共查询到20条相似文献,搜索用时 640 毫秒
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《Journal of organometallic chemistry》1991,409(3):C15-C18
The interaction of [(η5-C5Me4R)Ru(CO)2]2 (1a: R = Me, 1b: R = Et) with yellor arsenic, As4, affords besides the pentaarsaruthenocenes [(η5-As5)Ru(η5-C5Me4R)] (2a, 2b) the tetranuclear clusters [{(η5-C5Me4R)Ru}3Ru(η3-As3)(μ3,η3-As3)(μ3-As)3] (3a, 3b). The structure of 2b and 3b has been elucidated by X-ray analysis. 相似文献
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The thermal behaviors of clusters [Ag3WS3Br](PPh3)3 and [Cu3WS3Br](PPh3)3 (PPh3=triphenyl phosphine) in a nitrogen atmosphere were studied under the non-isothermal conditions by simultaneous TG-DTG-DSC and EDS techniques. The results showed that the evolution of PPh3 generally proceeded before the release of the other moiety in one or two step-mode. The mechanisms, the kinetic and the thermodynamic parameters for decomposition of PPh3 of both clusters were determined and calculated by jointly using several methods, which showed that its evolution was controlled by Avrami-Erofeev equation. The results also showed that there was no new stable phase composed of W-Ag(Cu)-S-Br after release of organic moiety PPh3 and that CVD method was not applicable to their further processing. 相似文献
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有关NdCl_3·3ROH-AlEt_3催化体系的活性 总被引:1,自引:0,他引:1
<正> 我们曾指出,在NdCl_3·3ROH-AlEt_3体系中,醇的作用在于它的给电子性将会降低稀土离子的正电性,从而减弱Nd-Cl键的离子性,同时引起晶格的变化,使之有利于烷基化作用的发生,导致活性提高。本实验采用一种简便的方法证实了这种作用的发生。 这个方法所根据的原理是一般Ziegler-Natta型催化组分的熟知反应形式: 相似文献
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《Journal of Inorganic and Nuclear Chemistry》1981,43(6):1141-1145
Single crystal Raman spectra of the addition compounds RI3·3S8 (R = Sb, CH and As) have been reported for the first time. No single crystal X-ray work has been done for AsI3·3S8, but all three compounds exhibit similar spectra indicating that AsI3·3S8 also crystallizes in the same form. Vibrational modes of the constituent molecules have been observed and discussed in terms of factor group fundamentals. The assignments seem to substantiate previous work on sulphur. All the lattice modes as predicted by group theory have been observed. 相似文献
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LaVO3和NdVO3的合成 总被引:1,自引:0,他引:1
以V2O3为起始原料,在氩气中合成了ABO3型稀土钒化合物,对加热前通氩气的时间,V2O3∶La2O3的配比等进行了探讨,得到了适宜的制备条件。首次报道了LnVO3(Ln=La,Nd)的热学性质,发现LaVO3具有吸附二氧化碳的特性。 相似文献
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Crystal of Yb3+-doped Ba3Gd(BO3)3 has been grown by the Czochralski method. The spectroscopic characterizations have been investigated at room temperature. The Yb3+:Ba3Gd(BO3)3 crystal exhibits broad absorption at 976nm with FWHM of 7nm and large overall spitting of 2F7/2 manifold (823cm-1). The absorption and emission cross sections are 5.09×10-21cm2 at 976nm and 0.97×10-21cm2 at 1040nm,respectively. The fluorescence lifetime is 2.84 ms. 相似文献
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《Journal of organometallic chemistry》1989,369(3):C43-C46
One of the products of the reaction of the activated cluster Os3(CO)11(NCMe) with As(p-tol)3 in refluxing nonane has been shown by spectroscopic and X-ray crystallographic methods to be Os3(CO)9(μ3-AsC6H4CH3)(μ3-C6H3CH3), which contains a benzyne moiety bonded asymmetrically from one carbon to one osmium via a σ bond and from a second carbon to form a bridge between the remaining two osmium atoms. 相似文献
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Kravchenko E. A. Kargin Yu. F. Egorysheva A. V. Buslaev Yu. A. 《Russian Journal of Coordination Chemistry》2001,27(8):542-547
It was earlier found from nuclear quadrupole resonance (NQR) measurements and computer modeling that -Bi2O3, Bi3O4Br and mixed oxides Bi2O3· 2Al2O3, Bi2O3· 2Ga2O3, Bi2O3· 3GeO2, and 2Bi2O3· 3GeO2exhibit local ordered magnetic fields from 30 to 200 G. It thus follows that these compounds are not diamagnets in a conventional sence of the word. With the aim of revealing previously unknown magnetic properties in bismuth(III) oxide-based Main Group element compounds, the mixed bismuth–boron oxides 2Bi2O3· B2O3, 3Bi2O3· 5B2O3, and Bi2O3· 3B2O3were prepared and studied using 209Bi NQR. The quadrupole interactions of the 209Bi nuclei and their electronic environment were studied, the crystallochemical features of the compounds were discussed, and the conformity of the 209Bi results to the X-ray structure data was verified. The preliminary tests in the field of a permanent magnet showed that the resonance intensities increase in external magnetic fields, indicating that a magnetism of unknown nature develops in the titled compounds. It was found reasonable to continue studies of the magnetic properties of these compounds using single-crystal 209Bi NQR in external magnetic fields. 相似文献