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1.
Syntheses, Crystal Structures, and Triple Twinning of the Cluster Trimers Bi2[PtBi6Br12]3 and Bi2[PtBi6I12]3 Melting reactions of Bi with Pt and BiX3 (X = Br, I) yield shiny black, air insensitive crystals of the subhalides Bi2[PtBi6X12]. Bi2[PtBi6Br12]3 crystallizes in the monoclinic space group C2/m with lattice parameters a = 1617.6(2) pm, b = 1488.5(1) pm, c = 1752.4(2) pm, and β = 110.85(4)°. Bi2[PtBi6I12]3 adopts the triclinic space group with pseudo‐monoclinic lattice parameters a = 1711.2(2) pm, b = 1585.1(1) pm, c = 1865.7(2) pm, and α = 90°, β = 111.15(4)°, γ = 90°. The two homoeotypic compounds consist of cuboctahedral [Pt?IIBiII6X?I12]2? clusters that are concatenated into linear trimers by BiIII atoms. The ordered distribution of BiIII atoms destroys the inherent threefold rotation axes in the packing of cluster anions. As a consequence of the pseudosymmetry the crystals are triple twinned along [201]. Due to different orientations of the cluster trimers there are two BiII···X inter‐cluster bridges per BiII atom in Bi2[PtBi6Br12]3 but only one bridge in Bi2[PtBi6I12]3. The structure of the iodine compound can be deduced from the NaCl structure type, leaving 37 of 96 atomic positions unoccupied. The arrangement of the cuboctahedral clusters follows the motif of a body‐centered cubic packing. 相似文献
2.
Michael Ruck 《无机化学与普通化学杂志》2000,626(1):14-22
The Cluster Salts Bi14Si2MI12 (M = Rh, Ir): [Bi8Si2] and [MBi6I12] Building Groups in CsCl‐like Structure The reaction of bismuth and iridium with iodine in evacuated quartz ampoules at 1320 K yields black, air insensitive crystals of Bi14Si2IrI12. The silicon therein is abstracted from the ampoule material whereby the oxygen is gettered in BiOI. The synthesis of Bi14Si2RhI12 requires the addition of niobium, which gives NbOI2 with the oxygen originating from the SiO2. X‐ray diffraction on single crystals showed that the two isotypic compounds crystallize in the space groups P 4/m c c with a = 1018.3(1), c = 2020.1(4) pm for M = Ir, and a = 1019.0(1), c = 2018.7(4) pm for M = Rh. The crystal structures consist of two types of isolated clusters, which form a CsCl‐like packing. In the [MBi6I12] cuboctahedron the central transition metal atom is octahedrally surrounded by bismuth atoms, and the iodine atoms bridge the edges of the octahedron. The [Bi8Si2] polyhedron is a tetragonal antiprism of bismuth atoms of which square faces are capped by silicon atoms. Based on crystal chemistry and band structure calculations the compounds may be formulated as cluster salts [Bi8Si2]3+[MBi6I12]3–. Measurements of the electrical conductivity showed that Bi14Si2IrI12 is a semiconductor with a band gap of about 0.1 eV. A single unpaired electron out of 1903 electrons per formula causes paramagnetic behaviour that is superposed by strong diamagnetic contributions. 相似文献
3.
Selenium Polycations Stabilized by Polymeric Chlorobismuthate Anions: Syntheses and Crystal Structures of Se4[Bi4Cl14] and Se10[Bi5Cl17] Reactions of selenium with selenium(IV) chloride and bismuth(III) chloride in sealed evacuated glass ampoules at temperatures between 110 and 155 °C yield a series of compounds which are composed of discrete selenium polycations and polymeric chlorobismutate anions. Besides the already known Se8[Bi4Cl14] two new compounds have been identified by crystal structure analyses as Se4[Bi4Cl14] (tetragonal, P4/n, a = 1089.1(2) pm, c = 993.7(2) pm, Z = 2) and Se10[Bi5Cl17] (monoclinic, P21/c, a = 1079.24(8) pm, b = 2062.9(2) pm, c = 1676.1(2) pm, β = 90.87(1)°, Z = 4). Se4[Bi4Cl14] was obtained as red transparent platelike crystals and is the first example of a compound with (chalcogen4)2+ ions of exact square‐planar symmetry and molecular point group D4h in the solid state. The cations are surrounded by layers of two‐dimensional polymeric anions [Bi4Cl14]2–. Se10[Bi5Cl17] forms dark grey crystals with a reddish luster. The structure contains the known bicyclic polycation Se102+ which is disordered over two positions and the first three‐dimensional polymeric chlorobismutate anion [Bi5Cl17]2–. The different BiClx polyhedra are linked by sharing common vertices, edges, and faces. 相似文献
4.
