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1.
《Journal of solid state chemistry》1986,62(2):274-277
Fe2F5(H2O)2 is related to the weberite structure, whose space group is not clearly defined. A careful reexamination of the structure confirms and refines the previous results: Fe2F5(H2O)2 belongs to the space group Imma with cell parameters a = 7.477(1) Å, b = 10.862(2) Å, c = 6.652(1) Å (Z = 4). The structure has been refined from 379 reflections to R = 0.029 (Rw = 0.034). Fe2F5(H2O)2 must be considered as an antiweberite structure since M2+ and M3+ positions are inverse of those of the weberite structure. 相似文献
2.
FeIIFeIII2F8(H2O)2 and MnFe2F8(H2O)2, grown by hydrothermal synthesis (), crystallize in the monoclinic system with cell dimensions (Å): a = 7.609(5), b = 7.514(6), c = 7.453(4), β = 118.21(3)°; and a = 7.589(6), b = 7.503(8), c = 7.449(5), β = 118.06(3)°, and space group . The structure is related to that of . It is described in terms of perovskite type layers of Fe3+ octahedra separated by Fe2+ or Mn2+ octahedra, or in terms of shifted hexagonal bronze type layers. Both compounds present a weak ferromagnetism below TN (157 and 156 K, respectively). Mössbauer spectroscopy points to an “idle spin” behavior for FeIIFeIII2F8(H2O)2: only Fe3+ spins order at TN, while the Fe2+ spins remain paramagnetic between 157 and 35 K. Below 35 K, the hyperfine magnetic field at the Fe2+ nuclei is very weak: Hhf = 47 kOe at T = 4.2 K. For MnFe2F8(H2O)2, Mn2+ spin disorder is expected at 4.2 K. This “idle spin” behavior is due to magnetic frustration. 相似文献
3.
《Journal of Inorganic and Nuclear Chemistry》1978,40(3):437-439
The slow reaction of Cr(H2O)63+ with Co(CN)63− produces (H2O)CrNCCo(CN)5. The rapid reaction of Co(CN)5N33− with nitrious acid in the presence of Cr)OH2)5CN2+ produces (H2O)5CrCNCo(CN)5. The two binuclear complexes were separated and purified by cation and anion exchange procedures. The orientation of the bridging cyanide in the isomeric complexes was determined by a spectroscopic technique. For (H2O)5CrNCCo(CN)5 the 4A2g → 4T2g and 4A2g → 4T1g of the chromium moiety are at 560 and 401 nm, respectively, and the 1A1g → 1T1g of the cobalt moiety is at 310 nm. For (H2O)5CrCNCo(CN)5 the 4A2g → 4T2g band is at 552 nm, but the 4A2g → 4T1g absorption of the chromium is obscured by the 1A1g → 1T1g transition of the cobalt at 347 nm. The base hydrolysis of (H2O)5CNCCo(CN)5 produces Co(CN)63− and “chromite” quantitatively. The vase hydrolysis of (H2O)5CrCNCo(CN)5 produces chromite and an unidentified cobalt(III) species that absorbs at 345–347 nm. 相似文献
4.
Kurt Mereiter 《Acta Crystallographica. Section C, Structural Chemistry》2013,69(10):1085-1090
The title compound, tricaesium sodium iron(III) μ3‐oxido‐hexa‐μ2‐sulfato‐tris[aquairon(III)] pentahydrate, Cs2.91Na1.34Fe3+0.25[Fe3O(SO4)6(H2O)3]·5H2O, belongs to the family of Maus's salts, K5[Fe3O(SO4)6(H2O)3]·6H2O, which is based on the triaqua‐μ3‐oxido‐hexa‐μ‐sulfato‐triferrate(III) anion, [Fe3O(SO4)6(H2O)3]5−, with Fe in a characteristically distorted octahedral coordination environment, sharing a common corner via an oxide O atom. Cs in four different cation sites, Na in three different cation sites and five water molecules link the anions in three dimensions and set up a crystal structure in which those parts parallel to (001) and within 0.05 < z < 0.95 have a distinct trigonal pseudosymmetry, whereas the cation arrangement and bonding near z∼ 0 generate a clear‐cut noncentrosymmetric polar edifice with the monoclinic space group C2. The structure shows some cation disorder in the region near z ∼ , where one Na atom in octahedral coordination is partly substituted by Fe3+, and a Cs atom is substituted by small amounts of Na on a separate nearby site. One Na atom, located on a twofold axis at z = 0 and tetrahedrally coordinated by four sulfate O atoms of two [Fe3O(SO4)6(H2O)3]5− units, plays a key role in generating the noncentrosymmetric structure. Three of the seven different cation sites are on twofold axes (one Na+ site and two Cs+ sites), and all other atoms of the structure are in general positions. 相似文献
5.
