共查询到20条相似文献,搜索用时 31 毫秒
1.
Ali Rahmatpour 《Reactive and Functional Polymers》2010,70(11):923-929
The one-pot polycondensation of dihydroxyaromatic compounds such as hydroquinone, 2,2-di(4-hydroxy phenyl) propane (Bisphenol A), 4,4′-dihydroxybiphenyl, dihydroxynaphthalenes (1,5- and 2,6-) with 2,5-dimethoxytetrahydrofuran as a reactive protected 1,4-dicarbonyl compound using trifluoroacetic acid as both solvent and condensing agent leads to condensation polymers having linear and ladder structure with high thermal stability. Optimal conditions for polycondensation were obtained via study of the model compounds. All polymers were obtained in high yields and with varying molecular weights (η = 0.16–0.31 dl/g). The structure of the polymers were characterized by NMR, FTIR spectroscopies and TG. 相似文献
2.
Guang-Xiang Liu Heng Xu Xiao-Ming Ren Sadafumi Nishihara Yan Wang 《Inorganic chemistry communications》2009,12(6):498-501
Two novel coordination polymers, [Zn2(FA)(4,4′-bipy)2]·2H2O (1) and Cd2(FA)(2,2′-bipy) (2), (H4FA = 4,4′-(hexafluoroisopropylidene)diphthalic acid, 4,4′-bipy = 4,4′-bipyridine, 2,2′-bipy = 2,2′-bipyridine), have been synthesized under hydrothermal conditions, and their structures were determined by single-crystal X-ray diffraction. Polymer 1 features an unusual three-dimensional (3D) network with (4 · 62 · 83)(42 · 62 · 82) topology. Polymer 2 has a complicated 3D framework and crystallizes in non-centrosymmetric space group (Fdd2) belonging to polar point group (C2v), which displays a strong SHG response and ferroelectric properties. Moreover, the luminescent properties of 1 and 2 have also been investigated. 相似文献
3.
Feilong Hu Xianhong Yin Yan Mi Jinlei Zhang Yue Zhuang Xianzhen Dai 《Inorganic chemistry communications》2009,12(7):628-631
A novel pyrazole complex, namely [Cu2(4,4′-bpy)2(2,2′-bpy)(L)2]·6H2O has been synthesized under mild condition (4,4′-bpy = 4,4′-bipyridine, 2,2′-bpy = 2,2′-bipyridine). We report the structural evidence in the solid state of discrete water hexamers chair-like conformation. These units were found to act as supramolecular glue in the aggregation of dinuclear copper (II) complex to give a three dimensional network through hydrogen-bonding. The preliminary investigation on the electrochemical property and fluorescence property of the complex are presented. 相似文献
4.
《Inorganic chemistry communications》2008,11(10):1260-1263
A novel 3D coordination polymer {[Dy2(bpdc)3(H2O)3] · H2O}n (bpdc = 2,2′-bipyridine-4,4′- dicarboxylate) based on inorganic rod-shaped infinite secondary building unit is presented, which possesses unusual mixed-connected network topology and shows high thermal stability and strong photoluminescence at room temperature. 相似文献
5.
Hydrothermal reaction of Cu(NO3)2·3H2O with BIBP and H2hfipbb at 105 °C yielded a novel 3D Cu(II) coordination polymer, {[Cu2(BIBP)0.5(hfipbb)2(CH3CN)]·5H2O}n (1) [BIBP = 5,5′-bis(1H-imidazol-1-yl)-2,2′-bithiophene, H2hfipbb = 4,4′-(hexafluoroisopropylidene)bis(benzoic acid)]. Compound 1 displays a 3D 2-fold interpenetrating framework with {44.66} sqp topology, containing interesting ⋯LRLR⋯ double helical chains. The compound 1 was characterized by IR spectra, elemental analysis, thermal analysis and single crystal X-ray diffraction. In addition, solid-state UV–vis spectra experiment shows that compound 1 exhibits semiconductive property with a band gap of 2.46 eV. 相似文献
6.
《Inorganic chemistry communications》2008,11(10):1221-1223
Reaction of 2,2′,4,4′-biphenyltetracarboxylic acid (2,4-H4bptc), Zn(NO3)2 · 6H2O in the presence of NaOH hydrothermally at 180 °C affords the first 2,4-H4bptc complex [Zn3(μ3-OH)2(2,4-bptc)]n · 2nH2O (1). Crystal structure indicates that 1 is Zn2(OH)2 diamond-core chains linked through 2,2′,4,4′-biphenyltetracarboxylate. 1 was characterized by TG, IR and fluorescence spectra. 1 is the first example of 2,4-H4bptc complex and also first neat Zn2(OH)2 diamond-core chains. 相似文献
7.