Bi53+ Polycations in Ordered and Plastic Crystals of Bi5[AlI4]3 and Bi5[AlBr4]3 Dark‐red air‐sensitive crystals of pentabismuth‐tris(tetrabromoaluminate) Bi5[AlBr4]3 and black crystals of Bi5[AlI4]3 have been crystallized from melts of Bi, BiX3 and AlX3 (X = Br, I). X‐ray diffraction on a single crystal of Bi5[AlI4]3 (T = 293(2) K; space group Pnma; a = 2143.6(3) pm, b = 1889.1(1) pm, c = 811.74(5) pm) revealed an ordered packing of Bi53+ trigonal bipyramids and [AlI4]? tetrahedra that corresponds to the PuBr3 structure type. Contrary to the so far known Bi53+ polycations with accurate D3h symmetry, the bismuth cluster found in Bi5[AlI4]3 holds only Cs symmetry. The room temperature structure of the tetrabromoaluminate Bi5[AlBr4]3, which is related to the AuCu3 type, shows a dynamic disorder of the Bi53+ polycations (T = 293(2) K; space group ; a = 1766.2(3) pm). Slight cooling induces the transition into an ordered rhombohedral phase isostructural to Bi5[AlCl4]3 (T = 260(2) K; space group a = 1241.5(8) pm, c = 3041(2) pm). 相似文献
5.
Synthesis and Crystal Structures of Bismuth Chalcogenolato Compounds Bi(SC6H5)3, Bi(SeC6H5)3, and Bi(S‐4‐CH3C6H4)3 Bismuth(III) acetate reacts with thiophenol in ethyl alcohol at 80 °C to yield Bi(SC6H5)3 ( 1 ). Slow cool down of the deep yellow mixture lead to the formation of orange crystals of 1 . The homotype phenylselenolato compound of bismuth Bi(SeC6H5)3 ( 2 ) has been prepared by the reaction of BiX3 (X = Cl, Br) with Se(C6H5)SiMe3 in diethyl ether. In the same way as Bi(SC6H5)3 ( 1 ) the reaction between bismuth(III) acetate and 4‐tolulenethiole results in red crystals of Bi(S‐4‐CH3C6H4)3 ( 3 ). In consideration of three longer Bi–E distances (intermolecular interactions, E = S; Se) the Bi(EPh)3 molecules form via face‐linked octahedra 1‐dimensional chains in the crystal lattice, while for 3 the 1‐dimensional chain is formed by face‐linked trigonal prisma. We reported herein the synthesis and structures of Bi(SC6H5)3 ( 1 ), Bi(SeC6H5)3 ( 2 ), and Bi(S‐4‐CH3C6H4)3 ( 3 ). 相似文献
6.
Bi37InBr48: a Polar Subhalide with Bi95+ Polycations, Complex Bromobismuthate(III) Anions [Bi3Br13]4— and [Bi7Br30]9—, and Pentabromoindate(III) Anions [InBr5]2— Black crystals of Bi37InBr48 were synthesized from bismuth, indium and BiBr3 by cooling stoichiometric melts from 570 K to 470 K. X‐ray diffraction on powders and single‐crystals revealed that the compound crystallizes with space group P 63 (a = 2262.6(4); c = 1305.6(2) pm). The Bi95+ polycations in the polar crystal structure have the shape of heavily distorted tri‐capped trigonal prisms with approximate Cs symmetry. The high complexity of the structure results from three coexisting types of anionic groups: Three edge‐sharing [BiBr6] octahedra constitute the trigonal bromobismuthate(III) anion [Bi3Br13]4—. Four [BiBr6] and three [BiBr5] polyhedra share common vertices to form the [Bi7Br30]9— hemi‐sphere, in which the trigonal bipyramid of the pentabromoindat(III) ion [InBr5]2— is embedded. 相似文献
7.
