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平行线是初中平面几何最基本、也是非常重要的图形,它的用处很多.解题时,若能根据题目的特点,恰当地添加平行线,就可巧妙转移线段......
在有些几何问题中,常通过在原图形上添加辅助线,把其补成一个新的特殊的几何图形,如等边三角形、正方形、矩形、圆等.利用这些特......
证明两条线段相等的方法有很多,本文介绍三种常用的方法,以供参考. 例题已知:在△ABC中,AB=AC,在AB上取一点D,AC的延长线上取一点......
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十一姐姐:心灵的房间,不打扫就会落满灰尘,蒙尘的心会变得灰暗和迷茫。只有扫地除尘,才能使黯然的心变得亮堂;把事情理清楚,才能告......
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INTRODUCTION. Four compounds of diterpenoids that have in vitro cytotoxity against cultured Hala cells have been obtain......
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(一)黑龙江省宁安县新安人民公社是一九五八年九月十三日,由三十一个高级农业生产合作社组成的,全社现有三十四个管理区,四千三百......
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A new compound, bis(tetraunethylcyclopentadienyl)ruthenium has been synthesized by reduction reaction of tetramethylcyc......
Mr=448.5, monoclinic P21/c, a=8.531(3), B=12.076(4), C=33.309(13) A, β=95.41(1)°, V=3416.2(2) A3, Z=4, μ(MoKα)= 1.2......
STRUCTURE STUDIES ON NEW TYPES OF MACROCYCLE COMPOUNDS.PART Ⅲ CRYSTAL STRUCTURE OF NICKEL(Ⅱ) COMPLEX
INTRODUCTION. In the privious paper we have reported the crystal structure of the ligand, (7S, 14R) 5,5,7,12,12,14 hexa......
Mr= 721.98,monoclinic, P21/n,a= 9.773(1), b = 6.641(3), c = 16.258(1)A,β=92.25(1)°,V=1054.4(7)A3,Dx = 2.274g/cm3,Z=2,......
STRUCTURE OF 1-CHLOHOMETHYI-3,4,6,7,10,11-TRIBENZO-2,8,9-TRIOXA-5-AZA- 1-SILATRICYCLO-(3.3.3. O1,5)-
Mr=367.88, Monoclinic, C2/c, a=17.758(7), b=ll.838(3), c= 16.793(7)A, β=103.79(3)°,V=3428(2)A3, Z=8,μ(MoKα)=3.10cm-......
CRYSTAL AND MOLECULAR STRUCTURE OF 1.3-DI-ISO-PROPYL-2-PHENYL-4-METHOXY-4,5-DIOXO-2-THIO-1,3,2,4-DIA
The structure of the title compound has been determined by X-ray analysis. The crystals of this coiapound are monoclini......
To elucidate structural relations between benzo-13-crown-4 and its similar crown compound. We determined the crystal st......
The title compound, C15H30N2PdCl2 (Mr=427.73), crystallizes in two kinds of crystal forms I and II.I : monoclinic, P21/......
INTRODUCTION. Studies of six-coordinated diorganotin(Ⅳ) compounds with octahedral geometry have been widely made, whic......
INTRODUCTION. The hole size of crown ether directly affects its complexing ability. Substitution of nitrogen atom for o......
The crystal and Molecular structure of [K(18-crown-6)](Bi(SCN)Cl3] has been deterained by X-ray diffraction Method. Its......
INTRODUCTION. Rare earth complexes with carboxylic acids have been investigated extensively, but little attention has b......
THE CRYSTAL STRUCTURE OF l-DIPHENYLMETHYL-4-[4-(4-FLUOROPHENYL)-3-TRANS-BUTENYL]PIPERAZINE,C_(27)H_(
The title compound is one of the scries of Ca-antagonist. We study its structure and properties to develope the efficie......
Ni[(C6H11O)2PS2]2, Mr=627.39, Monoclinic, P21/n, a=11.802(7), b= 9.336(2), c=14.177(5) A,B=96.72(4)°,V=1551.3A3, Z=2, ......
M=342.44, monoclinic, P21, a=8.100(2), b=20.493(2), c=10.830(2) A, β=90.78(2)°,V=1797.5 A3, Dc=1.265 g.cm-3, Z=4. The......
The structure of the title compound, a pentacyclic triterpenoid isolated from Clinopodium Polycephalum (Vant.) C. Y. Wu......
期刊
SYNTHESIS AND CRYSTAL STRUCTURE OF SODIUM ETHYLENEDIAME-TETRAACETATOVANADYL(IV) TETRAHYDRATE Na[VO(C
Mr=451,orthorhombic,P212121, a=6.524(2), b=13.910(2),c= 19.694(5)A,V=1787.4A3,Z=4,Dx=1.670 g·cm-3,MoKd,λ=0.71073A,μ=......
1993年,中国人民聚精会神抓机遇,意气风发创辉煌,以如虹的热情和务实的开拓,夺取了国民经济的持续、快速、健康发展,创造出了为世......
