共查询到20条相似文献,搜索用时 8 毫秒
1.
M. Yu. Shilova A. V. Vologzhanina L. B. Serezhkina V. N. Serezhkin 《Russian Journal of Inorganic Chemistry》2009,54(11):1763-1767
Single crystals of Li(H3O)[UO2(C2O4)2(H2O)] · H2O (I) have been synthesized and studied by X-ray diffraction. Compound I crystallizes in the monoclinic crystal system with the unit cell parameters: a = 7.1682(10) Å, b = 29.639(6) Å, c = 6.6770(12) Å, β= 112.3(7)°, space group P 21/c, Z = 4, R = 4.36%. Structure I contains discrete mononuclear groups [UO2(C2O4)2(H2O)]2? ascribed to the crystal-chemical group AB 2 01 M1 (A = UO2 2+, B01 =C2O 4 2? , M1 = H2O), which are “cross-linked” by the lithium ions into infinite layers {Li(UO2)(C2O4)2(H2O)2}? perpendicular to [010]. The hydroxonium ions are located between adjacent uranium-containing layers. A hydrogen bond system involving water molecules, oxalate ions, and hydroxonium combines the anionic layers into a three-dimensional framework. 相似文献
2.
L. B. Serezhkina E. V. Peresypkina A. V. Virovets I. V. Medrish D. V. Pushkin 《Russian Journal of Inorganic Chemistry》2009,54(10):1577-1580
Single crystals of Cs[(UO2)2(C2O4)2(OH)] · H2O were synthesized and structurally studied using X-ray diffraction. The compound crystallizes in monoclinic space group P21/m, Z = 2, with the unit cell parameters a = 5.5032(4) Å, b = 13.5577(8) Å, c = 9.5859(8) Å, β = 97.012(3)°, V = 709.86(9) Å3, R = 0.0444. The main building units of crystals are [(UO2)2(C2O4)2(OH)]? layers of the A2K 2 02 M2 (A = UO 2 2+ , K02 = C2O 4 2? , and M2 = OH?) crystal-chemical family. Uranium-containing layers are linked into a three-dimensional framework via electrostatic interactions with outer-sphere cations and hydrogen bonds with water molecules. 相似文献
3.
N. G. Chernorukov O. V. Nipruk A. V. Knyazev Yu. P. Pykhova 《Russian Journal of Inorganic Chemistry》2011,56(2):163-167
A method for producing synthetic troegerite of composition(UO2)3(AsO4)2 · 12H2. Owas developed. X-ray diffraction, IR spectrometry, X-ray fluorescence analysis, and scanning calorimetry were used to study
its dehydration and thermal decomposition, to solve the structgure, and to determine X-ray diffraction and IR spectroscopic
characteristics. 相似文献
4.
I. V. Medrish E. V. Peresypkina A. V. Virovets L. B. Serezhkina 《Russian Journal of Coordination Chemistry》2008,34(8):629-634
The single crystals of Rb2[(UO2)2(C2O4)2(SeO4)] · 1.33H2O were synthesized and studied by X-ray diffraction. The crystals are monoclinic, space group P21/m, Z= 2, the unit cell parameters: a = 5.6537(8), b = 18.736(3), c = 9.4535(15) Å, β = 98.440(5)°, V = 990.6(3) Å3, R 1 = 0.0506. The main structural units of the crystal are infinite layers of [(UO2)2(C2O4)2(SeO4)]2?, corresponding to the crystal chemical group A2K 2 02 B2 (A = UO 2 2+ , K02 = C2O 4 2? , B2 = SeO 4 2? ) of uranyl complexes. The uranium-containing layers are united into a three-dimensional framework through the electrostatic interactions with the outer-sphere rubidium ions and the hydrogen bonding system involving the outer-sphere water molecules. 相似文献
5.
