2273-51-0Relevant articles and documents
Structural characterization of N-methylpyridoxine (MePN; PN = vitamin B6) and its diorganotin complexes [SnR2(MePN-H)]I (R = Me, Et, Bu and Ph)
Casas, Jose S.,Castineiras, Alfonso,Condori, Felix,Couce, Maria D.,Russo, Umberto,Sanchez, Agustin,Sordo, Jose,Varela, Jose M.
, p. 2790 - 2797 (2003)
For comparison with the corresponding pyridoxine complexes we have prepared dimethyl-, diethyl-, dibutyl- and diphenyltin(IV) complexes of N-methylpyridoxine (MePN). The compounds [SnMe2(MePN-H)]I (1), [SnEt2(MePN-H)]I (2), [SnBu2(MePN-H)]I (3) and [SnPh 2(MePN-H)]I·H2O (4) were isolated and characterized by IR, Raman, Moessbauer, 1 13C and 119Sn NMR spectroscopy, and by EI and FAB mass spectrometry. The crystal structures of [HMePN]I and of compounds 1, 2·2H2O and 3 were determined by X-ray diffractometry. Their lattices contain dimeric [SnR2-(MePN-H)]22+ units (R = Me, Et, Bu) in which two bridging-chelating methylpyridoxinato anions link pentacoordinate Sn atoms with coordination polyhedra closer to square pyramids than to trigonal bipyramids. NMR results show that the dimeric cations persist in (CD 3)2SO. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
UO2(VI), Sn(IV), Th(IV) and Li(I) complexes of 4-azomalononitrile antipyrine: Synthesis, characterization and thermal studies
El-Boraey,El-Saied,Aly
, p. 599 - 606 (2009)
UO2(VI), Sn(IV), Th(IV) and Li(I) complexes of 4-azomalononitrile antipyrine (L) have been isolated and characterized based on IR spectra, 1H NMR, elemental analyses, molar conductance and thermal analysis (DTA/TG). The study revealed that the ligand behaves as a neutral bidentate one and coordination takes place via the carbonyl atom of pyrazolone ring >C=O and the azomethine nitrogen >C=N. The thermal stability of the metal complexes were investigated by thermogravimetry (TG), differential thermal analysis (DTA) techniques and infrared spectra, and correlated to their structure. The thermal study revealed that Th(IV) complexes show lower thermal stability than both UO2(VI) and Sn(IV) complexes.
Study on the transesterification and mechanism of bisphenol A and dimethyl carbonate catalyzed by organotin oxide
Liang, Yanan,Su, Kunmei,Cao, Lei,Gao, Yuan,Li, Zhenhuan
, p. 2171 - 2182 (2019/06/21)
(CF3C6H4)2SnO, (CH3C6H4)2SnO and Ph2SnO were successfully synthesized for the transesterification of DMC with BPA. The products of mono-methylcarbonate-ended-BPA (MmC(1)) and two-methylcarbonate-ended-BPA (DmC(1)) were selectively synthesizedthem. The catalysts were characterized by FT-IR, TG and XPS. When Ph2SnO was used as the catalyst at 170?°C, the BPA conversion reached to 28.60% and the transesterification selectivity reached to 98.35%. As for (CF3C6H4)2SnO, BPA conversion and transesterification selectivity declined to 12.48% and 64.74%, respectively. The BPA conversion increased to 42.83%, but the transesterification selectivity declined to 44.55%(CF3C6H4)2SnO. Notability, the higher transesterification selectivity of Ph2SnO was due to its lowest electron binding energy of Sn4+. More importantly, the DMC adsorption, activation and decomposition process(CF3C6H4)2SnO, (CH3C6H4)2SnO and Ph2SnO were characterized by TG–MS and in situ DRIFT techniques, which provided more information about the mechanism of transesterification and methylation.
