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1.
Yu. A. Ferapontov M. A. Ul’yanova T. V. Sazhneva N. P. Kozlova 《Russian Journal of Applied Chemistry》2008,81(1):26-29
The kinetics of decomposition of hydrogen peroxide in the liquid phase of the ternary system LiOH-H2O2-H2O was studied in the presence the solid phase of Li2O2·H2O and without it. The main kinetic parameters of the processes studied were determined. 相似文献
2.
A number of Sn (Ⅳ)complexes have been synthesized since 1980 and tested its anticancer activity1. The simplest complex Bu2SnCl2 has activity to P388 tumor cells. Several metal complexes such as Ru-ind (trans-indazolium (bisindazole) tetrachloro- ruthenate (Ⅲ)) had used transferrin as a drug delivery system, the complexes still exhibit high antitumor activity and lower toxicity2. We use EHPG as a model ligand3 to study the interaction between Bu2SnCl2 and EHPG. EHPGAt first, we stud… 相似文献
3.
Mohammad M. Mojtahedi M. Saeed Abaee Mashal Javadpour 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):2362-2365
Solvent-free protection of aromatic and aliphatic thiols with acetic anhydride was performed at room temperature under trace quantities of magnesium bromide ethyl etherate, affording rapid formation of various thiol esters in excellent yields. 相似文献
4.
The mechanisms of [2?+?2?+?2] reactions of three ethynes and monosilaethylenes to form benzene and 1,3,5-trisilacyclohexane were studied by ab initio MO methods. The reaction mechanisms were analyzed by configuration interaction/localized molecular orbital/CASSCF calculations. Although the [2?+?2?+?2] reaction of ethyne is typically ??homologous?? concerted, that of monosilaethylene is polarized (ionic-cyclic) one-step reaction. In addition, the aromaticity along the intrinsic reaction coordinate pathway was studied using the index of deviation from aromaticity. Although the transition state of trimerization of ethyne does not have an aromatic nature for the ??- and ??-bonds formation system, the crossing point of the ??-bond formation and ??-bond breaking shows an aromatic nature. 相似文献
5.
Introduction In the field of thermal analysis kinetics, there have been many kinetic models and methods of processing the corresponding data, which can depict the most probable kinetic mechanism of solid state reactions, such as the method combining differential and integral methods,1-6 the method combining isothermal and non-isothermal processes7,8 and method of TA curve shape,9,10 and so on. Recently, based on the predeces-sor抯 work, a more complete kinetic method of process-ing thermal ana… 相似文献
6.
《Journal of solid state chemistry》1986,63(3):401-408
Mössbauer studies on a mosaic of single crystals of the layered compound TlFe2−xSe2 have been carried out at various temperatures between 100 and 460 K. A magnetic transition occurs at ∼450 K. The magnetic ordering within the FeSe layers is antiferromagnetic with the spins oriented along the tetragonal axis. X-Ray diffraction data indicated ordering of the iron vacancies at the chosen composition (x ∼ 0.3) yielding a supercell with a volume five times that of the ThCr2Si2 type subcell, the cell parameters being a = 8.6909(5) Å and c = 14.005(1) Å. 相似文献
7.
Rui Ping QIAO Yong Min MA Xin Hua QI Nan LI Xiang Can JIN Qi Shan WANG Yuan Yi ZHUANG 《中国化学快报》2005,16(9):1271-1274
The experiments were performed to investigate the degradation of microcystins in order to assess the effectiveness and feasibility of UV/H2O2 system for the disinfection of water polluted by microcystins. The influence factors such as H2O2, pH and UV light intensities were investigated respectively. Degradation of microcystin-RR (MC-RR) could be fitted by either the pseudo-first-order or second-order rate equations. This homogenous system could significantly enhance the degradation rate due to the synergetic effect between UV and H2O2. The degradation mainly followed the mechanism of direct photolysis and .OH oxidation reactions. Experimental results showed that 94.83% of MC-RR was removed under optimal experimental conditions and the UV/H2O2 system provided an alternative to promote the removal of microcystins in drinking water supplies. 相似文献
8.
SinceHutton]developedanovelr0utet0preparationofthe2-alkoxycarbonylalkyltintrichIorides,R'OCOCHRCH,SnCI,(l),lhavereceivedconsiderableattenti0nbecauseofthevarietyofcoordinationgeometriesaboutthetinatom.2-'Previ0usly,wehadre-portedtheadducts0flwithneutraIdonorssuchasDMSO,HMPA,bpyandphen.'-'Inthispaper,wereportthesynthesis0fthecomplexes0flwithnegativebivaIentligandderivedfr0m2-salicylideneamin0phenop(H2L),R'OCOCHRCH,SnClL(R=H,Me,R'=Me,Et,n-Pr,Allyl,n-Bu),andthecrystaIstructureof… 相似文献
9.