《Inorganic chemistry communications》2007,10(6):661-665
Two copper(II) complexes, Cu2{3,5-(NO2)2sal}2(2,2′-bipy)2 · 0.5H2O (1) and [Cu2{3,5-(NO2)2sal}2(4,4′-bipy)(H2O)2]n (2) (3,5-(NO2)2sal = 3,5-dinitrosalicylate, 2,2′-bipy = 2,2′-bipyridine, 4,4′-bipy = 4,4′-bipyridine), were synthesized by hydrothermal reactions and characterized by single crystal X-ray analysis. There are discrete cyclic binuclear structure in 1 and 2D herringbone-like network structure in 2, although bridging ligand 3,5-(NO2)2sal in 1 and 2 has same coordination model. Variable temperature magnetic measurement reveals small ferromagnetic interactions in complex 1. 相似文献
8.
《Inorganic chemistry communications》2007,10(6):731-734
Spiro-linked orthogonal bisilole, 2,3,3′4,4′5-hexaphenyl-1,1′-spirobisilole, has been synthesized and characterized. Its crystal structure and optical properties were also investigated. This compound shows high thermal stability and strong bluish-green emission(λmax = 509 nm) with high PL efficiency (55 ± 5%). 相似文献
9.
《Inorganic chemistry communications》2008,11(10):1276-1279
The 1D chain coordination polymer {[Cu(SO4)(dpmd)2] · 8H2O} (1, dpmd = 4,4′-dipyridylmethanediol) has been prepared by a solution phase method and characterized by single-crystal X-ray diffraction, IR and thermogravimetric analysis. The dpmd ligand was formed in situ from 4,4′-dipyridylketone. Decorated 1D water molecule chains with a very rare C14 classification co-crystallized and were stabilized within the coordination polymer matrix. 相似文献
10.
《Inorganic chemistry communications》2005,8(11):1045-1048
Porous lanthanide coordination polymers, {[Ln2(atpt)3(H2O)2] · 0.5(4,4′-bpy)(H2O)}n [Ln = Eu(1), Gd(2), Yb(3), H2atpt = 2-aminoterephthalic acid, 4,4′-bpy = 4,4′-bipyridine] were obtained by hydro-solvothermal reaction, in which 4,4′-bpy acts as template. For the first time the nitrogen atom of an atpt ligand coordinates to metal ions in 1–3. The photophysical properties and thermal stability of 1 were investigated. 相似文献
11.
Two new luminescent mononuclear Pt(II) chloride complexes possessing C-linked 2,2′-bipyridyl tetrazole terdentate chelating ligands, namely, Pt(tbpy)Cl (1) and Pt(tmbpy)Cl (2) (tbpyH = 6-(1H-tetrazol-5-yl)-2,2′-bipyridine; tmbpyH = 6-(1H-tetrazol-5-yl)-4,4′-dimethyl-2,2′-bipyridine), have been synthesized and characterized. Complex 2 adopts a distorted square-planar geometry with a mono-anionic terdentate chelate tmbpy, and it presents a zigzag head-to-tail stacking array along the a axis with alternating Pt⋯Pt separations of 3.415 and 5.469 Å. For 2, a moderately intensive broad absorption band appears at 350–425 nm in dilute DMF solution, most likely assigned as the metal-to-ligand charge transfer 1MLCT (Pt(5d) → tmbpy) transition, mixed with some halide-to-ligand charge transfer 1XLCT (Cl → tmbpy) and intraligand (IL) 1ππ* transitions inside tmbpy. It is demonstrated that the solubilities and luminescence properties of 1 and 2 are markedly influenced by the substituents in the 4 and 4′-positions of the 2,2′-bipyridyl ring. The solid-state emissions of 1 and 2 are perhaps best attributable to the 3MMLCT/3XLCT/3IL states, as supported by TD-DFT calculation of 2. 相似文献
12.
