一维链状1,8-萘二酸四核锌配位聚合物[Zn4(1,8-nap)4(4,4''-bipy)2·0.5en·H2O]n的合成、结构、热稳定性及发光性质

羧酸配位聚合物是金属离子与有机羧酸构造块通过配位键或其他分子间弱作用力经自组装而成的一维、二维、三维的聚合物.由于这些配位聚合物具有新颖的拓扑结构以及在功能材料方面的潜在应用,同时又由于羧酸配合物比较稳定,所以设计和调控特殊配位聚合物成了当前的研究热点[1～4].     

4-羧基苯氧乙酸锰配位聚合物[Mn(p-CPOA)(H_2O)_3]_n的合成与晶体结构

0引言由于羧酸化合物具有丰富的配位结构类型,而且羧酸桥联多核配合物广泛存在于生物体内金属蛋白和金属酶的活性部位,使其在配位化学中占有重要地位[1]。尤其是近年来,研究发现羧酸配位聚合物具有潜在的光学、磁学、吸附分离、信息储存以及催化等性能,使得由苯二甲酸,均苯三甲     

氢键构筑的新颖微孔配位聚合物[Co_2(Hisor)_2·(4,4′-bpy)_2(H_2O)_2]·4,4′-bpy的合成与结构

近年来 ,微孔配位聚合物的研究越来越引起人们的重视 .与传统的微孔材料硅酸盐、硅铝酸盐、磷铝酸盐等相比 ,微孔配位聚合物具有独特的优势 :一方面 ,可以将金属离子所特有的磁学、光学、电学和氧化 -还原等特性引入所设计合成的配位聚合物中 ;另一方面 ,有机配体的多样性、可修饰性和与各种金属离子的不同组合 ,为设计合成尺寸可控、形状可控和性质可控的各种配位聚合物提供了可能 .因此 ,微孔配位聚合物在分子磁性、分子识别、信息储存、分离、催化和非线性光学等方面有着广泛的应用前景 .于是 ,设计和合成微孔配位聚合物成为当前具有挑战…     

二维网状锌(Ⅱ)配位聚合物[Zn(HIDC)(bib)_(0.5)]_n的合成、晶体结构和荧光性质

<正>金属-有机配位聚合物(Metal-Organic Coordination Polymers,MOCPs)材料因其多变的结构拓扑以及其在离子交换、气体储存、分离、催化和荧光传感等方面的潜在应用已引起了科学家的广泛关注。氮杂环多元羧酸配体由于其骨架比较稳定,氮原子     

[｛Cd(hmbdc)_2(2,2′-bipy)_2｝·H_2O]_n的合成和晶体结构

0引言由于金属和有机配体的超分子构建的拓扑多样性和在功能材料方面的潜在应用,在近几年引起化学工作者的浓厚兴趣,成为一个热门的研究领域[1￣5]。众所周知,这类聚合物具有许多特殊的性能,在新功能材料如选择性催化、分子识别、超高纯度分离材料、光电材料、新型半导体材料、磁性材料等方面的开发中显示了诱人的应用前景[6,7]。在早期合成这类超分子配位聚合物时,人们常使用含N配体,如4,4′-联吡啶,1,2-双(4-吡啶)乙烷等配体[8]。近几年来,人们常选择含O的芳香羧酸及其衍生物作配体。如具有3D穿插结构的Zn化合物｛[Zn(dpe)(OH-BDC)](d…     

一维链{[Mn2(2，2′-bipy)4(3，3′-tda)]·2ClO4}n配合物的合成、结构与磁性研究

由于柔性羧酸配体具有丰富多样的配位方式和灵活多变的分子结构,可以用来设计合成多种具有新颖结构和性质的配位聚合物,因而正逐渐引起研究者的关注[1-6].     

配位聚合物{[Cu_2(nbdo)_2·(H_2O)_2]·2(H_2O)}_n的热稳定性以及荧光性能和储氢性能(英文)

合成了一种新的以柔性羧酸为配体的铜配位聚合物,考察了其热稳定性能、荧光性能及储氢能力.结果表明,配体2-硝基-苯-1,4-二(氧乙酸)表现出较好的柔韧性;该结构在温度低于541 K的环境中比较稳定,当温度高于541 K迅速发生分解并伴随着轻微的爆轰.配合物的荧光光谱与配体的相比有所蓝移.与此同时,该配合物的储氢能力随着氢气压力的增加而提高;当氢气压力为5.0 MPa时储氢能力可达0.42%.     

