Synthesis, Spectroscopic Properties and Structural Characterization of Tri（o-chlorobenzyl）tin Ester of 4-Pyridinecarboxylic Acid

The tri(2-chlorobenzyl)tin(IV) complex with 4-pyridinylcarboxylate ligand tri(o-chlorobenzyl)tin ester of 4-pyridinecarboxylic acid has been synthesized by the reaction of tri(2-chlorobenzyl)tin(Ⅳ) chloride with 4-pyridinyl carboxylic acid and characterized by elemental analysis, IR and ^1HNMR, and its crystal structure was determined by X-ray single-crystal diffraction.     

Hypersensitive Spectrophotometric Determination of Trace Amounts of Tin ( Ⅳ ) with Salicylfluorone and Mixed Surfactants

Introduction Since it was found that cetyltrimethylammonium bromide (CTMAB) can increase greatly the sensitivity of the tin (Ⅳ)-pyrocatechol violet (PV) system, the micellar speetrophotometric determination of tin (IV) has been developed extensⅣely. The most widely used acidity dyes are PV and Bromopyrogallol Red (BPR). They have     

Tetra(acetylacetonato) tin(Ⅳ) as new catalyst for polytrimethylene terephthalate synthesis

<正>Chelate tetra(acetylacetonato) tin(Ⅳ) was prepared and used as catalyst for polytrimethylene terephthalate synthesis.It exhibited higher catalytic activity than tetrabutyl titanate,butyltinhydroxide oxide and dibutyltin oxide.Decrease in reaction time, content of terminal carboxyl group,color intensity and increase in intrinsic viscosity were observed.The unique molecular structure can be considered as factor remarkably improving the catalytic activity of tetra(acetylacetonato) tin(Ⅳ).     

Synthesis of di-μ-OXO-tetra-（α-pentyloxy） tin（Ⅳ） phthalocyanine

Axially substituted tin phthalocyanines, namely dichloride-tetra-（α-pentyloxy） tin （Ⅳ） phthalocyanine 2, dihydroxy-tetra-（α-pentyloxy） tin （Ⅳ） phthalocyanine 3 and its dimmer di-μ-oxo-tetra-（α-pentyloxy） tin（Ⅳ） phthalocyanine 4 were synthesized. The catalytic effect of H2O-free CaCl2 in quinoline was used for condensation of dihydroxy tin phthalocyanine 3 to the cofacially array dimmer 4. Their structures were characterized by UV-vis, IR, elemental analysis, MS, as well as ^1HNMR spectroscopy.     

Synthesis and Gas-sensing Performance of Nanosized SnO2

Nanosized tin dioxide particles were prepared by sol-gel dialytic processes with tin(Ⅳ) chloride and alcohol as start materials. The nanoparticles of tin dioxide were charactered by thermogravimetry and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET. The results show that the average diameter of tin dioxide particles dried at 353 K was about 2nm. Even if the tin dioxide particles were calcined at 873 K, the average diameter of particles was less than 10 nm. The removal of Cl^- was solved by using this kind of method. The mechanism of the formation of tin dioxide nanosized particles was proposed and analyzed in this paper. We also measured the sensitivity of the sensor based on the tin oxide powder calcined at 673K to NH3, alcohol, acetone, hexane and CO. The gas-sensing performance results indicate that this sensor has a higher sensitivity to alcohol and acetone, and selectivity for NH3, hexane and CO at an operating temperature of 343 K.     

邻香草醛缩氨基酸钾Schiff碱及其三苄基锡(Ⅳ)配合物的合成与表征

Six schiff bases derived from o-vanillin and amino acids and their trihenzyltin (Ⅳ) complexes have been synthesezed.The ligands and complexes were characterized by elemental analysis, IR, UV and ¹H NMR.The tin atom is five-coordinated in tribenzyltin (Ⅳ) complexes.There is intramolecular Sn←N of imine Natom.     

从不同氧化态锡盐水热合成法制备纳米SnO2粉体

Nanocrystalline SnO₂ were prepared by a novel gel hydrothermal route from alcoholic solutions of tin(Ⅱ) and tin(Ⅳ) salts. X-ray diffraction analysis and transmission electron microscopy showed that the resulting oxides were both in the form of powders having crystallites of about 5 nm in diameter. The formation procedures of the two precursors and the gas-sensing properties of the two SnO₂ nanocrystals were compared.     

