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1.
Julia N. Zaitseva Igor S. Yakimov Sergei D. Kirik 《Journal of solid state chemistry》2009,182(8):2246-2251
Details of quaternary compounds formation in the system NaF–CaF2–AlF3 are specified. To achieve this aim, the samples of phases NaCaAlF6 and Na2Ca3Al2F14 have been obtained by high-temperature solid-phase synthesis. Their thermal behavior when heated up to 800 °C has been studied using the methods of high-temperature X-ray diffraction (XRD) and thermal analysis (TA). The system under consideration can be regarded as a quasibinary section CaF2–NaAlF4, where at T=745–750 °C invariant equilibrium is implemented with the phases CaF2–NaCaAlF6–Na2Ca3Al2F14–(liquid melt)–(NaAlF4). The peculiarity of the equilibrium is NaAlF4 metastability at normal pressure. Below the equilibrium temperature the quaternary phase Na2Ca3Al2F14 is stable and NaCaAlF6 above this temperature. The phase NaCaAlF6 fixed by rapid quenching from high temperatures and when heated up to 640 °C decomposes, yielding Na2Ca3Al2F14. Further heating in vacuum at temperature up to 740 °C results in decomposition of Na2Ca3Al2F14 into CaF2 and Na3AlF6. The expected reverse transformation of Na2Ca3Al2F14 into NaCaAlF6 has not been observed under experimental conditions. Transformations in bulk samples reveal direct and reverse transformation of quaternary phases.
Synopsis
Thermal transformation of the quaternary compounds in system (NaF–CaF2–AlF3) was investigated using high-temperature X-ray diffraction (XRD) and thermal analysis (TA). In the system the invariant equilibrium is implemented with the phases CaF2–NaCaAlF6–Na2Ca3Al2F14–(liquid melt)–(NaAlF4) at T=745–750 °C. 相似文献2.
James Trevey Jum Suk Jang Yoon Seok Jung Conrad R. Stoldt Se-Hee Lee 《Electrochemistry communications》2009,11(9):1830-1833
We report that glass–ceramic Li2S–P2S5 electrolytes can be prepared by a single step ball milling (SSBM) process. Mechanical ball milling of the xLi2S·(100 − x)P2S5 system at 55 °C produced crystalline glass–ceramic materials exhibiting high Li-ion conductivity over 10−3 S cm−1 at room temperature with a wide electrochemical stability window of 5 V. Silicon nanoparticles were evaluated as anode material in a solid-state Li battery employing the glass–ceramic electrolyte produced by the SSBM process and showed outstanding cycling stability. 相似文献
3.
Donata Mazzone Pietro Manfrinetti Maria L. Fornasini 《Journal of solid state chemistry》2009,182(9):2344-2349
Phases YbZn1−xAlx, YbZn2−xAlx and YbZn3−xAlx were studied by electron microprobe analysis and X-ray single crystal and powder methods. The compound YbZn0.8Al0.2 crystallizes with the CsCl-type, a=3.635(2) Å. Four phases were investigated by single crystal X-ray diffraction: YbZn0.996(6)Al1.004(6), MgNi2-type, P63/mmc, a=5.573(1), c=18.051(3) Å, Z=8, wR2=0.040 and YbZn0.88(3)Al1.12(3), MgCu2-type, , a=7.860(2) Å, Z=8, wR2=0.060, both showing mixed Zn/Al occupancy; YbZn2.50(1)Al0.50(1), CeNi3-type, P63/mmc, a=5.496(1), c=17.336(2) Å, Z=6, wR2=0.036 and YbZn1.92(2)Al1.08(2), PuNi3- or NbBe3-type, , a=5.499(1), c=26.134(5) Å, Z=9, wR2=0.053, where the zinc atoms are ordered in the CaCu5 segment, while share the sites with aluminium in the Laves phase segment. In the pseudobinary section YbZn2−xAlx four structures occur in sequence with increasing the electron concentration: CeCu2 or KHg2 (x=0–0.3), MgZn2 (x=0.33–0.54), MgNi2 (x=0.68–1.01) and MgCu2 (x=1.12–2). This sequence agrees with the results of first-principles calculations, already reported in the literature for other similar series. In the YbZn3−xAlx section CeNi3-type compounds occur with x=0.40–0.88 followed by PuNi3-type compounds with x=0.92–1.10. The stability ranges of these phases are related to the valence electron concentration. 相似文献
4.
