摘要:

AbstractA new coordination polymer with sulfide moieties, [Co(ptmb)2] · 0.25H2O (ptmb=4–(4‐pyridylthiomethyl)‐benzoate), was synthesized by self‐assembly of Co(NO3)2· 6H2O with Hptmb under solvothermal conditions. X‐ray single crystal diffraction study shows that it is a 2D layer structure consisting of puckered rhombus grid with dimensions 1.175 n

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220112

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractThe open‐framework iron phosphate Fe2lllFe1.5ll,(PO4)3was hydrothermally synthesized and characterized by elemental analysis, IR, EPR, XPS and single crystal X‐ray diffraction analysis. The title compound crystallized in the triclinic, space groupP1 witha=0.64724(4) nm,b=0.79651(6) nm,c=0.94229(5) nm,a= 104.447(2)°.β=108.919(4)°.y=101.741(4)°, V=0.42302(5) nm3, Z= 1 andRI(wR2)=0.0307 (0.0793). Crystal data were collected on a Rigaku R‐AXIS RAPID IP diffractometer with Mo Ka(γ=0.071073 nm) at 293(2) K in the range of 2.43°<Õ<27.46°. The structure of 1 consists of 19 non‐hydrogen atoms including three and a half crystallographically independent Fe and three P atoms. Fe(1) connects its symmetrical Fe(1A) through bridging oxygen forming a dimer and the dimers are connected by Fe(4) forming an infinite staircase‐like chain. Fe(2) and Fe(3) connect the infinite chains into a layer with bridging oxygen. Layers are interconnected via Fe(4) forming the six‐membered and eight‐mem

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220113

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractA lariat crown ether ligand 7.16‐bis (2‐hydroxy‐5‐methylbenzyl)‐1,4,10,13‐tetraoxa‐7,16‐diazacyclooctadecane (Ll) has been prepared via one‐pot Mannich reaction. Its copper(II) complex Cu‐Ll was synthesized and characterized by elemental analysis, IR and UV‐visible spectroscopy. The crystal structure of the complex has been determined by X‐ray diffraction analysis. The result shows that the copper(II) ion is six‐coordinated by two nitrogen and four oxygen atoms, two from the crown ether and the other two from the deprotonated phenolate anions, forming an elongated octahedral complex. Electrochemical study indicates that the complex undergoes reversible

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220114

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractThe 2‐D heteronuclear coordination polymer {[Ag4Fe2(SCN)12(H2O)2] (inaH)2(H2O)2}n(1) (inaH is the abbreviation of protonated isonicotinic acid) with chemical formula C24Ag4Fe2N14O8S12has been synthesized and characterized by single crystal X‐ray diffraction, elemental analysis and IR spectroscopy. The Ag2S2rings connect two kinds of octahedral geometries of Fe(III) ions, [Fe(NCS)6]3–and Fe(H2O)2(NCS)4]−units with bridging thiocyanate ions leading to 2‐D [Ag4Fe2(SCN)12(H2O)22–anion framework. Four kinds of rings including the unprecedented thirty‐two membered Ag4Fe4(SCN)8rings share comers or edges in the 2‐D anion layer structure. All thiocyanates coordinate to the metal ions according to the HSAB principle with N atoms binding to the Fe(III) ions and with S atoms binding to Ag(I) ions. Pronoated ina cations stabilize the layer structure as counter ions and hydrogen bonds were formed within the pronoated in a cations dimer and between the dimers and the lattice waters. Crystal data:Mr=1560.44, triclinic,P1,a=0.76082(1) nm, b=0.9234 nm, c= 1.85611(4) nm,a=103.0170(10)°, β=93.7780(10)°,y=97.4080(10)°,V= 1.25385(3) nm3, Z=1, μ(Mo Kα)=2.650 mm−1,Dc,=2.067 g · cm−3,F(000)

