共查询到20条相似文献,搜索用时 31 毫秒
1.
R. Ruloff L. Beyer F. Dietze E. Hoyer K. Arnold W. Gründer Manuela Wagner 《无机化学与普通化学杂志》1995,621(5):807-811
Chelate Formation of N-Tris(2-aminoethyl)amine-N′,N′,N″,N″,N?,N?-hexaacetic Acid (H6TTAHA) and N-(Pyrid-2-yl-methyl)ethylenediamine-N,N′,N′-triacetic Acid (H3PEDTA) with Gadolinium(III) – Syntheses, Stability Constants, and NMR-Relaxivities The chelate formation of N-tris(2-aminoethyl)amine-N′,N′,N″,N″,N?,N?-hexaacetic acid (H6TTAHA) and N-(pyrid-2-yl-methyl)ethylenediamine-N,N′,N′-triacetic acid (H3PEDTA) with gadolinium(III) has been studied potentiometrically in aqueous solution at 25°C and μ = 0.1 (KCl). [Gd(TTAHA)]3?: 1gβM/ML = 19.0; {H[Gd(TTAHA)]}2?: 1gKH/MHL = 8.30; [Gd(PEDTA)]: 1gβM/ML = 15.56. Both 1 : 1 gadolinium(III) complexes were isolated as Na2H[Gd(C18H24N4O12)] · 3.5 H2O and [Gd(C14H16N3O6)] · 3 H2O, respectively. Their 1H-NMR relaxivities [1 · mmol?1 · s?1] ({H[Gd(TTAHA)]}2?: 9.5; [Gd(PEDTA)]: 8.8) offer promising applications for 1H-NMR imaging. 相似文献
2.
Jaromír Marek Pavel Kopel Zdenk Trvní
ek 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(12):m558-m560
In the crystal structure of the title compound, [N,N′‐bis(3‐aminopropyl)ethylenediamine‐κ4N,N′,N′′,N′′′][1,3,5‐triazine‐2,4,6(1H,3H,5H)‐trithionato(2−)‐κ2N,S]zinc(II) ethanol solvate, [Zn(C8H22N4)2(C3HN3S3)]·C2H6O, the ZnII atom is octahedrally coordinated by four N atoms [Zn—N = 2.104 (2)–2.203 (2) Å] of a tetradentate N‐donor N,N′‐bis(3‐aminopropyl)ethylenediamine (bapen) ligand and by two S and N atoms [Zn—S = 2.5700 (7) Å and Zn—N = 2.313 (2) Å] of a trithiocyanurate(2−) (ttcH2−) dianion bonded as a bidentate ligand in a cis configuration. The crystal structure of the compound is stabilized by a network of hydrogen bonds. 相似文献
3.
在水乙醇混合溶剂中,首次得到了2-羰基丙酸水杨酰腙、1,10-菲啰啉与硝酸钆形成的配合物[Gd(C10H9N2O4)(C10H8N2O4)(H2O)3]2·phen·4H2O,并测试了其单晶结构。该配合物属三斜晶系,空间群为P-1。每个配合物分子中有两个九配位的钆的结构单元,每个钆离子与两个三齿配体2-羰基丙酸水杨酰腙(分别以负一价和负二价形式)和三个水分子配位。每个钆单元在空间呈扭曲的单帽四方反棱柱。同时还有一个游离的1,10-菲啰啉存在于晶格中,通过氢键与配位水作用。生物活性试验表明该配合物对三种病原菌有一定的抑菌活性。 相似文献
4.
Molecular Structures of Copper(II) and Iron(III) Chloro Complexes with di- and monoprotonated N-(pyrid-2-ylmethyl)ethylenediamine-N,N′,N′-triacetate (H2pedta?; Hpedta2?) The molecular structures of two complexes of di- and monoprotonated N-(pyrid-2-ylmethyl)ethylenediamine-N,N′,N′ -triacetate (pedta3?) with CuII and FeIII as central atoms have been determined by single crystal X-ray diffraction methods. Both complexes have a distorted octahedral coordination with H2pedta? and Hpedta2? as pentadentate ligands and a chloride ion occupying the sixth coordination site. The different oxidation states of the central atoms result in a completely different coordination behaviour of the carboxyl groups. In both complexes one of the ? CH2? COOH groups is uncoordinated. In the FeIII complex, the central atom is coordinated by the hydroxylic O atoms of the deprotonated carboxyl groups. Contrary to this in the CuII complex, the central atom is coordinated by the carbonylic O atoms. One of the coordinated carboxyl groups is protonated and the other is deprotonated. All protonated carboxyl groups in both complexes form intermolecular hydrogen bonds. 相似文献
5.
