Synthetic, Structural, and Biochemical Studies of Organotin(IV) with Schiff Bases Having Nitrogen and Sulphur Donor Ligands

Abstract

Three bidentate Schiff bases having nitrogen and sulphur donor sequences were prepared by condensing -benzyldithiocarbazate () with heterocyclic aldehydes. The reaction of diphenyltin dichloride with Schiff bases leads to the formation of a new series of organotin(IV) complexes. An attempt has been made to prove their structures on the basis of elemental analyses, conductance measurements, molecular weights determinations, UV, infrared, and multinuclear magnetic resonance (, , and ) spectral studies. Organotin(IV) complexes were five- and six-coordinate. Schiff bases and their corresponding organotin complexes have also been screened for their antibacterial and antifungal activities and found to be quite active in this respect.

Synthesis, spectroscopic characterization, and 3D molecular modeling of lead(II) complexes of unsymmetrical tetradentate Schiff-base ligands

“…The IR spectra of the free ligands (Table 2) show characteristic bands at 3070-3300, 1703, 1657 (1650), 1354 and 1219 cm -1 assignable to intramolecular hydrogen bonded hydroxyl m(OH), carbonyl m(C=O), azomethine m(C=N), aryl azomethine m(C-N), and phenolic m(C-O) stretching modes [30,31], respectively, ( Table 2). The absence of a weak broad band in the 3070-3300 cm -1 region, noted in the spectra of the metal complexes, indicates deprotonation of the intramolecular hydrogen bonded OH group on complexation and subsequent coordination of phenolic oxygen to the metal ion.…”

Synthesis and characterization of Pb(II) complexes of Schiff bases derived from 3-methyl-4-fluoroacetophenone and amino acids

“…New peaks and quasi-peaks are also a guide to chelation. Moreover, comparison of the IR spectra of the ligands with those of their lead(II) complexes revealed [24] a major shift to lower wave numbers by 10-16 cm -1 in azomethine [24][25][26] m(C=N) at 1610-1618 cm -1 suggesting involvement of the azomethine nitrogen with the Pb(II) ion. The spectra of the ligands contain a broad absorption band in the region 3,100-2,560 cm -1 which is assigned to hydrogenbonded m(OH) [27].…”

Synthesis and Characterization of Schiff Base CoII, NiII and CuII Complexes Derived from 2-Hydroxy-1-naphthaldehyde and 2-Picolylamine

“…Biological activities of transition metal complexes derived from Schiff base ligands are one of the most exhaustively studied topic in coordination chemistry, due to their enhanced activities compared to non -Schiff base complexes [3][4][5][6][7]. Schiff base complexes show important physiological and pharmacological activities due to their favorable cell membrane permeability [8][9][10][11][12]. For example, amino acid Schiff base metal complexes have a wide variety of applications including biological, clinical [13] analytical and industrial area in addition to their important role in catalysis and organic synthesis [14,15].…”