Heptacoordination in Organotin(IV) Complexes: Spectroscopic and Structural Studies of 2,6–Diacetylpyridine bis(thiosemicarbazone)di–n–butyltin(IV) Chloride Nitromethane Solvate, [nBu2Sn(H2daptsc)]Cl 2•MeNO2 and of 2,6–Diacetylpyridine bis(semicarbazone)dimethyltin(IV) trans–Tetrachlorodimethylstannate(IV), [Me2Sn(H2dapsc)][Me2 SnCl4]

Abstract

Heptacoordination in Organotin(IV) Complexes. Spectroscopic and Structural Studies of 2,6-Diacetylpyridine bis(thiosemicarbazone)di-n-butyltin(IV) Chloride Nitromethane Solvate, [ n Bu 2 Sn(H 2 daptsc)]Cl 2 •MeNO 2 and of 2,6-Diacetylpyridine bis(semicarbazone)dimethyltin(IV) trans-Tetrachlorodimethylstannate(IV), [Me 2 Sn(H 2 dapsc)][Me 2 SnCl 4 ]

Synthesis, 119Sn Mössbauer spectroscopic studies and X-ray crystal structure determination of new seven-coordinate diorganotin(IV) complexes with S,N,N,N,S-pentadentate Schiff bases derived from 2,6-diacetylpyridine of S-methyl- and S-benzyldithiocarbazates

“…spectra of the complexes exhibit m(C=N) bands shifted to both higher and lower wave numbers, providing evidence for ligand deprotonation and coordination through thiolate sulfur atoms. Significant changes in the ligand bands upon complexation include shifting and splitting of the ring frequencies, m(C=N) + m(C=C), as is usually observed for other similar organotin(IV) complexes [10]. The spectra of the ligands have bands at 1099, 1066 cm )1 and 1069, 1027 cm )1 that we suggest are due to m(N-N) for H 2 dapmdtc and for H 2 dapbdtc, respectively.…”

“…Due to the structural requirements of the bis(S-alkyl/aryl-dithicarbazates) moieties, the pentagonal geometry is not regular around the Sn(IV) atom. The angle subtended by the two sulfur atoms, 95.25 (10) Sn(dapbdtc)], also contribute to the observed distortion. The equatorial coordination bond distances Sn-S(1), Sn-N(1) py and Sn-N(2) (see Table 2) are longer than the equivalent bond distances Sn-S(1) = 2.5528 (8) [21] and [ n Bu 2 (2,6Achexim)] [22].…”

“…However, pentadentate agents derived from S-alkyldithiocarbazates have not received much attention and the first organotin(IV) complex of this class of ligands was recently reported by Ali and collaborators [9]. This paper is an extension of research programs devoted to the investigation of the coordination modes of bis(semicarbazones) and bis(thiosemicarbazones) with organotin(IV) compounds as well as to the chemistry and structures of five-, six-and seven-coordinate organotin(IV) derivatives [10][11][12]. The ligands shown below were chosen since they have the potential to form seven-coordinated tin(IV) compounds.…”

Heptacoordinate Tin(IV) Compounds Derived from Pyridine Schiff Bases: Synthesis, Characterization, in Vitro Cytotoxicity, Anti-inflammatory and Antioxidant Activity

“…21,22) The Schiff base-organotin complexes have received special attention in view of their chemistry and structural aspects of hypervalent species. [23][24][25][26][27][28][29][30] Regarding this, investigations concerning chelating properties and coordinative effects of 2,6-diacetylpyridine and its influence on the conformation and geometry of heptacoordinated tin complexes derived of hydrazones, 31,32) semicarbazones, thiosemicarbazones, [33][34][35][36][37][38][39][40] acylhydrazones, 41) have been undertaken. Our interest in organotin(IV) and organosilicon compounds containing pyridine moieties let us to study the influence and nature of the ligand substituents in the formation of pentacoordinate tin and silicon derivatives.…”

Synthesis, complexation, spectral and antimicrobial study of some novel 5-bromo-2-fluorobenzaldehydeoxime and semicarbazone under ultrasonic irradiation

“…Metal complexes with ligands containing nitrogen and oxygen donor atoms have act as the fungicidal agents. Synthesis of oximes and semicarbazone and their complexes with different transition metals are reported in the literature [1][2][3][4][5][6][7]and found to be active as antibacterial , ant tubercular [8][9] ,antilepral [10], antiviral [11], antimalarial [12] tumours [13][14] pesticide [15] herbicide [16]anticonvulsant activity [17]and hypnotic [19] properties or the ability of some of their Cu(II) complexes to mimic superoxide dismutase activity [20]Semicarbazonecomplexesof some metal ions have been reported [21][22][23][24] .In this paper, a novel series of transition metal complexes with oxime and semicarbazone were synthesized and they were screened for antimicrobial activities. Most of the complexes were shown moderate to good antibacterial and antifungal activity.…”