检索结果-南通市图书馆

Synthesis and Crystal Structure of Copper(Ⅱ) Compound with Didentate Schiff-base Ligand

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2004年第1期23卷 25-28页

作者： YILong DINGBin CHENGPeng DepartmentofChemistry NankaiUniversityTianjin300071China DepartmentofChemistry NankaiUniversityTianjin300071ChinaTel：022-23509957Fax：022-23502458E-mail：pcheng@***

The title complex [Cu(L)2] (HL=4-salicylideneamino-3,5-dimethanol-1,2,4-triazole) was synthesized by the reaction of Cu(CH3COO)22H2O with 4-salicylideneamino-3,5-dimethanol- 1,2,4-triazole in the methanol. The single-crystal X-ray study reveals that the compound crystallizes in monoclinic, space group P21/n with a = 11.746(5), b = 8.145(3), c = 12.786(5) ? b = 106.64(1), V = 1172(1) ?, Z = 2, Dc = 1.581 g/cm3, m = 0.989 mm-1, F(000) = 574, C22H22Cu- N8O6, Mr = 558.02, T = 293(2) K, R = 0.0394 and Rw = 0.0835 for 2376 observed reflections with I > 2s(I). The complex comprises a four-coordinated copper(II) center, with an N2O2 planar coordi- nation environment. The molecules are connected by hydrogen bonds to form one-dimensional chains which are further linked to form a two-dimensional plane.

关键词： crystal structure copper(Ⅱ) complex hydrogen bond

Synthesis, Structure, and Magnetic and Optical Properties of a Novel Chain-like Oxalate-bridging Samarium Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第9期26卷 1112-1117页

作者：蔡丽珍郭国聪吴阿清付明来董振超 MATSUSHITA Akiyuki State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China National Institute for Materials Science 1-2-1 Sengen

A new lanthanide complex [Sm（C2O4）（H2O）5]nCln·2nH2O has been obtained by hydrothermal synthetic method. The crystal belongs to monoclinic, space group P21/n, with a = 7.5438（6）, b = 14.3201（11）, c = 10.8608（9）A, β = 94.565（4）°, V = 1169.55（16）A^3, C2H14ClO11Sm, Mr = 399.93, Z = 4, Dc = 2.271 g/cm^3, μ = 5.290 cm^-1, F（000） = 772, the final R = 0.0271 and wR = 0.0632 for 1880 observed reflections with I 〉 2σ（I）. X-ray crystal analysis reveals that each Sm（III） atom is nine-coordinated by four oxygen atoms from two oxalate ligands and five coordinated water molecules in a distorted tricapped trigonal prism. The chain-like structure of lanthanide oxalate is reported for the first time. The fluorescent property and magnetic behavior of the title compound were investigated. The θ of –14.3（2）° and J of –0.26 cm^-1 indicate antiferromagnetic interaction in the molecule.

关键词： lanthanide luminescent magnetic oxalate structure

Synthesis and Crystal Structure of Mn(phen)(CF_3COO)(H_2O)_3·NO_3

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2004年第8期23卷 908-911页

作者：王文国陈昌能刘秋田 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

The mononuclear manganese complex Mn(phen)(CF3COO)(H2O)3NO3 (C14H14- O8N3F3Mn) has been synthesized, where phen = 1,10-phenanthroline. The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 8.8550(3), b = 10.6529(3), c = 19.8763(2) ? ?= 97.762(2), V = 1857.78(8) 3, Z = 4, Mr = 464.22, Dc = 1.660 g/cm3, ?= 0.789 mm-1, F(000) = 940, T = 293(2) K, R = 0.0764 and wR = 0.2441 for 1995 observed reflections with I > 2s(I). In the crystal the manganese atom is six-coordinated by two chelated nitrogen atoms from phenanthroline, three oxygen atoms from water molecules and one oxygen atom from trifluoroacetate, completing an octahedral geometry.

关键词： manganese complex crystal structure trifluoroacetate

Synthesis and Crystal Structure of a Salicylaldehyde Ethylene Diamine Schiff Base Manganese (Ⅲ) Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2002年第3期21卷 256-259页

作者：马成丙刘秧田等 Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences State Key Laboratory of Structural Chemistry Fuzhou 350002

The title compound, [Mn(salen)(salicyl)]?.5H2O ( H2salen = N, N?ethylenebis- (salicylideneaminato), Hsalicyl = salicylaldehyde), has been obtained from the reaction system containing (o-HOC6H4CH=NCH2)2, o-HOC6H4CHO and Mn(ClO4)2?H2O in EtOH solvent and structurally characterized. It crystallizes in the monoclinic, space group P21/c with a = 13.0548(4), b = 13.9254(4), c = 11.6630(1) ? b = 105.199(2)? V = 2046.09(9) ?, Z = 4, C23H22MnN2O5.5, Mr = 469.37, Dc = 1.524 g/cm3, F(000) = 972, m = 0.687mm-1 . R = 0.0630 and wR = 0.1142 for 1901 observed reflections with I >2(I). The Mn(Ⅲ) is coordinated by N(1), N(2), O(1) and O(2) of the Schiff base ligand and phenolate O atom of salicylaldehyde with O(3)Mn distance of 2.050(4) , forming a relatively rare five-coordinate square-pyramidal structure.

