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1.
A comprehensive review, >100 references, on organotin(IV) complexes of the carboxylic acid derivatives are presented with
special reference to their methods of synthesis, spectroscopic and structural studies and their biological activities. The
structures of these complexes are discussed on the basis of IR, multinuclear (1H-, 13C- and 119Sn-) NMR. 相似文献
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《Coordination chemistry reviews》2002,224(1-2):111-150
The organotin(IV) cations form complexes with ligands containing {O}, {N}, {S}, or {phosphorus(O)} donor atoms with various composition and stability. The emergence of new experimental techniques (EXAFS, multinuclear 1H-, 13C-, 119Sn-NMR, 119Sn Mössbauer, etc., spectroscopic techniques) provided useful information about the structure and stabilities of the complexes formed. We reviewed the literature on these type of complexes taking into account the biological aspects of the complexes discussed. 相似文献
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Shoukry MM 《Talanta》1996,43(2):177-183
The interaction of dimethyltin(IV) and diethyltin(IV) cations with water and some amino acids and related compounds was investigated at 25 degrees C and ionic strength 0.1 M NaNO(3) using a potentiometric technique. The results showed the formation of 11 and 12 (organotin:ligand) complexes and the corresponding stability constants were determined. The participation of different ligand functional groups in binding to organotin is discussed. The effect of the pK(a) value of the respective ligand on the stability constant of its complex species was elucidated. The concentration distribution of the complexes in solution was evaluated. 相似文献
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Di- and tri-organotin(IV) complexes of general formula R2SnAH, (R3Sn)2AH, R2SnB, (R3Sn)2B (A=dianion of mercaptosuccinic acid; B=dianion of thiodiacetic acid; R=Me, Et, nPr, nBu, nOct in R2Sn and nBu in R3Sn) have been synthesized and characterized by elemental analysis, IR and 1H and 13C NMR spectroscopy. These data support the preferential binding of sulphur over carboxylate by tin(IV) in R2SnAH and (R3Sn)2AH. R2SnAH complexes are assigned pentacoordinated bridged polymeric trigonal bipyramidal geometry whereas (R3Sn)2AH complexes are monomeric with trigonal bipyramidal geometry at tin arising from a bidentate carboxylate group at one tin atom and from weak bonding via Sn←O?C at the other tin atom. In R2SnB and (R3Sn)2B, tin(IV) binds to two carboxylate groups in a unidentate and a bidentate manner respectively, resulting in tetracoordinated and pentacoordinated structures. Potential uses of these compounds are discussed. 相似文献
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Byung-Seon Choi Geun-Il Park Jung-Won Lee Ho-Yeon Yang Seung-Kon Ryu 《Journal of Radioanalytical and Nuclear Chemistry》2003,256(1):19-26
The complexes of six organic carboxylic acids (containing {O,O} donor atoms) with Bu2Sn(IV)2+ and Ph3Sn(IV)+ with ligand to metal ratios of 1 : 1 and 1 : 2, were prepared by two different methods. The FtIR and Raman spectra clearly demonstrated that the organotin(IV) moieties react with the {O,O} atoms of the ligands. It was found that in most cases the -COO-group was chelated to the central metal ions, but monodentate coordination was also sometimes observed. Complex formation was accompanied by a rearrangement of the hydrogen-bonding network existing in the ligands. The complexes probably have polymeric structures. Comparison of the experimental Mössbauer D values with those calculated on the basis of the point charge model formalism revealed that the organotin(IV) moiety has a trigonal-bipyramidal (tbp) geometry, and in certain cases a tetrahedral (tetr) geometry too. Finally, the local structure of the maleic acid complex formed with Bu2Sn(IV)2+ was determined by an EXAFS method. 相似文献
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Summary Several new compounds of the type [R3Sn]3[Cr(NCS)6] and [R3Sn][Cr(NCS)4L2], where R = Ph or n-Bu and L = NH3, PhNH2 or CO(NH2)2, have been synthesized and characterized by analytical data, i.r. and electronic spectral studies. Conductance measurements indicate that the compounds are ionic. 相似文献
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A. Szorcsik L. Nagy L. Pellerito R. D. Lampeka 《Journal of Radioanalytical and Nuclear Chemistry》2003,257(2):285-291
The complexes of four oxime analogues of amino acids and peptides (containing {O,N} donor atoms) with Bu2SnO were prepared, with ligand to metal ratios of 1 : 1 or 1 : 2, by two different methods. The FT-IR and Raman spectra clearly demonstrated that the organotin(IV) moieties react with the {O,N} atoms of the ligands. It was found that in most cases the -COO- group is coordinated to the central metal ion in a monodentate mode. Complex formation was accompanied by a rearrangement of the hydrogen-bonding network existing in the ligands. The complexes probably have monomeric structures. Comparison of the experimental Mössbauer values with those calculated on the basis of the point charge model (pqs) formalism revealed that the organotin(IV) moiety has octahedral (oct) geometry, and in certain cases trigonal-bipyramidal (tbp) geometry too. 相似文献
13.