Dorcas M. M. Farrell George Ferguson Alan J. Lough Christopher Glidewell 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(1):o6-o8
In the hydrated adduct N,N′‐dimethylpiperazine‐1,4‐diium bis(3‐carboxy‐2,3‐dihydroxypropanoate) dihydrate, [MeNH(CH2CH2)2NHMe]2+·2(C4H5O6)?·2H2O or C6H16N22+·2C4H5O6?·2H2O, formed between racemic tartaric acid and N,N′‐dimethylpiperazine (triclinic P, Z′ = 0.5), the cations lie across centres of inversion. The anions alone form chains, and anions and water molecules together form sheets; the sheets are linked by the cations to form a pillared‐layer framework. The supramolecular architecture thus takes the form of a family of N‐dimensional N‐component structures having N = 1, 2 or 3. 相似文献
6.
《Journal of Coordination Chemistry》2012,65(17):3093-3100
The Mn(III) salen complex [Mn(salen)(H2O)2](dcbp)0.5 · H2O (dcbp = 4,4-dicarboxy-2,2-bipyridine, salen = N,N′-ethylenebis-salicylideneaminato) has been isolated under hydrothermal conditions and is structurally characterized. The complex is formed by three independent units, one [Mn(salen)(H2O)2], one H2dcbp, and one guest water molecule, which are further interconnected by hydrogen-bond interactions to form a 3-D supramolecular architecture. IR spectra, UV-Vis spectra, and variable temperature magnetic susceptibility of the complex have been studied. The magnetic study indicated a weak antiferromagnetic interaction between the [Mn(salen)(H2O)2] molecules. 相似文献
7.
Hong‐Chang Liang Marcel M. Hetu Kraig A. Wheeler Lev N. Zakharov Arnold L. Rheingold 《Acta Crystallographica. Section C, Structural Chemistry》2006,62(11):m519-m521
In the title compound, [Zn(C2H3N)(C16H21N3O)](ClO4)2·H2O, the ZnII ion is coordinated by two pyridyl N atoms, one amine N atom, and an ethanol O atom from the N,N′,N′′,O‐tetradentate 2‐[bis(2‐pyridylethyl)amino]ethanol donor ligand. The fifth coordination site is filled by an acetonitrile N atom, and there is one solvent water molecule in the asymmetric unit. The 2+ charge of the cationic portion of the complex is balanced by two perchlorate counter‐anions. 相似文献
8.
Huai‐Gang Zhu Guang Yang Xiao‐Ming Chen 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):969-970
Di‐2‐pyridyl ketone reacts with CdBr2 in water to form the title centrosymmetric dinuclear complex, [Cd2Br4(C11H10N2O2)2]·3H2O, in which each metal atom is coordinated by an N,O,N′‐chelated di‐2‐pyridylmethanediol ligand, two bridging bromo ligands and one terminal bromo ligand in a distorted octahedral geometry. 相似文献
9.
Dennis H. Mayo Yang Peng Peter Zavalij Kit H. Bowen Bryan W. Eichhorn 《Acta Crystallographica. Section C, Structural Chemistry》2013,69(10):1120-1123
The disproportionation of AlCl(THF)n (THF is tetrahydrofuran) in the presence of lithium amidinate species gives aluminium(III) amidinate complexes with partial or full chloride substitution. Three aluminium amidinate complexes formed during the reaction between aluminium monochloride and lithium amidinates are presented. The homoleptic complex tris(N,N′‐diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)3] or Al{PhC[N(i‐Pr)]2}3, (I), crystallizes from the same solution as the heteroleptic complex chloridobis(N,N′‐diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)2Cl] or Al{PhC[N(i‐Pr)]2}2Cl, (II). Both have two crystallographically independent molecules per asymmetric unit (Z′ = 2) and (I) shows disorder in four of its N(i‐Pr) groups. Changing the ligand substituent to the bulkier cyclohexyl allows the isolation of the partial THF solvate chloridobis(N,N′‐dicyclohexylbenzimidamido)aluminium(III) tetrahydrofuran 0.675‐solvate, [Al(C19H27N2)2Cl]·0.675C4H8O or Al[PhC(NCy)2]2Cl·0.675THF, (III). Despite having a twofold rotation axis running through its Al and Cl atoms, (III) has a similar molecular structure to that of (II). 相似文献
10.
