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1.
胡春华  孙杰等 《中国化学》2002,20(6):536-538
Inrecentyearssynthesisandcharacterizationofnewmetallaboranesandmetallacarboraneshaveattractedmuchinterest .1 3Awidevarietyofclustercomplexes ,inwhichcoordinationcanbeviaB—H—Mor (and)Bn—Mbond(n =1,2 ,3,4 ,5 ,6 ) ,havebeensynthesizedandstructurallycharacterized .Thepo…  相似文献   

2.
用双-(2-羟乙基)二硫代甲酸铵(HEDC)在反相液相色谱中作检测某些金属离子的衍生化试剂,HEDC的金属螯合物微溶于水,可直接水样注射于C18柱中进行检测,范围为0.006~10mg/L相对偏差1%~2%,检测波长254nm,金属汞的整合物在HPLC分析前进行浓缩富集检测限可低至0.06~25μg/L,相对偏差小于2%。  相似文献   

3.
合成了[Cu(C_(11)H_(11)O_3)(C(10)H_8N_2)_2]NO_3·C_2H_5OH化合物并测定其晶体结构。晶体属P1空间群,a=1.1911(2)nm,b=1.5322(2)nm,c=1.0492(2)nm,a=108.98(1)°,β=107.04(1)°,γ=70.25(1)°,Z=2.在[Cu(C_(11)H_(11)O_3)(C_(10)H_8N_2)_2] ̄+配合阳离子中,2个2,2’-联吡啶的4个氮原子和二苯羟乙酸的1个羧基氧原子位于铜原子周围,从而使铜原子子具有畸变的三角双锥配位构型。对红外光谱进行了归属。  相似文献   

4.
合成了(CeO_2)_(0.7-x)(MO)_x(La_2O_3)_(0.3)(M=Mg、Ca、Sr)固体电解质。对其晶体结构、电导率、XPS谱、离子迁移数及制成的燃料电池的V-I曲线进行了测定。(CeO_2)_(0.7)(La_2O_3)_(0.3)中掺入Ca ̄(2+)、Mg ̄(2+)或Sr ̄(2+),可使电解质的氧离子导电性能改善,从而使制成的燃料电他的开路电压输出功率也得到提高。  相似文献   

5.
1INTRODUCTIONTherehasbeenincreasinginterestindesigningpolymetalliccomplexeswithmixeddiphosphineandthiolateligandsowingtotheuniqueopticalandoptoelectronicproperties[1].Itiswell-knownthatthiolatesasversatilebridgingligandscanexhibitvariousbondingmodestoprod…  相似文献   

6.
7.
(Pb_(0.88)Nd(0.10))(Ti_(0.92)In_(0.06)Mn_(0.2))O_3超细陶瓷粉末的制备与研究杨昆山,陈种菊,陈坚业,张惊涛(四川联合大学化学系,成都,610064)关键词超细粉,共沉淀,制备掺In2O3、Nd2O3和MnO?..  相似文献   

8.
CrystalStructureandMolecularAbsoluteConfigurationof(+)-Isocedranol(C_(15)H_(26)O)¥LiuJie;ChenMin-Qin(CenterofAnalysis&Measurem...  相似文献   

9.
中国科学(化学部)院士概况(续)三、121位院士分别来自全国44个单位,其中有二个以上院士的单位24个,院士的工作单位分布见表3。四、121位院士的当选时间和学科方向等简况见表4参考文献||[1]大学化学1992226[2]大学化学19941封三Br...  相似文献   

10.
研究了助熔剂对BaMgAl_(10)O_(17)基质中Eu~(2+)发光的影响,结果表明,F~-离子的存在使Eu~(2+)形成了新的发光中心,在两个发光中心之间产生有效的能量传递.新的发光中心的形成使Eu~(2+)的猝灭浓度提高.  相似文献   

11.
郎建平  蔡进华 《结构化学》1995,14(4):297-299
StructureofCopper(Ⅱ)Bis(piperidyldithiocarbamate)LangJian-ping;LuJian-Mei;BianGuo-Qing(DepartmentofChemistry,SuzhouUniversity...  相似文献   

12.
The title compound 3,3'-(2,2'-(ethane-1,2-diylbis(oxy))bis(ethane-2,1-diyl))bis(2- (4-chlorophenylamino)quinazolin-4(3H)-one) 3 (C34H30CI2N604, Mr = 657.54) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction analysis. It crystallizes in space group P1 with a = 9.9185(8), b = 10.6124(9), c = 15.4064(13) A, α = 92.896(2),β = 103.813(2), γ= 94.635(2)°, V= 1565.5(2) A3, Z = 2, Dc = 1.395 g/cm^3,μ = 0.257 mm^-1, F(000) = 684, the final R = 0.0580 and wR = 0.1284 for 3400 observed reflections (I〉 2σ(I). It remains triclinic in the crystal. Intra- and intermolecular N(3)-H(3A)…O(2), N(6)-H(6A)…O(3) and C(19)-H(19A)…O(4) #1 (#1: 1-x, 1-y, -z) hydrogen bonds are observed in the title compound. A two-dimensional chain network is formed from the dimmers and intermolecular π-π interactions in the crystal structure. This open network has solvent-accessible voids (10A3).  相似文献   

13.
The synthesis,the crystal structure and the reaction of the hetero-binuclear complex[MnRe(CO)6(μ-SH)(μ-SC(H)PPr^i3)(PPh3)] are reported.The results of single crystal X-ray structure analysis showed that the fragments Mn(CO)3 and Re(CO)3 were bridged by SH and SC(H)PPr^i3.The title complexes can react with Bu^nLi and RX forming complexes MnRe(CO)6(μ-SR)(μ-SC(H)PPr^i3)(PPh3)](R=Me,CH2CH=CH2,SnBu3^n).  相似文献   