Matthew R. Montney Justin G. Thomas Ronald M. Supkowski Ryan J. Trovitch Jon Zubieta Robert L. LaDuca 《Inorganic chemistry communications》2009,12(6):534-539
Hydrothermal reaction of CuCl2, MoO3, and 4,4′-dipyridylketone (4,4′-dpk) afforded green crystals of the mixed metal oxide phase {[Cu2(MoO4)2(4,4′-dpk)(H2O)]·H2O}n (1). According to single-crystal X-ray diffraction, {Cu2O2} dimers link into 1-D {Cu2O2(μ-H2O)}n chains via bridging aqua ligands. These chains form [Cu2(MoO4)2(H2O)]n slabs via linkage through tetrahedral molybdate anions. In turn, the copper molybdate slabs are pillared through tethering 4,4′-dpk ligands into a 10-connected three-dimensional lattice with an unprecedented 312430526 topology. Variable temperature magnetic data above 140 K were fit to the Curie–Weiss law, with C = 0.17 cm3 K/mol Cu and Θ = 70 K, indicating likely ferromagnetic coupling within the dinuclear kernels of 1; low temperature data points towards the possibility of interdimer antiferromagnetic interactions. 相似文献
13.
Two new indium coordination polymers formulated as [In(BPDA)(phen)Cl]n (1) and [In(BDC)(HBDC)·2DMF]n (2) (H2BPDA = 2,2′-biphenyldicarboxylic acid, C14H10O4; phen = 1,10-phenanthroline, C12H8N2; H2BDC = 1,3-benzenedicarboxylic acid, C8H6O4; DMF = N,N-dimethylformamide, C3H7NO) have been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction, infrared (IR), thermal gravimetric analyses (TG) and luminescent studies. Molecular structural analyses reveal that complex 1 exhibits an indium-2,2′-biphenyldicarboxylate helical chained structure decorated with 1,10-phenanthroline, and complex 2 possesses a two-dimensional (2D) layered structure constructed by 1,3-benzenedicarboxylate ligands and InO6 octahedra, which has a (4,4) topological structure. Blue-green emission at 480 nm (λex = 340 nm) for 1, intense blue-green emission at 492 nm, green emission at 535 nm, and yellow-green emission at 576 nm (λex = 340 nm) for 2 are observed in the solid state at room temperature. 相似文献
14.
Dong Xie Junwei Ye Zhao Liu Xiangdong Zhang Hao Meng Yuan Lin Guiling Ning 《Inorganic chemistry communications》2009,12(2):72-75
A novel cadmium(II) coordination polymer, [Cd2(pzdc)2(4,4′-bpy)2]·4H2O (1) (H2pzdc = pyrazine-2,3-dicarboxylic acid; 4,4′-bpy = 4,4′-bipyridine), has been synthesized by hydrothermal reaction of Cd(OAC)2, H2pzdc and 4,4′-bpy. Single-crystal X-ray diffraction analysis reveals that 1 constructed from dinuclear building blocks has a three-dimensional (3-D) structure with rob topology. Fluorescent measurement of 1 exhibits strong blue-green emission in the solid state at room temperature, and its framework possess remarkable thermal stability. 相似文献
15.
Three new coordination polymers, [Mn(L)(H2O)2]2·5H2O (1), [Cu(L)(4,4′-bipy)]2·H2O (2) and [Pb(L)(4,4′-bipy)0.5] (3) (H2L = 5-(pyridin-4-yl)isophthalic acid; 4,4′-bipy = 4,4′-bipyridine) have been synthesized and characterized by IR, thermogravimetric analysis, X-ray powder diffraction and X-ray single crystal diffraction. Complex 1 shows a 2D layer structure which stacks with the other ones to form 1D channels to hold 1D water chains. Complex 2 displays a 3D + 3D → 3D polycatenation network. 3 shows a unique 2D + 2D → 3D polycatenation net in which each Pb center has a hemidirected coordination geometry due to the existence of “inert pair effect”. The thermal and luminescent properties of 1–3 were also examined. 相似文献
16.
Xiao-Ying Huang Ke-Fen Yue Jun-Cheng Jin Jian-Qiang Liu Cheng-Jun Wang Yao-Yu Wang Qi-Zhen Shi 《Inorganic chemistry communications》2010,13(3):338-341
The chiral diamondoidlike Cd(II) containing coordination polymer {[Cd(oba)(bib)]·2H2O}n (1) (oba = 4,4′-oxybis(benzoate), bib = 1,4-bis(2-methyl-imidazol-1-yl)butane) is reported; the 3D networks interpenetrate fivefold, nevertheless leave cavities capable of including sizable guest molecules. This compound also exhibits high thermal stability and blue-shift emission, and can be explored for potential blue luminescent materials. 相似文献
17.