Syntheses and Crystal Structure Analyses of [SbI3(SbMe3)(THF)]2 and [Li(THF)4]2[Bi2Cl8(THF)2] The reaction of Me3Sb with SbI3 in tetrahydrofuran (THF) gives [SbI3(SbMe3)(THF)]2 ( 1 ). [Li(THF)4]2[Bi2Cl8(THF)2] ( 2 ) is formed by reaction of LiCl and BiCl3 in tetrahydrofuran. The structures of ( 1 ) and ( 2 ) have been determined by X-ray diffractometry. Both structures contain centrosymmetric dimers with the geometry of edge sharing octahedra. 相似文献
8.
The reaction of platinum(II) chloride with 1,2,4‐trichlorobenzene gives the novel platinum complex Pt6Cl12·(1,2,4‐C6H3Cl3). It is the first example of an cocrystallization product of platinum(II) chloride and organic molecules whose crystal structure has been established. 相似文献
9.
Michael Ruck 《无机化学与普通化学杂志》2002,628(7):1537-1540
Synthesis and Crystal Structures of the Quaternary Chalcogenide Chlorides AgBi2S3Cl and AgBi2Se3Cl Grey crystals of AgBi2S3Cl and AgBi2Se3Cl were synthesized from AgCl and Bi2S3 or Bi2Se3by cooling stoichiometric melts from 790 K to room temperature. X‐ray diffraction on powders and single‐crystals revealed that the compounds crystallize isostructural with space group type P 21/m. In the crystal structure of AgBi2S3Cl the bismuth(III) cations have a capped trigonal prismatic coordination of sulfide and chloride ions. The prisms constitute a three‐dimensional framework by sharing common edges and faces. Silver(I) cations, which have a distorted octahedral coordination of sulfide ions, fill linear channels. Parallels to the crystal structures of Cu3Bi2S4Cl and Pr2Br5 can be seen. 相似文献
10.
Syntheses and Crystal Structures of Chalcogenido‐bridged Nickel Cluster Compounds [Ni5Se4Cl2(PPhEt2)6], [Ni12Se12(PnPr3)6], and [Ni18S18(PiPr3)6] The reaction of (R)ESiMe3 (R = SiMe3, Mes = C9H11; E = S, Se) with [NiCl2(PPhEt2)2] and [NiCl2(PR3)2] (R = nPr, iPr) gives new chalcogenido‐bridged nickel cluster compounds [Ni5Se4Cl2(PPhEt2)6]·2THF ( 1 ), [Ni12Se12(PnPr3)6]·2THF ( 2 ), and [Ni18S18(PiPr3)6]·2THF ( 3 ). The structures of these compounds were determined by single crystal X‐ray structural analyses. 相似文献
11.
Alkali Metal Phosphoraneiminates. New Syntheses and Crystal Structures of [RbNPPh3]6 and [CsNPPh3]4 The alkali‐metal phosphoraneiminates MNPPh3 with M = Na, K, Rb, Cs have been synthesized by reactions of Ph3PI2 with the alkali‐metal amides in liquid ammonia and were obtained as pure samples by subsequent extraction with toluene. The ethyl derivative KNPEt3 has been prepared by an analogous route from Et3PBr2 and extraction with hexane. Single crystals of the phosphoraneiminates of rubidium and cesium are obtainable by crystallization from toluene and toluene/hexane, respectively. They were suitable for crystal structure determinations. [RbNPPh3]6 · 41/2 toluene ( 1 ): space group P1, Z = 2, lattice dimensions at 193 K: a = 1525.5(2); b = 1902.9(2); c = 2178.3(2) pm; α = 95.435(12)°; β = 91.145(12)°; γ = 90.448(12)°; R1 = 0.0529. The compound forms a Rb6N6 skeleton of a double cube with a common face of two rubidium and two nitrogen atoms, the latter being fivefold coordinated by four rubidium atoms and the phosphorus atom. [CsNPPh3]4 · 2 toluene · 33/4 hexane ( 2 a ): space group Fd3, Z = 8, lattice dimensions at 123 K: a = b = c = 2679.7(1) pm; R1 = 0.0405. [CsNPPh3]4 · 2 toluene ( 2 b ): space group P21/n, Z = 4, lattice dimensions at 193 K: a = 1418.9(1); b = 2258.9(1); c = 2497.6(1) pm; β = 91.055(6)°; R1 = 0.0278. Both cesium compounds form Cs4N4 heterocubane structures which are different by means of the packing and by different bond angles at the cesium and nitrogen atoms. 相似文献
12.
