微孔氟化磷酸镓Ga3P3O12F·0.5(1,8-C8H22N2)的水热自组装与晶体结构

采用水热合成法制备了一个三维微孔氟化磷酸镓Ga3P3O12F·0.5(1,8-C8H22N2)(简称Hit-6).反应起始原料摩尔配比为∶GaOOH∶H3PO4∶HF∶1,8-辛二胺∶H2O=1∶2∶1∶1∶555.Hit-6的骨架是由Ga3P3六聚体结构单元通过共顶点联接构成三维纳米孔结构,在[101]方向呈现8-元环孔道.     

Ga_8(H_2O)_6(HPO_3)_(14)·(C_3N_2H_6)_3·H_3O:含有经典6* 1 SBU的新型三维开放骨架亚磷酸镓

为了丰富亚磷酸盐结构,为多孔材料的定向合成提供一定的实验数据,在溶剂热的条件下,以咪唑为结构导向剂合成了一个具有三维开放骨架结构的新型亚磷酸镓化合物Ga8(H2O)6(HPO3)14·(C3N2H6)3·H3O(化合物1),并通过粉末X-射线衍射、红外光谱、热重、ICP和CHN元素分析对化合物进行了表征。单晶X-射线衍射分析结果表明,化合物1属于三斜晶系,P-3c1空间群,晶胞参数为a=b=1.33388(8)nm,c=1.7886(2)nm,γ=120(4)°,Z=2。其结构是由Ga O6八面体和[HPO32-]假四面体单元相互连接构成。该结构沿着[100]和[010]方向具有12元环孔道。值得注意的是,在化合物1的结构中存在两种不同的次级结构单元(SBU):经典的6*1单元Ga3P4和齿轮状的Ga P6单元。     

三维孔道结构钒磷酸盐[H3N(CH2)3NH3]2[H3N(CH2)3NH2][H2N(CH2)3NH2]-[V(H2O)2(VO)8(OH)4(PO4)4(HPO4)4]·4H2O的水热合成和结构表征

以1,3-丙二胺为模板,水热合成了三维孔道结构钒磷酸盐[H3N(CH2)3NH3]2[H3N(CH2)3NH2][H2N(CH2)3NH2][V(H2O)2(VO)8(OH)4(PO4)4(HPO4)4]·4H2O(DAP-V9P8).用单晶X射线衍射、红外光谱和热重法对该化合物的晶体结构进行了表征.DAP-V9P8的无机骨架由[VO5]、[VO6]、[PO4]和[HPO4]通过共顶点连接而成.孔道中充填的丙二胺分子随所处结晶学位置不同,有三种完全不同的分子构象.其中,位于//b轴直径达1.82nm椭圆形孔道中心的丙二胺分子碳链呈独特的直线状分布.晶体学参数:a=1.4820(9)nm,b=1.0255(4)nm,c=1.8181(9)nm,β=90.391(8)°;P21/n(No.14);R1=0.0772,wR2=0.2004(I＞(2σI)).与等结构的其它化合物进行了系统的结构比较.     

N-[[5-[[(1,4-二氢-2-甲基-4-氧-6-喹唑啉基)甲基]甲氨基]-2-噻吩基]羰基]-L-谷氨酸的一水合甲醇溶剂合物的合成、晶体结构及Hirshfeld表面分析

合成制备了N-[[5-[[(1,4-二氢-2-甲基-4-氧-6-喹唑啉基)甲基]甲氨基]-2-噻吩基]羰基]-L-谷氨酸的一水合甲醇溶剂合物(C21H22N4O6S·CH3OH·H2O(化合物1)的晶体,通过单晶X射线衍射,红外,热重分析表征.分析其含有一个结晶水和一分子甲醇溶剂,晶胞参数为a=7.9730(16)nm,b=13.558(3)nm,c=11.412(2)nm,α=90°,β=91.12(3)°,γ=90°.采用Hirshfeld表面分析方法对分子间作用力分析.Hirshfeld表明作用分析得到的二维指纹图显示,其中O…H,N…H,C…H,S…H的作用力要强与C…O,C…N作用力,其中H…H作用力明显.     

