共查询到20条相似文献,搜索用时 0 毫秒
1.
《Journal of Coordination Chemistry》2012,65(6):1062-1070
Two coordination polymers, {[Mn(1,10-phen)2(3,4-H2bptc)]?·?(H2O)}2 n (1) and {[Co2(1,10-phen)(3,4-bptc)(H2O)2]?·?H2O} n (2) (3,4-H4bptc = 3,3′,4,4′-biphenyltetracarboxylic acid, 1,10-phen?=?1,10-phenanthroline), have been prepared and structurally characterized. In both compounds, 3,4-H2bptc2– and 3,4-bptc4? exhibit different coordination modes and lead to various architectures. Compound 1 displays 1-D zigzag chains constructed with hydrogen bonds. Compound 2 exhibits a 2-D layer constructed from bpta4? between the dinuclear Co(II) units. The thermal stabilities and magnetic properties are also reported. In addition, 1 was explored as a luminescent material. The carboxylic oxygen atoms act as H-bond acceptors and donors forming a 1-D ladder-like arrangement. 相似文献
2.
《Journal of Coordination Chemistry》2012,65(5):754-762
Three new supramolecular coordination polymers based on 2,2′-bipyridyl-3,3′-dicarboxylic acid (H2BPDC) and Mn(II), Fe(II), and Zn(II) were synthesized under hydrothermal conditions and characterized with single-crystallographic X-ray analysis and IR spectrum. Complex 1 exhibits a 1-D, chain-like structure, which is further connected to 2-D supramolecular layer structure through hydrogen bonds. Complex 2 exhibits a 3-D supramolecular structure constructed from 1-D chains through hydrogen bonds and π–π interactions. Like 1, 3 also shows 2-D supramolecular layer structure based on 1-D chains. Furthermore, the fluorescence of 3 was studied. 相似文献
3.
《Journal of Coordination Chemistry》2012,65(2):232-243
Three complexes constructed with 2,2′-biphenyldicarboxylic acid, multidentate nitrogen donors, and metal salts, {[Cd(2,2′-dpdc)(tppp)(H2O)]2?·?2H2O} n (1), {[Pb(2,2′-dpdc)(pyphen)]2} n (2), and {[Pb(2,2′-dpdc)(dppz)]} n (3) (H2dpdc = 2,2′-diphenyldicarboxylic acid; tppp = 4-(1H-1,3,7,8-tetraazacyclopenta[l]phenanthren-2-yl)phenol; pyphen?=?pyrazino[2,3-f]-[1,10]phenanthroline; and dppz = dipyrido[3,2-a:2′,3′-c]phenazine), are synthesized under hydrothermal conditions. These complexes are characterized by single-crystal X-ray diffraction, elemental analysis, IR, TGA, and photoluminescence. In 1, two 2,2′-dpdc ions bridge two Cd(II) ions to form an isolated cluster with Cd?···?Cd distance of 5.023(4)?Å. These clusters are further linked by intermolecular hydrogen bonds, yielding a 2-D supramolecular structure. Complex 2 contains two crystallographically independent Pb(II) ions in the asymmetric unit. Pb1 ions are bridged by 2,2′-dpdc anions to form a chain along the x-axis. Two Pb2 ions are coordinated by two 2,2′-dpdc anions and two pyphen ligands to form a cluster. These clusters are linked by π–π interactions to yield a 1-D supramolecular chain along the y-axis. In 3, neighboring Pb(II) atoms are bridged by 2,2′-dpdc anions to form a 1-D chain structure. Further, the chains are linked into a 3-D supramolecular network through aromatic π–π interactions. 相似文献
4.
Shi Xu Yia Jian Mena Xiao Yan Mab Yan Jianga Guo Wei Gao a College of Chemistry Sichuan University Chengdu China b College of Material Chemical Engineering Chengdu University of Technology Chengdu China 《中国化学快报》2009,(3)
A novel approach to the synthesis of 2,2′,3,3′-biphenyltetracarboxylic dianhydride is described.The target compound was prepared by a nickel-catalyzed coupling reaction of dimethy 3-chlorophthalate(3-DMCP) for 4 h at 70-80℃,followed by subsequent hydrolysis of tetra-ester in acid solution and dehydration of tetra-acid,with overall yield of 68%.The structures of the products were characterized by IR,~1H NMR and ~(13)C NMR respectively. 相似文献
5.