The non-centrosymmetric microporous fluorinated iron phosphate, (H3O)2[Fe4(H2O)2F4(PO4)2(HPO4)2](H2O), is endowed with properties. In fact, the thermogravimetric analysis study shows a mass loss evolution as a temperature function. The optical study was also examined by UV–vis absorption. The magnetic results reveal the appearance of a ferromagnetic behavior at low temperature (Tc = 11.64 K). 相似文献
6.
Alexander I. Gubanov Natalia V. Kuratieva 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(10):i83-i85
The structures of orthorhombic bis[pentaammineaquacobalt(III)] tetra‐μ2‐fluorido‐tetradecafluoridotrizirconium(IV) hexahydrate (space group Ibam), [Co(NH3)5(H2O)]2[Zr3F18]·6H2O, (I), and bis[hexaamminecobalt(III)] tetra‐μ2‐fluorido‐tetradecafluoridotrizirconium(IV) hexahydrate (space group Pnna), [Co(NH3)6]2[Zr3F18]·6H2O, (II), consist of complex [Co(NH3)x(H2O)y]3+ cations with either m [in (I)] or and 2 [in (II)] symmetry, [Zr3F18]6− anionic chains located on sites with 222 [in (I)] or 2 [in (II)] symmetry, and water molecules. 相似文献
7.
Qing-Ping Hu Xue-Gui Cui Zhao-He Yang 《Journal of Thermal Analysis and Calorimetry》1997,48(6):1379-1384
The thermal decomposition of the mixed-ligand complex of iron(III) with 2-[(o-hydroxy benzylidene)amino] phenol and pyridine-[Fe2O(OC6H4CH=NC6H4O)2(C5H5N)4]·2H2O and its non-isothermal kinetics were studied by TG and DTG techniques. The non-isothermal kinetic data were analyzed and the kinetic parameters for the first and second steps of the thermal decomposition were evaluated by two different methods, the Achar and Coats-Redfern methods. Steps 1 and 2 are both second-order chemical reactions. Their kinetic equations can be expressed as: dα/dt=Ae?E/RT(1-α)2 相似文献
8.
E. Herdtweck 《无机化学与普通化学杂志》1983,501(6):131-136
Crystal Structure of the Mixed-Valence Iron Fluorid Hydrate Fe3F8 · 2 H2O Newly prepared was the red, monoclinic compound Fe3F8 · 2 H2O, single crystals of which could be obtained under hydrothermal high pressure conditions (space group C2/m with a = 761.2(3), b = 750.0(1), c = 746.9(3) pm, β = 118.38(2)° and Z = 2). The X-ray structure determination (RG = 0.0192 and 635 reflexions) yielded a framework structure, in which layers of octahedra 2[FeIIIF6/2] are connected via corners of [FeIIF4/2(H2O)2]-octahedra. The average distances in the nearly ideal octahedra are FeIII? F = 193.0, FeII? F = 208.1 and FeII? OH2 = 211.5 pm. 相似文献
9.
《Microporous Materials》1997,8(3-4):103-112
Fe4F3(PO4)(HPO4)4(H2O)4(N2C3H12) (labelled ULM-15) was prepared hydrothermally (7 days, 453 K, autogenous pressure) in the presence of 1,3-diaminopropane as organic template. Its structure was determined by single crystal X-ray diffraction. ULM-15 is monoclinic (Space group C2/c (no 15)) with lattice parameters a = 24.176(1) , b = 14.558(1) , c = 7.186(1) , β = 102.3(1)°, V = 2470.8(3) 3, Z = 4. Its three-dimensional framework is constituted from corner-sharing FeX6 (X = O, F, H2O) octahedra and tetrahedral PO4 and HPO4 groups. The structure presents trans-chains of FeO4F2 octahedra related to ferric dimers [Fe2O8F2(H2O)2] by tetrahedral units. They delimit 16-membered rings channels along [001] in which the diprotonated amines are inserted. ULM-15 shows 3D antiferromagnetic behaviour below TN ≈ 22 K. 相似文献
10.