The solid solution Li8−2xCaxCeO6 (0 < x ≤ 0,5) and the definite phase Li6CaCeO6 have been obtained at 800°C through a study of Li---Ca---Ce---O system. Electrical measurements on the doped phases Litetr.6 [Li2-2xCaxCe□]oct.O6 show that the conductivity varies slightly with the creation of vacancies in the octahedral layers. This result unambiguously confirms the following diffusion mechanism: the conduction is assumed essentially by lithium ions located in the tetrahedral layers. The compound Li6CaCeO6 is isostructural with Li6In2O6. The cell is trigonal,
Å, c = 10,603 Å, c/a = 1,0587, and Z = 6. This new quaternary phase, which belongs to the same structural family of oxides of the type Li8MO6, either pure or doped with calcium, may be represented by the formula Litetr.6[Ca Ce□]oct.O6. Electrical and structural data are correlated for this compound. 相似文献
5.
Kateryna V. Terebilenko Igor V. Zatovsky Nikolay S. Slobodyanik Konstantin V. Domasevitch Denis V. Pushkin Vyacheslav N. Baumer Valentina S. Sudavtsova 《Journal of solid state chemistry》2007,180(12):3351-3359
Phase equilibrium in the pseudo-quaternary system K2O–MoO3–P2O5–Bi2O3 was studied as three-component solvent K2MoO4–KPO3–MoO3 containing 15 mol% Bi2O3 during slow cooling and spontaneous crystallization. The results of the investigation were shown on a composition diagram, which indicates the crystallization fields of K2Bi(PO4)(MoO4), K5Bi(MoO4)4, BiPO4 and K3Bi5(PO4)6. New phosphate K3Bi5(PO4)6 was characterized by single-crystal X-ray diffraction (space group C2/c, a=17.680(4), b=6.9370(14), c=18.700(4) Å, β=113.79(3)°) and FTIR spectroscopy. The possibility of lone electron pair stereoactivity of bismuth was suggested using the calculations of characteristics of the Voronoi–Dirichlet polyhedra for K3Bi5(PO4)6 and K2Bi(PO4)(MoO4). 相似文献
6.
K. Yokoyama N. Haketa M. Hashimoto K. Furukawa H. Tanaka H. Kudo 《Chemical physics letters》2000,320(5-6)
Lithium-excess binary clusters LinFn−1 (n=2–9) were detected by photoionization time-of-flight mass spectrometry in a supersonic cluster beam generated by a laser ablation of a solid mixture of lithium fluoride and nitride. Laser power dependence of the Li2F+ signal intensity has indicated that the ionization energy of the hyperlithiated Li2F molecule is lower than 4.66 eV. The theoretical vertical ionization energy obtained by the CCSD(T)/6-311+G(d)//B3LYP/6-311+G(d) calculations are 4.47 eV. No nitrogen-containing clusters were detected. The absence of Li4N is ascribed to the exothermicity of the reaction, 2Li3N→N2+Li6. 相似文献
7.
The reaction of hexafluoro-cyclo-triphosphazene P3N3F6 with ammonia in acetonitrile has been studied. New compounds, (2-imino-2,4,4,6,6-pentafluoro-2λ5,4λ5,6λ5-cyclo-triphosphaza-1,3,5-trienyl)-2-amino-4,4,6,6-tetrafluoro-2λ5,4λ5,6λ5-cyclo-triphosphaza-1,3,5-triene, P3N3F5–NH–P3N3F4NH2 (2) and cis and trans isomers of non-gem-2,4-diamino-2,4,6,6-tetrafluoro-2λ5,4λ5,6λ5-cyclo-triphosphaza-1,3,5-triene, P3N3F4(NH2)2 (4, 5), were detected by GC/MS, and 31P NMR spectroscopy in reaction mixtures. X-ray diffraction analysis of P3N3F5–NH–P3N3F4NH2 (2) revealed two conformational polymorphs, 2A and 2B, the latter being built up of two different conformers that were further denoted as 2Ba (the same as the single conformer in 2A) and 2Bb. The compound 2 was characterized by spectroscopic methods and its 2D potential energy surface (PES) was described by density functional theory computations depending on two dihedral angles. The calculated PES spans over 30 kJ/mol in energy including 8 local minima and all first and second order saddle points. The occurrence of the two experimentally observed conformers 2Ba and 2Bb seems to be governed by crystal packing effects. 相似文献
8.
