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1.
《结构化学》2016,(6)
Reactions of Sn powder, cadmium iodide, rubidium carbonate, and sodium sulfide yielded two new compounds: three-dimensional chalcogenide Rb Na_3Cd_2Sn_2S_8(1) and layered ternary compound Na_2CdS_2(2). 1 and 2 have been determined by single-crystal X-ray diffraction: 1 belongs to the orthorhombic space group Pca21, with a = 13.486(3), b = 6.7310(14), c = 18.401(4) ? and Z = 4; 2 crystallizes in the R 3 m space group, with a = 3.718(3), c = 26.170(4) ? and Z = 3. Study of the yellow block shaped crystals of 1 reveals that the structure consists of tetrahedral CdS_4 and SnS_4. The {Cd_2Sn_2S_8} cluster shows a 12-numbered ring structure assembled by corner-sharing of alternating SnS_4 and CdS_4, and the rubidium and sodium ions act as void-filling and charge compensating cations. The dark orange hexagonal crystal of compound 2 consists of a unique 1$[CdS_2]~(2-) layer, which are separated by the Na+. UV/Vis absorption spectrum exhibits the materials 1 and 2 have semiconductor properties. 相似文献
2.
LI Jian-Rong LIN Ping LI Zhi-Hua DU Shao-Wu 《结构化学》2009,28(11):1475-1479
The self-assembly reactions of [MOS3]^2- (M = W, Mo) with CuS2COCH3 in DMF produced two novel dodecanuclear Mo(W)/Cu/S heterometallic clusters, [Et4N]4[{MOS3}3Cu6S2- (CuS2COCH3)3]·H2O (1: M = W; 2: M = Mo). Cluster 1 crystallizes in hexagonal, space group P-62c with a = 16.5612(3), b = 16.5612(3), c = 16.4660(5)A, Z = 2, V = 3911.13(16)A^3, Dc = 1.935 g/cm^3, μ(MoKα) = 7.269 mm^-1, F(000) = 2192, the final R = 0.0289 and wR = 0.0789 for 2425 observed reflections (I 〉 2σ(I)). Cluster 2 is isomorphous to 1 with similar crystal parameters. X-ray analysis reveals that both clusters consist of three incomplete cubane-like cluster units {MOS3Cu3S2COCH3}, which are linked together by two μ3-S atoms. 相似文献
3.
《结构化学》2021,40(7)
A new quaternary selenide Ba|_4Sn_3GeSe_9 was synthesized by high temperature solid state reaction method and fully characterized by elemental analysis, UV-vis spectrum, and single-crystal X-ray diffraction. The title compound crystallizes in the orthorhombic space group Pnma with a = 12.463(3), b = 9.308(2) and c = 17.892(5) ?. Ba|_4Sn_3GeSe_9 can be characterized by a zero-dimensional compound composed by special [GeSnSe_5]~(4-) units, [Sn_2Se_4]~(4-) units and the adjacent cations Ba~(2+) ions. The [GeSn Se5]4-unit is composed of a SnSe_3 trigonal pyramid formed by divalent Sn~(2+) and edge-sharing with a GeSe_4 tetrahedron, and the [Sn_2Se_4]-unit is composed of two Sn Se_3 trigonal pyramids. Ba|_4Sn_3GeSe_9 is an indirect semiconductor with a band gap of 1.21 eV. 相似文献
4.