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220115

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractThe structures of [MCl2(C6H4B3CH2COPh)2] [M=Zn(II) (1), Co(II) (2)]have been determined by X‐ray crystallography. They were characterized by elemental analysis, IR spectrum, electronic spectrum and thermogravimetric‐differential thermal analysis. They all crystallize in the triclinic system, space pupPi, with lattice parametersa=0.9449(2) nm,b=1.1291(2) nm,c=1.3637(3) nm, α=111.70(3)°, β= 94.33(3)°,y=90.97(3),Z=2 for compound 1;a=0.9437(2) nm,b=1.1277(2) nm,c=1.3650(3) nm,a=111.76(3)°, β=94.50(3)°,y=90.80(3)°,Z=2 for compound 2. The metal ions are all coordinated by two C1−‐ anions and two nitrogen atoms of 1‐benzoylmethyl‐bentriazole ligands. forming the distorted tetrahedral geometry. The Zn—Cl and Zn—N bond lengths are 0.2209(2), 0.2210(2) nm and 0.2059(4), 0.2067(4) nm. respectively. The CO‐Cl 3 and Co–N bond lengths are 0.2215(2). 0.2222(2) nm and 0.2028(5), 0.2045(5) nm. respectively. The thermogravimetric (TG) data indicate that they are nearly similar in TG curve, and there are not structural transitions in the two compounds. They all have a high thd stability. But, there is little difference in DTG (differential thermogravimetric) curves of those two compounds. Elemental analysis, electronic and IR spectra are in agreeme

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220116

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractA new Zn(II) mononuclear complex with tris(benzimidazol‐2‐yl‐methyl)amine (NTB) was synthesized with stoichiometry of [Zn(NTB)NO3]NO3· DIPY · DMF (DIPY : 4,4′‐dipyridyl). The complex was characterized by elemental analysis, UV and IR spectra. The crystal structure was determined by using X‐ray diffraction analysis. The crystal structure indicates that four N atoms and one O atom coordinate to zinc ion to construct a distorted trigonal‐dipyramid configuration. Three nonprotonated N atoms from imidazole groups are in the equatorial plane, one alkylamino N atom and one O atom from NO3−‐in the axial directions. The biological activity assay shows that this complex presents certain biological activity by means of pyrogallol autoxidation and it can be called a model compound of superox

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220117

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractFluorescence quenching processes of poly[2‐methoxy‐5–(2′ethyl‐hexoxy)‐p‐phenylene vinylene] (MEH‐PPV) in solution by electron acceptors, O2and acid, have been studied. Static quenching of the fluorescence from MEH‐PPV by an electron acceptor (DDQ or TCNE) occurs due to electron transfer from MEH‐PPV to the electron acceptor and this electron transfer quenching can be promoted by chloroform. Photooxidation takes place in the MEH‐PPV solution and singlet oxygen is an intermediate in the photooxidation. according to the results of ESR spectroscopy. Acid also plays an important role in the fluorescence quenching process of MEH‐PPV, by the protonation of the alkoxy groups

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220118

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractNucleoside is the main class of active components inCordyceps sinensis. Thin‐layer chromatography (TLC) is one of the most commonly used methods in pharmacopoeias for analyzing chemical components of herbal medicine. Since the isocratic elution method cannot be applied successfully in TLC analysis for separating all the nucleoside components, the stepwise gradient elution has been developed in this work to separate eight nucleoside standards with success. In this way, quantitative analyses of the samples ofCordyceps sinensiswere achieved via the proposed TLC procedure coupled with the scanning densitometric techniques of CAMAG and TLCQA methods for qualitative and quantitative analysi

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220119

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractThe methanolic extract from a Chinese endemicChrysanthemumplant,Dendranthema indicumvar.aromaticum, was found to show high antifeeding activity againstPieris brassicaeL., and by bioassay‐guided separation, the active component, B‐ring‐homo‐tonghaosu, 2–(2′.4′‐hexadiynylidene)‐1, 6‐dioxaspiro‐[4, 5]dec‐3‐ene (2) was isolated. Its structure was elucidated by comparing its spectroscopic data with those of 2 reported in the literatures. Furthermore new convenient total synthesis methods of B‐ring‐homo‐tonghaosu were also developed to confirm its structure and make its further application in crop protection available. In addition, extensive comparison of spectroscopic data showed that the structure of compound 21 reported in li

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220120

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY

摘要:

AbstractA novel class of fulgimide, (Z)‐4‐oxazolylfulgimide ((Z)‐1‐benzyl‐4–isopropylidene‐3–[1–(2–aryl‐5–methyl‐oxazolyl)ethylidene]tetrahydropyrrole‐2, 5–dione), was synthesized by the reaction of (Z)‐4–oxazolyl fulgide (4–isopropylidene‐3–[1–(2–aryl‐5–methyloxazolyl)ethylidene]tetrahydrofuran‐2, 5–dione) with benzyl amine. Photochromic property of (Z)4–oxazolylfulgimide was studied. Compared with (Z)‐4–oxazolylfulgide, the absorption maximum of the colored form of (Z)‐4–oxazolylfulgimide is bathochromic‐shifted. Substituents on the aryl ring affect the absorption maximum o

ISSN:1001-604X    

DOI:10.1002/cjoc.20040220121

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2004

数据来源: WILEY