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1.
Qingli Hao Xujie Yang Fangfang Jian Lude Lu Xin Wang Ibrahim Abdul Razak Suchada Chantrapromma Hoong-Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(1):42-44
The two title compounds, [M(C6H14O2PS2)2(C12H8N2)], where M = CdII and FeII, are isomorphous. Each compound has a crystallographic twofold axis of symmetry through the metal atom and the 1,10-phenanthroline molecule. The central metal atom is coordinated to four S atoms from the two dithiophosphate groups and two N atoms from the 1,10-phenanthroline ligand. The environment of the metal atom is a distorted octahedron. 相似文献
2.
R. Alan Howie James L. Wardell 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(9):1041-1043
The structures of the ketotins determined here, [SnCl2(C6H11O)2] and [Sn(C3S5)(C6H11O)2], respectively, along with that previously reported for [MeC(O)CH2CMe2]2SnI2, are compared with the structures of the analogous estertins [MeOC(O)CH2CH2]2SnX2. Pairwise comparison of the mean ketotin [estertin] Sn—X and Sn—O distances as Sn—X 2.4422 (4) [2.4054 (7) Å], 2.4970 (4) [2.471 (2) Å] and 2.8463 (4) [2.7788 (8) Å] and Sn—O 2.4926 (12) [2.528 (1) Å], 2.6110 (11) [2.629 (7) Å] and 2.435 (3) [2.525 (4) Å] (for X = Cl, S and I, respectively) clearly demonstrates the superior donor ability of the ketotin O atom in chelate formation. 相似文献
3.
Stefanus Otto Alfred Johannes Muller 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(12):1405-1407
The crystal structure of cis-[PtCl2(C6H15As)2], (I), is isostructural with a previously reported structure of cis-[PtCl2(C6H15P)2], (II). A new polymorph of (II) is also reported here. Selected geometrical parameters in the arsine complex are Pt—Cl 2.3412 (12) and 2.3498 (13), Pt—As 2.3563 (6) and 2.3630 (6) Å, Cl—Pt—Cl 88.74 (5), As—Pt—As 97.85 (2), and Cl—Pt—As 171.37 (4) and 177.45 (4)°. Corresponding parameters in the phosphine complex are Pt—Cl 2.364 (2) and 2.374 (2), Pt—P 2.264 (2) and 2.262 (2) Å, Cl—Pt—Cl 85.66 (9), P—Pt—P 98.39 (7), and Cl—Pt—P 170.26 (7) and 176.82 (8)°. 相似文献
4.
Erik Heigel Hans Bock Volker Krenzel Mark Sievert 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(2):154-155
The title compound, Na+·C6H5S−·C6H16N2, forms lipophilically wrapped infinite sodium chains along the a axis. Each sodium cation is coordinated by three thiophenolate S atoms and two N centres of one tetramethylethylenediamine molecule. 相似文献
5.
Jan W. Bats Marc A. Grundl A. Stephen K. Hashmi 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(2):208-210
The crystal structure of the title compound, C16H22N2O4, has two independent chiral molecules related by a pseudo-inversion centre. 14 of the 22 non-H atoms have a centrosymmetric counterpart within a tolerance of 0.17 Å. A search of the Cambridge Structural Database [Spring 2000; Allen & Kennard (1993). Chem. Des. Autom. News, 8 , 1, 31–37] shows at least 10% of the crystal structures reported in the literature with space group P21 and Z = 4 to be chiral compounds with a pseudo-P21/c packing. 相似文献
6.
Ya Xiong Mingliang Tong Taicheng An Hans T. Karlsson 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(12):1385-1387
In the neutral title complex, [Cu(C3H2O4)(C5H8N2)2(H2O)]·2H2O or [Cu(mal)(dmp)2(H2O)]·2H2O (mal is malonate and dmp is 3,5-dimethyl-1H-pyrazole), the CuII ion, in a slightly distorted square-pyramidal geometry, is coordinated by two O atoms of the bidentate malonate, the O atom of the water ligand and two N atoms from the two 3,5-dimethylpyrazole ligands. The mean Cu—N bond length is 2.007 (6) Å, longer than the Cu—Omal bonds [1.950 (5) Å]. The apical position is occupied by a relatively strongly coordinated water molecule [Cu—Owater 2.288 (5) Å]. The crystal structure is characterized by the layer motif of a hydrogen-bonded network. 相似文献
7.
Miao Du Xian-He Bu He Liu Xue-Bing Leng 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(2):201-202
The crystal structure of the title compound, C16H8N6, contains two independent molecules with no significant difference in their structures. The pyrazine ring makes dihedral angles of 36.7 (2) and 36.5 (3)° with the two pyridine rings in one molecule, and 43.1 (2) and 38.4 (1)° in the other. The dihedral angles between the two pyridine rings are 58.2 (2) and 56.0 (2)°, respectively. The favoured orientation of the pyridine rings is such that their N atoms face each other. 相似文献
8.
