共查询到20条相似文献,搜索用时 21 毫秒
1.
S. F. Solodovnikov S. S. Yarovoi Yu. V. Mironov A. V. Vironets V. E. Fedorov 《Journal of Structural Chemistry》2004,45(5):865-873
New cluster compounds — rhenium and potassium thiohalides K3Re6S7Br7 (I) and K4Re6S8Cl6 (II) — have been synthesized. Their crystal structures have been determined by single crystal X-ray diffraction. The compounds are monoclinic; (I): space group P21/c, a = 9.32(1) Å, b = 13.528 Å, c = 12.413 Å, β = 110.21°, Z = 2, R = 0.038; (II): space group C2/m, a = 10.614 Å, b = 17.268 Å, c = 10.448 Å, β = 110.755°, Z = 2, R = 0.042. In both structures, the potassium ions are considerably distorted. The occupancies of the potassium sites are 0.17-0.34 (I) and 0. 01-0.26 (II), correlating well with the coordination numbers (c.n. 7-10 and 2-7 for I and II, respectively). In I, adjacent positions of potassium atoms are aggregated into discrete tetrahedral and angular clusters; in II, the individual (four-and six-membered) cyclic clusters of potassium sites are present along with bent chains of vertex-and edge-sharing tetrahedral “potassium clusters.” The shortest K-K distances in these “clusters” vary from 1.31 Å to 1.54 Å (I) and from 0.66 Å to 1.65 Å (II). The “instability” of the potassium site suggests that I and II are ion conductors.Original Russian Text Copyright © 2004 by S. F. Solodovnikov, S. S. Yarovoi, Yu. V. Mironov, A. V. Virovets, and V. E. Fedorov__________Translated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 5, pp. 909–917, September–October, 2004. 相似文献
2.
N. B. Smirnov E. I. Burmakin B. D. Antonov G. Sh. Shekhtman 《Russian Journal of Electrochemistry》2000,36(7):736-740
Samples of systems (Na
1-x
K
x
)3.8M0.1P2O7 (M = Ca, Sr, Cd; 0 ≤x ≤ 1) are synthesized. It is established that solid solutions with the structure of γ-K4P2O7 form in these systems. At room temperature, the solutions exist atx ≥ 0.7. In the calcium-containing system, they form a continuous series at temperatures exceeding ∼500°C. The co-cation character
of conduction of the solutions is confirmed by measured transport numbers. The concentration dependences of the electroconductivity
and its activation energy point to a polyalkali effect, which decreases with an increase in the M2+ ion radius. Partial conductivities of sodium and potassium cations in the (Na
1-x
K
x
)3.8Ca0.1P2O7 system are calculated and their dependences on the balance between alkali cations in the solid solution are discussed 相似文献
3.
Lubomír Havlk Jan Fbry Margarida Henriques Michal Duek 《Acta Crystallographica. Section C, Structural Chemistry》2015,71(7):623-630
The title structures of KScS2 (potassium scandium sulfide), RbScS2 (rubidium scandium sulfide) and KLnS2 [Ln = Nd (potassium neodymium sufide), Sm (potassium samarium sulfide), Tb (potassium terbium sulfide), Dy (potassium dysprosium sulfide), Ho (potassium holmium sulfide), Er (potassium erbium sulfide), Tm (potassium thulium sulfide) and Yb (potassium ytterbium sulfide)] are either newly determined (KScS2, RbScS2 and KTbS2) or redetermined. All of them belong to the α‐NaFeO2 structure type in agreement with the ratio of the ionic radii r3+/r+. KScS2, the member of this structural family with the smallest trivalent cation, is an extreme representative of these structures with rare earth trivalent cations. The title structures are compared with isostructural alkali rare earth sulfides in plots showing the dependence of several relevant parameters on the trivalent cation crystal radius; the parameters thus compared are c, a and c/a, the thicknesses of the S—S layers which contain the respective constituent cations, the sulfur fractional coordinates z(S2−) and the bond‐valence sums. 相似文献
4.