Mala Nath Pramendra K. Saini Xueqing Song 《Journal of organometallic chemistry》2008,693(13):2271-2278
The tetradendate macrocyclic ligands, [H2L-1 = 5,12-dioxa-7,14-dimethyl-1,4,8,11-tetraazacyclotetradeca-1,8-diene] and [H2L-2 = 6,14-dioxa-8,16-dimethyl-1,5,9,13-tetraazacyclohexadeca-1,9-diene] have been prepared by the condensation reaction of 1,2-diaminoethane and 1,3-diaminopropane, respectively, with ethyl acetoacetate in methanol at room temperature. The diorganotin(IV) complexes of general formula [R2Sn(L-1)/R2Sn(L-2)] (R = Me, n-Bu and Ph) have been synthesized by template condensation reaction of 1,2-diaminoethane or 1,3-diaminopropane and ethyl acetoacetate with R2SnCl2 (R = Me or Ph) or n-Bu2SnO in 2:2:1 molar ratio at ambient temperature (35 ± 2 °C) in methanol. The solid-state characterization of resulting complexes have been carried out by elemental analysis, IR, recently developed DART-mass, solid-state 13C NMR, 119mSn Mössbauer spectroscopic studies. These studies suggest that in all of the studied complexes, the macrocyclic ligands act as tetradentate coordinating through four nitrogen atoms giving a skew-trapezoidal bipyramidal environment around tin center. Since, the studied diorganotin(IV) macrocyclic complexes are insoluble in common organic solvents, hence good crystals could not be grown for single crystal X-ray crystallographic studies. Thermal studies of all of the studied complexes have also been carried out in the temperature range 0-1000 °C using TG, DTG and DTA techniques. The end product of pyrolysis is SnO2 confirmed by XRD analysis. 相似文献
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《Polyhedron》1988,7(18):1767-1771
The complexes [MOCl2(dmpe)(PMe3)] and [MOCl2(dmpe)2]Cl (M = Mo, W; dmpe = Me2PCH2CH2PMe2) have been prepared by reaction of the oxo compounds [MOCl2(PMe3)3] with equivalent amounts of the dmpe ligand under appropriate conditions. The dark blue tungsten species [WOCl2(dmpe)(PMe3)] forms only slowly but reacts readily with more dmpe to afford [WOCl(dmpe)2]Cl. This prevents isolation of the former in a pure form. The related isocyanide derivatives [MOCl2(CNR)(PMe3)2], (M = Mo; R = CMe3 and C6H11; M = W, R = CMe3) have been obtained similarly by reaction of the [MOCl2(PMe3)3] complexes with the stoichiometric amount of the isocyanide ligand, but attempts to prepare the carbonyl analogues, [MOCl2(CO)(PMe3)2], have proved unsuccessful. The new compounds have been characterized by analytical and spectroscopic methods (IR, 1H, 13C and 13P NMR spectroscopy). 相似文献
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Investigation on coordination modes of organotin(IV) complexes with 6-thiopurine and related ligands
The organotin(IV) complexes R2Sn(tpu)2 · L [L = 2MeOH, R = Me (1); L = 0: R = n-Bu (2), Ph (3), PhCH2 (4)], R3Sn(Hthpu) [R = Me (5), n-Bu (6), Ph (7), PhCH2 (8)] and (R2SnCl)2 (dtpu) · L [L = H2O, R = Me (9); L = 0: R = n-Bu (10), Ph (11), PhCH2 (12)] have been synthesized, where tpu, Hthpu and dtpu are the anions of 6-thiopurine (Htpu), 2-thio-6-hydroxypurine (H2thpu) and 2,6-dithiopurine (H2dtpu), respectively. All the complexes 1-12 have been characterized by elemental, IR, 1H, 13C and 119Sn NMR spectra analyses. And complexes 1, 2, 7 and 9 have also been determined by X-ray crystallography, complexes 1 and 2 are both six-coordinated with R2Sn coordinated to the thiol/thione S and heterocyclic N atoms but the coordination modes differed. As for complex 7 and 9, the geometries of Sn atoms are distorted trigonal bipyramidal. Moreover, the packing of complexes 1, 2, 7 and 9 are stabilized by the hydrogen bonding and weak interactions. 相似文献