A. A. Kashaev I. V. Rozhdestvenskaya I. I. Bannova A. N. Sapozhnikov O. D. Glebova 《Journal of Structural Chemistry》2008,49(4):708-711
Four structural models of volborthite Cu3(OH)2(V2O7)·2H2O (a = 10.646(2) Å, b = 5.867(1) Å, c = 14.432(2) Å, β = 95.19(1)°, V = 897.7(5) Å3, Z = 4, R/R w = 0.038/0.046) calculated in the space groups determined from the systematic absences are compared. Based on the structure balance and the similarity of constituting polyhedra, values of the R factor, and isotropic thermal parameters, the space group Ia is found to be preferable, which is the only possible asymmetric and uniform variant. Hydrogen atoms of OH-groups, oxygen atoms and, partially, hydrogen atoms of water are localized. 相似文献
6.
Zh. V. Akhmerkina E. V. Peresypkina A. V. Virovets L. B. Serezhkina 《Russian Journal of Inorganic Chemistry》2008,53(9):1396-1400
Single crystals of Ba3[UO2(C2O4)2(NCS)]2 · 9H2O are synthesized and studied by X-ray diffraction. The crystals are orthorhombic, space group Fddd, Z = 16, and the unit cell parameters are a = 16.253(3) Å, b = 22.245(3) Å, c = 39.031(6) Å. The main crystal structural units are mononuclear complex groups [UO2(C2O4)2NCS]3? of the crystal-chemical family (AB 2 01 M1 (A = UO 2 2+ , B01 = C2O 4 2? , M1 = NCS?) of the uranyl complexes linked into a three-dimensional framework by electrostatic interactions and hydrogen bonds involving oxalate ions and water molecules. 相似文献
7.
Ray L. Frost Sara J. Palmer Ross E. Pogson 《Journal of Thermal Analysis and Calorimetry》2012,107(3):905-909
Thermogravimetry combined with evolved gas mass spectrometry has been used to characterise the mineral crandallite CaAl3(PO4)2(OH)5·(H2O) and to ascertain the thermal stability of this ‘cave’ mineral. X-ray diffraction proves the presence of the mineral and
identifies the products of the thermal decomposition. The mineral crandallite is formed through the reaction of calcite with
bat guano. Thermal analysis shows that the mineral starts to decompose through dehydration at low temperatures at around 139 °C
and the dehydroxylation occurs over the temperature range 200–700 °C with loss of the OH units. The critical temperature for
OH loss is around 416 °C and above this temperature the mineral structure is altered. Some minor loss of carbonate impurity
occurs at 788 °C. This study shows the mineral is unstable above 139 °C. This temperature is well above the temperature in
the caves of 15 °C maximum. A chemical reaction for the synthesis of crandallite is offered and the mechanism for the thermal
decomposition is given. 相似文献
8.
A. V. Oreshkina G. Z. Kaziev N. N. Lobanov A. V. Steblevskii 《Russian Journal of Inorganic Chemistry》2012,57(3):327-330
The magnesium heteropoly compound (NH4)4[MgMo6O18(OH)6] · 5H2O (I) has been synthesized and studied by mass spectrometry, IR spectroscopy, X-ray powder diffraction, and thermogravimetry. Crystals of I are monoclinic, space group P21/n, a = 15.10 Å, b = 11.64 Å, c = 13.53 Å, β = 74.28°, V = 2289.31 Å3, ρcalc = 1.09 g/cm3, Z = 1. 相似文献
9.
Procedures for the synthesis of the [RuNO(NH3
3(NO2)(OH)]Cl·0.5H2O complex have been developed. The compound was investigated by IR spectroscopy, and also by powder and single crystal X-ray diffraction. Crystal data for H11CIN5O4.5Ru: a = 6.5752(7) Å, b = 11.0900(18) Å, c = 12.296(2) Å, ά = 79.692(13)°, β = 85.088(11)°, γ = 87.395(11)°, V = 878.5(2) Å3, Z = 4, d
calc = 2.190 g/cm3, space group
. The structure is formed by [RuNO(NH3)3(NO2)(OH)]+] complex cations, Cl− anions, and crystallization water molecules. The complex crystallizes as yellow transparent prisms belonging to the triclinic crystal system; it is soluble in water and insoluble in ethanol and acetone. The crystals are stable when kept in a closed beaker, but gradually degrade in dry air.Original Russian Text Copyright © 2004 by V. A. Emel’yanov, S. A. Gromilov, and I. A. Baidina__________Translated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 5, pp. 923–932, September–October, 2004. 相似文献
10.