J. Wang X. Zh. Liu Zh. H. Zhang X. D. Zhang G. R. Gao Y. M. Kong Y. Li 《Journal of Structural Chemistry》2006,47(5):906-912
K3[DyIII(nta)2(H2O)]·5H2O and (NH4)3[DyIII(nta)2] have been synthesized in aqueous solution and characterized by IR, elemental analysis and single-crystal X-ray diffraction techniques. In K3[DyIII(nta)2(H2O)]·5H2O the DyIII ion is nine coordinated yielding a tricapped trigonal prismatic conformation, and its crystal belongs to monoclinic system and C2/c space group. The crystal data are as follows: a = 15.373(5) Å, b = 12.896(4) Å, c = 26.202(9) Å; β = 96.122(5)°, V = 5165(3) Å3, Z = 8, D c = 1.965 g·cm?3, μ = 3.458 mm?1, F(000) = 3016, R 1 = 0.0452 and wR 2 = 0.1025 for 4550 observed reflections with I ≥ 2σ(I). In (NH4)3[DyIII(nta)2] the DyIII ion is eight coordinated yielding a usual dicapped trigonal anti-prismatic conformation, and its crystal belongs to monoclinic system and C2/c space group. The crystal data are as follows: a = 13.736(3) Å, b = 7.9389(16) Å, c = 18.781(4) Å; β = 104.099(3)°, V = 1986.3(7) Å3, Z = 2, D c = 1.983 g·cm?3, μ = 3.834 mm?1, F(000) = 1172, R 1 = 0.0208 and wR 2 = 0.0500 for 2022 observed reflections with I ≥ 2σ(I). The results indicate that the difference in counter ion also influences coordination numbers and structures of rare earth metal complexes with aminopolycarboxylic acid ligands. 相似文献
11.
Single crystals of [Eu(C4H4O6)(H2O)2](H2O)2 were obtained from the combination of solutions of EuCl2, previously obtained by electrolysis of an aqueous solution of EuCl3, and tartraric acid, neutralized by LiOH. The crystal structure (orthorhombic, P212121, Z = 4, a = 948.9(1), b = 954.6(1), c = 1098.4(1) pm; R(F) = 0.0242 and Rw(F2) = 0.0585 for I > 2σ(I); R(F) = 0.0256 and Rw(F2) = 0.0592 for all data) is isotypic with [Ca(C4H4O6)(H2O)2](H2O)2 and [Sr(C4H4O6)(H2O)2](H2O)2 exhibiting a three‐dimensional structure. The divalent cations (Eu2+, Ca2+, Sr2+) are eight‐coordinate by oxygen atoms that originate from carboxylate and hydroxyl groups of the tartraric dianion and two of the four water molecules. 相似文献
12.
Wen‐Tong Chen Prof. Dr. Ya‐Ping Xu Qiu‐Yan Luo Xiao‐Niu Fang Hua‐Long Chen 《无机化学与普通化学杂志》2008,634(3):529-533
The first heterometallic 4f‐5d inorganic‐organic metal‐isonicotinic acid hybrid [{Er(NC5H4COOH)(H2O)2}2(H5O2)(HgCl5)(HgCl4)2(H2O)2]n ( 1 ) has been synthesized via hydrothermal reaction and structurally characterized. Complex 1 crystallizes in the space group C2/c of the monoclinic system with four formula units per unit cell: a = 24.194(3), b = 20.792(3), c = 15.289(4) Å, β = 128.39(2)°, V = 6028(2) Å3, C36H47Cl13Er2Hg3N6O20, Mr = 2280.94, Dc = 2.513 g/cm3, S = 0.929, μ(MoKα) = 11.017 mm?1, F(000) = 4248, R = 0.0425 and wR = 0.0739. The crystal structure analysis reveals that the title complex is characteristic of a one‐dimensional chain‐like structure. Photoluminescent investigation reveals that the title complex displays interesting emissions. Optical absorption spectra of 1 reveal the presence of an optical gap of 3.45 eV. The magnetic properties show that complex 1 exhibits antiferromagnetic interactions. 相似文献
13.
Complexes of 5-(phenylazo)-2-thiohydantoin (L1) and 5-(2-hydroxyphenylazo)-2-thiohydantoin (HL2) with Co(II), Ni(II) and Cu(II) salts have been synthesised and characterized by elemental analysis, conductivity, magnetic susceptibility, UV-Vis, IR, ESR and TG studies. The magnetic and spectral data suggested octahedral geometry for [L1M(OAc)2(H2O)2]·xH2O {M=Nill and Cull} and [L1CuCl2(H2O)]·H2O (dimeric form for the latter), trigonal bipyramidal geometry for [L2Co(OAc)(H2O)]·2H2O, square pyramidal geometry for [L2Ni(OAc)(H2O)]·H2O and square planar geometry for [L2CuCl]·2H2O. TG studies confirmed the chemical formulations of these complexes and showed that their thermal degradation takes place in three to five steps, depending on the type of the ligand and the geometry of the complex. The kinetic parameters (n, E#, A, ΔH#, ΔS# and ΔG#) of the thermal decomposition stages were computed using the Coats-Redfern and other standard equations and are discussed. 相似文献
14.