《结构化学》2009,28(11)
Two new cobalt(Ⅱ) supramolecular complexes [Co(4,4'-bipy)_2(H_2O) _4]·[Co_2(4,4'-bipy)3-(H_2O) _8]·2TST-2(4,4'-bipy)·4H_2O 1 and [Co(4,4'-bipy) _2(H_2O) _4]DSNT·4,4'-bipy 2 based upon the assembly of Co(Ⅱ), 4,4'-bipyridine (4,4'-bipy) and two new multifunctional organic ligands, 2,4,6-tris(4-sulfophenyl-amino)-1,3,5-triazine (H_3TST) and 2,4-bis(p-sulfanilato)-6-diethylamino-1,3,5-triazine (H_2DSNT), have been prepared by hydrothermal method and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal structure of 1 is of monoclinic, space group P2_(1/n) with α= 13.599(4), b = 18.988(6), c = 22.995(7) A, β = 90.273(6)°, V= 5938(3) A~3, Z = 4, C_(56)H_(59)CO_(1.5)N_(13)O_(17)S_3, M_r = 1370.74, D_c = 1.533 g/cm~3,μ = 0.613 mm~(-1), F(000) = 2842, GOOF = 1.018, the final R = 0.0796 and wR = 0.1498 for 9019 observed reflections with I > 2o(I). The crystal structure of 2 belongs to the monoclinic system, space group C2/c with α = 18.864(6), b = 14.283(5), c = 20.246(7) A, β = 107.799(6)°, V = 5194(3) A~3, Z = 4, C_(49)H_(52)CoN_(12)O_(10)S_2, M_r = 1092.08, D_c = 1.397 g/cm~3, μ= 0.480 mm~(-1), F(000) = 2276, GOOF = 1.059, the final R = 0.0665 and wR = 0.1900 for 4887 observed reflections with I> 2σ(I). The results of X-ray crystal structure analysis revealed that complexes 1 and 2 exhibit layered supramolecular frameworks stabilized by electrostatic interactions, π-π interactions and hydrogen bonds. 相似文献
5.
6.
Two new one-dimensional chain-like coordination polymers,[Cu(H2O)(dpa)- MoO4]·H2O 1 and [Co(H2O)(dpa)MoO4] 2,have been synthesized under hydrothermal reactions. Their structures were determined by single-crystal X-ray diffraction analysis. Crystal data for 1: [Cu(H2O)(dpa)MoO4]·H2O,Mr = 430.71,monoclinic,space group P21/c,a = 9.5469(10),b = 16.6874(17),c = 9.0799(10)A,β = 104.9100(10)°,V = 1397.8(3)A^3,Z = 4,Dc = 2.047 g/cm^3,F(000) = 852,μ = 2.449 mm-1,the final R = 0.0293 and wR = 0.0638 for 2472 independent reflections (Rint = 0.0338) and 2034 observed reflections with I 〉 2σ(I). Crystal data for 2: [Co- (H2O)(dpa)MoO4],Mr = 408.09,monoclinic,space group P21/c,a = 10.204(2),b = 18.933(4),c = 6.8875(16)A,β = 102.195(3)o,Z = 4,V = 1300.5(5)A^3,Z = 4,Dc = 2.084 g/cm3,F(000) = 804,μ = 2.262 mm-1,the final R = 0.0357 and wR = 0.0693 for 3022 independent reflections (Rint = 0.0436) and 2286 observed reflections (I 〉 2σ(I)). Polymer 1 is based on a one-dimensional zigzag chain built up from {Cu(H2O)(dpa)}2+ units bridged through the bidentate {MoO4}2- ligands. The chains extending along the c-axis are arranged alternately with two opposite orientations along the b-axis. The adjacent chains are stably packed together through π-π interactions and exhibit an interesting three-dimensional supramolecular architecture via hydrogen bonding interactions. Polymer 2 based on a one-dimensional zonal chain is built up from {Co(H2O)(dpa)}2+ units linked by the tridentate {MoO4}2- ligands. The ribbons extend along the c-axis. In the bc layers,there are significant interactions of N-H…O-Mo hydrogen bonds and π-π overlaps of dpa ligands between adjacent ribbons. 相似文献
7.
