钛硅沸石中的一种非活性钛物种

Synthesis of the titanium silicalite TS-1 was first reported by Taramasso et al[1]in 1983. TS-1 has received considerable interest during the last decade because of its unique catalytic properties in oxidation reactions involving H2O2 as the oxidant. It is accepted that the extraframework Ti species in TS-1 favor the decomposition of H2O2and should be avoided. But in the present study, it was observed that there was a kind of Ti species inactive in both the oxidation reaction and the decomposition of H2O2.     

Synthesis and Structural Characterization of new Tri (2-methyl-2- phenylpropyl) tin Carboxylates containing Germanium

Organotincompoundsareextensivelystudiedfortheirbiologicalactivity'.Organogermaniumisanotherkindofelementthathasawiderangeofbiologicalactivity=.Tolinkbiologicalactivepropertiesoforganotinandorganogermaniumcompounds.wehavepreviouslyreportedthebiologicalactivityoftrialkyltingermylpropionates'andanticanceractivityofdibutyltindigermylpropionates'.ItiswellknownthatTorque(his[tri(2-methyl-2-phenylpropyl)tin]oxide)iswidelyusedinagricultureasanacaricide.Inthispaper,asthecontinuationofourpreviouswork"'…     

Conformational analysis of dicarbonyl(methylcyclopentadienyl)(2-(diethylamino)-2-oxoethyl)iron(II): a spectroscopic and molecular mechanics study

A combination of NMR and IR spectroscopic techniques was used to examine the conformational preferences of the previously unreported oxaallyliron compound dicarbonyl(methylcyclopentadienyl)(2-(diethylamino)-2-oxoethyl)iron(II) (1). IR studies revealed that 1 existed in n-pentane solutions as an equilibrium between two or more exchanging conformers through a rotation about the Fe---C bond. An additional contribution to the conformational dynamics of 1 was identified due to the resonance component of the amide group. The resonance contribution manifested in the observed restricted rotation about the C---N amide bond. Molecular mechanics calculations were used to model the conformational processes. The calculations predicted that the resonance stabilized conformation was the energetically preferred structure of 1. This agrees with the experimental evidence that identified the influence of resonance on the conformation of 1.     

Characterization of electronic properties of the Cr(CO)3 group in chromium, tricarbonyl [3-[(η-aryl)methylene]-Z-1(3H)-isobenzofuranones] using spectral and theoretical methods

The IR, ¹³C- and ¹⁷O-NMR spectral characteristics of the Cr(CO)₃ group in a series of eight chromium, tricarbonyl[3-[(η⁶-aryl)methylene]-Z-1(3H)-isobenzofuranones] were correlated mutually as well as with theoretical data obtained by optimized MMX force-field and EHT calculations. The net charges on the carbon and oxygen atoms of the CO group and their differences were found as the most appropriate quantitative characteristics for the electronic properties of the Cr(CO)₃ group. Using the results of the previously reported linear correlations, the electron-withdrawing effect of the PhCr(CO)₃ moiety, weakened by the back-donation effect, was estimated as σ0.45 on the scale of Hammett substituent constants.     

十二烷基磺酸铜(Ⅱ)配合物的电子顺磁共振谱及红外光谱和电子结构

本文制备了十二烷基磺酸铜配合物,用电子顺磁共振谱（ＥＳＲ）,红外光谱（ＩＲ）和量子化学计算研究了它们的电子结构。     

In situ scanning FTIR microscopy and IR imaging of Pt electrode surface towards CO adsorption

In situ scanning FTIR microscopy was built up for the first time in the present work, which consists of an FTIR apparatus, an IR microscope, an X-Y mapping stage, and the specially designed electrochemical IR cell and computer software. It has been demonstrated that this new space-resolvd in situ IR technique can be used to study vibration properties of micro-area, and to perform IR imaging of electrode surface. The chemical image obtained using this technique fur CO adsorption on Pt electrode illustrated, at a space-resolution of 10~(-2) cm, the inhomogeneity and the distribution of reactivity of micro-area of electrode surface.     

Effect of the solvent nature and the number of electrophilic substituents in the molecule on hydration of nitro derivatives of phenanthrene-9,10-quinone

Solvates (1⩺2) of 10,10-dihydroxy-2,4,7-trinitro-9,10-dihydrophenanthren-9-one with DMSO and of 10,10-dihydroxy-2,7-dinitro-9,10-dihydrophenanthren-9-one with HMPA were prepared. The crystal structure of 2,5-dinitrophenanthrene-9,10-quinone was established. The results of X-ray diffraction analysis and IR spectroscopy of a series of mono-, di-, and trinitro derivatives of phenanthrene-9,10-quinone demonstrated that the ability of carbonyl groups to participate in nucleophilic addition of water increases as the number of nitro groups in substituted phenanthrene-9,10-quinone increases. The nature of the solvent (HMPA, DMF, or DMSO) affects hydration of phenanthrenequinones primarily due to the difference in the strength of intermolecular hydrogen bonds stabilizing di- and tetrahydroxy-dihydrophenanetherenes. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 738–742, April. 1999.     

Condensation reactions of vinyl and ethyl derivatives of 2-amino-and 2-formylimidazoles

New Schiff bases of 1-vinyl- and 1-ethyl-substituted imidazoles and benzimidazoles were synthesized. The condensation reactions of 2-amino- and 2-formylimidazoles with 2-aminobenzimidazoles are virtually independent of the nature of the substituent (CH=CH₂ or Et) at position 1 of the heterocycle. The structures of the azomethines synthesized were established by¹H NMR and IR spectroscopy. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 5, pp. 971–974, May, 1999.     

Study of complexation between difluorostannylene and aromatics by matrix IR spectroscopy

Complexes (1:1) between difluorostannylene and benzene, chlorobenzene, and toluene as well as the (PhH)₂·SnF₂ complex were obtained and characterized by matrix IR spectroscopy. The capability of carbene analogs to form labile complexes with aromatics was demonstrated for the first time taking SnF₂ as an example. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 97–102, January, 1999.     

Vibrational spectra of volatile inorganic hydrides in the liquid state

The results of studies of IR and Raman spectra of volatile inorganic hydrides of Group IV–VI and Periods 3 and 4 elements in the liquid state are surveyed and analyzed. The mechanisms of intermolecular interactions in these liquids are discussed. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 629–644, April, 1999.