The crystal structure of the coordination compound Na[RuNOCl3(H2O)OH]·2H2O is reported. The complex is studied by IR and NMR spectroscopy, powder and single crystal X-ray diffraction. Crystallographic data determined for H7Cl3NNaO5Ru is: a = 6.648(2) ?, b = 8.216(7) ?, c = 10.063(3)?, α= 89.75(6)°, β = 70.96(2)°, γ = 78.76(5)°, V = 967.9(2) ?3, P1 space group, Z = 4, d x = 2.165 g/cm3. 相似文献
11.
G. B. Andreev M. Yu. Antipin N. A. Budantseva N. N. Krot 《Russian Journal of Coordination Chemistry》2005,31(11):800-803
A new neptunium(V) complex [(NpO2)2(CH3COO)2(H2O)] ? 2H2O was synthesized and its crystal structure was determined. The unit cell parameters are: a = 24.007(10) Å, b = 6.779(3) Å, c = 8.076(3) Å, space group Pnma, Z = 4, V = 1314.2(9) Å3, R = 0.049, wR(F2) = 0.105. The crystal structure of the compound is composed of neutral [(NpO2)2(CH3COO)2(H2O)] layers and molecules of the water of crystallization. Each of the crystallographically independent neptunoyl ions performs a bidentate function thus forming a composite system of cation-cation bonds. 相似文献
12.
I. V. Medrish E. V. Peresypkina A. V. Virovets L. B. Serezhkina 《Russian Journal of Inorganic Chemistry》2008,53(7):1040-1045
Single crystals of M[UO2(C2O4)(NCS)] · 0.5H2O (M = Rb (I) or Cs (II)) have been synthesized and studied by X-ray diffraction analysis. The compounds are isostructural, and their crystals are monoclinic with the space group C2/c, Z = 4, and unit cell parameters: a = 9.0624(5) Å, b = 13.1242(7) Å, c = 8.9204(5) Å, β = 98.897(2)°, R = 0.0226 (I); a = 9.3171(3) Å, b = 13.2987(5) Å, c = 9.1151(3) Å, β = 101.0860(10)°, R = 0.0214 (II). The main structural units of the crystals of I and II are the [[UO2(C2O4)(NCS)]? chains belonging to the crystal-chemical group AK02M1 (A = UO 2 2+ , K02 = C2O 4 2? , M1 = NCS? of the uranyl complexes. The uranium-containing chains are joined into a three-dimensional framework through electrostatic interactions with the outer-sphere cations and hydrogen bonds involving the water molecules. 相似文献
13.
Y. G. Sun W. Yu L. Wang S. T. Rong Y. L. Wu M. C. Zhu E. J. Gao 《Russian Journal of Coordination Chemistry》2010,36(1):43-47
Under hydrothermal conditions, the complex [Mn(lmdc)2(H2O)2] · 2H2O (I) was synthesized and characterized by elemental analysis and IR spectrum (HImdc = 4,5-imidazofedicarboxylic acid). The crystal structure of I was determined by single-crystal X-ray diffraction (crystallizing in the monoclinic crystal system, P 2/c space group, a = 11.000(2), b = 7.1281(14), c = 12.696(3) Å, β = 122.45(3), Z = 2. In I, the Mn2+ ion was chelated by two Imdc with one of their nitrogen atoms and a carboxylic oxygen atom, while two water molecules occupy the axial position of the Mn atom forming a distorted octahedral geometry. Three-dimensional structure of I was formed by intermolecular hydrogen bonds. UV-Vis and fluorescence spectra of I interacting with DNA show that insertion is the main binding mode between I and fish sperm DNA. Gel electrophoresis shows that I cleaves both supercoiled and circular pBR322 DNA to form a small molecular fragment. 相似文献
14.