Synthesis and Crystal Structure of (CH_2)_3(3,5-Me_2Pz)_2. [PhBr_2Sn(CH_2)SnBr_2Ph].2HBr.H_2O (Pz=pyrazole)

1 INTRODUCTION The coordination chemistry of tin or organotin toward poly(pyrazol-1-yl)borate ligands has been extensively investigated in recent years owing to the antitumor activity of some related organotin derivatives containing N-donor ligands. A number of organotin(Ⅳ) complexes containing poly(pyrazol- 1-yl)borate ligands have been synthesized and characterized[1~3], some of which have also shown interesting structural characteristics and reactivities[4~6]. Recently, poly(pyrazol…     

Pt-Sn/MgAl2O4催化剂的TPR和H2-TPD研究

Pt Sn/MgAl 2O 4 catalysts prepared by co impregnation with nominal 0 35% platinum and varying content of tin (0～2 5%) were characterized by temperature programmed reduction (TPR) and temperature programmed desorption of hydrogen (H 2 TPD). TPR results showed that platinum catalyzed the reduction of tin. However, the average oxidation state of tin after reduction depended upon the concentration of tin on the catalysts. H 2 TPD data indicated that tin addition inhibited the inactivated adsorption of hydrogen but promoted the activated adsorption, implying that tin modified both the ensembles of platinum and metal support interface, thus increasing hydrogen mobility and promoting hydrogen spillover.     

Studies on Tricyclohexyltin ( Ⅳ ) Diaryldithiophosphates

Fourteen new tricyclohexyltin (Ⅳ)-O,O-diaryldithiophosphates were synthesized and determined by IR, 1H NMR, 13C NMR, 119Sn NMR MS, and elemental analysis. The structures of all the compounds consist of discrete molecule containing a four-coordinated tin atom. Results from the preliminary biological test show that these compounds have a high miticidal activity.     

Tin(II) Chloride Dihydrate Catalyzed Groebke Condensation: An Efficient Protocol for the Synthesis of 3-Aminoimidazo[1,2-a]pyridines

The ability of tin(II) chloride dihydrate as a catalyst to promote the three-component condensation reaction from a diversity of aromatic aldehydes, 2-aminopyridines and isonitriles at room temperature is described. This methodology affords a number of 3-aminoimidazo[1,2-a]pyridines in the presence of tin(II) chloride dihydrate as a new and mild Lewis acid catalyst in the multi-component reaction in reasonable yields and short reaction time without any significant optimization of the reaction conditions.     

The First Discovery of a Tin Deposit Related to Hercynian A-Type Granites in China

This paper introduces the petrological, mineralogical and geochemical fea. tures of the rocks hosting the Sareshik tin deposit—an independent tin deposit related to Hercynian A-type granites discovered in China in 1987. A comparison with the features of A-type granites at home and abroad indicates that some of their petrological features are more typical than those of famous A-type granites of Nigeria. The geological features of the tin deposit are salient and notably different from those of some famous tin deposits in China, so the deposit may represent China's deposits associated with anorogenic granites. This tin deposit was formed in the Hercynian Stage. This type of tin deposit was for the first time discovered in China and is also rare in the world. It is a new type of tin deposit in China.     

Synthesis,Structural Investigations and Biological Screening of Diorganotin（Ⅳ） Complexes Derived from 5,5-Diethyl Sodium Barbital

Some biologically important tin（Ⅳ） complexes derived from 5,5-diethyl sodium barbital have been synthesized and characterized through various analytical and spectroscopic techniques such as IR, ^1H-, ^13C-NMR and ^119mSn mossbauer. On the basis of these spectroscopic techniques, octahedral geometry has been assigned to all the novel compounds. These complexes, soluble in DMSO and DMF, were screened against a wide range of microorganisms. The results proved that the diphenyltin（Ⅳ） and dibutyltin（Ⅳ） complexes exhibit excellent activity against all types of microorganisms, while the rest of the compounds show significant activity that can be used during the biological study.     

Synthesis, Spectroscopic Properties and Crystal Structures of Dibenzyltin（IV） Dithiobenzoate and Chlorodibenzyltin（IV） Thiobenzoate

Two dibenzyltin(IV) complexes with thiobenzoate ligand, (PhCH2)2Sn(SOCPh)2 (1) and (PhCH2)2Sn(C1)SOCPh (2), have been synthesized by the reaction of dibenzyltin(IV) dichloride with thiobenzoic acid in the presence of organic base Et3N and characterized by IR, ^1H NMR spectroscopy and elemental analysis. Their crystal structures were determined by X-ray single crystal diffraction analysis. In the crystals of 1, the tin atom is six-coordinated in a distorted octahedron configuration. In the crystals of 2, the molecular packing in unit cell reveals that the two adjacent molecules are symmetrically linked to each other to form a dimer with intermolecular Sn…C1 distances of 0.3591 (2) nm and the tin atom is five-coordinated in a distorted trigonal bipyramid configuration.     