《Journal of Coordination Chemistry》2012,65(13):2378-2387
New iron(III) and cobalt(III) complexes, [Fe(2,2′-dpdtc)3], [Fe(3,3′-dpdtc)3], [Co(2,2′-dpdtc)3], and [Co(3,3′-dpdtc)3] (dpdtc?=?dipicolyldithiocarbamate) have been synthesized and their molecular structures and spectroscopic properties determined. The 2,2′- and 3,3′-dpdtc ligands have four donors, S, S′, N, and N′. These complexes are insoluble in water, but soluble in acidic solution. Crystal structures of these metal complexes reveal that the central metal ions have MS6 (M?=?Fe and Co) octahedral structures and all dipicolyl groups do not coordinate. 相似文献
6.
《Journal of Coordination Chemistry》2012,65(16):2877-2892
A series of transition metal (Zn, Cu, Mn) complexes with chelidamic acid (2,6-dicarboxy-4-hydroxypyridine, H3CAM) and 4,4′-bipyridine (bipy), [Zn2(bipy)Cl2] n (1), {[Zn2(HCAM)(H2CAM)2]?·?(bipy)?·?3.5H2O} n (2), [Mn3(HCAM)3(H2O)7]?·?(bipy)?·?3H2O (3), [Mn2(HCAM)2(bipy)?·?(H2O)2]?·?4H2O (4), [Cu2(HCAM)2(bipy)?·?(H2O)2]?·?4H2O (5), and Cu2(HCAM)2(bipy)?·?(H2O)2 (6), have been synthesized by hydrothermal or solution methods and characterized by single-crystal X-ray diffraction. The structural analyses reveal that 1 exhibits a zigzag chain of Zn(II), Cl?, and 4,4′-bipyridine. In 2, a 1-D polymeric [Zn2(HCAM)(H2CAM)2] n chain and a discrete 4,4′-bipyridine assemble into a 2-D supramolecular network via H-bonds. Complex 3 consists of asymmetric units of Mn3(HCAM)3(H2O)7 that are linked by hydrogen bonds to form a 2-D H-bonded network. Complexes 4–6 are isomorphous and possess discrete structures. The photoluminescent properties of 1–6 at room temperature were studied. 相似文献
7.
《Journal of Coordination Chemistry》2012,65(24):4342-4352
Two supramolecular compounds based on Keggin-type polyoxometalates (POMs), (4,4′-H2bpy)(4,4′-Hbpy)[PMo12O40] (1) and (4,4′-H2bpy)(4,4′-Hbpy)2[SiW12O40]?·?4H2O (2), have been synthesized hydrothermally and characterized by elemental analyses, IR, UV-Vis, XPS spectra, thermogravimetric analyses, and single-crystal X-ray diffraction analyses. The two compounds consist of 4,4′-bipyridine (4,4′-bpy) ligands and different Keggin-type POMs which are [PMo12O40]3? for 1 and [SiW12O40]4? for 2. There are hydrogen-bonding interactions between the POMs, 4,4′-bipyridine, and/or water in 1 and 2. In addition, 2 contains an uncommon (H2O)2 water cluster. 相似文献
8.
With the goal of improving processability of imide oligomers and achieving high toughness of thermosetting polyimides, a series of 4-phenylethynylphthalic anhydride(PEPA)-terminated imide oligomers prepared by the reaction of 2,3,3',4'-diphenyl ether tetracarboxylic acid dianhydride(a-ODPA) and 3,4'-oxydianiline(3,4'-ODA) with different molecular weights(degree of polymerization: n = 1?9) were formed. The resultant oligomers with different molecular weights were characterized for their chemical architecture, cure behavior, thermal properties, solubility in organic solvents and rheological characteristics. Besides, the thermal properties and tensile test of cured polyimide films were also evaluated. The imide oligomer(degree of polymerization: n = 1) has some somewhat crystalline phase, and imide oligomers(degree of polymerization: n = 2?9) showed excellent solubility(40 wt%) in N-methyl-2-pyrrolidone(NMP) and N,Ndimethylacetamide(DMAc) at room temperature. Furthermore, the rheological properties of imide oligomers showed very low melt viscosity and wider processing window. The cured films exhibited good thermal properties with the glass transition temperatures of 282?373 ?C and 5 wt% thermal decomposition temperatures higher than 551 ?C in nitrogen atmosphere. The elongation at break of the prepared films was found to be high(almost 9.3%). 相似文献
9.