The viability of Lewis‐acid ionic liquids for the synthesis of low‐valent bismuth compounds is demonstrated. At room temperature, elemental bismuth and bismuth(III) cations synproportionate in the ionic liquid [BMIM]Cl/AlCl3 ([BMIM]+: 1‐n‐butyl‐3‐methylimidazolium) within minutes. The existence of bismuth polycations in the dark colored solution was proven by Raman spectroscopy. Dark‐red crystals of Bi5(AlCl4)3 were isolated from the ionic liquid and characterized by Raman spectroscopy and X‐ray crystallography (rhombohedral space‐group , a = 1187.1(2) pm, c = 3012.0(3) pm). The method allows the synthesis of bismuth cluster compounds under milder conditions than in high‐temperature melts and more conveniently and environmental friendly than in liquid SO2 with strongly oxidizing, toxic agents like SbF5 or AsF5. 相似文献
13.
The intermetalloid clusters [M2Bi12]4+ (M = Ni, Rh) were synthesized as halogenido‐aluminates in Lewis‐acidic ionic liquids. The reaction of bismuth and NiCl2 in [BMIm]Cl · 5AlCl3 (BMIm = 1‐butyl‐3‐methylimidazolium) at 180 °C yielded black, triclinic (P1 ) crystals of [Ni2Bi12][AlCl4]3[Al2Cl7]. Black, monoclinic (P21/m) crystals of [Rh2Bi12][AlBr4]4 precipitated after dissolving the cluster salt Bi12–xRhX13–x (X = Cl, Br; 0 < x < 1) in [BMIm]Br·4.1AlBr3 at 140 °C. In the cationic cluster [Ni2Bi12]4+, the nickel atoms center two base‐sharing square antiprisms of bismuth atoms (symmetry close to D4h). The valence‐electron‐poorer rhodium‐containing cluster is a distorted variant of this motif: the terminating Bi4 rings are folded to bicyclic “butterflies“ and the central square splits into two dumbbells (symmetry close to D2h). DFT‐based calculations and real‐space bonding analyses place the intermetalloid units between a triple‐decker complex and a conjoined Wade‐Mingos cluster. 相似文献
14.
Syntheses and Crystal Structures of Cu and Ag Complexes with [Ta6S17]4— Ions as Ligands In the presence of phosphines saturated solutions of the thiotantalates (NEt4)4[(Ta6S17)] · 3MeCN react with copper or silver salts to give new heterobimetallic Ta—M—S clusters (M = Ag, Cu). These clusters contain the intact cluster core of the [Ta6S17]4— anion. Compounds [Cu(PMe3)4]3[(Ta6S17)Cu(PMe3)] · 2MeCN ( 1 ), (NEt4)[(Ta6S17)Ag3(PMe2iPr)6] · 5MeCN ( 2 ), [(Ta6S17)Cu4 (PMe2iPr)8] · MeCN ( 3 ), [(Ta6S17)Cu5Cl(PMe2iPr)9] · MeCN ( 4 ) and [Ta2Cu2S4Cl2(PMe2iPr)6] · 2MeCN ( 5 ) are presented herein. The structures of these compounds were elucidated by single crystal X‐ray structural analyses. 相似文献
15.
Crystal Structures of the Azido Platinates (AsPh4)2[Pt(N3)4] and (AsPh4)2[Pt(N3)6] The crystal structures of the two homoleptic azido platinates (AsPh4)2[Pt(N3)4] ( 1 ) and (AsPh4)2[Pt(N3)6] ( 2 ) were determined by X‐ray diffraction at single crystals. In 1 the [Pt(N3)4]2– ions are without crystallographic site‐symmetry, and the platinum atoms show a planar surrounding. The [Pt(N3)6]2– ions in 2 are centrosymmetric (Ci) with an octahedral surrounding at the platinum atoms. While 1 is highly explosive, 2 is of significantly greater stability. This behaviour is explained by the packing conditions. 1 : Space group P21/n, Z = 6, lattice dimensions at –80 °C: a = 1045.3(1), b = 1620.2(1), c = 4041.0(3) pm; β = 96.70(1)°; R1 = 0.0654. 2 : Space group P1, Z = 1, lattice dimenstions at –80 °C: a = 1027.6(1), b = 1049.1(2), c = 1249.9(3) pm; α = 88.27(1)°, β = 74.13(1)°, γ = 67.90(1)°; R1 = 0.0417. 相似文献
16.