配合物[Mn(4,4′-bipy)_2(H_2O)_4](HtsgluO)_2·2H_2O的合成及性质研究

<正>金属-有机框架材料(MOFs)是一类具有高度结晶性的配位聚合物,具有很好的稳定性、大的空穴体积和尺寸均一可调的孔洞。近年来,由于其在储氢、分离以及固相催化方面的潜在应用而引起人们的广泛兴趣[1-4]。MOFs的合成条件温和,可以通过选择合适金属离子和有机配体使之更符合特定性能的要求,即金属离子和有机配体的选择是关键。一     

一维链状的2-氧-1(4H)-吡啶氮乙酸钴配位聚合物{[Co(2-OPA)2(4,4''-bipy)(H2O)2]·6H2O}n的合成、结构及性能研究

由于吡啶氮羧酸及其衍生物具有多种键合模式和广泛的生物学特性,近10年来由其与金属离子所形成的配合物研究已引起了人们的极大关注[1].作为吡啶氮羧酸衍生物之一的2-氧-1(4H)-吡啶氮乙酸,是合成抗生素的重要医药中间体[2],而且同时具有羰基和羧基两个配位活性基团,具有灵活多样的配位方式、可塑性强和空间构型多变等结构特点,从而为构筑具有新颖拓扑网络结构和性能的超分子聚合物体系提供了丰富多彩的识别和组装方式.     

新型三维配位聚合物[Fe(C_5H_4NCOO)_2]_n的可控合成、晶体结构和UV-VIS-NIR反射光谱研究

近年来，金属有机配位聚合物由于其独特的电学、磁学、催化和光学性能而受 到普遍关注。通过选择不同的多齿配体和金属离子，可以组装成具有各处新型骨架 结构和特殊物理化学性能的配位聚合物。异烟酸根可以通过吡啶环氮原子和羧基氧 原子与金属离子配位，生成配位聚合物。本文采用三氯化铁和4-氰基吡啶在水热条 件下的反应可控地合成具有三维骨架结构的配位聚合物[Fe(C_5H_4NCOO)_2]_n，并 进行元素分析、红外光谱表征，单晶结构测定和UV-VIS-NIR（紫外-可见-近红外） 反射光谱研究。     

Crystal structures of phosphomolybdyl salts: Pb(MoO2)2(PO4)2 and Ba(MoO2)2(PO4)2

Crystal structures of Pb(MoO₂)₂(PO₄)₂ and Ba(MoO₂)₂(PO₄)₂ were determined. Both compounds contain the molybdyl group MoO₂. The monoclinic unit-cell parameters are a = 6.353(7), b = 12.289(4), c = 11.800 Å, β = 92°56(6), and Z = 4 for the lead salt and a = 6.383(8), b = 7.142(7), c = 9.953(8) Å, β = 95°46(8), and Z = 2 for the barium salt. $\text{P2}{}_1\text{c}$ is the common space group. The R values are respectively R = 0.027 and R = 0.031 for 1964 and 1714 independent reflections. The frameworks built up by a three-dimensional network of monophosphate PO₄ and molybdyl MoO₂ groups are similar, characterized mainly by corner-sharing PO₄ and MoO₆ polyhedra. Two oxygen atoms of each MoO₆ group are bonded to the molybdenum atom only as in other molybdyl salts.     

[COH(NH2)2]2[Cu(pic)2(ClO4)2]的合成与晶体结构

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， D_x=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.     

Ba3 (VO4)2-K2 Ba(MoO4)2 and Pb3 (VO4)2-K2 Pb(MoO4)2 systems

Phase equilibria in the Ba₃(VO₄)₂-K₂Ba(MoO₄)₂ and Pb3(VO₄)₂-K₂Pb(MoO₄)₂ systems have been investigated. In the first system, a continuous series of substitutional solid solutions with the palmierite structure is formed, and in the second one, the polymorphic transition in lead orthovanadate at 100°C restricts the extent of the palmierite-type solid solution to 10–100 mol % K₂Pb(MoO₄)₂. Original Russian Text ? V.D. Zhuravlev, Yu.A. Velikodnyi, A.S. Vinogradova-Zhabrova, A.P. Tyutyunnik, V.G. Zubkov, 2008, published in Zhurnal Neorganicheskoi Khimii, 2008, Vol. 53, No. 10, pp. 1746–1748.     

Qualitative structure of (CO2)2 and (OCS)2

Molecular beam deflection studies on (CO₂)₂ and (OCS)₂ indicate that both these species are polar molecules. Structural implications of this are explored in light of previous studies of these systems.     

A novel three-dimensional malonate-bridged complex {[Cu4(4,4′- bpy)8(mal)2(H2O)4](ClO4)2(H2O)4(CH3OH)2}n

A novel malonate-bridged copper (II) compound of formula {[Cu₄(4,4′-bpy)₈(mal)₂(H₂O)₄](ClO₄)₂(H₂O)₄(CH₃OH)₂}_n (4,4′-bpy = 4,4′-bipyridine; mal = malonate dianion) has been prepared and structurally characterized by X-ray crystallography. This compound exhibits a novel three-dimensional network being composed of Cu-4,4′-bipyridine layers which are pillared by malonate bridge ligands. The copper(II) ions has two different coordination environment.     

