检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 2005年第8期24卷 905-908页

作者： li Dong-Jiao GAO Dong-Zhao li li-cun liAO Dai-Zheng JIANG Zong-Hui YAN Shi-Ping Department of Chemistry Nankai University ChinaTianjin 300071 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences ChinaFuzhou Fujian 350002

A new Nd（Ⅲ） nitronyl nitroxide complex [Nd（NIT2Py）2（NO3）3] （NIT2Py = 2-（2＇-pyridyl）-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide） has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.396（4）, b =11.134（4）, c = 23.360（7） A°, β = 98.178（6）°, V= 3191.2（18） A°^3, C24H32N9NdO13, Mr = 798.83, Dc =1.663 g/cm^3, μ（MoKa） = 1.704 mm^-1, F（000） = 1612, Z = 4, the final R = 0.0425 and wR = 0.0957 for 6532 independentreflections with Rint = 0.0642 and 4552 observed reflections （I 〉 2σ（I））. The complex exists as discrete mononuclear molecules and the neodymium（Ⅲ） ion is ten-coordinated with three bidentate nitrate anions and two radical ligands （NIT2Py） via bidentate chelating *** optical properties of the complex are discussed.

关键词： neodymium(Ⅲ)complex nitronyl nitroxide radical crystal structure optical properties

Synthesis and Crystal Structure of a New One-dimensional Zn(II) Nitronyl Nitroxide Complex Bridged by Pyridine-2,4-dicarboxylate Anion

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第6期25卷 735-739页

作者： GAO Dong-Zhao li li-cun liAO Dai-Zheng JIANG Zong-Hui YAN Shi-Ping Department of Chemistry Nankai University Tianjin 300071 China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou 350002 China

A new one-dimensional （1-D） Zn（Ⅱ） nitronyl nitroxide complex bridged by pyridine-2,4-dicarboxylate anion, [Zn（NIT4Py）（2,4-PDA）（H2O）2], （NIT4Py = 2-（4′-pyridyl）-4,4,5,5- tetramethylimidazoline-1-oxyl-3-oxide and 2,4-PDA = pyridine-2,4-dicarboxylate anion）, has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P21/c with a = 16.834（2）, b = 7.4376（10）, c = 18.295（3） A, β = 102.848（2）°, V = 2233.2（5） A^3, C19H23N4O3Zn, Mr = 500.78, Dc = 1.489 g/cm^3,μ（MoKa） = 1.152 mm^-1, F（000） = 1036, Z = 4, the final R = 0.0390 and wR = 0.0915 for 3234 observed reflections. In the complex, each zinc（Ⅱ） ion is six-coordinated by one nitrogen atom of the radical ligand （NIT4Py）, one nitrogen atom and two oxygen atoms of two 2,4-PDA anions and two oxygen atoms of two water molecules. Each 2,4-PDA anion bridges two Zn（Ⅱ） ions via a tridentate mode into a 1-D chain, and these 1-D chains are further linked into a 2-D network via hydrogen-bonding interactions.

关键词： zinc(Ⅱ) complex nitronyl nitroxide radical crystal structure pyridine-2,4-dicarboxylic acid

Copper(Ⅱ)-lanthanoid(Ⅲ)-copper(Ⅱ) trinuclear complexes with N,N'-bis(2-aminopropyl)-oxamido ligand

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1991年第5期9卷 410-414页

作者： liAO Dai-Zheng li li-cun WANG Geng-lin Department of Chemistry Nankai UniversityTianjin 300071

Six novel μ-oxamido trinuclear complexes, namely Cu_2(oxap)_2Ln(ClO_4)_3 (Ln: La, Pr, Nd, Gd, Yb, Ho), where oxap is N,N'-bis(2-aminopropyl)oxamido, have been synthesized. The complex Cu_2(oxap)_2Gd(ClO_4)_3 was characterized with variable temperature magnetic susceptibility (4-300 K). The exchange integrals J (Cu-Gd) and J'(Cu-Cu) were found to be 0.83 cm^(-1) and -1.62 cm^(-1), indi- cating that very weakly ferromagnetic spin-exchange interaction operates between Cu(II) and Gd (III) ions.