Syntheses and Crystal Structures of [Pd9As8(PPh2)8] and [Pd9Sb6(PPh3)8] [PdCl2(PPh3)2] reacts with As(SiMe3)3 to give the new cluster [Pd9As8(PPh3)8] ( 4 ). 4 has been characterized by X-ray crystal structure analysis. It is a molecule in which four [Pd2(PPh3)2]-units are bridged by As2-units. A further Pd atom is located in the centre of the cluster. 4 crystallizes in the space group C2/c with four formula units per unit cell. The lattice constants at 200 K are: a = 3 970.6(3), b = 1 648.90(16), c = 3 266.30(20) pm, β = 131,44(4)°. The reaction of [PdCl2(PPh3)2] with Sb(SiMe3)3 yields [Pd9Sb6(PPh3)8] ( 5 ). 5 consists of a body centred cubic Pd9-cluster. All of the cube faces are capped by μ4-Sb-ligands. 5 crystallizes in the space group Pn3 with two formula units per unit cell. The lattice constants at 200 K are: a = b = c = 1 995.4(2) pm. 相似文献
17.
Simone Dill Jochen Glaser Markus Strbele Sonja Tragl H.‐Jürgen Meyer 《无机化学与普通化学杂志》2004,630(7):987-992
Beyond the Conventional Number of Electrons in M6X12 Type Metal Halide Clusters: W6Cl18, (Me4N)2[W6Cl18], and Cs2[W6Cl18] Black octahedral single crystals of W6Cl18 were obtained by reducing WCl4 with graphite in a silica tube at 600 °C. The single crystal structure refinement (space group R 3¯, Z = 3, a = b = 1498.9(1) pm, c = 845.47(5) pm) yielded the W6Cl18 structure, already reported on the basis of X‐ray powder data. (Me4N)2[W6Cl18] and Cs2[W6Cl18] were obtained from methanolic solutions of W6Cl18 with Me4NCl and CsCl, respectively. The structure of (Me4N)2[W6Cl18] was refined from X‐ray single crystal data (space group P 3¯m1, Z = 1, a = b = 1079.3(1) pm, c = 857.81(7) pm), and the structure of Cs2[W6Cl18] was refined from X‐ray powder data (space group P 3¯, Z = 1, a = b = 932.10(7) pm, c = 853.02(6) pm). The crystal structure of W6Cl18 contains molecular W6Cl18 units arranged as in a cubic closest packing. The structures of (Me4N)2[W6Cl18] and Cs2[W6Cl18] can be considered as derivatives of the W6Cl18 structure in which 2/3 of the W6Cl18 molecules are substituted by Me4N+ ions and Cs+ ions, respectively. The conventional number of 16 electrons/cluster is exceeded in these compounds, with 18 electrons for W6Cl18 and 20 electrons for (Me4N)2[W6Cl18] and Cs2[W6Cl18]. Cs2[W6Cl18] exhibits temperature independent paramagnetic behaviour. 相似文献
18.
Novel Gold Selenium Complexes: Syntheses and Structures of [Au10Se4(dpppe)4]Br2, [Au2Se(dppbe)]∞, [(Au3Se)2(dppbp)3]Cl2, and [Au34Se14(tpep)6(tpepSe)2]Cl6 The reaction of gold phosphine complexes [(AuX)(PR3)] (X= halogen; R = org. group) with Se(SiMe3)2 yield to new chalcogeno bridged gold complexes. Especially within the use of polydentate phosphine ligands cluster complexes like [Au10Se4(dpppe)4]Br2 ( 1 ) (dpppe = 1, 5‐Bis(diphenylphosphino)pentane), [Au2Se(dppbe)]∞ ( 2 ) (1, 4‐Bis(diphenylphosphino)benzene), [(Au3Se)2(dppbp)3]Cl2 ( 3 ) (dppbp = 4, 4′‐Bis‐diphenylphosphino)biphenyl) und [Au34Se14(tpep)6(tpepSe)2]Cl6 ( 4 ) (tpep = 1, 1, 1‐Tris(diphenylphosphinoethyl)phosphine, tpepSe = 1, 1‐Bis(diphenylphosphinoethyl)‐1‐(diphenylselenophosphinoethylphosphine) could be isolated and their structures could be determined by X‐ray diffraction. ( 1: Space group P1 (No. 2), Z = 2, a = 1642.1(11), b = 1713.0(9), c = 2554.0(16) pm, α = 80.41(3)°, β = 76.80(4)°, γ = 80.92(4)°; 2: Space group P21/n (No. 14), Z = 4, a = 947.3(2), b = 1494.9(3), c = 2179.6(7) pm, β = 99.99(3)°; 3: Space group P21/c (No. 14), Z = 8, a = 2939.9(6), b = 3068.4(6), c = 3114.5(6) pm, β = 109.64(3)°; 4: Space group P1 (No. 2), Z = 1, a = 2013.7(4), b = 2420.6(5), c = 2462.5(5) pm, α = 77.20(3), β = 74.92(3), γ = 87.80(3)°). 相似文献
19.