Three novel metal-organic complexes with formulas [Ni(C9N2O2H7)2(CH3OH)2](1),[Zn(C9N2O2H7)2(H2O)2](2) and [Cd(C9N2O2H7)2(CH3OH)2](3) were synthesized by the reactions of Ni,Zn and Cd salts with ethyl 2-benzimidazolylacetate under hydrothermal conditions or layering technique,and characterized by single-crystal X-ray diffraction analysis,IR spec-troscopy,solid-state luminescent properties and thermogravimetric(TG) analysis.The crystal data for these three complexes are as follows:for 1,monoclinic,space group P21/c,a = 9.384(3),b = 9.634(3),c = 11.292(3) ,β = 95.787(5)°,V = 1015.7(5) 3,Z = 2,F(000) = 492,Dc = 1.547 Kg/m3,μ = 1.002 mm-1,the final R = 0.0451 and wR = 0.0900 for 1833 observed reflections with Ⅰ 2σ(Ⅰ);for 2,orthorhombic,space group Pbca,a = 10.031(4),b = 10.379(4),c = 17.525(7),V = 1824.6(12) 3,Z = 4,F(000) = 928,Dc = 1.645 Kg/m3,μ = 1.392 mm-1,the final R = 0.0452 and wR = 0.0996 for 1661 observed reflections with Ⅰ 2σ(Ⅰ);for 3,monoclinic,space group P21/c,a = 9.9114(13),b =10.4852(15),c = 10.4120(14) ,β = 108.453(5)°,V = 1026.4(2) 3,Z = 2,F(000) = 532,Dc = 1.705 Kg/m3,μ = 1.110 mm-1,the final R = 0.0322 and wR = 0.0805 for 1822 observed reflections with Ⅰ 2σ(Ⅰ).In the three complexes,the ethyl 2-benzimidazolylacetate shows the same chelating mode,and the adjacent units are interlinked into a two-dimensional layer through hydrogen-bonds(O-H···O,N-H···O). 相似文献
8.
以1,10-邻菲咯啉为原料,经氧化反应合成了1,10-邻菲咯啉-5,6-二酮(1);1与对氟苯甲醛反应合成了2-苯基(4-氟)-咪唑[4,5]-1,10-邻啡咯啉(2).1和2的结构经1H NMR,MS和X-射线单晶衍射表征.1为正交晶系,Pna21空间群,晶胞参数为:a=14.329 0(4)(A),b=12.370 0(3)(A),c=6.395 6(16)(A),α=90°,β=90°,γ=90°,V=1 133.5(5)(A)~3,Z=14,Dc=2.521 g·cm~(-3),μ=12.430 mm~(-1),F(000)=789,最终偏离因子R=0.039 8,wR=0.114 7.2为单斜晶系,P21/n,空间群晶胞参数为:a=9.810 0(4)(A),b=10.951 0(4)(A),c=17.3670(7)(A),α=90.000°,β=99.042(5)°,γ=90.000°,V=1 842.5(12)(A)~3,Z=4,Dc=1.292 g·cm~(-3),μ=0.095mm~(-1),F(000)=732,最终偏离因子R=0.091 2,wR=0.334 9. 相似文献
9.
The title compound mesityl acetic acid 3-mesityl-2-oxo-1-oxaspiro[4,4]non-3-en-4-yl ester (5, C28H32O4, Mr = 432.56), as a spiromesifen derivative, has been synthesized by the conden- sation reaction of 2,4,6-trimethylphenylacetic chloride with 4-hydroxyl-3-mesityl-1-oxa-spiro[4,4]- non-3-en-2-one (4), and its crystal structure was determined by single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 7.9261(7), b = 8.2802(8), c = 18.7604(18) , α = 91.576(3), β = 93.277(2), γ = 95.306(12)o, V = 1223.3(2) 3, Z = 2, Dc = 1.174 g/cm3, F(000) = 464, μ = 0.077 mm-1, S = 1.001, the final R = 0.0624 and wR = 0.1415 for 2809 observed reflections with I 2σ(I) and 290 variable parameters. The crystal analysis results show that the five-membered cyclopentyl ring displays an envelope conformation with C(25) atom at the flap position, 0.537(3) out of the mean plane formed by the other four atoms. The dihedral angles between the two benzene and furan rings are 70.0(2) and 80.67(3)o, respectively. 相似文献
10.
<正> The title compounds were prepared from the reation of (NH4)2MS4 (M=W,Mo),AgNO3,NadtcEt2 and Et4NBr in CH3CN-H2O solution. The isomorphous compounds [Bu4N]2[W2Ag3S8Et2du] ( I ) and [Bu4N]2[Mo2Ag3S8Et2dtc] (Ⅱ) crystallize in triclinic space qroup Pi with the following crystal parameters:α=13. 043(4),b = 21. 640(6),c=10. 757(6)A ,α=95. 09(5),β = 91. 90(4),γ = 98. 57(3)°,Z = 2,V = 2987A3,Dc=1. 76g/cm3 for I 5;a= 12. 989(2) ,b=21. 574 (9) ,c= 10. 7/1(1) A .α= 95. 06(7), β=91. 61(4), γ=98. 52(2)°, Z = 2,V = 2961 A3.Dc= 1. 58g/cm3 for Ⅱ . The final R and Rw values are 0. 061 and 0. 072 for Ⅰ ,and 0. 062 and 0. 076 for Ⅱ The M2Ag3 (M = W, Mo) unit in anion M2Ag3S8Et2dtc forms a five-membered ring. 相似文献
11.