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Organotin complexes of Schiff bases (derived from the condensation of hydrazides with salicylaldehyde derivatives) were prepared and their characterization was done using several spectroscopic techniques like FTIR, NMR (1H, 13C, and 119Sn) and mass spectrometry. The spectroscopic data of the ligands and their corresponding complexes revealed that the Schiff bases chelated to the tin metal in a tridentate manner through –ONO atoms (oxygen atom of the hydroxyl group of the salicylaldehydic derivatives, the nitrogen atom of azomethine group, and the oxygen atom of enolic group present in the carboxylic acid hydrazides). Around tin atom pentacoordinated geometry was exhibited. The synthesized ligands and their complexes have been assessed for their biological potency (antibacterial, antifungal and antioxidant using Ciprofloxacin, Fluconazole and Ascorbic acid as reference compounds) and few of the compounds showed optimistic activity. The ligands having electron withdrawing group attached showed greater antimicrobial activity as compared to the other ligands. The complexes showed the better activity than the ligands. The general trend followed by the complexes was diphenyl ?> ?dibutyl ?> ?dimethyl substituted complexes. Compound 11 was the most active against microbes. The antioxidant activity increased with electron donating group. The phenyl substituted complexes showed better activity as compared to the dibutyl and dimethyl substituted complexes. Compound 20 was the best antioxidant. 相似文献
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Mishra AK Manav N Kaushik NK 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2005,61(13-14):3097-3101
Some new organotin(IV) complexes with salicylaldehyde aniline-N-thiohydrazone (L1) and cinamaldehyde aniline-N-thiohydrazone (L2) of the type (p-ClC6H4)3Sn[L] Cl and (p-ClC6H4)2Sn[L]Cl2 have been synthesized (where L = L1 and L2). The complexes and ligands were characterized by elemental analysis and spectral (UV-vis, IR and 1H NMR) studies. In all the complexes, ligands act as bidentate, coordination through sulphur and azomethane nitrogen. Complexes are 1:1 metal ligands complexes. Antifungal studies of some complexes against Rhizoctonia bataticola fungal strain have been carried out. 相似文献
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Eva Fernández Aránzazu López de la Calle María J. González Garmendia 《Transition Metal Chemistry》1987,12(6):536-538
Summary Biacetyldihydrazone (BdH) and 2,2-6, 2-terpyridine (terpy) complexes of oxovanadium(IV) have been prepared and characterized by chemical analysis, conductance measurements, electronic, i.r. and e.p.r. spectral studies and magnetic susceptibilities measurements. Polymeric and monomer structures are proposed for the BdH and terpy complexes, respectively. 相似文献
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M. S. Pathania H. N. Sheikh B. L. Kalsotra 《Russian Journal of Inorganic Chemistry》2006,51(9):1445-1450
The synthesis and characterization of complexes, (Ph3P)2NH2[WO(CN)3L-L] · 3H2O and Cs[WO(CN)3L-L] · H2O (where L-L = morpholinomethylurea, morpholinomethylthiourea, piperidinomethylurea, piperidinomethylthiourea, pyrrolidinomethylurea,
and pyrrolidinomethythiourea) are presented. The complexes have been prepared by the reaction of K3Na[WO2(CN)4] · 6H2O with morpholinomethylurea and related ligands in aqueous solution around a pH of 7. These have been isolated as bis(triphenylphospine)imminium
or cesium salts. The complexes have been characterized by elemental analysis, ℝ, UV-Vis spectra, magnetic susceptibility and
conductivity measurements in addition to TGA/DTA
The text was submitted by the authors in English. 相似文献
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