《Tetrahedron: Asymmetry》2004,15(23):3805-3810
X-ray diffraction analysis revealed unexpected stereochemical features accompanying crystal self-assembly of the two title oligocarboxylic acids. 相似文献
10.
Wen-Jie Zhao Jin-Ting Tan Xia Li Ying-Li Lu Xing Feng Xu-Wu Yang 《Chemical Papers》2014,68(10):1415-1420
Two complexes, {Zn(bptc)0.5(bib)} n (I) and {Mn2(bptc)(pip)(H2O)} n (II) (H4bptc = biphenyl-3,3′,5,5′-tetracarboxylic acid; bib = 1,4-bis(2-methylimidazol-1-yl)butane; pip = 2-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline) were synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR, TGA and solid fluorescence spectra. The results show that I and II both have 3D network architectures. I has porous architecture with a 162 topology structure. Effective porosity calculated by Platon is 5.5 %. Moreover, it has a two-fold interpenetrating structure allowed by a 70.73° torsion between the benzene rings of the bptc4? ligand and the flexibility of bib. II has a tetranuclear structure composed of binuclear architecture units with the torsion of 43.44° between the benzene rings of the bptc4? ligand. TGA shows that the skeletons of I and II are stable up to 372°C and 553°C, respectively. I exhibits fluorescence. 相似文献
11.
《Polyhedron》1986,5(9):1479-1482
In the absence of a competing anion, [La(DTPA)]2− was extracted from aqueous phases in the pH ranges 1–3 by the perchlorate salt of the primary amine Primene JM-T. The addition of small amounts of SO2−4 to the aqueous phases depressed the extraction of La to near zero. As the SO2−4 concentration was increased further, DLa increased to values greater than that found in the absence of SO2−4; this was caused by a change in the mechanism of extraction and [La(SO4)2]− became the extracted species. 相似文献
12.
S. A. AbouEl-Enein 《Journal of Thermal Analysis and Calorimetry》2008,91(3):929-936
Cobalt(II), nickel(II) and copper(II) complexes of Schiff’s bases derived from 4,4′-methylenedianiline and pyridine-2-carboxaldehyde(L1), furan-2-carboxaldehyde(L2) or thiophene-2-carboxaldehyde(L3), were prepared and characterized by different analytical and spectral methods. The Schiff bases behave as neutral tetradentate
ligands. The chloro-complexes of (L2) with (2:3) mole ratio have a polymeric nature. However, that of L1 and L3 with (1:1) mole ratio showed a sandwich structure. All complexes display an octahedral geometry, except complex (2) which
has a tetrahedral one. O
h/T
d equilibrium for chloro-complexes of cobalt with ligand L1 was established in the solid state. ESR spectra of solid copper(II) complexes showed isotropic and axial type with dx
2-y
2 ground state. The thermal study showed that the complexes with different solvents of crystallization exercise different types
of interaction. The observed thermochromic phenomenon for cobalt complex was explained along with its thermal behaviour. 相似文献
13.
14.
《Tetrahedron: Asymmetry》2003,14(21):3343-3346
Racemic 3,3′,4,4′-tetramethyl-1,1′-diphosphaferrocene-2-carboxaldehyde 1 was resolved via the formation of diastereomeric dioxolanes with (S)-(+)-1-phenyl-1,2-ethanediol. Four stereoisomers were separated by column chromatography. The absolute configuration of one of them (2′′R, 4′′S,1R) was established by X-ray diffraction. Acid hydrolysis of the dioxolanes afforded quantitatively (R)- and (S)-enantiomers of 1. Optical rotatory dispersion (ORD) spectra of both enantiomers are also reported. 相似文献
15.