Four new quaternary alkali neodymium thiophosphates K 9Nd[PS 4] 4 ( 1), K 3Nd[PS 4] 2 ( 2), Cs 3Nd[PS 4] 2 ( 3), and K 3Nd 3[PS 4] 4 ( 4) were synthesized by reacting Nd with in situ formed fluxes of K 2S 3 or Cs 2S 3, P 2S 5 and S in appropriate molar ratios at 973 K. Their crystal structures are determined by single crystal X-ray diffraction. Crystal data: 1: space group C2/ c, a = 20.1894(16), b = 9.7679(5), c = 17.4930(15) A, beta = 115.66(1) degrees , and Z = 4; 2: space group P2 1/ c, a = 9.1799(7), b = 16.8797(12), c = 9.4828(7) A, beta = 90.20(1) degrees , and Z = 4; 3: space group P2 1/ n, a = 15.3641(13), b = 6.8865(4), c = 15.3902(13) A, beta = 99.19(1) degrees , and Z = 4; 4: space group C2/ c, a = 16.1496(14), b = 11.6357(7), c = 14.6784(11) A, beta = 90.40(1) degrees , and Z = 4. The structure of 1 is composed of one-dimensional (1) infinity{Nd[PS 4] 4} (9-) chains and charge balancing K (+) ions. Within the chains, eight-coordinated Nd (3+) ions, which are mixed with K (+) ions, are connected by [PS 4] (3-) tetrahedra. The crystal structures of 2 and 3 are characterized by anionic chains (1) infinity{Nd[PS 4] 2} (3-) being separated by K (+) or Cs (+) ions. Along each chain the Nd (3+) ions are bridged by [PS 4] (3-) anions. The difference between the structures of 2 and 3 is that in 2 the Nd (3+) ions are coordinated by four edge-sharing [PS 4] (3-) tetrahedra while in 3 each Nd (3+) ion is surrounded by one corner-sharing, one face-sharing, and two edge-sharing [PS 4] (3-) tetrahedra. The structure of 4 is a three-dimensional network with K (+) cations residing in tunnels running along [110] and [110]. The {Nd(1)S 8} polyhedra share common edges with four [PS 4] tetrahedra forming one-dimensional chains (1) infinity{Nd[PS 4] 2} (3-) running along [110] and [110]. The chains are linked by {Nd(2)S 8} polyhedra yielding the final three-dimensional network (3) infinity{Nd[PS 4] 2} (3-). The internal vibrations of both crystallographically independent [PS 4] (3-) anions of 2- 4 have been assigned in the range 200-650 cm (-1) by comparison of their corresponding far/mid infrared and Raman spectra (lambda exc = 488 nm) on account of locally imposed C 1 symmetry. In the Fourier-transform-Raman spectrum (lambda exc = 1064 nm) of 2- 4, very similar well-resolved electronic Raman (ER) transitions from the electronic Nd (3+) ground-state to two levels of the (4)I 9/2 ground manifold and to the six levels of the (4)I 11/2 manifold have been determined. Resonant Raman excitation via a B-term mechanism involving the (4)I 15/2 and (4)F 3/2 intermediate states may account for the significant intensity enhancement of the ER transitions with respect to the symmetric P-S stretching vibration nu 1. Broad absorptions in the UV/vis/NIR diffuse reflectance spectrum at 293 K in the range 5000-25000 cm (-1) of 2- 4 are attributed to spin-allowed excited quartet states [ (4)(I < F < S < G < D)] and spin-forbidden doublet states [ (2)(H < G < K < D < P)] of Nd (3+). A luminescense spectrum of 3 obtained at 15 K by excitation with 454.5 nm shows multiplets of narrow lines that reproduce the Nd (3+) absorptions. Sharp and intense luminescence lines are produced instead by excitation with 514.5 nm. Lines at 18681 ( (4)G 7/2), 16692 ( (4)G 5/2), 14489 ( (4)F 9/2), and 13186 cm (-1) ( (4)F 7/2) coincide with the corresponding absorptions. Hypersensitive (4)G 5/2 is split by 42 cm (-1). The most intense multiplet at about 16500 cm (-1) is assigned to the transition from (4)G 5/2 to the Stark levels of the ground manifold (4)I 9/2. 相似文献
12.