Alan Hazell Puk Lund Annemette Saugbjerg 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(3):257-259
The title compound, aqua[bis(salicylidene)ethylenediaminato-O,N,N′,O′]oxovanadium(V) nitrate, [VO(C16H14N2O2)(H2O)]NO3, crystallizes as two polymorphs in the triclinic and monoclinic crystal systems. In both, the V atom has a distorted octahedral coordination geometry with a long V—Owater bond trans to V=O. The coordinated water molecules are hydrogen bonded to the nitrate ions so that pairs of cations are linked to give neutral centrosymmetric dimers. The V=O and V—Owater distances are 1.598 (2) and 2.257 (2) Å, respectively, in the triclinic form, and 1.588 (3) and 2.230 (3) Å, respectively, in the monoclinic form. In the triclinic form, the dimers pack so that the salen [bis(salicylidene)ethylenediaminate] ligands are parallel to each other, whereas in the monoclinic form, which is the denser, there is a herring-bone arrangement. 相似文献
9.
Geraldo L. Crossetti Carlos A. L. Filgueiras R. Alan Howie James L. Wardell Claudio M. Ziglio 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(11):1279-1281
In the title compound, [NiBr2(C31H32NP)], (I), the second reported example of a nickel–iminophosphine N,P-chelate in which the Ni atom has tetrahedral coordination, the Ni coordination is distorted as a consequence of the N—Ni—P chelate bite angle of 91.07 (6)° compensated by the Br—Ni—Br angle of 126.385 (18)°. In (I) and its analogue, viz. dichloro{[2-(4-isobutyloxazol-2-yl)phenyl]diphenylphosphine-N,P}nickel(II), the Ni—N and Ni—P distances are greater and the N—Ni—P ligand bite angles smaller than those observed in a series of related complexes with square-planar nickel. 相似文献
10.
Rangachari Vijayaraghavan Pravindra Kumar Sharmistha Dey Tej P. Singh 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(10):1220-1221
The structure of the title peptide, C25H27N3O5, has been determined and its conformation analysed. Values of the standard peptide torsion angles are ϕ1 = −44.2 (3)°, ψ1 = 135.9 (2)°, ϕ2 = −141.6 (2)° and ψ2T = 168.0 (2)°. The crystal structure is stabilized by an intermolecular hydrogen bond, with an N⃛O distance of 2.919 (3) Å, which is formed between screw-axis-related NH and CO groups of dehydrovaline residues. 相似文献
11.
Dorothy H. Gibson Mark S. Mashuta Haiyang He 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(10):1135-1137
The two title compounds, [Re(C10H10N6)(CO)3]Br and [Re(C11H12N6)(CO)3]I·0.5C2H6O, have slightly distorted octahedral geometries about the rhenium centers. The distortions result from the constraints of the η3-coordinated tris(pyrazol-1-yl)methane ligands in each case which reduce the N—Re—N bond angles well below the preferred value of 90° for facially disposed ligands at a six-coordinate metal center. 相似文献
12.
Alexander J. Blake Vito Lippolis Simon Parsons Martin Schröder 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(1):36-37
In the title complex, [CuCl2(C12H24S6)]n, the CuCl2 unit and the ligand lie on and about inversion centres, respectively. The coordination geometry at CuII is a tetragonally elongated octahedron with the equatorial positions occupied by two chlorides, Cu—Cl 2.2786 (12) Å, and two S donors, Cu—S 2.3710 (13) Å. The apical positions of the octahedron are defined by two S donors at distances of 2.8261 (14) Å from the metal. The macrocyclic ligand adopts a very puckered and distorted conformation. Eight of the 18 torsion angles are less than 90° and all S-donors are oriented exo to the ring. 相似文献
13.
Dianne D. Ellis Anthony L. Spek 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(2):147-148
The title complex, [V(C7H7N)(C13H23N2Si2)2Cl], consists of a V metal centre coordinated to five N atoms and a Cl− ion in a pseudo-octahedral arrangement. The N atoms of the benzamidinate ligands form two four-membered chelate rings to V, with bite angles of 63.59 (8) and 64.36 (8)°, whilst the fifth N atom is from a p-tolylimido ligand [V—N—C 172.2 (2)°] located cis with respect to the Cl− ion [Cl—V—Nimido 96.96 (8)°]. 相似文献
14.
Takafumi Yoshida Takayoshi Suzuki Sumio Kaizaki 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(11):1274-1276
The complex cation in [4,5-dihydro-4,4,5,5-tetramethyl-2-(2-pyridyl-κN)imidazol-1-oxyl 3-oxide-κO3](nitrato-κ2O,O′)(N,N,N′,N′-tetramethyl-1,2-ethanediamine-κ2N,N′)nickel(II) hexafluorophosphate dichloromethane solvate, [Ni(NO3)(C6H16N2)(C12H16N3O2)]PF6·CH2Cl2, is the first example of a nitronyl nitroxide complex of a transition metal ion having d electrons in which nitrate is coordinated as a bidentate ligand. Owing to the smaller steric requirement of NO3−, the Ni—O(nitroxide) bond length [2.014 (2) Å] is remarkably shorter than that in the corresponding β-diketonate complexes [2.052 (4)–2.056 (2) Å]. 相似文献
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16.