Gregory J. Kubas Phillip J. Vergamini Michael P. Eastman Keith B. Prater 《Journal of organometallic chemistry》1976,117(1):71-79
In order to gain some insight into the stability of configuration and the bonding in the novel disulfide-containing complex [(η-C5H5)2Fe2S2(SC2H5)2], electrochemical properties of this compound and its SCH3 and SCH2C6H5 analogues were studied in various solvents and the magnetic properties of a subsequently isolated paramagnetic monocation were investigated. The cyclic voltammogram of [(η-C5H5)2Fe2S2(SC2H5)2] shows a reversible one-electron oxidation at E= +0.21 V and a quasi-reversible one-electron oxidation at E = +0.90 V (vs.saturated calomel electrode). The stable monocation has been electrochemically synthesized and the magnetic suceptibility shows a simple paramagnetic behavior with one unpaired electron per dimeric unit. Frozen solutions of this species at 103K yielded anisotropic ESR spectra with g1 = 2.135, g2 = 1.976, and g3 = 1.934. Labeling the complex with 33S in the disulfide bridge resulted in no observable hyperfine splitting or line broadening in the ESR. The dicationic species is unstable with respect to loss of the S2 bridge and formation of a solvent-ligated dication, [(η-C5H5)Fe(NCCH3)(SC2H5)]22+, isolated by electrolysis of the monocation at +1.2 V in CH3CN. 相似文献
15.
Maria Manewa Maria Manewa 《Monatshefte für Chemie / Chemical Monthly》1975,106(4):915-923
The IR and Raman spectra ofM(BF4)2·6H2O forM=Mg2+, Zn2+ and Cd2+ in the range 4000–140 cm?1 were recorded, as were theirDTA andTG curves up to 500°C. The data obtained confirm the presence of the water complex [M(H2O)6]2+ and of the complex anion BF4 ? in these compounds. It was also established that the six water molecules in Mg(BF4)2·6H2O and in Zn(BF4)2·6H2O are not crystallographically equivalent, and that hydrogen bonds of the type H2O...H2O...F4B and H2O...H2O...H2O participate in the structure. The energy of the hydrogen bonds H2O...F4B for the three crystal hydrates was also calculated. The thermal and thermogravimetric data are in agreement with and confirm the spectroscopic data. 相似文献
16.
Dr. Leokadiya V. Zorina Dr. Sergey V. Simonov Dr. Valentina D. Sasnovskaya Dr. Artem D. Talantsev Prof. Dr. Roman B. Morgunov Dr. Vladimir S. Mironov Prof. Dr. Eduard B. Yagubskii 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(64):14583-14597
Reactions of [Mn(H2dapsc)Cl2] ⋅ H2O (dapsc=2,6- diacetylpyridine bis(semicarbazone)) with K3[Fe(CN)6] and (PPh4)3[Fe(CN)6] lead to the formation of the chain polymeric complex {[Mn(H2dapsc)][Fe(CN)6][K(H2O)3.5]}n ⋅ 1.5n H2O ( 1 ) and the discrete pentanuclear complex {[Mn(H2dapsc)]3[Fe(CN)6]2(H2O)2} ⋅ 4 CH3OH ⋅ 3.4 H2O ( 2 ), respectively. In the crystal structure of 1 the high-spin [MnII(H2dapsc)]2+ cations and low-spin hexacyanoferrate(III) anions are assembled into alternating heterometallic cyano-bridged chains. The K+ ions are located between the chains and are coordinated by oxygen atoms of the H2dapsc ligand and water molecules. The magnetic structure of 1 is built from ferrimagnetic chains, which are antiferromagnetically coupled. The complex exhibits metamagnetism and frequency-dependent ac magnetic susceptibility, indicating single-chain magnetic behavior with a Mydosh-parameter φ=0.12 and an effective energy barrier (Ueff/kB) of 36.0 K with τ0=2.34×10−11 s for the spin relaxation. Detailed theoretical analysis showed highly anisotropic intra-chain spin coupling between [FeIII(CN)6]3− and [MnII(H2dapsc)]2+ units resulting from orbital degeneracy and unquenched orbital momentum of [FeIII(CN)6]3− complexes. The origin of the metamagnetic transition is discussed in terms of strong magnetic anisotropy and weak AF interchain spin coupling. 相似文献
17.