Wang‐Ting Wu Feng‐Ying Chen Shui‐Yang He Huai‐Ming Hu Meng‐Lin Yang Yao‐Yu Wang 《中国化学》2006,24(5):711-713
The binuclear praseodymium(III) complex with N‐(1‐carboxyethylidene)‐salicylhydrazide (C10H10N2O4, H2L) was prepared in H2O‐C2H5OH mixed solution, and the crystal structure of [Pr2L2(HL)2(H2O)4]·3H2O·C6H6 was determined by X‐ray single crystal diffraction. The crystal complex crystallizes in the triclinic system with space group P‐1, and in the structure each Pr atom is 9‐coordinated by carboxyl O and acyl O and azomethine N atoms of two tridentate ligands to form two stable five‐membered rings sharing one side in keto‐mode and two water molecules. The coordination polyhedron around Pr3+ was described as a monocapped square antiprism geometry. In an individual molecule, four tridentate ligands were coordinated by two negative univalent (HL) and two bivalent forms (L) respectively. Two negative univalent ligands were coordinated via μ2‐bridging mode. 相似文献
11.
Melanie A. Short Roger D. Sommer Alec J. Falzone Tao Huang Walter W. Weare Jennifer L. Roizen 《Acta Crystallographica. Section C, Structural Chemistry》2019,75(6):717-722
While six‐coordinate iron(III) porphyrin complexes with pyridine N‐oxides as axial ligands have been studied as they exhibit rare spin‐crossover behavior, studies of five‐coordinate iron(III) porphyrin complexes including neutral axial ligands are rare. A five‐coordinate pyridine N‐oxide–5,10,15,20‐tetraphenylporphyrinate–iron(III) complex, namely (pyridine N‐oxide‐κO)(5,10,15,20‐tetraphenylporphinato‐κ4N,N′,N′′,N′′′)iron(III) hexafluoroantimonate(V) dichloromethane disolvate, [Fe(C44H28N4)(C5H5NO)][SbF6]·2CH2Cl2, was isolated and its crystal structure determined in the space group P. The porphyrin core is moderately saddled and the Fe—O—N bond angle is 122.08 (13)°. The average Fe—N bond length is 2.03 Å and the Fe—ONC5H5 bond length is 1.9500 (14) Å. This complex provides a rare example of a five‐coordinate iron(III) porphyrin complex that is coordinated to a neutral organic ligand through an O‐monodentate binding mode. 相似文献
12.
Kaliyamoorthy Panneerselvam Tian‐Huey Lu Ta‐Yung Chi Shu‐Fang Tung Chung‐Sun Chung 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(3):301-302
The crystal structure of the title complex, [Cu(C12H28N4)(H2O)2]Cl2·2H2O, has been determined. The CuII atom is octahedrally coordinated by the four N atoms of the tetradentate macrocyclic ligand in equatorial positions and by the O atoms of two water molecules in axial positions. The crystal structure is stabilized by a three‐dimensional network of hydrogen bonds. 相似文献
13.
Mehrdad Pourayoubi James A. Golen Mahnaz Rostami Chaijan Vladimir Divjakovic Monireh Negari Arnold L. Rheingold 《Acta Crystallographica. Section C, Structural Chemistry》2011,67(5):m160-m164
In the new tin(IV) and copper(II) complexes, cis‐dichlorido‐trans‐dimethyl‐cis‐bis(N,N′,N′′‐tricyclohexylphosphoric triamide‐κO)tin(IV), [Sn(CH3)2Cl2(C18H36N3OP)2], (I), and trans‐diaquabis(N,N′,N′′‐tricyclohexylphosphoric triamide‐κO)copper(II) dinitrate–N,N′,N′′‐tricyclohexylphosphoric triamide (1/2), [Cu(C18H36N3OP)2(H2O)2](NO3)2·2C18H36N3OP, (II), the N,N′,N′′‐tricyclohexylphosphoric triamide (PTA) ligands exist as hydrogen‐bonded dimers via P=O...H—N interactions around the metal center. The asymmetric unit in (I) consists of one complete complex molecule located on a general position. The SnIV coordination geometry is octahedral with two cis hydrogen‐bonded PTA ligands, two cis chloride ligands and two trans methyl groups. The asymmetric unit in (II) contains one half of a [Cu(PTA)2(H2O)2]2+ dication on a special position (site symmetry for the Cu atom), one nitrate anion and one free PTA molecule, both on general positions. The complex adopts a square‐planar trans‐[CuO2O2] coordination geometry, with the CuII ion coordinated by two PTA ligands and two water molecules. Each of the noncoordinated PTA molecules is hydrogen bonded to a neighboring coordinated PTA molecule and an adjacent water molecule; the phosphoryl O atom acts as a double‐H‐atom acceptor. The P atoms in the PTA ligands of both complexes and in the noncoordinated hydrogen‐bonded molecules in (II) adopt a slightly distorted tetrahedral environment. 相似文献
14.