A POMs-based 3D zeolike ionic crystal 1, {[Co(dpdo)2(CH3CN)(H2O)2]2(SiMo12O40)- (HEO)2}n (dpdo = 4,4'-bipyridine-N,N'-dioxide), was constructed via self-assembly by embedding Keggintype [SiMo12O40]^4- polyanions within the intercrystalline voids as pillars and structurally characterized. The crystal structure was determined by single-crystal X-ray diffraction. The crystal is of triclinic, space group P1 with a = 11.430(3), b = 12.242(3), c = 14.279(3)A, α = 106.196(4),β = 94.316(4), γ = 98.294(3)°, V = 1884.5(7)A^3 Z = 1, C44H50N10O54CoEMo12Si, Mr = 2880.17, Dc = 2.538 g/cm^3, p = 2.484 mm^-1,F(000) = 1388, the final R = 0.0383 and wR = 0.1096 for 7753 observed reflections with I 〉 2σ(I). Flack factor is 0.22(3). Compound 1 is a pillar-layered framework with the [SiMo12O40]^4- anions linearly located on the square voids between the 2D bilayers which are formed by the dpdo ligands and cobalt(II) ions. 相似文献
13.
Synthesis,Structure and Electrochemical Property of a Supramolecular Compound(H2en)2[Cu(en)2(H3O)2][Mo8O28] 总被引:1,自引:1,他引:0
A supramolecular compound(H2en)2[Cu(en)2(H3O)2][Mo8O28](en=ethylenediamine) was hydrothermally prepared and confirmed by elemental analysis and TG analysis.Single-crystal X-ray analysis reveals that the crystal crystallizes in the triclinic system,space group P1 with a=9.4635(4),b=9.8645(5),c=10.9794(5),α=69.2050(10),β=72.3730(10),γ=78.4510(10)o,Mr=1559.55,V=908.24(7)3,Z=1,Dc=2.851 g/m3,F(000)=749,μ=3.350 mm-1,S=1.000,the final R=0.0217 and wR=0.0567.The compound consists of(H2en)2+,[Mo8O28]8-anion and [Cu(en)2(H3O)2]2+ cations and constructs a 3D supramolecular structure through hydrogen bonds between the nitrogen atoms from en of [Cu(en)2(H3O)2]4+ fragments and the terminal oxygen atoms from the [Mo8O28]8-polyoxoanions.The electrochemical behavior of this compound has been studied in detail based on a solid bulk modified carbon paste electrode of compound(CPE). 相似文献
14.
Three novel 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles were designed,synthesized and characterized by IR,NMR and APCI-MS.3-o-Fluorophenyl-6-(4-decarboxydehydroabietyl)-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole(6a,C28H31FN4S) was structurally determined by single-crystal X-ray diffraction.The crystal belongs to the orthorhombic system,space group P212121 with a=6.0153(14),b=12.2577(19),c=34.055(3),V=2511.0(7)3,Z=4,Mr=474.63,Dc=1.255Mg/m3,λ=0.71073 ,μ(MoKα)=0.160 mm-1,F(000)=1008,the final R=0.0555 and wR=0.1248 for 3094 observed reflections with I2σ(I).There are six rings in the crystal structure of the title compound.The dihedral angle between 1,2,4-triazole and 1,3,4-thiadiaole rings is 1.4o,and that between 1,2,4-triazole and benzene ring D 25.5o. 相似文献
15.
1 INTRODUCTION The transition metal complexes with dmit ligand together with their derivatives have received signi- ficant attention due to their metallic-like electronic properties[1~8]. More recently, our researches show that they may be the new kind… 相似文献
16.
