Dy3+在Ba3La(BO3)3 中的光致发光

研究了Ba3La(BO3)3 基质中Dy3 的光致发光特性; 探讨了RE3 的电荷半径比(z/r)和Ce3 , Dy3 含量对Dy3 发光强度及发光颜色的影响; 分析了Ba3La(BO3)3 中Ce3 对Dy3 发光的敏化作用; 确定了Dy3 的 4F9/2→6H15/2及4F9/2→6H13/2跃迁发射的浓度猝灭机制均为电偶极-电四极相互作用.     

钙钛矿CH3NH3PbI3晶体的电化学

电化学方波伏安及循环伏安测量表明,钙钛矿CH₃NH₃PbI₃晶体在有机电解质中的氧化还原过程伴随着化学降解。该化学降解源于CH₃NH₃PbI₃晶体中铅离子的还原以及碘离子的氧化。通过电化学伏安法可以测定晶体的能带。     

Non-Isothermal Kinetics of the Decomposition Reaction of Cluster [Ag3WS3Br]（PPh3）3 and [Cu3WS3Br]（PPh3）3

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.     

有关NdCl_3·3ROH-AlEt_3催化体系的活性

<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:     

KMgF3:Ce3+,Tb3+纳米粒子中Ce3+→Tb3+的发光及能量传递

利用微乳液方法,合成了铈、铽共掺杂的氟镁钾纳米粒子,研究了体系中Ce3+→Tb3+的发光特性以及它们之间的相互作用,结果表明KMgF3:Ce3+Tb3+纳米粒子中存在Ce3+→Tb3+的能量传递过程,即Ce3+可以将吸收的能量直接传递给Tb3+离子,使得Tb3+的绿色发光强度大为增加.     

LaVO3和NdVO3的合成

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。     

Growth and Spectral Properties of Yb^3＋-doped Ba3Gd（BO3）3 Crystal

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.     

钙钛矿CH_3NH_3PbI_3晶体的电化学（英文）

电化学方波伏安及循环伏安测量表明,钙钛矿CH_3NH_3PbI_3晶体在有机电解质中的氧化还原过程伴随着化学降解。该化学降解源于CH_3NH_3PbI_3晶体中铅离子的还原以及碘离子的氧化。通过电化学伏安法可以测定晶体的能带。     

209Bi NQR in Mixed Oxides 2Bi2O3· B2O3, 3Bi2O3· 5B2O3, and Bi2O3· 3B2O3

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.     

SYNTHESIS AND STRUCTURE OF[Et_4N]_3[FE_3(SPh)_3Br_3Cl_3]

<正> The title compound was synthesized and its structure solved. The formula is [Et4N]3[Fe3(SPh)3Br3Cl3]. M=1231.95, monoclinic, space group C2/c, a=24.569(4), b=13.504(2), c=18.348.(3)A, β=110.78(1)°, V=5691(3)A3, Z=4, Dm= 1.41, Dc=1.44-g/cm3. The flat structure of the anion has. a planar [Fe3S3] ring and three phenyl groups. Statistical distribution of chlorine and bromine atoms on two sides of the [Fe3S3] plane results in a C2 symmetry of the anion.     

簇合物[WOS3Ag3Br(PPh3)3]·(OPPh3)的合成和晶体结构

报道了〖ＷＯＳ３Ａｇ３Ｂｒ（ＰＰｈ３）３〗．（ＯＰＰｈ３）簇合物（Ｃ７２Ｈ６０Ａｇ３ＢｒＯ２Ｓ３Ｐ４Ｗ,Ｍｒ＝１７６４．６１）单晶的合成和结构。该晶体三方晶系,空间各为＄３,晶胞参数,ａ＝１６．１４３（３）,ｃ＝２３．００３（４）Ａ,Ｖ＝５１８９．４（１５）Ａ＾３,μ（ＭｏＫａ）＝３．２９８ｍｍ＾－１,Ｚ＝３,Ｆ（０００（）＝２５９８,Ｄｃ＝１．６９４ｇ／ｃｍ＾３。独立衍射点２１８１,可观察衍射点     

Synthesis and Crystal Structure of Tetraamminelithium-Rubidiumtriselenide, Li(NH3)4RbSe3, and Pentaamminesodium-Rubidiumtriselenide-Ammonia(1/3), Na(NH3)5RbSe3 · 3NH3

Summary. The ammoniates Li(NH₃)₄RbSe₃ and Na(NH₃)₅RbSe₃·3NH₃ were prepared by the reduction of Rb₂Se₅ with lithium or sodium in liquid ammonia. Single crystals were isolated and characterized by X-ray structure analysis using low temperature techniques. Both compounds contain triselenide anions Se₃^2–, which coordinate to rubidium cations forming ¹[RbSe₃]^– or ¹[Rb(NH₃)₂Se₃]^– chains. The chains are separated in the crystal structures by the homoleptic ammine complexes Li(NH₃)₄⁺ and Na(NH₃)₅⁺.     

DIRECT CONVERSION OF 3-ACETOXYBENZOFURANS TO 3-METHOXYBENZOFURANS

ＤＩＲＥＣＴＣＯＮＶＥＲＳＩＯＮＯＦ３－ＡＣＥＴＯＸＹＢＥＮＺＯＦＵＲＡＮＳＴＯ３－ＭＥＴＨＯＸＹＢＥＮＺＯＦＵＲＡＮＳ￥ＺｈｉＭｉｎＷＡＮＧ；ＸｉａｏＴｉａｎＬＩＡＮＧａｎｄＳｈｕＦｅｎｇＣＨＥＮ（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｅｒｉａＭｅｄｉｃａ，...     

簇合物〔WOS_3 Ag_3 Br(PPh_3)_3〕·(OPPh_3)的合成和晶体结构

报道了〔WOS3Ag3Br(PPh3) 3〕·(OPPh3)簇合物 (C72 H6 0 Ag3BrO2 S3P4W ,Mr=176 4.6 1)单晶的合成和结构。该晶体属于三方晶系 ,空间群为R3 ,晶胞参数 :a =16 .14 0 (3) ,c =2 3 .0 0 3(4) ,V =5 189.4(15 ) 3,μ(MoKα) =3 .2 98mm- 1 ,Z =3 ,F(0 0 0 ) =2 5 98,Dc=1.6 94g/cm3。独立衍射点 2 181,可观察衍射点 195 2 (I≥ 2σ(I) ) ,R =0 .0 496 ,wR =0 .12 48。该晶体由簇合物分子〔WOS3Ag3Br(PPh3) 3〕和以P为中心的扭曲四面体结构的中性分子OPPh3 构成 ,其中的簇合物分子的骨架为由1个W原子、3个S原子、3个Ag原子和 1个Br原子构成的立方烷状。W、O(1)和Br原子位于C3轴上。