Synthesis, molecular structure, and catalytic activity of borohydride complexes [(Me3Si)2NC(NPri)2]2Nd(BH4)2Li(thf)2 and [(Me3Si)2NC(NPri)2]2Sm(BH4)2Li(thf)2

The reactions of lanthanide tris(borohydrides) Ln(BH₄)₃(thf)₃ (Ln = Sm or Nd) with 2 equiv. of lithium N,N′-diisopropyl-N′-bis(trimethylsilyl)guanidinate in toluene produced the [(Me₃Si)₂NC(NPrⁱ)₂]Ln(BH₄)₂Li(thf)₂ complexes (Ln = Sm or Nd), which were isolated in 57 and 42% yields, respectively, by recrystallization from hexane. X-ray diffraction experiments and NMR and IR spectroscopic studies demonstrated that the reactions afford monomeric ate complexes, in which the lanthanide and lithium atoms are linked to each other by two bridging borohydride groups. The complexes exhibit catalytic activity in polymerization of methyl methacrylate. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 441–445, March, 2007.     

Platinumolefin bond strength in Pt(PPh3)2(CH2CH2) and Pt(PPh3)2 {C(CN)2C(CN)2}

The enthalpy of the reaction: Pt(PPh₃)₂ (CH₂CH₂)(cryst.) + C(CN)₂C(CN)₂ (g) → Pt(PPh₃)₂ {C(CN)₂C(CN)₂}(cryst.) + CH₂ CH₂ (g) has been determined as ΔH₂₉₈=?155.8±8.0 kJ·mol^?1, from solution calorimetry. The interpretation, that the platinumethylene bond is much weaker than the platinumtetracyanoethylene bond, is contrary to conclusions drawn recently from electron emission spectroscopic studies, but in agreement with available structural data.     

Structural study of Mn2(CO)8[P(NMe2)3]2

An X-ray crystal structure determination for the bimetallic complex Mn₂(CO)₈-[P(NMe₂)₃]₂ reveals that the P(NMe₂)₃ ligands are trans to the Mn---Mn bond and the Mn---Mn bond distance is relatively long, 2.946(1) Å.     

A new three-dimensional cobalt phosphate: Co5(OH2)4(HPO4)2(PO4)2

A three-dimensional (3D) cobalt phosphate: Co₅(OH₂)₄(HPO₄)₂(PO₄)₂ (1), has been synthesized by hydrothermal reaction and characterized by single-crystal X-ray diffraction, thermogravimetric analysis, and magnetic techniques. The title compound is a template free cobalt phosphate. Compound 1 exhibits a complex net architecture based on edge- and corner-sharing of CoO₆ and PO₄ polyhedra. The magnetic susceptibility measurements indicated that the title compound obeys Curie-Weiss behavior down to a temperature of 17 K at which an antiferromagnetic phase transition occurs.     

Studies on (SCN)2M(NCS)2Hg2(p-tolyl)2 and (SCN)2M(NCS)2Hg2(α-naphthyl)2 and their complexes

p-Tolyl mercury thiocyanate and α-naphthyl mercury thiocyanate react with Co(NCS)₂2py and form a bimetallic pink compound of formula (py)₂(SCN)₂Co(NCS)₂Hg₂R₂ (R = p-tolyl and α-naphthyl group). On heating this compound in vacuum a blue compound (SCN)₂Co(NCS)₂Hg₂R₂ is formed. Nickel analogues (SCN)₂Ni(NCS)₂Hg₂R₂ are formed by direct reaction of p-tolyl or α-naphthyl mercury thiocyanate with nickel thiocyanate. (SCN)₂Co(NCS)₂Hg₂R₂ and (SCN)₂Ni(NCS)₂Hg₂R₂ act as Lewis acids and form complexes with bases. The Lewis acids and their complexes with various bases have been characterized by elemental analyses, molar conductance, molecular weight, magnetic moment, infrared and electronic spectral studies. These studies reveal that both the Lewis acids are monomers. In (SCN)₂Co(NCS)₂Hg₂R₂ the CO(II) has tetrahedral geometry, where as in (SCN)₂Ni(NCS)₂Hg₂R₂ the Ni(II) has octahedral geometry through elongated axial bondings with SCN-groups of other molecules. Thiocyanate bridging of the type R-Hg-SCN-M [M = Co(II), Ni(II)] is present in the compounds. Pyridine and dimethylsulphoxide form adducts with these compounds by coordinating at Co(II) or Ni(II). The thiocyanate bridge is retained in these complexes. 2-2′bipyridyl ruptures the thiocyanate bridging in both the Lewis acids and forms cationic-anionic complexes of the type [M(L-L)₃][RHg(SCN)₂]₂. In both the type of complexes Co(II) and Ni(II) possess octahedral environment. The “softness” values have been used in a novel manner in proposing the structure of the complexes.