Tian-Huey Lu Yung-Jan Lin Hung Luh Fen-Ling Liao Chung-Sun Chung 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(12):1398-1399
The crystal structure of the title complex, tetrakis[μ-6-amino-3-methyl-4-azahex-3-en-2-one oximato(1–)-κ4N,N′,N′′:O]tetracopper(II) tetraperchlorate 0.6-hydrate, [Cu4(C6H12N3O)4](ClO4)4·0.6H2O, shows the cation to be an oximate-bridged tetramer composed of four 6-amino-3-methyl-4-azahex-3-en-2-one oxime ligands and four copper(II) ions and to have crystallographically imposed symmetry. Each CuII atom is four-coordinated by the three N atoms of one oxime ligand and by the O atom of another oxime ligand in a distorted square-planar geometry. 相似文献
17.
Pierre Thuéry Martine Nierlich Jacques Vicens Bernardo Masci 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(1):70-71
The title compound, 7,13,21,27-tetra-tert-butyl-3,17-dioxapentacyclo[23.3.1.15,9.111,15.19,23]ditriaconta-1(29),5,7,9(30),11(31),12,14,19(32),20,22,25,27-dodecaene-29,30,31,32-tetraol, crystallizes as a solvate with one molecule of chloroform and one molecule of tetrahydrofuran, C46H60O6·CHCl3·C4H8O. The calixarene assumes a cone-like conformation stabilized by intramolecular hydrogen bonds involving both phenolic and ether O atoms. The two solvent molecules are located in each of the two half-cone cavities of the calixarene. 相似文献
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19.
Machala Viktor Trávníček Zdeněk Šindelář Zdeněk Kvítek Libor Marek Jaromír 《Transition Metal Chemistry》2000,25(6):715-719
A series of NiII complexes with the O,O-di-isoamylester of dithiophosphoric acid and nitrogen-donor ligands of composition [Ni(i-Am2dtp)2(L)]; [dtp = O2PS2
–; L = 2,2-bipyridine (bpy); 1,10-phenanthroline (phen); 5-nitro-1,10-phenanthroline (nphen); 4,7-diphenyl-1,10-phenanthroline (baphen); 2,9-dimethyl-1,10-phenanthroline (neo), 2-aminomethylpyridine (amp), 2-(2-aminoethyl)pyridine (aep), 2,2-dipiridylamine (dpa), 1,2-diaminopropane (1,2-dap) or trans 1,2-diaminocyclohexane (dch)] have been prepared. The compounds have been characterized by elemental analyses (C,H,N,S), electronic and i.r. spectroscopy, magnetic and conductivity measurements and by cyclic voltammetry. The results show that all complexes behave as non-electrolytes in acetone. Electronic spectra and magnetic moments suggest a distorted cis-octahedral geometry around the NiII atom [eff/B <3.10, 3.40 >], except for [Ni(i-Am2dtp)2(aep)], where the measured temperature dependence of the magnetic susceptibility proved the tetrahedrally coordinated nickel [4.06 eff/B (298 K) – 3.20 eff/B (80 K)]. In the [Ni(i-Am2dtp)2(neo)] complex, the nickel atom is penta-coordinated. The X-ray crystal and molecular structure of [Ni(i-Am2dtp)2(1,2-dap)] has been determined. 相似文献
20.
Jan Fábry Jan Kroupa Ivana Císařová 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(1):22-25
-Hexylammonium dihydrogenarsenate, (C6H16N)[AsO2(OH)2], and -octylammonium dihydrogenarsenate, (C8H20N)[AsO2(OH)2], are both ferroelastic at room temperature. The samples used in this study were not subjected to a phase transition after they had been crystallized. The structures are monoclinic (P21/n) and isostructural with the corresponding dihydrogenphosphates. Each sample contained two domains and each structure was refined as a twin. There are strong hydrogen bonds between dihydrogenarsenates and moderate hydrogen bonds between dihydrogenarsenates and -alkylammonium groups. The hydrogen-bond distances correspond well to those observed in the dihydrogenphosphates. All the atoms except two H atoms exist in pairs linked by the lost symmetry operations derived from the prototypic space group P2/b21/n21/a. Each of these two different H atoms is involved in an asymmetric hydrogen bond between an oxygen pair. These oxygens are supposed to change their roles as hydrogen-bond donors and acceptors during the ferroelastic switching. The phase-transition sequences are affected by interactions between the neighbouring organic chains in the structure. 相似文献