5.
《Journal of Coordination Chemistry》2012,65(4):649-659
Four new μ2-oxo-bridged dinuclear aryltelluronic triorganotin esters [ArTe(μ-O)(OH)(OSnR3)2]2 (Ar?=?n-propyl-Ph, R?=?Me: 1, R?=?Ph: 2; Ar?=?i-propyl-Ph, R?=?Me: 3, R?=?Ph: 4) were synthesized by reaction of μ2-oxo-bridged dinuclear aryltelluronic acids and the corresponding R3SnCl (R?=?Me, Ph) with potassium hydroxide in methanol. The complexes were characterized by X-ray crystallography, elemental analysis, FT-IR, and NMR (1H, 13C, 119Sn) spectroscopy. The structural analysis indicates that these complexes are isostructural and crystallized as Sn4Te2 molecules, in which the asymmetric four-membered Te2(μ2-O)2 units are situated in the center. The geometry of tellurium is described as a distorted octahedron and each tin is described as a distorted tetrahedron. Complex 2 has a 2-D network structure connected by intermolecular C–H?π interactions. Complexes 1–4 were tested for in vitro cytotoxicity against human lung cancer cells (A549) and human hepatocellular carcinoma cells (HepG2). 相似文献
6.
《Journal of Coordination Chemistry》2012,65(14):2324-2336
Three coordination compounds [K(H2TDA)H2O] n (1), [K(H2TDA)(H3TDA)2H2O] n (2), and Mn2(phen)2(HTDA)2(H2O)4 (3) have been synthesized and characterized structurally by X-ray diffraction, where H3TDA = 1,2,3-triazole-4,5-dicarboxylic acid and phen = 1,10-phenanthroline. Their solid-state structures have been characterized by elemental analysis and IR spectroscopy. In 1, a 3-D (4, 8)-connected metal-organic framework has been constructed using dinuclear potassium clusters as eight-connected nodes and the ligands as four-connected nodes; it represents the fluorite topology network. Compound 2 exhibits 1-D chains along c-axis, which are connected by strong hydrogen-bond interactions in 2-D layers; the layers are further stacked via hydrogen bonds in the b-direction. In 3, two neighboring Mn(II) ions are bridged by two 1,2,3-triazole-4,5-dicarboxylic groups, forming a binuclear structure, with Mn(II) ··· Mn(II) distance of 4.356 Å, which is further linked to generate a 2-D layer structure via interdimer hydrogen bonds. The fluorescence for these compounds was investigated. 相似文献
7.
I. A. Charushnikova A. M. Fedoseev N. A. Budantseva I. N. Polyakova Ph. Moisy 《Russian Journal of Coordination Chemistry》2007,33(1):61-67
Uranyl complexes with acetylenedicarboxylic acid, K(H5O2)[UO2L2H2O] · 2H2O (I) and Cs2[UO2L2H2O] · 2H2O (II), L2− = C4O
4
2−
were prepared for the first time. The composition and structure of the complexes were determined by X-ray diffraction. The
crystal data are as follows: a = 16.254(12) ?, b = 13.508(8) ?, c = 7.683(6) ?, β = 90.91(7)°, space group C2/c, V = 1687(2) ?3 (I); a = 7.0745(10), b = 18.4246(10), c = 13.1383(10) ?, space group Abm2, V = 1712.5(3) ?3 (II). The structures of I and II are based on [UO2L2H2O]
n
2−
anionic chains stretched along the [101] direction (I) or [010] direction (II). In I and II, the uranium coordination polyhedron is a pentagonal bipyramid in which the equatorial environment of the uranyl ions is
formed by the oxygen atoms of the four L2− anions and the water molecule. The L2− anions in I and II are bidentate bridging ligands connecting two uranium atoms that are next to each other in the anionic chain; their coordination
capacity is equal to 2. In I, the K+ and H5O
2
+
cations are outer-sphere species. The latter form hydrogen bonds combining the anionic chains shifted by translation b with respect to each other. The [UO2L2H2O]
n
2−
chains in I are surrounded by the potassium and oxonium cations; in II, these are combined by hydrogen bonds into anionic layers between which Cs+ cations are arranged. The IR spectrum of compound II was measured and interpreted.
