共查询到19条相似文献,搜索用时 203 毫秒
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通过有限个过渡金属离子如Fe,Ni,Cr,Mn与O、OH、-O或-O2CR等桥联原子或基团键合形成的具有不同尺寸的环形轮状金属离子簇合物或分子簇合物是近年来的研究热点之一[1,2].它们不仅具有独特的结构,而且在催化、非线性光学、分子自组装等方面具有潜在的应用价值[3~5].特别是具有三角型结构的过渡金属-氧轮簇化合物由于可以作为单分子磁体的磁性交换和电子耦合的研究体系,引起了研究人员的极大地兴趣[6,7].研究表明,具有[M(μ3-O)(O2CR)6L3]0/+,(M=Fe3+或Mn3+,L为水或吡啶,R为烷基或芳香基团)结构的化合物具有反铁磁作用[8,9]. 相似文献
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有机-无机杂化材料[Na2(H2O)4]2[γ-Mo8O26·(Gly-Gly)2]·4H2O的合成及晶体结构 总被引:2,自引:2,他引:2
多金属氧酸盐因其独特的结构而具有较高的抗肿瘤及抗病毒活性,蛋白质和肽是氨基酸的聚合体,氨基酸侧链官能团能与多金属氧酸盐形成新型配合物.了解氨基酸和肽与多金属氧酸盐的相互作用对于深入研究多金属氧酸盐抗肿瘤及抗病毒机理很有意义.我们曾报道了赖氨酸、丙氨酸及甘氨酸二肽与钼磷酸所形成化合物的晶体结构. 相似文献
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传统的微孔晶体材料是以硅酸盐、硅铝酸盐、磷铝酸盐和无机金属磷酸盐等作为结构的骨架[1,2]. 近几年来, 出现了一类新型的无机-有机杂化微孔晶体材料, 这类晶体材料是用刚性和热稳定性较好的有机分子(如芳香多酸和多碱)和金属离子作为骨架的结构单元. 它们能够在去除孔道中的溶剂分子后仍然保持骨架的完整性, 而且其孔道的直径在0.4~1.0 nm之间, 比表面积远大于相似孔道的分子筛. 因此, 这类材料具有许多潜在的特殊性能, 在选择性催化、分子识别和可逆性主客体分子(离子)交换等方面具有诱人的应用前景. Yaghi等[3~11]利用不同的有机分子和各种金属制备出了许多这类晶体材料. 对苯二酸是常见的有机配体, 以它和金属离子为结构骨架所形成的无机-有机杂化微孔晶体有Zn3(BDC)3*(CH3OH),Zn(BDC)*(DMF)(H2O),(TPT)(Py)Cd和Zn4O(BDC)3*(DMF)8(C6H5Cl)等[12~15], 但在对苯二酸与金属构成的骨架中, 由于有多个乙二醇分子配位, 很少形成稳定的三维骨架结构的无机-有机杂化微孔晶体. 相似文献
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分子组装在材料科学、催化和生物化学中具有潜在的应用前景,所以分子组装引起了化学、固体物理学和生物学等领域科学家们的普遍关注犤1犦。分子组装常用的方法是使用具有配位能力的金属配合物作为建筑块与过渡金属阳离子反应。氰基桥联多核配合物由于其结构的多样性和具有特别优异的磁性质,近10年来在配位化学领域倍受关注犤2~8犦。在系列配合物犤M(en)2犦犤Ni(CN)4犦(M=Ni,Cu,Zn,Cd等)中,犤Cu(en)2犦犤Ni(CN)4犦和犤Cd(en)2犦犤Ni(CN)4犦的晶体结构已经通过单晶衍射的方法测得犤9,10犦。在犤Cu(en)2犦犤Ni(CN)4犦中,Cu原子为六配… 相似文献
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由Cu(Ⅱ)的硝酸盐与四氟对苯二甲酸(H2tfbdc)的自组装得到标题配合物.用元素分析、红外光谱、热重分析、X-衍射单晶结构分析等对其进行了表征.晶体结构表明,标题配合物的晶体属单斜晶系,空间群为C2/c,晶胞参数:a=3.3739(5)nm,b=1.5696(2)am,c=1.641 9(2)nm,β=1 17.527(2)°.每个铜离子与来自4个四氟对苯二甲酸分子的4个氧原子和1个N,N-二甲基甲酰胺分子中的氧原子配位,形成四方锥的配位构型.四氟对苯二甲酸根桥连铜离子形成具有孔穴的二维层状结构,相邻的层状结构又通过氢键形成三维的超分子网络结构.配合物中一些苯环上的-CF基团具有无序结构.变温磁化率数据(300~1.8 K)显示配合物中分别存在反铁磁性和铁磁性相互作用. 相似文献
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The title compound was synthesized by reaction of Cu(ClO4)2, picolinic acid and carbamide in C2H5OH/CH3CN solution, and characterized by single-crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group Pbca with a=14.0481(8), b=9.0130(5), c=18.626(1)?, V=2358.3(2)?3, Z=4, Dx=1.771g·cm-3, μ=1.235mm-1 and F(000)=1276. The final R factor is 0.0440 for 1434 observed reflections. The X-ray analysis revealed that the copper(Ⅱ) atom is coordinated by two picolinic ligands in the equatorial plane, while the two oxygen atoms of perchlorate occupy the axial positions of octahedron with lengthened Cu-O distances, resulting in a 4+2 elongated octahedral environment. In the compound, there also exist two protonated carbamide cations for charge balance. CCDC: 195354. 相似文献