B. G. Bazarov R. F. Klevtsova A. D. Tsyrendorzhieva L. A. Glinaskaya Zh. G. Bazarova 《Journal of Structural Chemistry》2004,45(6):993-998
Physicochemical analysis (XRPA, DTA) was used to study phase equilibria in a ternary salt system Rb2MoO4-Fe2(MoO4)3-Hf(MoO4)2 in the subsolidus region. Ternary molybdates with compositions 5:1:3, 5:1:2, and 1:1:1 have been found and synthesized. Crystal and thermal characteristics have been determined. Single crystals of the ternary molybdate Rb5FeHf(MoO4)6 with a composition of 5:1:2 were grown. The crystal structure of the compound was solved using X-ray diffractometry (CAD-4 automatic diffractometer, MoK
α radiation, 1766 F(hkl), R = 0.0298). Hexagonal crystals with unit cell dimensions: a = b = 10.124(1) Å, c =15.135(3) Å, V = 1343.4(4) Å3, Z = 2, ρcalc = 4.008 g/cm3, space group P63. The mixed three-dimensional framework of the structure is formed from two sorts of MoO4 tetrahedra and Fe and Hf octahedra linked through their common O-vertices. Rubidium atoms of three varieties occupy the large voids of the framework.Original Russian Text Copyright © 2004 by B. G. Bazarov, R. F. Klevtsova, A. D. Tsyrendorzhieva, L. A. Glinaskaya, and Zh. G. Bazarova__________Translated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 6, pp. 1038–1043, November–December, 2004. 相似文献
9.
Vasyl I. Zaremba Ihor R. Muts Yaroslav M. Kalychak Rolf-Dieter Hoffmann Rainer Pttgen 《Journal of solid state chemistry》2001,160(2):415
The title compound was synthesized by reacting the elements in an arc-melting apparatus under purified argon and subsequent annealing at 870 K. Ca3Ni8In4 was investigated using X-ray diffraction on both powders and single crystals: P63mc, a=898.9(1) pm, c=752.2(2) pm, wR2=0.0591, 327 F2 values, and 35 parameters. This structure is an ordered, noncentrosymmetric variant of the BaLi4 type. The nickel and indium atoms build a complex three-dimensional [Ni8In4] polyanion in which the calcium atoms fill distorted hexagonal channels. To a first approximation the formula may be written as (3 Ca2+)6+ [Ni8In4]6−. Within the polyanion the Ni1, Ni3, and Ni4 atoms form one-dimensional cluster units which extend in the c direction while the Ni2 atoms have only indium neighbors in a distorted tetrahedral coordination. The Ni–Ni distances in the cluster range from 241 to 266 pm. The cluster units are surrounded and interconnected by indium atoms. The group– subgroup relation from centrosymmetric BaLi4 to noncentrosymmetric Ca3Ni8In4 is presented. Chemical bonding in Ca3Ni8In4 and the structural relation with Lu3Co7.77Sn4, Ca3Au6.61Ga4.39, and Co2Al5 is briefly discussed. 相似文献
10.
LiFe0.5Ti1.5O4 was synthesized by solid-state reaction carried out at 900 °C in flowing argon atmosphere, followed by rapid quenching of the reaction product to room temperature. The compound has been characterized by X-ray powder diffraction (XRD) and 57Fe Mössbauer effect spectroscopy (MES). It crystallizes in the space group P4332, a = 8.4048(1) Å. Results from Rietveld structural refinement indicated 1:3 cation ordering on the octahedral sites: Li occupies the octahedral (4b) sites, Ti occupies the octahedral (12d) sites, while the tetrahedral (8c) sites have mixed (Fe/Li) occupancy. A small, about 5%, inversion of Fe on the (4b) sites has been detected. The MES data is consistent with cation distribution and oxidation state of Fe, determined from the structural data.The title compound is thermally unstable in air atmosphere. At 800 °C it transforms to a mixture of two Fe3+ containing phases – a face centred cubic spinel Li(1+y)/2Fe(5−3y)/2TiyO4 and a Li(z−1)/2Fe(7−3z)/2TizO5 – pseudobrookite. The major product of thermal treatment at 1000 °C is a ramsdellite type lithium titanium iron(III) oxide, accompanied by traces of rutile and pseudobrookite. 相似文献
11.