The title organic–inorganic hybrid compound, [Co(C10H8N2O2)2(H2O)2]2[Mo8O26]·2H2O, consists of [Co(bpdo)2(H2O)2]2+ (bpdo is 2,2‐bipyridine N,N′‐dioxide) and ξ‐[Mo8O26]4− groups in a 2:1 ratio, plus two water solvent molecules. The independent Co atom in the cation is coordinated by four O atoms from two bpdo ligands and two water molecules, in a distorted octahedral geometry. The counter‐anions, built up around a symmetry center, are linked by solvent water molecules through O—H...O hydrogen bonds to generate two‐dimensional layers, which are in turn linked by coordinated water molecules from the cationic units through further O—H...O hydrogen bonds, forming a three‐dimensional supramolecular structure. 相似文献
15.
David Martínez Majid Motevalli Michael Watkinson 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(4):m258-m260
The title compound, aquachloro{2,2′‐[1,2‐ethanediylbis(nitrilomethylidyne)]diphenolato‐κ4O,N,N′,O′}manganese(III),[MnCl(C16H14N2O2)(H2O)], is a neutral manganese(III) complex with a pseudo‐octahedral metal centre. The equatorial plane comprises the four donor atoms of the tetradentate Schiff base ligand [Mn—O 1.886 (4) and 1.893 (4) Å, and Mn—N 1.978 (5) and 1.982 (5) Å], with a water molecule [Mn—O 2.383 (4) Å] and a Cl? ligand [Mn—Cl 2.4680 (16) Å] completing the coordination sphere. The distorted geometry is highlighted by the marked displacement of the MnIII ion out of the least‐squares plane of the four Schiff base donor atoms by 0.165 (2) Å. These monomeric MnIII centres are then linked into a polymeric array via hydrogen bonds between the coordinated water molecule and the phenolic O‐atom donors of an adjacent MnIII centre [O—H?O 2.789 (5) and 2.881 (5) Å]. 相似文献
16.
Jaromír Marek Zdenk Trvní
ek Pavel Kopel 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(11):m429-m431
The title compound, [Mn(C12H8N2)2(H2O)2](C4H4O4S)·[Mn(C4H4O4S)(C12H8N2)2]·13H2O, contains one dianion of thiodiglycolic acid (tdga2−) and two independent manganese(II) moieties, viz. [Mn(phen)2(H2O)2]2+ and [Mn(tdga)(phen)2], where phen is 1,10‐phenanthroline. The MnII atoms are octahedrally coordinated by four N atoms of two bidentate phen ligands [Mn—N = 2.240 (2)–2.3222 (19) Å] and either two water O atoms or two tdga carboxyl O atoms [Mn—O = 2.1214 (17)–2.1512 (17) Å]. The tdga ligand chelates as an O,O′‐bidentate ligand, forming an eight‐membered ring with one Mn atom. The free tdga2− dianion is hydrogen bonded to an [Mn(phen)2(H2O)2]2+ ion, with O⋯O distances of 2.606 (2) and 2.649 (2) Å. The crystal structure is further stabilized by an extensive network of hydrogen bonds involving 13 water molecules. 相似文献
17.