É. B. Miminoshvili K. É. Miminoshvili S. R. Zazashvili L. A. Beridze 《Journal of Structural Chemistry》2006,47(6):1188-1192
Synthesis of [Cu(m-HBH)2(OH2)2](NO3)2·2H2O, where m-HBH = C7H8O2N2 (3-hydroxybenzoylhydrazine), is described. The structure of the compound was studied by X-ray phase analysis and IR spectroscopy; crystal data are a = 57.415(6) Å, b = 19.760(2) Å, c = 7.586(2) Å; Fdd 2, Z = 16, R(F) = 0.053. The compound consists of [Cu(m-HBH)2(OH2)2]2+ complex cations, NO 3 ? anions, and two water molecules. The similarity between the IR spectra of Cu(m-HBH)2(NO3)2·nH2O and Co(m-HBH)2(NO3)2·5H2O, element analysis data, and crystal data obtained at the first stage of X-ray analysis show that the structures and compositions of these compounds are identical relative to the type of surroundings of the central atom. In contrast to the cobalt compound [Co(m-HBH)2(OH2)2](NO3)2·3H2O, in which the cobalt atom has a nearly regular octahedron as a coordination polyhedron, the copper(II) compound has a square bipyramid around the copper atom; c.n. is 6 = 4 + 2 (planar distances: 2.013(2) Å, 2.021(2) Å, 2.033(3) Å, 2.087(3) Å; axial distances: 2.367(3) Å, 2.374(3) Å) and lacks one crystallization water molecule. 相似文献
18.
Mono- and Dinuclear Fluoro Complexes of Titanium (III), Chromium (III), and Iron(III). Syntheses and Structures of (NMe4) (Ti(H2O)4F2)TiF6 · H2O, (NMe4)3Cr2F9, and (NMe4)3Fe2F9 The title compounds have been prepared by reaction of MCl3 (M = Ti, Cr, Fe) with NMe4F in dimethylformamide. (NMe4)3Cr2F9 and (NMe4)3Fe2F9 contain the face-sharing biocathedral M2F93? unit. The M…M distances are 277.1(1) and 289.8(3) pm in (NMe4)3Cr2F9 and (NMe4)Fe2F9, respectively. (NMe4)(Ti(H2O)4F2)TiF6 · H2O contains trans-TiIII(H2O)4F2+ cations and TiIVF62? anions. Crystal data: (NMe4)3Cr2F9: hexagonal, space group P63/m, a = 804.1(3), c = 1857.5(4) pm, Z = 2, 529 reflections, R = 0.049; (NMe4)3Fe2F9: hexagonal, space group P63/m, a = 804.7(5), c = 1 861.6(5) pm, Z = 2, 635 reflections, R = 0,046; (NMe4)(Ti(H2O)4F2)TiF6 · H2O: orthorhombic, space group Pbca, a = 776.9(2), b = 1 616.3(3), c = 2 428.6(7) pm, Z = 8, 2 784 reflections, R = 0,056. 相似文献
19.
The novel tetrameric gadolinium(III) compound [Gd4(OH)4(CF3COO)8(H2O)4] · 2.5 H2O was synthesized and structurally characterized by X‐ray crystallography. The Gd3+ ions are bridged by hydroxide ions and carboxylate groups to tetramers with Gd3+‐Gd3+ distances between 384.2(2) and 388.1(2) pm. The compound crystallizes in the monoclinic space group C2/c (Z = 4). The magnetic behaviour of [Gd4(OH)4(CF3COO)8(H2O)4] · 2.5 H2O was investigated in the temperature range of 2 to 300 K. The magnetic data of this compound indicate antiferromagnetic interactions (Jex = ?0.0197 cm?1). 相似文献
20.
I. V. Medrish E. V. Peresypkina A. V. Virovets L. B. Serezhkina 《Russian Journal of Coordination Chemistry》2006,32(12):910-914
The single crystals of (C2H7N4O)2[UO2(C2O4)2(H2O)] were studied by X-ray diffraction. The crystals are monoclinic, space group Pn, Z = 2, unit cell parameters: a = 9.4123(2) Å, b = 8.4591(2) Å, c = 11.8740(3) Å, β = 105.500(10)°, V = 911.02(4) Å3. The main structural units of the crystals of I are islet complex groups [UO2(C2O4)2(H2O)]2? corresponding to the crystal chemical group AB 2 01 M1 (A = UO UO 2 2+ , B01 = C2O 4 2? , M = H2O) of uranyl complexes. Uranium-containing mononuclear complexes are connected into a three-dimensional framework through the electrostatic interactions and hydrogen bonding system involving carbamyolguanidinium ions. 相似文献