Original Russian Text ? I.A. Charushnikova, A.M. Fedoseev, N.A. Budantseva, I.N. Polyakova, Ph. Moisy, 2007, published in
Koordinatsionnaya Khimiya, 2007, Vol. 33, No. 1, pp. 63–69. 相似文献
8.
Abstract The title 1, 2-anhydro sugar (10) was synthesized from methyl 4, 6-O-benzylidene-α-D-glucopyranoside or from 1, 2-O-ethylidene-α-D-glucopyranose. The key intermediate for the synthesis was 2-O-acetyl-3, 4-di-O-benzyl-6-deoxy-β-D-glucopyranosyl fluoride (8)which was transformed into the target compound by ring closure with potassium tert-butoxide. Calculations by the modified Karplus equation from vicinal coupling constants of 10 suggested that the conformation of 10 was almost an ideal 4 H 5 for the pyranose ring. Conformational analysis for the 1, 2-O-(R)-ethylidene intermediates 17 and 20 revealed that their pyranose ring basically adopted a B2,5 conformation. 相似文献
9.
Lamia Boubakri Khaireddine Dridi Abdullah Sulaiman Al-Ayed İsmail Özdemir Sedat Yasar 《Journal of Coordination Chemistry》2019,72(3):516-527
New palladium complexes were efficiently synthesized from the reaction of benzimidazolium salts 2a–e, potassium carbonate (K2CO3) and palladium chloride (PdCl2) in pyridine (for 3a–e). The catalytic activity of these complexes in a catalytic system including palladium complexes and K2CO3 in DMF-H2O was evaluated in Suzuki–Miyaura cross-coupling reactions of aryl bromides and chlorides with phenylboronic acid. Our novel complexes show excellent catalytic activities with high turnover numbers (TON) and high turnover frequencies (TOF) (e.g. for the Suzuki–Miyaura reaction: TON up to 370 and TOF up to 123.3?h?1). Both benzimidazolium salts 2a–e and complexes 3 have been characterized using spectroscopic data and elemental analysis. The antimicrobial activity of the N-heterocyclic carbene palladium complexes 3a–e varies with the nature of the ligands. Also, the IC50 values of both, complexes (3a–e) and benzimidazoles 2a–e, have been determined. In addition, the new palladium complexes were screened for their antitumor activity. Complexes 3e and 3d exhibited the highest antitumor effect with IC50 values 6.85?μg/mL against MCF-7 and 10.75?μg/mL against T47D, respectively. 相似文献
10.
Ahmet Karadağ Ali Aydin Şaban Tekin Hüseyin Akbaş Süreyya Dede 《Journal of Coordination Chemistry》2019,72(5-7):860-878
The synthesis of three bimetallic cyanido complexes with edbea [2,2′-(ethylenedioxy)bis(ethylamine)] ligand is reported. [NiII(μ-edbea)2{Au(μ-CN)2}2]n (1), [{CuII(edbea)}2{Au(μ-CN)2}4]n (2) and [CdII(edbea)2][Au(CN)2]2·H2O (3) were fully characterized by elemental, infrared, XRD (3), ESI-MS and thermal analysis. The DNA/BSA binding properties of these complexes were evaluated by spectrophotometric titration, fluorometric ethidium bromide kinetics, and DNA electrophoresis studies and their partially minor groove binding mode between the base pairs of DNA and electrostatic interaction between the amino acid residues of BSA were explained. The complexes were tested for their pharmacological properties. These molecules had excellent in vitro antiproliferative activity and also exhibited a strong tumor inhibiting effect against HT29, HeLa, C6 and Vero cell lines. These complexes had metastatic features as they are able to reduce cell migration activity and suppress tumor growth in vitro. Analysis of the DNA topoisomerase I relaxing activity indicates that the complexes do not inhibit topoisomerase I which regulates the topological states of the DNA double helix during DNA processing reactions. The TUNEL and DNA laddering assay results indicated that these compounds may destroy cell maintenance by triggering apoptosis. Immunohistochemistry staining analysis demonstrated that these complexes significantly decreased the expression of Bcl-2 in HeLa and HT29 cells while increasing the expression of P53 levels. Overall, the potent antiproliferative activity, low cytotoxic effect, good solubility, and micro molar range dosage observed for these complexes emphasizes their potential as anticancer drug candidates. 相似文献
11.