A novel dinuclear bismuth(III) coordination compound, [Bi2(C7H3NO4)2(N3)2(C12H8N2)2]·4H2O, has been synthesized by an ionothermal method and characterized by elemental analysis, energy‐dispersive X‐ray spectroscopy, IR, X‐ray photoelectron spectroscopy and single‐crystal X‐ray diffraction. The molecular structure consists of one centrosymmetric dinuclear neutral fragment and four water molecules. Within the dinuclear fragment, each BiIII centre is seven‐coordinated by three O atoms and four N atoms. The coordination geometry of each BiIII atom is distorted pentagonal–bipyramidal (BiO3N4), with one azide N atom and one bridging carboxylate O atom located in axial positions. The carboxylate O atoms and water molecules are assembled via O—H...O hydrogen bonds, resulting in the formation of a three‐dimensional supramolecular structure. Two types of π–π stacking interactions are found, with centroid‐to‐centroid distances of 3.461 (4) and 3.641 (4) Å. 相似文献
18.
Ligia R. Gomes John Nicolson Low Ana S. M. C. Rodrigues James L. Wardell Camillo H. da Silva Lima Marcus V. N. de Souza 《Acta Crystallographica. Section C, Structural Chemistry》2013,69(5):549-555
The compounds N′‐benzylidene‐N‐methylpyrazine‐2‐carbohydrazide, C13H12N4O, (IIa), N′‐(2‐methoxybenzylidene)‐N‐methylpyrazine‐2‐carbohydrazide, C14H14N4O2, (IIb), N′‐(4‐cyanobenzylidene)‐N‐methylpyrazine‐2‐carbohydrazide dihydrate, C14H11N5O·2H2O, (IIc), N‐methyl‐N′‐(2‐nitrobenzylidene)pyrazine‐2‐carbohydrazide, C13H11N5O3, (IId), and N‐methyl‐N′‐(4‐nitrobenzylidene)pyrazine‐2‐carbohydrazide, C13H11N5O3, (IIe), have dihedral angles between the pyrazine rings and the benzene rings in the range 55–78°. These methylated pyrazine‐2‐carbohydrazides have supramolecular structures which are formed by weak C—H...O/N hydrogen bonds, with the exception of (IIc) which is hydrated. There are π–π stacking interactions in all five compounds. Three of these structures are compared with their nonmethylated counterparts, which have dihedral angles between the pyrazine rings and the benzene rings in the range 0–6°. 相似文献
19.
Bao‐Zhong Zhao Xiang‐Rong Hao Zhan‐Gang Han Qiang Fu Ya‐Guang Chen 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(1):m48-m50
A novel copper(II) coordination polymer, poly[[[aquacopper(II)]‐μ3‐2,2′‐bipyridyl‐3,3′‐dicarboxylato‐κ4N,N′:O:O′] dihydrate], {[Cu(C12H6N2O4)(H2O)]·2H2O}n, was obtained by the reaction of CuCl2·2H2O and 2,2′‐bipyridyl‐3,3′‐dicarboxylic acid (H2L) in water. In the molecule, each CuII atom is five‐coordinated and lies at the centre of a square‐pyramidal basal plane, bridged by three L ligands to form a two‐dimensional (4,4)‐network. Each L moiety acts as a bridging tetradentate ligand, coordinating to three CuII atoms through its two aromatic N atoms and two O atoms of the two carboxyl groups. The two‐dimensional square‐grid sheets superimpose in an off‐set fashion through the inorganic water layer. 相似文献
20.
Laijin Tian Xiaofeng Zheng Xiaoliang Zheng Yuxi Sun Dongmei Yan Linglan Tu 《应用有机金属化学》2011,25(11):785-790
Two new dinuclear phenyltin(IV) complexes derived from N,N′‐bis(2‐hydroxybenzyl)‐1,2‐ethanebis(dithiocarbamate) ligand, [2‐HOC6H4CH2N(CS2SnPh3)CH2]2 ( 1 ) and [2‐HOC6H4CH2N(CS2SnClPh2)CH2]2 ( 2 ) have been synthesized and characterized by elemental analysis, IR and NMR (1H, 13C and 119Sn) spectra. The crystal structures of complexes 1 and 2 were determined by X‐ray single crystal diffraction and show that the dithiocarbamate ligand is coordinated to the tin atom in the anisobidentate manner and the tin atom is five‐coordinated. The coordination geometry of tin atom is best described as an intermediate between trigonal bipyramidal and square pyramidal with τ‐values of 0.63 and 0.53, respectively. Intermolecular hydrogen bonds (O H···S and O H···Cl) in 1 and 2 connect neighboring molecules into a one‐dimensional supramolecular chain with the centrosymmetric cyclic motifs. Complex 1 has potent in vitro cytotoxic activity against two human tumor cell lines, CoLo205 and Bcap37, while complex 2 displays weak cytotoxic activity. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献