丙酮酸异烟酰腙四核有机锡配合物的合成、表征及{[nBu2Sn(C9H8N3O3)O]SnBu3n}2的晶体结构

The tetranuclear alkyltin(Ⅳ) compounds {[R2Sn(C9H8N3O3)O]SnR3}2 [R=n-Bu (1), 4-CNC6H4CH2 (2),C6H5CH2 (3), 4-ClC6H4CH2 (4)] were prepared by the reaction of Schiff base ligand pyruvic acid isonicotinyl hydrazone with (R3Sn)2O in the corresponding molar ratio of 1:1. All compounds have been characterized by elemental analysis, IR and ^1H NMR spectra. The crystal structure of compound 1 was determined by X-ray single crystal diffractional analysis. This compound exhibits a dimeric structure containing distannoxane units with two types of the tin atoms. For the first tin atom, it appears to be seven-coordinated with a distorted pentagonal bipyramid geometry, and the other is five-coordinated with a distorted trigonal bipyramidal geometry. The molecules are packed in the unit cell in two-dimensional network structure through an interaction between the N atoms of the pyridine and the tin atoms of an adjacent molecule.     

THE MOSSBAUER SPECTRA AND COORDINATION STRUCTURE OF TRICYCLOHEXYLTIN CARBOXYLATES

<正> The Mossbauer spectra and IR spectra of a series of new tricyclo-hexyltin carboxylates, (C5H11)3SnOCOR, showed that there was only four-coordinate tin in each compound and no intermolecular oxygen to tin coordination for the bulkiness of cyclohexyls and R groups.     

Regioselective synthesis of linalyl compounds via addition reaction of geranyl bromide and tin with carbonyl compounds

Linalyl alkyl or aryl carbinols were regioselectively synthesized by the reaction ofgeranyl bromide and powdered tin with aldehydes and ketones.     

Synthesis,Characterization and Crystal Structure of a Trinuclear Diorganotin(Ⅳ) Complex with N'-acetylsalicylhydrazide

A diorganotin(IV) complex [(CH3)2Sn]3L2(L=N'-acetylsalicyl-hydrazide) 1 has been successfully synthesized and structurally characterized by elemental analysis,FT-IR,NMR(1H,13C and 119Sn) spectra and X-ray crystallography.The crystal structure belongs to an orthorhombic system,space group Pnma with a=8.5047(16),b=28.466(5),c=12.842(2) ,V=3109.1(10)3,C24H32N4O6Sn3,Mr=828.61,Dc=1.770 g/cm3,μ(Mo-Kα)=2.432 mm-1,Z=4,F(000)=1608,the final R=0.0378 and wR=0.0973 for 2125 observed reflections(Ⅰ 2σ(Ⅰ)).The complex is a trinuclear organotin(Ⅳ) containing five-and six-coordinated tin atoms.And weak but significant Sn···O intermolecular interactions lead to the assembly of complex into a 1D linear polymeric chain supramolecular framework.     

Synthesis, Crystal Structure and Quantum Chemistry Study of Tri（o-bromobenzyl）tin Ferrocenecarboxylate

A novel complex tri(o-bromobenzyl)tin ferrocenecarboxylate has been synthesized and its crystal structure was determined by X-ray diffraction. It belongs to orthorhombic, space group Pbca with a = 1.1340(3), b = 1.7823 (4), c = 3.0119(8) nm, V = 6.088(3) nm3, Mr = 857.81, Z = 8, Dc = 1.872 g/cm3, μ(MoKα) = 52.63 cm-1, F(000) = 3328, R = 0.0683 and wR = 0.1057. The tin atom adopts a distorted tetrahedral coordination geometry. Further studies on the title com- plex have been performed with quantum chemistry calculation at the Lanl2dz basis set level using G98W package. The stability of the complex, some frontier molecular orbital energies and com- position characteristics of some frontier molecular orbitals have been investigated.     

Gold nanoparticles attached NH2+ ion implantation-modified indium tin oxide electrode: Characterization and electrochemical studies

An NH2+ ion implantation-modified indium tin oxide film was prepared and the implantation of amino groups on the indium tin oxide substrate was verified by X-ray photoelectron spectroscopy analysis.The gold nanoparticles attached surface could be obtained by self-assembly of different sized colloidal gold nanoparticles onto the NH2+ ion implantation-modified indium tin oxide surface.By scanning electron microscopy and electrochemical techniques,the as-prepared AuNPs attached NH2+ ion implantation-modified indium tin oxide electrode was characterized and compared with bare indium tin oxide electrode.Using a [Fe(CN)6]3 /[Fe(CN)6]4 redox probe,the increasingly facile heterogeneous electron transfer kinetics resulting from the attached gold nanoparticle arrays was observed.The gold nanoparticle arrays exhibited high catalytic activity toward the electro-oxidation of nitric oxide,which could provide electroanalytical application for nitric oxide sensing.