《Journal of Coordination Chemistry》2012,65(9):1091-1096
The combination of iminodiacetic acid (H2ida) with cobalt(II) chloride hexahydrate in the presence of sodium hydroxide, followed by heating, produces the trans-facial isomer of K[Co(ida)2]·2H2O. This compound contains extensive intermolecular and intramolecular coordination and hydrogen bonding involving the potassium ions, and results in a complex three-dimensional structure in which each potassium ion is immediately surrounded by six cobalt centers. 相似文献
12.
D. M. Tsymbarenko E. A. Bukhtoyarova I. E. Korsakov S. I. Troyanov 《Russian Journal of Coordination Chemistry》2011,37(11):825-831
A method for the synthesis of potassium pivalates (trimethylacetates) from potassium tert-butoxide and pivalic acid was proposed. The complexes of the formulas [K(H2O)(Piv)]∞(I) and [K2(Phen)(H2O)2(Piv)2]∞ (II) (Piv denotes the pivalate anion and Phen denotes 1,10-phenanthroline) were obtained and characterized by elemental analysis
and IR and 1H NMR spectroscopy. The crystal structures of complexes I and II were determined using X-ray diffraction. Crystal structure I has a layered motif with two nonequivalent K atoms (C.N.s 5 + 2 and 6). The coordination of phenanthroline in II gives rise to a ribbon motif, the structure containing three nonequivalent K atoms (C.N.s 6, 6 + 1, and 8). 相似文献
13.
《Journal of Coordination Chemistry》2012,65(7):1265-1275
Extended X-ray absorption fine structure (EXAFS) measurements have been recorded at the K-edge of copper in binuclear monohydroxo-bridged copper(II) complexes [(bpy)2Cu–OH–Cu(bpy)2](ClO4)3 (1) and [(phen)2Cu–OH–Cu(phen)2](C1O4)3 (2) and dihydroxo-bridged copper(II) complexes [Cu2(μ–OH)2(bipy)2]SO4?·?5H2O (3) and [Cu2(μ–OH)2(phen)2]SO4?·?5H2O (4) (where bpy and phen are 2,2′-bipyridine and 1,10-phenanthroline, respectively) using the dispersive EXAFS beamline at 2?GeV Indus-2 synchrotron source at RRCAT, Indore, India. The EXAFS data have been analyzed using the software, Athena and Artemis. Theoretical models have been generated for 1 and 3 using available crystallographic data and then fitted to their experimental EXAFS data to obtain the structural parameters, which include bond-lengths, coordination numbers, and thermal disorders. The results obtained have been found to be comparable with their crystallographic results. As the crystallographic data for 2 and 4 are not available in the literature, we have determined their structural parameters by fitting their experimental EXAFS data with the same theoretical models which were generated for their corresponding analogous complexes 1 and 3, respectively. The structural parameters thus determined have been reported. Also, on the basis of the analysis of the EXAFS data, these four complexes have been shown to be binuclear, i.e. they contain two metals. Further, the values of the chemical shifts suggest that copper is in +2 oxidation state in these complexes. 相似文献
14.