Phosphoraneiminato Complexes of Bismuth(III). Crystal Structures of [BiF2(NPEt3)(HNPEt3)]2 and [Bi2I(NPPh3)4]I3 [BiF2(NPEt3)(HNPEt3)]2 ( 1 ) has been obtained by the reaction of BiF3 with Me3SiNPEt3 at 100 °C and subsequent extraction with 1,2‐dimethoxyethane in the presence of traces of water forming pale‐yellow, moisture sensitive crystals, which were characterized by a crystal structure determination. Space group P21/n, Z = 4, lattice dimensions at –83 °C: a = 2105.0, b = 1195.8, c = 728.2 pm, β = 92.55°. 1 forms centrosymmetric dimeric molecules, in which the Bi atoms are linked via Bi–N bonds of varying length (213.9 and 240.1 pm) of the NPEt3– groups to form a Bi2N2 four‐membered ring. The longer one of the two Bi–N bonds is trans to one terminal F atom. [Bi2I(NPPh3)4]I3 ( 2 ) has been obtained by the reaction of bismuth with N‐iodine triphenylphosphaneimine in dichloromethane forming red crystals. Crystal structure determination of 2 · 2.5 CH2Cl2: Space group P21/n, Z = 4, lattice dimensions at –50 °C: a = 1542.6, b = 2409.1, c = 2173.5 pm, β = 105.82°. In 2 the Bi atoms are linked via two N atoms of two NPPh3– groups to form a non‐planar Bi2N2 four‐membered ring with a fold angle of 27° along the N…N connection line. The two remaining NPPh3– groups are terminally connected and bent in the same direction. The iodide ion caps the two Bi atoms so that a [Bi2I(NPPh3)4]+ cation is formed. 相似文献
20.
Phosphoraneiminato Acetate Cluster of Copper and Zinc. Crystal Structures of [Cu4(NPEt3)2(O2CCH3)6] and [Zn4(NPEt3)2(O2CCH3)6] The anhydrous acetates of copper(II) and zinc react with the silylated phosphaneimine Me3SiNPEt3 in dichloromethane at 20 °C forming the mixed phosphoraneiminato acetate clusters [Cu4(NPEt3)2(O2CCH3)6] ( 1 ), which forms emerald crystals, and colourless [Zn4(NPEt3)2 · (O2CCH3)6] ( 2 ). In spite of analogous composition the structures of 1 and 2 are completely different. In the asymmetric unit of 1 three copper atoms of an almost isosceles triangle are linked via two nitrogen atoms of the NPEt3– groups to form a trigonal bipyramidal aggregate. One of these three copper atoms is chelated by an acetate group, another one is connected with the fourth copper atom via three μ2‐O2C–CH3 groups. The asymmetric units are associated via a μ2‐O2C–CH3 group and a μ3‐OC(O)CH3 group at a time so that infinite chains result. In 2 two zinc atoms are linked via the nitrogen atoms of the two NPEt3– groups to form an almost centrosymmetric four‐membered ring. Both nitrogen atoms of the four‐membered ring are connected with another zinc atom each. These zinc atoms again are linked with the zinc atoms of the Zn2N2 four‐membered ring via two μ2‐O2C–CH3 groups each and additionally coordinated with a terminal acetate ligand each. 相似文献