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Two novel Ni(II) complexes {[Ni(en)2(pot)2]0.5CHCl3} (3) {pot = 5-phenyl-1,3,4-oxadiazole-2-thione} (1) and [Ni(en)2](3-pytol)2 (4) {3-pytol = 5-(3-pyridyl)-1,3,4-oxadiazole-2-thiol} (2) have been synthesized using en as coligand. The metal complexes have been characterized by physical and analytical techniques and also by single crystal X-ray studies. The complexes 3 and 4 crystallize in monoclinic system with space group P21/a and P121/c, respectively. The complex 3 has a slightly distorted octahedral geometry with trans (pot)− ligands while 4 has a square planar geometry around the centrosymmetric Ni(II) center with ionically linked trans (3-pytol)− ligands. The π?π (face to face) interaction plays an important role along with hydrogen bondings to form supramolecular architecture in both complexes. 相似文献
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Lydie Valade Hélène CasellasStéphane Roques Christophe FaulmannDominique de Caro Antoine ZwickLucien Ariès 《Journal of solid state chemistry》2002,168(2):438-443
Thin films and nanowires of the molecular superconductor TTF[Ni(dmit)2]2 (TTF = tetrathiafulvalene, dmit2−=2-thioxo-1,3-dithiol-4,5-dithiolato) are obtained by dipping process on stainless-steel and silicon conversion coatings and on a microrough silicon surface. The deposits are characterized by SEM, Raman spectroscopy and conductivity measurements. 相似文献
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Bing Luo 《Journal of organometallic chemistry》2004,689(3):666-671
The reactivity of bis(dimethylamido) complexes of phenyl- and hydridogallium with ammonia, dimethylamine and 1,1-dimethylhydrazine is described. Synthesis of the starting gallium hydride, [HGa(NMe2)2]2, was achieved in nearly quantitative yield from the reaction of HGaCl2(quinuclidine) with LiNMe2. In neat ammonia or methylamine at room temperature both dimethylamido ligands in [HGa(NMe2)2]2 were substituted by a single equivalent of NH3 or MeNH2 to produce amorphous (HGaNH)n or (HGaNMe)n, respectively. In contrast, the reaction of [PhGa(NMe2)2]2 with neat Me2NNH2, at room temperature consumed two equivalents of the substituted hydrazine to form [PhGa(NHNMe2)2]2 in a 73% yield. Single crystal X-ray crystallographic analyses of [HGa(NMe2)2]2 and [PhGa(NHNMe2)2]2 establish that in the solid state both compounds adopt a cyclic Ga-N-Ga-N structure with a crystallographic center of symmetry located at the center of the ring. 相似文献
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Double complex salts (DCSs) [Co(NH3)6][Fe(CN)6] (I) and [Co(NH3)6]2[Cu(C2O4)2]3 (II) and complex [Co(NH3)6]2(C2O4)3·4H2O (III) are synthesized and investigated by single crystal XRD, crystal optics, and elemental analysis. The crystalline phases of
I, II, and III (R-3, P21/c, and Pnnm space groups respectively) have the following crystallographic characteristics: a = 10.9804(2) ?, b = 10.9804(2) ?, c = 10.8224(3) ?, V = 1130.03(4) ?3, Z = 3, d
x = 1.65 g/cm3 (I); a = 9.6370(2) ?, b = 10.2452(2) ?, c = 13.2108(3) ?, V = 1932.90(9) ?3, Z = 2, d
x= 1.97 g/cm3 (II), and a = 11.7658(3) ?, b = 11.7254(3) ?, c = 14.1913(4) ?, V = 1304.34(5) ?3, Z = 2, d