具有三维超分子结构的亚磷酸-草酸镓的溶剂热合成及结构表征（英文）

采用溶剂热法,合成了一个具有新颖三维超分子结构的亚磷酸-草酸镓化合物Ga(HPO3)(C2O4)(C3N2H4)·(C3N2H5)(化合物1),并通过粉末X-射线衍射,红外光谱、热重、ICP和CHN元素分析对化合物进行了表征。结果表明:该化合物属于正交晶系,Pnma空间群,晶胞参数为a=1.3288(3)nm,b=0.63614(13)nm,c=1.5364(3)nm,β=90°,Z=4。在化合物1中存在一个由[HPO3]单元和GaO5N八面体通过共顶点的氧原子组成的四元环梯形链。值得注意的是草酸根离子和咪唑离子镶嵌在一维链的两侧,相邻的两个链上的咪唑分子和草酸单元之间存在着强烈的氢键作用。正是由于这种氢键作用使化合物1的结构由一维链状变为三维超分子结构。此外,有机的咪唑分子在该化合物的合成中同时发挥了配体和模板剂的作用。     

吡啶甲酸铋(Ⅲ)配合物的合成与表征

以不同类型的吡啶甲酸为配体,通过固液相、固固相反应,合成了两种新的铋配合物:α-吡啶甲酸铋[Bi(C5H4NCOO)3]·H2O(1)、β-吡啶甲酸铋BiCl3·(C5H4NCOOH)·1.5H20(2).用元素分析、X射线粉末衍射、红外光谱和热分析等手段对配合物进行了表征.配合物1为单斜晶系,相应晶胞参数:a=2.0999nm,b=0.9499nm,c=1.1815nm,β=104.999°;配合物2为单斜晶系,晶胞参数:a=1.8589nm,b=1.6889nm,c=1.2049nm,β=960445°.同时初步分析了影响产物结构及性质的因素.     

模板硼酸盐[C4H12N][B5O6（OH）4]的合成及热处理对荧光性质的影响

以离子液体氯化三甲基羟乙基铵为原料合成了一种有机模板硼酸盐[C4H12N][B5O6(OH)4],通过单晶衍射仪对其的晶体结构进行了检测。此外,对其进行了PXRD,红外,热重以及固态荧光等表征。X射线单晶结构分析结果表明,该晶体属于单斜晶系,空间群为P21/C,晶胞参数为a=9.2546(19),b=16.855(3),c=9.2894(19),β=96.13(3)°,V=1440.73(467)3。[B5O6(OH)4]-通过氢键形成三维的骨架结构并形成孔道,用来平衡骨架电荷的[C4H12N]+嵌在这些孔道中。荧光光谱分析结果表明,在波长为290 nm的激发光下,该硼酸盐发射出326 nm、365 nm的紫外光。对样品进行不同温度的热处理后,样品的荧光性质发生了明显的变化。这种变温的改性实验证实该有机模板硼酸盐有可能作为一种单一发射组分荧光材料应用在显示和照明等白光LED领域。     

新型配位聚合物[Ni(C6H4NO2)2(H2O)4]n的水热合成和晶体结构

以NiCl2·6H2O和4-氰基吡啶为原料,在中温水热反应条件下,合成了一种新型配位聚合物[Ni(C6H4NO2)2(H2O)4]n单晶体,并对其进行了元素分析、红外光谱表征和X射线单晶衍射测定.该配位聚合物属三斜晶系,P-1空间群,a=0.6298(4)nm,b=0.6907(4)nm,c=0.9243(5)nm,α=96.437(8)°,β=105.184(9)°,γ=113.314(9)°,V=0.3456(3)nm3,Z=2,dc=1.802 g/cm3,μ=1.452mm-1,F(000)=194,R1=0.0309,R2=0.0753.该晶体通过配位键的连接和分子间氢键相互作用形成三维的网状结构.     

一维无机-有机杂化材料[Ni(2,2'-bipy)2]V2O6的水热合成与晶体结构

本文采用水热合成法制备了一维无机-有机杂化材料[Ni(2,2'-bipy)2]V2O6(1).反应起始原料摩尔配比为:Ni(Ac)2·H2O:NaVO3:H3BO3:B2O3:2,2-联吡啶:H2O=0.5:1:2.3:2:1.5:556.l属单斜晶系,P21/c空间群,晶胞参数:a=1.4482(3)nm,b=1.3747(3)nm,c=1.0456(2)nm,β=100.25(3)°,V=2.0484(7)nm3,Z=4.1是由VO4四面体通过共顶点联接构成一维链状结构.相邻链的2,2'-bipy分子的π-π相互作用对1分子的结构稳定起到重要的作用.     