三核钼-硫簇合物的低热固相合成及其晶体结构 总被引:1,自引:0,他引:1
三核钼-硫配合物Mo_3S_7(dtc)_3I·S_8·2CH_2Cl_2(dtc=C_4H_8NCS_2~-)是由低热固相合成得到的。晶体属单斜晶系,M_r=1500.19,空间群P2_1/n,a=11.881(3),b=15.559(4),c=26.197(7),β=98.53(2)°,V=4789A~3,Z=4,D_c=2.08g/cm~3,F(000)=2920,μ(MoKα)=25.24cm~(-1),对于2397个I≥3σ(I)的独立衍射点,最终偏离因子R=0.060,R=0.066。该配合物的基本骨架是[Mo_3S_7(dtc)_3]~+,其簇芯为[Mo_3S_7]~(4+)单元,3中Mo原子组成正三角形平面,Mo-Mo的平均键长力2.723,Mo原子平面上的硫原子形成盖帽的μ_3-S,其Mo-S平均键长为2.383A,3个S_2基团分别位于三角形3个棱的外侧,并分别与邻近的两个Mo原子结合形成12中Mo-S键。与μ_3-S相对而位于平面另一侧的Ⅰ原子与3个μ_2-S连结,平均距离为3.257A,成键作用较弱。 相似文献
17.
CrystalandMolecularStructureofMethylene-bis[benzobicyclo(diaza-diphenyl)stannoxide],[o-O■n(C_6H_5)_2]_2CH_2·1/2C_6H_6WangJi-Tao;?.. 相似文献
18.
Synchrotron radiation X-ray powder diffraction data (SPDD) have been obtained for Ag[AgF4]2, Au[AuF4]2, Ag[AuF4], and Ag[AuF6]. Ag[AgF4]2 and Au[AuF4]2 are isostructural with Ag[AuF4]2, space group (SG) P2(1)/n, Z = 2, with the following: for Ag[AgF4]2 a = 5.04664(8), b = 11.0542(2), c = 5.44914(9) A, beta = 97.170(2) degrees; for Au[AuF4]2 a = 5.203(2), b = 11.186(3), c = 5.531(2) A, beta = 90.55(2) degrees. The structure of Ag[AgF4]2 was refined successfully (SPDD) applying the Rietveld method, yielding the following interatomic distances (A): AgII-F = 2.056(12), 2.200(13), 2.558(13); AgIII-F = two at 1.846(12), others = 1.887(12), 1.909(13), 2.786-(12), 2.796(12), 2.855(12). AgAuF4, like other AA'F4 salts (A = Na-Rb; A' = Ag, Au), crystallizes in the KBrF4 structure type, SG I4/mcm (140), Z = 4 with a = 5.79109(6), c = 10.81676(7) A. SPDD gave (in A) four AuIII-F = 1.89(1) and eight AgI-F = 2.577(7). SPDD for AgAuF6 confirmed that it has the LiSbF6 structure, SG R3, Z = 3, with a = 5.2840(2), c = 15.0451(6) A. 相似文献
19.
A metal-organic coordination compound formulated as [Cu(MOPIP)(BDC)]n·0.5n(H2O) 1(MOPIP = 2-(4-methoxyphenyl)-1H-imidazo[4,5-f][1,10] phenanthroline, BDC = 1,4-benze Nedicar- boxylate) has been hydrothermally synthesized and structurally characterized by elemental analysis, thermogravimetric analysis, IR spectrum, and single-crystal X-ray diffraction. The title compound crystallizes in the triclinic system, space group P, with a = 8.872(5), b = 11.163(6), c = 12.589(6) ?, α = 94.687(7), β = 99.930(6), γ = 103.074(7)°, V = 1186.7(12) ?3, C28H19CuN4O5.5, Mr = 563.01, Dc = 1.576 g/cm3, μ(MoKα) = 0.973 mm(1, F(000) = 576, Z = 2, the final R = 0.0607 and wR = 0.1618 for 3419 observed reflections (I > 2((I)). 相似文献
20.
本文用EHMO法计算四核簇离子S_4~(2+)、Se_4~(2+)、Te_4~(2+)、Bi_4~(2-)、Sn_4~(2-)和Ge_4~(2-)的电子结构。讨论了平面正四边形S_4~(2+)、Se_4~(2+)、Te_4~(2+)和Bi_4~(2-)簇离子与蝴蝶形四核原子簇在成键性质上的不同。比较Sn_4~(2-)、Ge_4~(2-)簇离子与P_4、As_4原子簇电子结构的差别,分析Sn_4~(2-)和Ge_4~(2-)稳定性较差的原因。 相似文献