x = 1.68 g/cm3 (III). This paper investigates the products of DCS thermolysis in a hydrogen atmosphere: the intermetallic compound CoFe with
the bcc parameter a = 2.852 ? for I and a heterogeneous mixture of Co and Cu in the decomposition of II. The coordinated CN− and C2O42− groups then turn into NH3, hydrocarbons, and CO2. The dominant hydrocarbon is methane. 相似文献
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A. Leineweber 《Journal of solid state chemistry》2003,176(1):198-202
A re-interpretation and re-evaluation of single-crystal X-ray diffraction data of a previously reported ‘(NH4)2(NH3)[Ni(NH3)2Cl4]’ (J. Solid State Chem. 162 (2001) 254) give a new formula (NH4)2−2z[Ni(NH3)2]z[Ni(NH3)2Cl4] with z=0.152. This new formula results from defects in an idealized ‘(NH4)2[Ni(NH3)2Cl4]’ basic structure, where two adjacent NH4+ cations are replaced by one Ni(NH3)22+ unit. Cl− anions from the basic structure complete the coordination sphere of the new Ni2+ to [Ni(NH3)2Cl4]2−. 相似文献
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在水溶液中合成了离子型配合物[Ni(phen)2(H2O)2][Ni(PDC)2]•7H2O (H2PDC=吡啶-2,6-二甲酸, phen=1,10-菲啰啉). 通过元素分析、红外光谱、单晶X射线衍射以及热重分析对配合物进行了表征. 晶体数据解析表明, 化合物属于三斜晶系, 空间群为P1, a=1.0092(4) nm, b=1.4599(6) nm, c=1.4933(5) nm, α=73.982(2)°, β=78.652(2)°, γ=75.184(3)°, V=2.0256(13) nm3, Z=2, F(000)=1004, μ=1.014 mm-1, R1=0.0538, wR2=0.1493. 配合物中的结晶水分子形成一个(H2O)12水簇, (H2O)12水簇通过氢键连接为二维水网, 最终构成三维超分子网络. 相似文献
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D. P. Domonov S. I. Pechenyuk N. L. Mikhailova A. T. Belyaevskii 《Russian Journal of Inorganic Chemistry》2007,52(7):1027-1032
The thermolysis of the complexes [Co(NH3)6]2C2O4[Cu(C2O4)2]2 (I) and [Co(NH3)6]Cl[Cu(C7H4O3)2] (II) in air and hydrogen at 200, 350, and 500°C and the composition and properties of the thermolysis products are considered.
The oxidative thermolysis of the complexes yields mixtures of cobalt and copper oxides, including mixed ones. The reductive
thermolysis of the complexes yields a Co + Cu bimetallic powder in the case of compound I and a Co + Cu + C powder in the
case of compound II. The thermal behavior of the complexes is governed by the nature of the ligand coordinated to the copper
atom. The observed data are explicable in terms of the properties of this ligand. The chemistry of the oxidative and reductive
thermolysis is discussed.
Original Russian Text ? D.P. Domonov, S.I. Pechenyuk, N.L. Mikhailova, A.T. Belyaevskii, 2007, published in Zhurnal Neorganicheskoi
Khimii, 2007, Vol. 52, No. 7, pp. 1104–1110. 相似文献
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Cyclohexane solutions of [W(Cp)(CO)3]2 and [Mo(Cp)(CO)3]2 exhibit weak bimodal emission spectra when excited With 354 nm picosecond pulses, but do not luminesce when pumped at 530 nm. Picosecond lifetimes characterize the short-wavelength, emission bands, which may originate from metal-cyclopentadienyl CT excited states. 相似文献