基于不同簇单元构筑的三维超分子化合物(4,4'-bipy)_8H_9[PW_(12)O_(40)]_2[PW_(12)O_(40)]·11H_2O的水热合成与晶体结构

通过水热合成技术合成了一个由经典的Keggin和pseudo-Keggin双阴离子,以4,4'-bipy为有机模板剂共同构筑成结构新颖的三维超分子化合物(4,4'-bipy)8H9[PW12O40]2[PW12O40]·11H2O,对其进行了IR、XPS等表征,单晶X射线衍射分析结果表明,该化合物属于单斜晶系,P1—空间群,晶胞参数:a=1.1843(13)nm,b=1.9218(2)nm,c=2.1036(2)nm,α=63.3420(10)°,β=74.148(2)°,γ=79.721(2)°。由Keggin簇阴离子[PW12O40]3-构筑的一维超分子双链穿插于Pseudo-Keggin簇阴离子[PW12O40]3-二维超分子层的规则的菱形孔道中,形成新奇的三维超分子结构。     

Triethyl ammonium salt of O,O′-bis(p-tolyl)dithiophosphate, [Et3NH]+[(4-MeC6H4O)2PS2]−

Triethyl ammonium Salt of O,O′-bis(p-tolyl)dithiophosphate and O,O′-bis(m-tolyl)dithiophosphate have been obtained by reaction of p- and m-cresol, respectively with P₂S₅ in toluene and have been characterized by elemental analysis, IR, ¹H and ³¹P NMR spectroscopy. The molecular structure of O,O′-bis(p-tolyl)dithiophosphate has been determined. Crystal data: [Et₃NH]⁺[(4-MeC₆H₄O)₂PS₂]⁻: Monoclinic, P2₁/c, a=15.2441(9) ?, b=10.415(2) ?, c=3.9726(9) ?, β=91.709(7)°, V=2217.5(1) ?⁻³, Z=4.Supplementary materials Additional material available from the Cambridge Crystallographic Data Centre (CCDC no. 600927 for [Et₃NH]⁺[(4-MeC₆H₄O)₂PS₂]⁻ comprises the final atomic coordinates for all atoms, thermal parameters, and a complete listing of bond distances and angles. Copies of this information may be obtained free of charge on application to The Director, 12 Union Road, Cambridge CB2 2EZ, UK (fax: +44-1223-336033; email: deposit@ccdc.cam.ac.uk or www:http://www.ccdc.cam.ac.uk).     

First-principles coexistence simulations of supercooled liquid silicon

We perform first-principles coexistence simulations of the low-density and the high-density phases of supercooled liquid silicon and find a negative slope for the coexisting line in the temperature-pressure plane. Electron density maps and electron-localization function plots of the two phases of silicon show marked differences. The calculated differences suggest more localized electrons in the low-density liquid compared to the high-density liquid, coming from an increased population of covalent bonds, which further explain the calculated negative slope in the two phase coexistence regime. This is consistent with the presence of a pseudo-gap in low-density liquid silicon, absent in the high-density liquid which shows a metallic behavior.     

Crystal structures of thecis andtrans isomers of dithiahexahydro[3.3]metacyclophane

Structures of both thecis andtrans isomers of dithiahexahydro[3.3]metacyclophane, ?C₆H₄?CH₂SCH₂?C₆H₁₀?CH₂SCH₂?, have been determined, wherecis andtrans refer to the attachments to the cyclohexane ring. Thecis form crystallizes in the monoclinic space groupP2₁/c witha=8.4299(11)Å,b=21.772(2)Å,c=8.9724(13)Å, β=116.574(11)^o, andZ=4. Thetrans isomer packs into the monoclinic space groupP2₁ witha=8.159(16)Å,b=10.185(5)Å,c=9.558(2)Å, β=112.435(18)^o, andZ=2. The cyclohexane ring of thecis isomer is in the chair conformation, while the cyclohexane of thetrans isomer is found in a twisted boat conformation.     

CTAB与SDBS对碳酸锶粒子生长形态调控及机理研究

以表面活性剂CTAB和SDBS为化学添加剂,采用化学共沉淀法对碳酸锶晶体的生长形态进行调控,成功地制备出了实心的树枝状和花瓣为空心的花状碳酸锶粉体,并用X射线衍射(XRD)、扫描电子显微镜(SEM)和傅里叶变换红外光谱(FT-IR)等分析手段对样品进行了表征;最后重点对化学添加剂可能产生的影响机理进行了初步的探讨.结果表明,CTAB和SDBS在晶体生长的过程中能起到显著的影响作用,两者对粒子分散性能的作用效果相反,而且后者对晶体(013)和(213)晶面表面能降低的贡献明显大于前者.     