Shoji Yamanaka Satoshi Izumi Shoichi Maekawa Keita Umemoto 《Journal of solid state chemistry》2009,182(8):1991-2003
The La–Si binary phase diagram under a high pressure of 13.5 GPa was experimentally constructed. New superconducting silicides LaSi5 and LaSi10 were found, which have peritectic decomposition temperatures at 1000 and 750 °C, respectively. The single crystal X-ray structural analysis revealed that there are two polymorphs in LaSi5. The α-form obtained by heating a molar mixture of LaSi2 and 3 Si at about 700 °C or by a rapid cooling from 1000 °C under pressure crystallizes with the space group C2/m and the lattice parameters a=15.11(3), b=4.032(6), c=8.26(1) Å, and β=109.11(1)°. The β-form obtained by a slow cooling from 800–950 °C to 600 °C under pressure has the same space group but with slightly different lattice parameters, a=14.922(7), b=3.906(2), c=8.807(4) Å, and β=107.19(1)°. The β-form is formed during the incomplete transformation of the α-form on cooling, and has always been obtained as a mixture with the α-form. The compound can be characterized as a Zintl phase with a polyanionic framework with large tunnels running along the b axis hosting lanthanum ions. In the β-form, three of the five Si sites are disordered. The two polymorphs contain one dimensional sila-polyacene ribbons, Si ladder polymer, running along the b axis. The α-form showed superconductivity with the transition temperature Tc of 11.5 K. LaSi10 crystallizes with the space group 63/mmc and the lattice parameters a=9.623(4), c=4.723(3) Å. It is composed of La containing Si18 polyhedra (La@Si18) of hexagonal beer-barrel shape, which form straight columns by stacking along the c-axis via face sharing. One-dimensional columns of La@Si18 barrels are edge-shared, and bundled with infinite Si trigonal bipyramid chains via corner sharing. The Si atoms in the straight chains have a five-fold coordination. LaSi10 became a superconductor with Tc=6.7 K. The ab initio calculation of the electric band structures showed that α-LaSi5 and LaSi10 are metallic, and the conduction electrons mainly come from Si-3p orbitals. 相似文献
12.
The new ternary phases Zr4−xTa1+xGe4 (0.1<x<0.4) and Zr2+xTa3−xGe4 (0.1<x<1.1) were prepared from the elements by arc melting and subsequent induction heating at 1400–1450°C. Single-crystal X-ray diffraction was used to determine their structures and to refine mixed site occupancies. Zr4−xTa1+xGe4 was found to crystallize in the monoclinic space group P21/c (structure type: U2Mo3Si4) and the compound Zr2−xTa3−xGe4 shows orthorhombic symmetry (space group Pnma, structure type: Sm5Ge4). The close structural relationship between the two structures is discussed. Both phases exhibit pronounced differential fractional site occupancy of Ta and Zr on the metal sites and considerable composition ranges. Extended Hückel calculations were performed for various site occupancy models and Mulliken overlap populations for the different lattice sites of each structure were calculated for these models. The correlation of the cumulated Mulliken overlap populations and the atomic orbital populations with the actual site occupancies is discussed. 相似文献
13.
Hong Zhang Yangguang Li Liying Duan Yang Lan Enbo Wang Changwen Hu Yuangen Yao Jiutong Chen Song Gao 《Journal of solid state chemistry》2003,170(2):232-236
A new mixed Mo/Ni/Ti heteropoly compound [C5H5NH]5 [(NiOH)2Mo10O36(PO4)Ti2] has been hydrothermally synthesized and structurally determined by the single-crystal X-ray diffraction. Black prismatic crystals crystallize in the monoclinic system, space group P2(1)/n, a=11.2075(2), b=37.8328(5) c=13.0888(1) Å, β=101.4580(10)°, M=2276.13, V=5439.19(13) Å3, Z=4. Data were collected on a Siemens SMART CCD diffractometer at 293(2) K in the range of 1.68<θ<25.09° using the ω-scan technique (λ=0.71073 Å R(F)=0.0872 for 9621 reflections). The title compound contains a trimetal heteropolyanion polymer and “trans-titanium”-bridging pseudo-Keggin fragments linked to a chain. 相似文献
14.