Blockcopolymersasidealcompatibilizershavefoundwideapplicationsinpolymerblends.Forblockcopolymerscontainingpolarblocks,itsadditiontoablendcontainingpolarcomponentsleadstothedecreaseininterfacialtensionbetweentheimmisciblephasesoftheblend,theincreaseinc… 相似文献
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11.
《合成化学》2004,(Z1)
Gossypol was obtained as an yellow platelike crystal with m.p. 210-214o . In CDCl3 there were three tautomers of gossypol: I aldehyde, II lactol,III ketal , in equilibrium .Their total H 1 NMR spectra were assigned by means of 1D and 2D NMR techniques including 1H-1H cosy , DEPT , HMQC (1H Detected Heteronuclear Multiple Quantum Coherence) and HMBC (1H Detected Heteronuclear Multiple Bond Connectivity) experiments . This paper first reported that we took use of the 2D NMR t… 相似文献
12.
《结构化学》2017,(3)
Density functional theory was employed to study the dehydration mechanism of MgCI_2·4H_2O. Analysis of potential energy surface(PES) of possible pathways indicated that the most possible way was one of the water molecules halfly dissociated with an elongated bond distance with Mg~(2+),where electrostatic interaction played a leading role; another water molecule dissociated sequentially. It was in agreement with the result from differencial thermal analysis. The dehydration process of MgCI_2·4H_2O was clarified theoretically,promoting the theoretical study of dehydration of MgCI_2·2H_2O. 相似文献
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14.
《Journal of Coordination Chemistry》2012,65(12):1367-1372
Pd(creat)2Cl2·2H2O crystallizes in space group P&1macr; with a= 7.257(2), b= 8.159(2), c= 14.640(2) Å, f =73.97(2), g =77.0(1), u =72.22(2)°, Z=2, and represents a new allotropic form of this compound. Pd atoms have planar fourfold coordination of N and Cl atoms in trans configuration. Creatinine moieties are coordinated to the Pd atoms via endocyclic N atoms and their essential planarity causes significant delocalization of electron density. The structure is stabilized by a system of weak hydrogen bonds involving interstitial water molecules and creatinine amino-groups. 相似文献
15.
《Journal of solid state chemistry》1987,67(2):291-296
Ytterbium dichloride was prepared in pure form by the oxidation of elemental ytterbium by ZnCl2 with subsequent removal of the zinc impurities by sublimation. Ytterbium dibromide in the orthorhombic SrI2-type structural form was prepared in a sealed tantalum container by reduction of the tribromide with elemental ytterbium at a temperature not exceeding 960°C for 15 min. The dihalides, mixed intimately in appropriate molar ratios in a glove-box and contained in pyrolytic graphite boats, were melted under vacuum. These two halides form a solid solution with the SrI2-type structure. Lattice parameters are reported as a function of composition. 相似文献
16.
QuanZhenHUANG GongZhenCHENG HaiBoZHANG SongTaoDING XiaoBingYANG XiaoHaiZHOU GaoYongZHANG 《中国化学快报》2005,16(4):497-500
The Q-band position of tin-centered 5, 9, 14, 18, 23, 27, 32, 36-octabutoxy 2, 3-phthalocyanine(SnNc(OBu)8) exhibits dramatic red-shift as mixed with SnCl2 in CH2Cl2. 相似文献
17.
Reduction of NO2 with CO in the presence of NO and excess oxygen, a model mixture for flue gas, over a 0.1% Pt/SiO2 catalyst was studied. The related reaction mechanisms, such as oxidation of CO and NO, were discussed. It was found that there was a narrow temperature window (180-190 ℃) for the reduction of NO2 by CO. When the temperature was lower than the lower limit of the window, the reduction hardly occurred, while when the temperature was higher than the upper limit of the window, the direct oxidation of CO by O2 occurred and thereby NO2 could not be effectively reduced by CO. The presence of NO shifted the window to higher temperatures owing to the inhibition effect of NO on the activation of O2 on Pt, which made it possible to reduce NO2 by CO in flue gas. 相似文献
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A series of BR2 complexes of α-pyrrolyl dipyrrin were synthesized from BF2 complex of α-pyrrolyl dipyrrin (3-pyrrolyl BODIPY) by treating it with various alkyl- and aryl magnesium halides under mild Grignard reaction conditions. The BR2 complexes were functionalized at α-position of the appended pyrrole ring with formyl, chloro and bromo functional groups and these functionalized BR2 complexes were used further to prepare various novel derivatives of BR2 complexes. The BR2 complexes were characterized by HR mass, NMR, absorption, fluorescence, and electrochemical techniques. Two of the BR2 complexes were structurally characterized by X-ray crystallography. Our studies revealed that the substitution of fluorine atoms at the boron center of 3-pyrrolyl BODIPYs with different alkyl/aryl groups significantly alters their structural, spectral and electrochemical properties. The DFT studies also support the alteration of the electronic properties of the BR2 complexes. 相似文献