Ivanka Matijašić Paolo Dapporto Patrizia Rossi Ljerka Tušek-Božić 《Supramolecular chemistry》2013,25(1):193-206
Abstract Crown ether complexes formed by the dibenzo–30-crown–10 (DB30C10) with potassium and ammonium hexafluorophosphate have been prepared and their crystal structures have been determined by single crystal X-ray analyses. The potassium complex (compound 1) consists of [K(DB30C10)]+ cation and PF6 ? anion. Crystals are monoclinic, space group P2/n, with a = 11.9106(3), b = 9.8382(5), c = 14.3062(3) Å, β = 97.581(3)°, V = 1661.7(1) Å3, Dc = 1.440 g cm?3, Z = 4, R = 0.0675 for 2528 unique observed reflections. The potassium atom is coordinated to the ten oxygen atoms of the crown ligand at the distance from 2.859(3) to 2.930(3) Å. The ammonium complex (compound 2) has also 1:1 crown—cation ratio. Crystals are monoclinic, space group P21/n, with a = 12.5061(6), b = 19.3724(5), c = 14.2203(9) Å, β = 102.476(5)°, V = 3363.8(3) Å3, Dc = 1.501 g cm?3, Z = 4, R = 0.0677 for 4172 unique observed reflections. The ammonium cation is completely enclosed with crown oxygen atoms forming seven hydrogen bonds. The conformation of previously reported dibenzo-30-crown-10 complexes with potassium salts were investigated using polar coordinate maps. 相似文献
15.
《Journal of Coordination Chemistry》2012,65(4):325-333
Abstract The crystal structural investigations of 1 : 1 (La/Nd)KFe(CN)6 4H2O (I) and 1:1 (Pr/Nd) KFe(CN)6·4H2O (II) have been determined using three-dimensional, single-crystal, X-ray diffraction data and refined by least-squares to yield final reliability (R) factors of 0.0180 and 0.020 based on 358 and 343 unique reflections, respectively. I and II crystallize in the hexagonal space group P63/m (No. 176) with a = 7.371(1), c= 13.833(3)Å for I and a = 7.362(1), c= 13.799(3) A for II. For Z = 2, the respective calculated densities are 2.371 and 2.388 mgm?3 [exp., 2.369(4) and 2.382(4)mgm?3]. The coordination about the lanthanide central ions in both I and II is nine, and the geometric polyhedra are tricapped trigonal prisms (TTP). Cyanide bridging links the octahedral FeC6 groups to the nine-coordinated (Ln/Nd)N6(H2O)3 groups. The noncoordinated water molecule and the potassium ion occupy holes in the lattice along the three-fold axis above and below the lanthanide ions. Selected bond distances and angles are presented as well as discussions of the synthesis, TGA, IR, and digital SEM/EDS results, and other peripheral studies of I and II. 相似文献
16.
Damir A. Safin Maria G. Babashkina Michael Bolte Łukasz Szyrwiel Axel Klein Henryk Kozlowski 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):1739-1745
The reaction of the potassium salt of the N-(thio)phosphorylated thioureas AdNHC(S)NHP(O)(OiPr)2 (HLI , Ad = Adamantyl) and MeNHC(S)NHP(S)(OiPr)2 (HLII ) with Co(II) and Zn(II) in aqueous EtOH leads to [MLI,II 2] chelate complexes. They were investigated by UV-vis, 1H and 31P NMR spectroscopy, and microanalysis. The molecular structures of [MLI 2] were elucidated by single crystal X-ray diffraction analysis. The metal centers in both complexes are found to be in a distorted-tetrahedral O2S2 environment formed by the C=S sulfur atoms and the P=O oxygen atoms of two deprotonated LI ligands. The photoluminescence properties of [ZnLII 2] are also reported. 相似文献
17.