关键词： Cu lanthanoid oxamido ligand trinuclear complexes with N,N Copper aminopropyl bis copper

Synthesis and Crystal Structure of a 1-D Coordination Polymer {[Cu(NIT4py)_2(ip)]·6H_2O}_n

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第2期25卷 214-218页

作者： WANG Shu-Ping GAO Dong-Zhao liAO Dai-Zheng JIANG Zong-Hui YAN Shi-Ping li li-cun Department of Chemistry Nankai University Tianjin 300071 China State Key Laboratory of Structural Chemistry Fujian Instituteof Research on the Structure of MatterThe Chinese Academy of Sciences Fuzhou 350002 China

A new complex { [Cu（NIT4py）2（ip）]·6H2O }, （NIT4py=2-（4＂-pyridinyl）-4,4,5,5-tetra methylimidazoline-1-oxyl-3-oxide and ip = isophthalate dianion） has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in orthorhombic, space group Cmcm with a = 25.161（3）, b =10.045（1）, c = 15.450（2） A°, C32H48N6O14CU, Mr = 804.30, V= 3904.8（8） ,A°^3, Z = 4, De = 1.368 g/cm^3, μ（MoKa） = 0.630 mm^-1, F（000） = 1692, the final R = 0.0326 and wR = 0.0787 for 1843 independent reflections with Rint = 0.0372. Each Cu（Ⅱ） ion is four-coordinated by two carboxylate oxygen atoms and two pyridyl-N atoms from NIT4py radicals to furnish a rhombus geometry. The central Cu（Ⅱ） ion is located at an inversion center and a crystallographic two-fold axis. Each isophthalate dianion binds two Cu（Ⅱ） ions in bis-monodentate mode, leading to a 1-D chain, a＇ these 1-D chains are further linked into a 2-D network via hydrogen-bonding interactions.

关键词： crystal structure nitronyl nitroxide radical copper(Ⅱ) coordination polymer isophthalate

Synthesis and Crystal Structure of Dicopper(II) Compound Containing Oxalate and Reduced Imino Nitroxide Radicals

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3期23卷 296-299页

作者： lili-cun DONGChao-ling liAODai-Zheng JIANGZong-Hui YANShi-Ping DepartmentofChemistry NankaiUniversityTianjin300071China

A new dicopper(II) compound with oxalate and reduced imino nitroxide radicals [Cu2(m-C2O4)(Him2-py)2(H2O)2](NO3)2 (Him2-py=1-hydroxy-2-(2-pyridyl)-4,4,5,5-tetramethyli- midazoline) has been synthesized and its crystal structure was determined by X-ray diffraction method. The complex crystallizes in monoclinic, space group P21/n with a = 9.913(4), b = 19.057(8), c = 10.169(4) ? b = 114.292(7), V = 1751(1) 3, C26H38Cu2N8O14, Mr = 813.72, Dc = 1.543 g/cm3, m(MoKa) = 1.290 mm-1, F(000) = 840, Z = 2, the final R = 0.0398 and wR = 0.0986 for 1878 observed reflections (I>2s(I)). The imino nitroxide 2-(2-pyridyl)-4,4,5,5-tetramethyl- imidazoline-1-oxyl (im2-py) is reduced in the reaction to yield Him2-py which consists of oxalato-bridged centrosymmetric [Cu2(m-C2O4)(Him2-py)2(H2O)2]2+ ions and noncoordinated NO3- anions. Each copper(II) ion is in a distorted tetragonal pyramid environment: two nitrogen atoms from Him2-py and two oxygen atoms from the oxalate group are in the basal plane, and one water molecule at the axial position.

关键词： crystal structure reduced nitroxide radical dicopper compound oxalate bridge

Synthesis and Crystal Structure of a New Zn(II) Nitronyl Nitroxide Complex [Zn(NIT4Py)(PDA)(H_2O)_3]

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第2期25卷 224-228页

作者： GAO Dong-Zhao WANG Shu-Ping CHEN Jin li li-cun liAO Dai-Zheng JIANG Zong-Hui YAN Shi-Ping Department of Chemistry Nankai University Tianjin 300071 China State Key Laboratory of Structural Chemistry Fujian Institute of Researchon the Structure of Matter The Chinese Academy of Sciences Fuzhou 350002 China

A new Zn（Ⅱ） nitronyl nitroxide complex [Zn（NIT4Py）（PDA）（HzO）3] （NIT4Py = 2-（4＇-pyridyl）-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, H2PDA = pyridine-2,5-dicarboxylic acid） has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P2 1/c with a = 16.881（8）, b = 7.356（4）, c = 18.857（9） A°,β = 108.616（6）°, V = 2219.1 （19）A°^3 ,C 19H25N4O9Zn, Mr = 518.80, Dc = 1.553 g/cm^3, μ（MoKa） = 1.165 mm^-1, F（000） = 1076, Z = 4, the final R = 0.0269 and wR = 0.0715 for 3193 observed reflections with I 〉 2σ（I）. The complex exists as discrete mononuclear molecules and the zinc（Ⅱ） ion is six-coordinated with one radical ligand （NIT4Py）, one bidentate pyridine-2,5-dicarboxylate anion and three water molecules. A three-dimensional network structure is formed through the intermolecular interactions.