Structural investigations on diorgano- and triorganotin(IV) derivatives of [meso-tetra(4-sulfonatophenyl)porphine] metal chlorides
Pellerito,Scopelliti,Fiore,Nagy,Barone,Abbate,Stocco,Pellerito
, p. 1573 - 1583 (2007/10/03)
Several new complexes of organotin(IV) moieties with MCl n[meso-tetra(4-sulfonatophenyl)porphine], (R2Sn) 2MCln[meso-tetra(4-sulfonatophenyl)-porphinate]s and (R3Sn)4MCln [meso-tetra(4-sulfonatophenyl) porphinate]s, [M = Fe(III), Mn(III): n = 1, R = Me, n-Bu; Ph; M = Sn(IV): n = 2, R = Me, n-Bu] have been synthesized and their solid state configuration investigated by infrared (IR) and M?ssbauer spectroscopy, and by 1H and 13C NMR in D2O. The electron density on the metal ion coordinated inside the porphyrin ring is not influenced by the organotin(IV) moieties bonded to the oxygen atoms of the side chain sulfonatophenyl groups, as it has been inferred on the basis of M?ssbauer spectroscopy and, in particular, from the invariance of the isomer shift of the Fe(III) and Sn(IV) atoms coordinated into the porphyrin square plane of the newly synthesized complexes, with respect to the same atoms in the free ligand. As far as the coordination polyhedra around the peripheral tin atoms are concerned, infrared spectra and experimental M?ssbauer data would suggest octahedral and trigonal bipyramidal environments around tin, in polymeric configurations obtained, respectively, in the diorganotin derivatives through chelating or bridging sulfonate groups coordinating in the square plane, and in triorganotin(IV) complexes through bridging sulfonate oxygen atoms in axial positions. The structures of the (Me3Sn)4Sn(IV)Cl 2[meso-tetra(4-sulfonatophenyl)porphinate] and of the two model systems, Me3Sn(PS)(HPS) and Me2Sn(PS)2 [HPS = phenylsulfonic acid], have been studied by a two layer ONIOM method, using the hybrid DFT B3LYP functional for the higher layer, including the significant tin environment. This approach allowed us to support the structural hypotheses inferred by the IR and M?ssbauer spectroscopy analysis and to obtain detailed geometrical information of the tin environment in the compounds investigated. 1H and 13C NMR data suggested retention of the geometry around the tin(IV) atom in D2O solution.
Structure, properties and cytostatic activity of triorganotin (aminoaryl)carboxylates
Pruchnik, Florian P.,Banbula, Malgorzata,Ciunik, Zbigniew,Chojnacki, Henryk,Latocha, Malgorzata,Skop, Barbara,Wilczok, Tadeusz,Opolski, Adam,Wietrzyk, Joanna,Nasulewicz, Anna
, p. 3214 - 3221 (2007/10/03)
The properties of vinyltin and phenyltin complexes [Sn(CH=CH2)3{μ-OOCC6H3 (NH2)2-3,4}]n (1), [Sn(C6H5)3- {OOCC6H3(NH2)2-3,4}] (2), [Sn(C6H5)3{OOC-2-C6H4 N= NC6H4N(CH3)2-4})] (3) and [Sn(CH=CH2)3{OOC-2-C6H4N= NC6H4N(CH3)2-4}] (4) have been investigated. The structures of complexes 1, 2, and 3, have been determined by X-ray crystallography, Compound 1 is a distorted trigonal-bipyramidal complex and compounds 2 and 3 adopt a distorted tetrahedral structure. Complex 1 is a single-strand polymer with a bridging 3,4-diaminobenzoato ligand coordinating via the O(1) atom of the carboxylato group and the nitrogen atom of the para-amino group. The oxygen and nitrogen atoms occupy the axial coordination sites. The Sn(1)-N(2A) bond is weak. In complexes 2 and 3 the carboxylato hgands are strongly coordinated to the central atom via one oxygen atom, and the Sn(1)-O(2) distances are considerably longer. Weak interactions of the central atom with the amino group in complex 1, and with the O(2) atoms in complexes 2 and 3, as well as the hydrogen bonds, stabilize the crystal structure. The complexes are effective cytostatic agents. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.