《Tetrahedron: Asymmetry》2001,12(4):533-534
(±)-3,3′4,4′-Tetramethyl-1,1′-diphosphaferrocene-2-carboxylic acid 1 was resolved via diastereomeric salts with brucine. The (R)-absolute configuration of (+)-1 was determined by X-ray crystallography. 相似文献
16.
17.
《Journal of Coordination Chemistry》2012,65(14):2573-2582
Two new transition metal coordination polymers, [Zn(abz)(bipy)](ClO4) (1) and [Mn(bipy)5(H2O)6](ClO4)2?·?2(abz)?·?2(H2O) (2) (bipy?=?4,4′-bipyridine, abz?=?3-aminobenzoate), were prepared and characterized by elemental analysis, FTIR spectroscopy, and single-crystal X-ray diffraction. Complex 1 is a 2-D-layered network with a (4,4) net built up by bipy and 3-aminobenzoate ligands connecting two zinc nodes. Complex 2 is a 3-D supramolecular grid network constructed from close stacking bipy ligands of H-type cation units with large cavities hosting 3-aminobenzoate, perchlorate ions, and water. Solid state photoluminescence for 1 was also investigated. 相似文献
18.
Kostiantyn V. Domasevitch Harald Krautscheid 《Acta Crystallographica. Section C, Structural Chemistry》2024,80(5):166-176
Poly-stoichiometry of hydrated phases is relatively uncommon for organic materials and extended libraries of such species adopting different aqua-to-substrate ratios are still rare. The kinetically controlled higher hydrates could be particularly interesting for their structural relationships, which presumably may imprint some features of the substrate/substrate and aqua/substrate bonding in solutions, and provide insights into the nucleation stage. Two metastable high hydrates are prepared by crash crystallization. The crystal structures of 3,3′,5,5′-tetranitro-4,4′-bipyrazole tetrahydrate, C6H2N8O8·4H2O, (1), and 3,3′,5,5′-tetranitro-4,4′-bipyrazole pentahydrate, C6H2N8O8·5H2O, (2), are intrinsically related to the previously reported anhydrate and monohydrate, while displaying natural evolution of the patterns upon progressive watering. The accumulation of the water molecules causes their clustering, with the generation of one-dimensional tapes and two-dimensional layers in the genuine channel hydrates (1) and (2), respectively, versus the pocket hydrate structure of C6H2N8O8·H2O. The hydration primarily affects the pyrazole sites. It conditions the emergence of N—H…O and O—H…N hydrogen bonds, which is a destructive factor for pyrazole/pyrazole N—H…N hydrogen bonding. At the same time, extensive noncovalent interactions of the organic molecules, namely, lone pair–π-hole O…N interactions of the NO2/NO2 and NO2/pyrazole types, are more competitive to the hydrogen bonding and the motifs of mutual organic/organic stacks remain intact with the increase in hydration. These trends agree with the results of Hirshfeld surface analysis. The contributions of the contacts involving H atoms are increased in line with the growing number of water molecules, while the fraction of O…N/N…O (NO2) contacts is nearly invariant. One may postulate the significance of the lone pair–π-hole interactions to the aggregation of nitro species in solutions and their relevance for the sebsequent development of the solid-state patterns through nucleation. 相似文献
19.
《Journal of Coordination Chemistry》2012,65(8):1299-1308
Two new coordination polymers, [Zn(H2btc)(4,4′-bpy)2] n (1) and {[Cd(H2btc) (terpy)]?·?H2O} n (2) (H4btc?=?biphenyl-2,2′,4,4′-tetracarboxylic acid, 4,4′-bpy?=?4,4′-bipyridine, terpy?=?terpyridine), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. Complexes 1 and 2 are 1-D chains linked through partially deprotonated H4btc. The adjacent 1-D chains of 1 are further formed into 2-D supramolecular architecture through inter-chain N–H···O hydrogen bonds. In contrast, due to a different auxiliary ligand, the 1-D chains of 2 are further extended into 3-D supramolecular framework through inter-chain O–H···O hydrogen bonds. Thermal stabilities and luminescence of 1 and 2 were also studied. 相似文献
20.
由间二氯苯合成了热安定性炸药3,3′-二氨基-2,2′,4,4′,6,6′-六硝基二苯胺钾,目标化合物和部分中间体经元素分析,HNMR和MS表征,总收率58%。 相似文献