Sabri Hassen Hammouda Chebbi Mohamed Faouzi Zid Youssef Arfaoui 《Journal of the Iranian Chemical Society》2018,15(12):2659-2668
The 3-amino-1,2,4-triazole (atz)-based manganese complex was prepared and characterized through single-crystal X-ray diffraction, IR, EPR, and UV–visible spectroscopy. In the crystal structure, individual complex are interconnected through N(O)–H…Cl hydrogen bonds into 1D undulating chains running parallel to the [110] direction of the unit cell. Chains further grow into 2D supramolecular layers by way of the lattice water molecules of coordination and the chloride anions (O–H…Cl). Layers pack along the b-axis of the unit cell mediated by O–H…Cl(N) and N–H…O(Cl) hydrogen bonds forming a 3D supramolecular architecture. The theoretical calculations were also performed to optimize the structure of the complexes in the gas phase to confirm the structures proposed by X-ray crystallography. In addition, IR and UV–visible spectra of complex were calculated and compared with the corresponding experimental spectra to complete the experimental structural identification. The three-dimensional Hirshfeld surface (3D-HS) and their relative two-dimensional fingerprint plots (2D-FP) reveal that the structure is dominated by H…Cl/Cl…H (50.5%), H…O/O…H (11.3%) and N…O/O…N (10.2%) contacts. 相似文献
15.
V. N. Serezhkin A. G. Verevkin O. P. Smirnov V. P. Plakhtii 《Russian Journal of Inorganic Chemistry》2010,55(10):1600-1606
A powder of deuterated rubidium diselenatouranylate dihydrate Rb2UO2(SeO4)2 · 2D2O has been studied by neutron diffraction. The compound is orthorhombic, space group Pna21, with the following unit cell parameters: a = 13.654(2) Å, b = 11.863(2) Å, c = 7.625(1) Å, Z = 4, R F = 3.77, R I = 6.12, and χ2 = 2.21. Basic structure units are [UO2(SeO4)2 · D2O]2? layers belonging to the AB 2 2 M1 crystal-chemical group (A = UO 2 2+ , B2 = SeO 4 2? , M1 = D2O) of uranyl complexes. The hydrogen atoms if the water molecules involved in the layer form intralayer hydrogen bonds with the terminal oxygen atoms of selenate ions. The outer-sphere water molecules are coordinated to the rubidium ions and are involved in hydrogen bonding with oxygen atoms of neighboring [UO2(SeO4)2 · D2O]2? layers. 相似文献
16.
A novel Salen-type bisoxime ligand, 6,6′-dimethoxy-2,2′-[(1,4-butylene)dioxybis(nitrilomethylidyne)]diphenol (H2L) and its tetranuclear Cu(II) complex, [Cu4L2(pic)4(H2O)2]·2H2O, have been synthesized and characterized by elemental analyses, IR, TG-DTA and 1H-NMR etc. The X-ray crystal structure of the complex reveals that formation of a tetranuclear structure, which consists of four copper(II)
atoms, two pentadentate L2−units, four picratols, two coordinated water molecules and two crystallizing water molecules. Around four copper ions are
all octahedral geometries. It was demonstrated that the picratols in the tetranuclear copper(II) complex show a novel tridentate
coordination mode. 相似文献
17.