Solid solution investigations in the CsHSO4–CsH2PO4system, carried out as part of an ongoing effort to elucidate the relationship between proton conduction, hydrogen bonding, and phase transitions, yielded the new compound Cs5(HSO4)3(H2PO4)2. Single-crystal X-ray diffraction methods revealed that Cs5(HSO4)3(H2PO4)2crystallizes in space groupC2/c(or possiblyCc), has lattice parametersa=34.066(19) Å,b=7.661(4) Å,c=9.158(6) Å, andβ=90.44(6)°, a unit cell volume of 2389.9(24) Å3, a density of 3.198 Mg m−3, and four formula units in the unit cell. Sixteen non-hydrogen atoms and five hydrogen sites were located in the asymmetric unit, the latter on the basis of geometric considerations rather than from Fourier difference maps. Refinement using anisotropic temperature factors for all non-hydrogen atoms and fixed isotropic temperature factors for all hydrogen atoms yielded residuals based onF2(weighted) andFvalues, respectively, of 0.0767 and 0.0340 for observed reflections [F2>2σ(F2)]. The structure contains layers of (CsH2XO4)2that alternate with layers of (CsHXO4)3, whereXis P or S. The arrangement of Cs, H, andXO4groups within the two types of layers is almost identical to that in the end-member compounds, CsH2PO4and CsHSO4-II, respectively. Although P and S each reside on two of the threeXatom sites in Cs5(HSO4)3(H2PO4)2, the number of protons in the structure appears fixed. In addition, the correlation of S–O and S–OH bond distances with O···O distances, where the latter represents the distance between two hydrogen-bonded oxygen atoms, was determined from a review of literature data. 相似文献
15.
Pavlo Solokha Serena De Negri Bernhard Eck Adriana Saccone 《Journal of solid state chemistry》2010,183(12):2995-3001
The crystal structures of two new ternary phases, La4Ag10Mg3 and La4Ag10.3Mg12, were refined from X-ray single crystal diffraction data. La4Ag10Mg3 crystallizes in the Ca4Au10In3 structure type, an ordered variant of the binary Zr7Ni10 compound: orthorhombic, Cmce, oS68, a=14.173(5), b=10.266(3), c=10.354(3) Å, Z=4, wR2=0.0826, 676 F2 values, 50 variables. La4Ag10.3Mg12 represents a new structure type: orthorhombic, Cmmm, oS116-10.32, a=9.6130(3), b=24.9663(8), c=9.6333(2) Å, Z=4, wR2=0.0403, 1185 F2 values, 101 variables. The structural analysis of both compounds, highlighting a significant contraction of the Ag-Mg distances, suggests the existence of three-dimensional [Ag-Mg] networks hosting La atoms. LMTO calculations applied to La4Ag10Mg3 indicate that the strongest bonds occur for Ag-Ag and Ag-Mg interactions, and confirm the presence of a 3D∞[Ag10Mg3]δ− polyanionic framework balanced by positively charged La atoms. 相似文献
16.
The first ternary compound in the Nb–Ni–Sb system, Nb28Ni33.5Sb12.5, has been synthesized and its structure has been determined by single-crystal X-ray diffraction methods. Nb28Ni33.5(2)Sb12.5(2) adopts the X-phase structure type (orthorhombic, space group Pnnm, Z=1, a=13.2334(5) Å, b=16.5065(7) Å, c=5.0337(2) Å), which belongs to the set of tetrahedrally close-packed (TCP) structures adopted by many intermetallic compounds. Typical of such TCP structures, the atoms reside in sites of high coordination number, with Ni and Sb in CN12 and Nb in CN14, -15, and -16 sites. The relative importance of various metal–metal bonding interactions is discussed on the basis of extended Hückel band structure calculations. Nb28Ni33.5Sb12.5 displays metallic behavior with a room-temperature resistivity of 2.3×10−4 Ω cm. 相似文献
17.
Rajia Ait Benhamou Aurlie Bessire Gilles Wallez Bruno Viana Mohamed Elaatmani Mohamed Daoud Abdelwahed Zegzouti 《Journal of solid state chemistry》2009,182(8):2319-2325
The double phosphate Ca9Eu(PO4)7, obtained by solid state reaction, was found to be isotypic with Ca3(PO4)2, with space group R3c and unit cell parameters a=10.4546(1) Å, c=37.4050(3) Å, V=3540.67(9) Å3, Z=6. The structure parameters refined using the Rietveld method showed that europium shares positions M1, M2 and M3 with calcium, contradicting previously published Mössbauer results. Low temperature luminescence under selective excitation of Eu3+ in Ca9Y1−xEux(PO4)7 and in Ca9Eu(PO4)7 samples was studied, confirming the Eu3+ distribution into these sites. At 10 K, 5D0→7F0 emission lines of Eu3+ were observed at 578.5, 579.5, 580.1 nm for the M3, M1 and M2 sites, respectively. High temperature X-ray powder diffraction evidenced a second-order phase transition around 573 °C. 相似文献
18.
