protons of the phenyl group were absorbed in the usual region and some additional signals were observed in benzyl derivative (1c) [28].…”