Hong-Mei Ye Ke-Zhong Wu Jian-Jun Zhang Shu-Jing Sun Juan-Fen Wang Shu-Ping Wang 《Russian Journal of Inorganic Chemistry》2011,56(12):1914-1917
A novel lanthanide complex of [Nd(2-EOBA)3(phen)(H2O)]2 · H2O (2-EOBA = 2-ethoxylbenzoate, phen = 1,10-phenanthroline), has been synthesized and structurally characterized by single crystal X-ray diffraction. The complex crystallizes in monoclinic, space group P2(1)/n with a = 14.7453(18) Å, b = 12.3628(15) Å, c = 19.473(2) Å, α = 90°, β = 93.349(2)°, γ = 90°. Two Nd3+ ions are connected together by two bridging 2-EOBA ligands and each Nd3+ ion is further coordinated by two chelating 2-EOBA ligands, one chelating phen molecule and one water molecule. The coordination number of Nd3+ ion is nine. The coordination geometry of Nd3+ ion is a distorted monocapped square-antiprism. 相似文献
18.
N. A. Sanina S. M. Aldoshin T. N. Rudneva N. I. Golovina G. V. Shilov Yu. M. Shul’ga V. M. Martynenko N. S. Ovanesyan 《Russian Journal of Coordination Chemistry》2005,31(5):301-306
Binuclear iron nitrosyl complex Na2[Fe2(S2O3)2(NO)4] · 4H2O (I) was synthesized by the reaction of iron(II) sulfate with sodium thiosulfate in the flow of NO gas. According to X-ray diffraction data, the [Fe2(S2O3)2(NO)4]2– anion has binuclear centrosymmetric structure with Fe atoms bonded by the µ-S atoms of thiosulfate groups. The isomeric shift for complex I =0.168(1) mm/s and quadrupole splitting E
Q
=1.288 mm/s at T=80 K. When heated, complex I transforms to Na2[Fe2(S2O3)2(NO)4] (II), whose unit cell parameters found by X-ray diffraction method differ from those of complex I. The process of transformation of I to II was studied by calorimetric method. Complex I transforms to complex II without chemical decomposition, which was confirmed by IR and mass spectroscopy data.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 5, 2005, pp. 323–328.Original Russian Text Copyright © 2005 by Sanina, Aldoshin, Rudneva, Golovina, Shilov, Shulga, Martynenko, Ovanesyan. 相似文献
19.
Yu. V. Kokunov V. V. Kovalev Yu. E. Gorbunova S. A. Kozyukhin 《Russian Journal of Coordination Chemistry》2016,42(9):614-619
The reactions of 2,2'-pyridyl, (2-Py)C(O)C(O)(2-Py), with the Cd(II) compounds under various conditions are studied. The medium and nature of the anions exert a decisive effect on the compositions and structures of the formed cadmium complexes. The reaction of cadmium diacetate with 2,2'-pyridyl in an aqueous-alcohol medium in air affords coordination compound [Cd(Рic)2(H2O)2] · H2O (I) (Pic? is picolinate ion, CO2C5H4N), and its crystal structure is determined. The crystals are monoclinic: space group P21/c, a = 7.499(1), b = 15.676(1), с = 12.719(1) Å, β = 94.79(1)°, V = 1490.0(2) Å3, Z = 4, ρcalcd = 1.502 g/cm3. The molecular packing of compound I is a supramolecular 3D framework consisting of discrete complexes [Cd(Pic)2(H2O)2] linked by hydrogen bonds O–H…O. The coordination sphere of Cd2+ contains two O atoms and two N atoms of the ligand and two water molecules. The coordination polyhedron of Cd2+ is a distorted octahedron. 相似文献
20.
Nanorods of orthorhombic V3O7 · H2O with the parameters a = 16.805 Å, b = 9.428 Å, and c = 3.660 Å are prepared under hydrothermal conditions (T = 180–190°C, τ = 30–40 h) from the V2O5 · nH2O/H2C2O4 · 2H2O composite. The particle diameter is 40–70 nm, and the length is several micrometers. The IR spectra, electric conductivity, and thermal properties of the nanorod powder are studied. In air V3O7 · H2O begins to decompose at temperatures above 150°C, and at 350°C nanobelts V2O5 40–100 nm wide and 40 µm long are formed. A mechanism of nanostructure formation is suggested. 相似文献