关键词：席夫碱锰配合物合成晶体结构

Time-varying formation finite-time tracking control for multi-UAV systems under jointly connected topologies

在线全文

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2017年第4期10卷 478-490页

作者： Tianyi Xiong Zhiqiang Pu Jianqiang Yi Institute of Automation Chinese Academy of SciencesBeijingChina and University of Chinese Academy of SciencesBeijingChina Institute of Automation Chinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina

Purpose–The purpose of this paper is to investigate the time-varying finite-time formation tracking control problem for multiple unmanned aerial vehicle systems under switching topologies,where the states of the unmanned aerial vehicles need to form desired time-varying formations while tracking the trajectory of the virtual leader in finite time under jointly connected ***/methodology/approach–A consensus-based formation control protocol is constructed to achieve the desired *** this paper,the time-varying formation is specified by a piecewise continuously differentiable vector,while the finite-time convergence is guaranteed by utilizing a non-linear *** on the graph theory,the finite-time stability of the close-loop system with the proposed control protocol under jointly connected topologies is proven by applying LaSalle’s invariance principle and the theory of homogeneity with ***–The effectiveness of the proposed protocol is verified by numerical ***,the proposed protocol can successfully achieve the predefined time-varying formation in finite time under jointly connected topologies while tracking the trajectory generated by the ***/value–This paper proposes a solution to simultaneously solve the control problems of time-varying formation tracking,finite-time convergence,and switching topologies.

关键词： Finite time Formation tracking control Jointly connected topologies Multi-UAV system

Synthesis and Structural Characterization of a Salt {[Co(Phen)_3][Mo_2S_2(μ-S)_2(edt)_2]}_2·(DMSO)_2·(Et_2O)(Phen = 1,10-Phenanthroline, edt=Ethane-1,2-dithiolate)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第7期24卷 773-778,736页

作者： ZHANGWen-Hua RENZhi-Gang ZHANGYong SchoolofChemistryandChemicalEngineering SuzhouUniversit） Suzhou215006 China

Reaction of [Et4N]2[Mo2S2(μ-S)2(edt)2] with CoCl2?6H2O and Phen in MeCN followed by recrystallization in DMSO/Et2O gave rise to dark-red block crystals of {[Co(Phen)3]- [Mo2S2(μ-S)2(edt)2]}2?(DMSO)2?(Et2O) 1 (C88H86Co2Mo4N12O3S18). 1 crystallizes in the monoclinic system, space group P21/c with a = 24.631(4), b = 16.117(3), c = 24.791(4) ?, β = 92.835o, V = 9829.3(3) ?3, Z = 4, Mr = 2438.57, Dc = 1.648 g/cm3, F(000) = 4928, μ = 12.61 cm-1, R = 0.0936 and wR = 0.1682 for 12998 observed reflections with I > 2.0σ(I). In the structure of 1, the Co atom of the [Co(Phen)3]2+ dication is octahedrally coordinated by three Phen ligands. The Mo atom of the [Mo2S2(μ-S)2(edt)2]2- dianion is coordinated by two μ-S, one terminal S and two S atoms from edt, forming a distorted square pyramidal geometry. The mean Co–N and Mo…Mo bond distances are 2.139 and 2.872 ?, respectively.

关键词： molybdenum cluster sulfur cobalt crystal structure synthesis

A Novel Pyrazoline-based Starburst Amorphous Molecular Material

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2005年第3期16卷 423-426页

作者： ChangQiMA YiShanYAO XueSongWANG BaoWenZHANG YiCAO TechnicalInstituteofPhysicsandChemsitry ChineseAcademyofSciencesBeijing100101

A pyrazoline-containing starburst molecule, 4,4’,4"-tris[(1,3-diphenyl-4,5-dihydro-1H- pyrazol)-5-yl]-triphenylamine (Tris-5-DPP), was synthesized in a facile way, which can form amorphous thin films with glass trans... 详细信息

关键词：吡唑啉星放射状分子无定形薄膜合成 4,4',4''-三[(1,3-联苯基-4,5-二氢-1H-吡唑基)-5]-三苯胺

Two New Eremophilenolides from Ligularia tongolensis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2005年第8期16卷 1053-1055页

作者： Yi Feng HAN Dong Qing FEI Kun GAO Zhong Jian JIA State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000

Chemical investigation of L. tongolensis afforded two new eremophilenolides, which were identified as 3β-（2＇-methylbutanoyloxy）-8βH-eremophil-7（11）-en-12, 8α（14, 6α）-diolide （1）and 8βH-eremophil-3, 7（11）-dien-12, 8α （14, 6α）-diolide （2）. Their structures were established by spectroscopic methods including 2D NMR experiments.

关键词： Ligularia tongolensis Compositae eremophilenolide sesquiterpene.

Hydrothermal Synthesis and Crystal Structure of a New Sandwich-type Molybdenum Phosphate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2003年第2期22卷 137-142页

作者：杨文斌卢灿忠吴传德庄鸿辉 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

The crystal structure of the title compound, [enH2][Fe{MoⅤ6O12(OH)3(HPO4)- (H2PO4)3}2]6en6H2O (en = H2NCH2CH2NH2), hydrothermally synthesized from a mixture of Na2MoO42H2O, Fe2(SO4)3, H3PO4, H2N(CH2)2NH2 and water, has been determined by single- crystal X-ray diffraction. The crystal is of triclinic, space group P?with a = 11.9014(1), b = 13.4246(2), c = 13.8719(2) , a = 87.465(1), b = 69.981(1), g = 64.960(1)? V = 1873.46(4) 3, Z = 1, Mr = 2997.89, F(000) = 1466, m = 2.427 mm-1 and Dc = 2.657 g/cm3. The final R = 0.0404 for 5570 observed reflections (I > 2s(I)). The structural analysis reveals that each cluster anion contains two coplanar {Mo6} rings of six edge-sharing Mo(O5OH) octahedra, and the two {Mo6} rings are linked together through one octahedral FeⅡ ion to generate a sandwich-type cluster with rigorous () symmetry. Moreover, these clusters are further linked into a three-dimensional frame- work by hydrogen bonds.

关键词： sandwich-type molybdenum (Ⅴ) phosphate hydrothermal synthesis hydrogen bond three-dimensional network crystal structure