《Inorganic chemistry communications》2005,8(8):746-750
Two new helical Cu(II) coordination polymers, [Cu(2,2′-bpy)(Hsgly)]Cl · 2H2O(H2sgly = N-(2-hydroxylbenzyl)glycine) (1) and [Cu(2,2′-bpy)(Hsala)](NO3) · 2H2O(H2sala = N-(2-hydroxylbenzyl)-l-alanine) (2) were synthesized. Single crystal X-ray diffraction analysis indicated that both complexes showed helical chains arrangement of Cu(II) centers bridged by carboxyl groups. The magnetic measurements showed complex 1 exhibited ferromagnetic interaction while there was no interaction between the Cu(II) centers in complex 2. 相似文献
18.
《Polymer》2007,48(1):129-138
Two novel bismaleimide (BMI) monomers containing 1,3,4-oxadiazole, i.e., 5-tert-butyl-1,3-di[5-(4-maleimidophenyl)-1,3,4-oxadiazole-2-yl]benzene (Buoxd) and 4,4′-[5-(4-maleimidophenyl)-1,3,4-oxadiazole-2-yl]diphenyldimethylsilane (Sioxd), were designed, synthesized and copolymerized with 4,4′-bismaleimidodiphenylmethane (BMDM) to yield a new series of high-performance bismaleimide resins. Both monomers obtained are readily soluble in common organic solvents, such as dichloromethane and chloroform, enabling an easy solution processing. The thermal properties of the two monomers were carefully studied by the differential scanning calorimetry (DSC), optical microscopy and thermogravimetric analysis (TGA, simultaneous DSC). The BMI resins based on a mixture of Buoxd (or Sioxd) and BMDM in a weight ratio of 10% were prepared. DSC investigations showed that the thermal curing of the BMI resins could be accomplished at a lower temperature than the thermal curing temperatures of Buoxd and Sioxd, and the thermal processing window, i.e., the temperature range between the melting transition and thermal curing process, was over 26 °C. The thermal properties and thermal mechanical properties of the resulting BMI resins were investigated by DSC, thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). No glass transition temperature was found in the range of 50–350 °C, and very good thermal stability (Td > 490 °C in nitrogen) and high thermo-oxidative stability (Td > 460 °C in air) were revealed. Composites composed of the above BMI resins and glass cloth were also prepared, which showed high bending modulus (>1.6 GPa) at a very high temperature (e.g., 400 °C). 相似文献
19.
《Carbon》2015
Single electrode materials capable of both electric double-layer and Faradic redox-based pseudo capacitance can be used for fabrication of high performance supercapacitors in an easy way and thus are highly desirable in the energy storage field. This contribution reports a new kind of such materials based on alkylated graphene materials (CnrGO, n is the carbon number of their alkyl side chains) having different alkyl side chains (n = 4, 8, and 16). These materials were prepared via esterification of KOH-treated GO with the corresponding alkyl bromides in the presence of a phase transfer catalyst. More importantly, water was used as the reaction medium, and thus endowing the preparation method an eco-friend feature. The so-prepared graphene materials displayed chain length-dependent specific surface area and the population of residue CO functionalities, and thus affording vast differences in their supercapacitor behaviors. C4rGO, the product having butyl side chains, showed the best supercapacitor performance with a capacitance up to 242.2 F g−1 at a scan rate of 100 mV s−1 and a good cycling stability. 相似文献
20.
Guang-Fei Liu Ling-Ling Li Yu-Shu Ren Hong-Xi Li Zhi-Gang Ren Yong Zhang Jian-Ping Lang 《Inorganic chemistry communications》2009,12(6):563-565
Two 1D coordination polymeric isomers with the same chemical formula [Cu(2,2′-bipy)(Htda)]n (2,2′-bipy = 2,2′-bipyridine, Htda = 1,2,3-triazole-4,5-dicarboxylate) were solvothermally prepared and structurally characterized. X-ray analysis revealed that one isomer has a 1D staircase chain structure while the other possesses a 1D spiral chain structure. The electrochemical behaviors of both isomers in solution were also investigated by cyclic voltammetry. 相似文献