Patricio Hermosilla-Ibáñez Juan Costamagna Andrés Vega Verónica Paredes-García Eric Le Fur 《Journal of Coordination Chemistry》2014,67(23-24):3940-3952
In the present work, the synthesis and structural characterization of two new polyoxovanadoborate (BVO) frameworks, based on the [V12B18O60H6]10? polyanion, are reported, K(H3O)(enH2)4[V12B18O60H6]·9.60H2O (1) and Li8(NH4)2[V12B18O60H6]·8.02H2O (2). Both compounds are obtained in a mixed valence ratio of 10VIV/2VV. Framework 1 is characterized by potassium ions coordinated by the BVO cluster and ethylenediammonium and hydronium ions as charge-compensating agents. In framework 2, the BVO clusters are coordinating lithium ions and the charge is compensated by ammonium ions. Using the SHAPE 2.1 program, it was possible to calculate the best geometry for the existing lithium and potassium ions. For 2, the lithium ions are five-coordinate, best described by a square pyramid (SPY-5), while the coordination sphere around the potassium ions in 1 are six-coordinate. For 1, the coordination sphere of the existing potassium ions in the framework can be described as trigonal prism (TPR-6). Calculations were also done for a previously reported cluster [Na10[(H2O)V12B18O60H6]·18H2O] (3), in which the sodium ions are six-coordinate but in two different geometries, these being octahedral and TPR-6. The influence of the interactions of the alkali ions with the [V12B18O60H6]10? polyanion, on the vanadate and borate absorption bands observed in the infrared spectra, is discussed. 相似文献
18.
《Journal of Coordination Chemistry》2012,65(20):3259-3267
A 1-D ladder-like aggregate, K2Na6[Na(H2O)Fe2(H2O)8(P5W30O110)] · 23.5H2O (1; K2Na6[1a] · 23.5H2O) has been obtained by conventional aqueous solution reaction. X-ray diffraction analysis reveals that 1 crystallizes in the monoclinic system, space group P 2 1 /m, a = 16.938(3) Å, b = 21.396(4) Å, c = 17.520(4) Å, β = 98.14(3)°, V = 6285(2) Å3, and Z = 2. Polyoxoanion 1a shows a 1-D ladder-like chain, built up of Preyssler anion and Fe3+ linkers, which represents the first extended structure based on Preyssler anion and transition metal linkers. The 1-D chains in 1 are further connected into a 3-D open framework by potassium and sodium cations. Compound 1 displays electrocatalytic activity towards the reduction of nitrite. 相似文献
19.
Alphia R. Gataulina Damir A. Safin Timur R. Gimadiev Marina V. Pinus 《Transition Metal Chemistry》2008,33(7):921-924
Reaction of the potassium salts of podand-containing bis(dithiophosphonate)s [PhO(4-C6H4)P(S)(SH)OCH2CH2]2O (H
2
L) with Co(II), Ni(II) and Cd(II) in aqueous EtOH leads to complexes of formulae M2(L-S,S′)2. The structural formulae of the compounds were deduced by physico-chemical and spectroscopic methods. It was established
that complex Ni
2
L
2
recognizes CH2Cl2. 相似文献
20.
New diorganotin(IV) complexes [Me2Sn(2-ClC6H4CH2CONHO)2] (1) and [n-Bu2Sn(2-ClC6H4CH2CONHO)2] (2) have been synthesized by reactions of Me2SnCl2 and n-Bu2SnCl2 with potassium 2-chloridophenylacetohydroxamate (2-ClPhAHK = 2-ClC6H4CH2CONHOK) in 1:2 molar ratio in MeOH+C6H6 solvent medium and characterized by elemental analyses, molar conductivity, molecular weight determinations and spectroscopic techniques (IR, 1H, 13C, and 119Sn NMR) and mass spectrometry. Bonding through carbonyl and hydroxamic oxygens (O,O coordination) and distorted-octahedral geometry around tin is proposed. The electrochemical behavior of 1 and 2 studied by cyclic voltammetry shows quasi-reversible reductions. Thermal behavior of 1 and 2 in N2 shows decomposition in one step affording SnO as the residue. The in vitro antimicrobial activity assay against pathogenic Gram-negative bacteria viz. Salmonella typhi, Escherichia coli; Gram-positive Bacillus cereus and Staphylococcus aureus and fungi Aspergillus niger and Alternaria alternata by MIC method revealed their significant antimicrobial potential relative to the respective standard Chloramphenicol and Nystatin drugs. 相似文献