14.
In this paper, density functional computations have been applied to the structural, elastic and electronic properties of ternary transition metal diborides Re0.5Ir0.5B2, Re0.5Tc0.5B2, Os0.5W0.5B2 and Os0.5Ru0.5B2 in hexagonal (P63/mmc) and orthorhombic (Pmmn) structures with both local density approximation and generalized gradient approximation. LDA gives smaller lattice parameters and larger elastic moduli than GGA. Both results show that the hexagonal ones are more stable than orthorhombic ones except Os0.5Ru0.5B2. Moreover, the hexagonal structure has superior elastic property than orthorhombic one. Generally speaking, the calculated elastic moduli of Re0.5Ir0.5B2 and Os0.5Ru0.5B2 are smaller than those values of Re0.5Tc0.5B2 and Os0.5W0.5B2 within the same structure because of the filling of antibonding states. The relativistic effects result in weaker bonds of Tc-B (Ru-B) than those of Re-B (Os-B). All the diborides are ultra-incompressible. Re0.5Tc0.5B2 has the largest shear modulus and it is a promising superhard diboride like Os0.5W0.5B2. The elastic properties are in high correlation with the bond strength. The shear moduli are more sensitive than the bulk moduli to the bond strength.  相似文献   

15.
合成了双膦醋酸钌配合物,不同温度的 ̄1HNMR谱表明,两个醋酸根分别以单齿和双齿配体与中心钌(Ⅱ)配位; ̄(31)PNMR和X-射线结构分析表明膦配体为面式构型。配合物对丙烯酸和苯乙烯有选择氢化活性。  相似文献   

16.
17.
在pH 9.80的硼砂-氢氧化钠缓冲溶液、十六烷基三甲基溴化铵(CTMAB)存在下,铜(Ⅱ)、镉(Ⅱ)、镍(Ⅱ)和锌(Ⅱ)与二甲酚橙(XO)发生灵敏的显色反应,所形成的络合物吸收光谱严重重叠,各组分间相互干扰。采用人工神经网络结合分光光度法,设计不经分离同时测定铜(Ⅱ)、镉(Ⅱ)、镍(Ⅱ)和锌(Ⅱ)含量的方法。结果表明...  相似文献   

18.
The crystal structure of [Cu (Im)4] (teph) (Im = imidazole, teph = terephthalate) has been determined by X‐ray crystallography. It crystallizes in the triclinic system, space group Pī with cell dimensions of a = 0.80356 (16) nm, b = 0.84269 (17) run, c = 0.88967 (18) nm, α = 76.90 (3)°, β = 68.95 (3)°, γ = 75.94 (3)°, and Z = 1. Its structure of the title compound is composed of discrete monomelic molecule of [Cu (Im)4]‐(teph). The copper (II) ions have a square plane geometry with the CuN4 chromophore.  相似文献   

19.
The title compound (Z)-1-(3-fluorobenzyl)-5-((3-fluorobenzylimino)(2-hydroxy-4- methoxyphenyl)methyl)pyridin-2(1H)-one (C27H22F2N2O3,Mr = 460.47) was synthesized and crystallized. The crystal belongs to the triclinic system,space group P1 with a = 9.951(6),b = 10.059(6),c = 12.927(7)A,α = 109.828(7),β = 102.304(7),γ = 104.898(7)°,Z = 2,V = 1110.2(11)A^3,Dc =1.377 Mg/m^3,μ(MoKα) = 0.102 mm^-1,F(000) = 480,the final R = 0.0449 and Rw = 0.1250 for 4595 observed reflections (I 〉 2σ(I)). X-ray analysis reveals that both m-fluorobenzyl groups are diorientationally disordered because of the rotation of C–C single bond which was represented as F(1),F(2) and F(1'),F(2'). The diorientational disorder was refined and gave the occupancies of 0.665(4) and 0.335(4) for F(1) and F(1'),0.631(3) and 0.369(3) for F(2) and F(2'). Hydrogen bonds existing in the cell link different components to stabilize the crystal structure. The active data proved that the title compound has good anti-HBV activity.  相似文献   

20.
The title compounds (S)-methyl-2-(4-R-phenylsulfonamido)-3-(1H-indol-3- yl)propanoate (R = H (1), Cl (2)) have been synthesized and their crystal structures also have been determined by X-ray single-crystal diffraction. Compound 1 (C18H18N2O4S) belongs to orthorhombic, space group P212121 with a = 9.6348(14), b = 11.1517(17), c = 16.412(3) A, V = 1763.4(5) A^3, Mr = 358.40, Z = 4, De = 1.350 g/cm^3,/t = 0.209 mm^-1, F(000) = 752, R = 0.0348 and wR = 0.0714. Compound 2 (CI8H17ClN2O4S) crystallizes in orthorhombic, space group P212121 with a = 9.3128(14), b = 10.9655(16), c = 17.783(3) A, V = 1815.9(5) A^3, Mr = 392.85, Z = 4, De = 1.437 g/cm^3, p = 0.352 mm^-1, F(000) = 816, R = 0.0389 and wR = 0.0845. The absolute structure Flack parameters X of compounds 1 and 2 are -0.03(8) and -0.06(7), respectively. X-ray analysis reveals that the crystal structures of these two compounds both involve two intermolecular N-H…O hydrogen bond's.  相似文献   

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