关键词： zinc(Ⅱ) complex nitronyl nitroxide radical crystal structure intermolecularinteraction

Synthesis and Crystal Structure of a 1D Coordination Polymer [Co(nitmpy)_2(tp)(H_2O)_2]_n

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6期23卷 519-522页

作者：李立存李菁姜宗慧廖代正阎世平 Department of Chemistry Nankai University Tianjin 300071 ChinaState Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China Department of Chemistry Nankai University Tianjin 300071 China

A new complex of formula [Co(nitmpy)2(tp)(H2O)2]n (nitmpy = 2-(3-pyridyl)- 4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide and tp = terephthalato dianion) has been synthesized and structurally characterized. The complex crystallizes in monoclinic, space group P21/n with a = 10.647(3), b = 11.093(3), c = 16.647(5) ? b = 106.185(6), V = 1888.2(10) 3, C32H40CoN6O10, Mr = 727.63, Dc = 1.280 g/cm3, m(MoKa) = 0.513 mm-1, F(000) = 762, Z = 2, the final R = 0.0549 and wR = 0.1265 for 1753 observed reflections (I > 2s(I)). The crystal structure consists of neutral infinite chains where the Co(nitmpy)2(H2O)2 units are linked by terephthalate ligands, and the 1-D chains develop into two-dimensional network via the hydrogen bond interactions.

关键词： crystal structure nitronyl nitroxide cobalt complex terephthalato

Two heterospin complexes consisting lanthanides and nitronyl nitroxide radicals

在线全文

学校读者我要写书评

暂无评论

Two heterospin complexes consisting lanthanides and nitronyl...

Two new hetero-tri-spin chain compounds based on the nitronyl nitroxide radical

中国化学会第七届全国结构化学学术会议

作者： Hong-dao li li-cun li Department of Chemistry Nankai University

Organic radicals,especially the nitronyl nitroxide radicals,have attracted a great deal of attention in the field of molecular ***,nitronyl nitroxide radicals can act as coordination ligands to bridge metal *** far,some interesting radical-metal complexes have been *** order to explore new radical-metal system,here,we report two new nitronyl

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Two new hetero-tri-spin chain compounds based on the nitrony...

Two new one-dimensional compounds based on pyridinone-substituted nitronyl nitroxide radical

中国化学会第八届全国配位化学会议

作者： Jing Xie cun li Guifang Sun Meng Yang li-cun li Department of Chemistry Nankai University

When compared with pure transition metal or lanthanide complexes,3 d-4 f heterometallic compounds combine the advantages of favorable magnetic coupling between the metal centres and the high magnetic anisotropy carried by 4 f ions,thus providing more possibilities to improve the blocking *** addition,molecular magnetic systems introducing nitronyl nitroxide radicals could enhance magnetic coupling owing to their two NO *** we report two new nitronyl nitroxide bridged 3 d-4 f magnetic chain compounds of[Ln(hfac) Zn(hfac)(NIT-Pyrim)](Ln=Gd(1),Dy(2);hfac=hexafluoroacetylacetonate,NIT-Pyrim =(2-pyrimidine-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide).Single crystal X-ray crystallographic analysis reveals that complexes 1 and 2 consist of 1 D chains built up by Ln(hfac) and Zn(hfac) units bridged by the radical ligands through their NO moieties and the nitrogen *** structure of complex 1 is shown in Figure *** Gd atom is eight-coordinated by six O atoms from three bidentate hfac ligands,two O atoms from the nitroxide *** Zn is six coordinated with four O atoms from two hfac ligands and two N atoms from pyrimidine ring of the nitroxide *** studies show that there exist ferromagnetic exchange couplings between the coordinated NO groups of radical ligands and Ln ions.

关键词： hetero-tri-spin nitronyl nitroxide radical magnetization

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Two new one-dimensional compounds based on pyridinone-substi...