Xiaoxiong Xu Zhaoyin Wen Zhonghua Gu Xiaohe Xu Zuxiang Lin 《Electrochemistry communications》2004,6(12):342
Li2O–Cr2O3–GeO2–P2O5 based glasses were synthesized by a conventional melt-quenching method and successfully converted into glass-ceramics through heat treatment. Experimental results of DTA, XRD, ac impedance techniques and FESEM indicated that Li1.4Cr0.4Ge1.6(PO4)3 glass-ceramics treated at 900 °C for 12 h in the Li1 + xCrxGe2 − x(PO4)3 (x = 0–0.8) system exhibited the best glass stability against crystallization and the highest ambient conductivity value of 6.81 × 10−4 S/cm with an activation energy as low as 26.9 kJ/mol. In addition, the Li1.4Cr0.4Ge1.6(PO4)3 glass-ceramics displayed good chemical stability against lithium metal at room temperature. The good thermal and chemical stability, excellent conducting property, easy preparation and low cost make it promising to be used as solid-state electrolytes for all-solid-state lithium batteries. 相似文献
19.
Hisanori Yamane Shinya Sasaki Shunichi Kubota Masahiko Shimada Takashi Kajiwara 《Journal of solid state chemistry》2003,170(2):265-272
Single crystals of new quaternary compounds Sr8Cu3In4N5 and Sr0.53Ba0.47CuN were prepared, respectively, from a Sr–Cu–In–Na melt under 7 MPa of N2 and from a Sr–Ba–Cu–In–Na melt under 0.5 MPa of N2 by slow cooling from 1023 to 823 K. The crystal structures were determined by single-crystal X-ray diffraction. Sr8Cu3In4N5 has an orthorhombic structure (space group, Immm, Z=2, a=3.8161(5) Å, b=12.437(2) Å, c=18.902(2) Å), and is isostructural with Ba8Cu3In4N5. It contains nitridocuprates of isolated units 0[CuN2] and one-dimensional linear chains ∝1[CuN2/2] and one-dimensional indium clusters ∝1[In2In2/2]. Sr0.53Ba0.47CuN crystallizes in an orthorhombic cell, space group Pbcm, Z=4, a=5.4763(7) Å, b=9.2274(12) Å, c=9.0772(12) Å. The structure contains infinite zig-zag chains ∝1[CuN2/2] which kink at every second nitrogen atom. 相似文献
20.
Julie L Shreeve-Keyer Robert C Haushalter Young-Sook Lee Sichu Li Charles J O'Connor Dong-Kyun Seo Myung-Hwan Whangbo 《Journal of solid state chemistry》1997,130(2):234-249
Exploratory synthesis in the K–In–Ge–As system has yielded the unusual layered compounds K8In8Ge5As17(1) and K5In5Ge5As14(2), both of which contain In–Ge–As layers with interleaved potassium ions, Ge–Ge bonds, InAs4tetrahedra, As–As bonds, and rows of Ge2As6dimers. Compound 1 has As3groups, while compound 2 has infinite As ribbons on both faces of each layer. Unlike compound 1, compound 2 has substitutional defects where indium partially occupies each of the three independent germanium sites in the ratio of 1:5 for In:Ge. This partial occupancy makes 2 an electron-precise compound. The Ge(In)–Ge(In) bond of 2 is longer than the Ge–Ge bond of 1, and this bond lengthening effect was confirmed by performing DFT-MO calculations on the model compounds H3Ge–GeH3and H3Ge–InH−3. Possible implications of electron imprecise formulas determined by X-ray crystal structure determinations are discussed. Compound 1: space groupP21/cwitha=18.394 (8) Å,b=19.087 (7) Å,c=25.360 (3) Å,β=105.71 (2)°,V=8571 (4) Å3, andDcalcd=4.45g/cm3forZ=4. Refinement on 4455 reflections yieldedR(Rw)=6.8%(7.8%). Compound 2: space groupC2/mwitha=40.00 (1) Å,b=3.925 (2) Å,c=10.299 (3),β=99.97 (2)°,V=1592 (1) Å3, andDcalcd= 4.55g/cm3forZ=8. Refinement on 1206 reflections yieldedR(Rw)=5.6% (5.7%). 相似文献