Crystal structure of Zn4Na(OH)6SO4Cl·6H2O

The structure of Zn₄Na(OH)₆SO₄Cl·6H₂O, a secondary mineral from Hettstedt, Germany, was determined by single-crystal X-ray diffraction. The crystals are hexagonal,a=8.413(8),c=13.095(24) Å, space group $P\bar 3$ , Z=2. The structure was refined to R=0.0554 and R_w=0.0903 for 970 reflections with I≥3σ(I). The structure can be described as zinc hydroxide layers perpendicular toc, from which sulfates and chlorides extend. The layers are held together by a system of hydrogen bonds involving hexaaquo Na⁺ ions which occupy the interlayer space.     

Synthesis and Crystal Structure of 5-[2-(6-bromonaphthalenyloxymethyl)]-3-(4-morpholinomethyl)-1,3,4-oxadiazole-2(3<Emphasis Type="Italic">H</Emphasis>)-thione

Abstract  The title compound, C₁₈H₁₈BrN₃O₃S, a derivative of 1,3,4-oxadiazole, crystallizes in the triclinic space group P-1 with unit cell parameters a = 6.8731(3), b = 8.9994(4), c = 15.7099(6) ?, α = 92.779(3)°, β = 130.575(3)°, γ = 107.868(4)°, Z = 2. The dihedral angle between the mean planes of the planar naphthyl and morpholine (chair) rings with the planar oxadiazol ring is 50.1(8) and 76.8(6)°, respectively. The planar naphthyl ring is twisted 52.2(5)° with the mean plane of the morpholine ring. A group of four intermolecular close contacts are observed between a bromine atom and hydrogen atoms from the closely packed naphthyl, morpholine and oxy–methyl groups in the unit cell. These molecular interactions in concert with an additional series of π–π stacking interactions that occur between the center of gravity of the two 6-membered rings of the naphthalene group influence the twist angles of each of these three groups. A MOPAC AM1 calculation of the conformation energy of the crystal structure [226.0128(9) kcal] compared to that of the minimum energy structure after geometry optimization [29.9744(1) kcal] reveals a significantly reduced value. The twist angles of the three groups above also change after the AM1 calculation giving support to the influence of both intermolecular C–H···Br short-range interactions and Cg π–π stacking interactions on these angles which therefore play a role in stabilizing crystal packing. Graphical Abstract  Crystal structure of 5-{[(6-bromonaphthalen-2-yl)oxy]methyl}-3-(morpholin-4-ylmethyl)-1,3,4-oxadiazole-2(3H)-thione, C₁₈H₁₈BrN₃O₃S, is reported and its geometric and packing parameters described and compared to a MOPAC computational calculation. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.     

Crystal structure of irisolidone from the flowers of Pueraia lobata

Irisolidone (5,7-dihydroxy-6,4′-dimethoxyisoflavone) was isolated from the flowers of Pueraia lobata and its crystal structure was examined by X-ray single crystal diffraction. The crystal structure of irisolidone is monoclinic, space group P2₁/c with a = 15.491(9) ?, b = 7.895(4) ?, c = 13.321(7) ?, β = 110.546(9)° and Z = 4. Hydrogen bonding and aromatic π–π stacking assemble the title compound into a three-dimensional networking structure.     

Synthesis of spinacine and spinacine derivatives: crystal and molecular structures of Nπ-hydroxymethyl spinacine and Nα-methyl spinaceamine

The natural amino acid L-Spinacine (4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine-6-carboxylic acid) has been synthesized following a new pathway which gives a chemically and optically pure product with an excellent yield. The crystal structures of a synthetic intermediate, N^π-hydroxymethyl-spinacine, and a spinacine derivative, N^α-methyl-spinaceamine, have been investigated through X-ray diffraction: Spi(πMeOH)·H₂O, monoclinicP2 _i,a=8.571(1),b=6.682(1),c=8.588(1) Å, and β=94.67(1)^o. Spm(αMe)·2HCl·H₂O, triclinicP l,a=7.492(4),b=10.799(3),c=7.040(2) Å, α=91.88(2), β=98.36(3) and γ=73.34(3)^o. Spi(πMeOH) crystallizes with a water molecule and displays a zwitterionic character. The carboxylate group is in equatorial position and forms a short electrostatic interaction of 2.618(2) Å between one of its oxygens and the protonated nitrogen of the tetrahydropyridine ring. The crystal packing is assured by strong O?H???O, O?H???N, N?H???N intermolecular hydrogen bonds and C?H???O close contacts. The biprotonated compounds Spm(αMe) crystallizes with two Cl^? anions and a water molecule. The positive charge on the imidazole ring is delocalized on the conjugated moiety N=C?N. The crystal is built up by clusters formed by two biprotonated Spm(αMe) molecules, four Cl^? anions and two water molecules linked together by hydrogen bonds.