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1.
Qiang Li Hui‐Ting Wang 《Acta Crystallographica. Section C, Structural Chemistry》2014,70(11):1054-1056
A new cadmium dicyanamide complex, poly[tetramethylphosphonium [μ‐chlorido‐di‐μ‐dicyanamido‐κ4N1:N5‐cadmium(II)]], [(CH3)4P][Cd(NCNCN)2Cl], was synthesized by the reaction of tetramethylphosphonium chloride, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution. In the crystal structure, each CdII atom is octahedrally coordinated by four terminal N atoms from four anionic dicyanamide (dca) ligands and by two chloride ligands. The dicyanamide ligands play two different roles in the building up of the structure; one role results in the formation of [Cd(dca)Cl]2 building blocks, while the other links the building blocks into a three‐dimensional structure. The anionic framework exhibits a solvent‐accessible void of 673.8 Å3, amounting to 47.44% of the total unit‐cell volume. The cavities in the network are occupied by pairs of tetramethylphosphonium cations. 相似文献
2.
Wei Shi Jian‐Jun Liu Xiang‐Ping Ou Chang‐Cang Huang 《Acta Crystallographica. Section C, Structural Chemistry》2015,71(4):289-293
A homochiral helical three‐dimensional coordination polymer, poly[[(μ2‐acetato‐κ3O,O′:O)(hydroxido‐κO)(μ4‐5‐nicotinamido‐1H‐1,2,3,4‐tetrazol‐1‐ido‐κ5N1,O:N2:N4:N5)(μ3‐5‐nicotinamido‐1H‐1,2,3,4‐tetrazol‐1‐ido‐κ4N1,O:N2:N4:N5)dicadmium(II)] 0.75‐hydrate], {[Cd2(C7H5N6O)2(CH3COO)(OH)]·0.75H2O}n, was synthesized by the reaction of cadmium acetate, N‐(1H‐tetrazol‐5‐yl)isonicotinamide (H‐NTIA), ethanol and H2O under hydrothermal conditions. The asymmetric unit contains two crystallographically independent CdII cations, two deprotonated 5‐nicotinamido‐1H‐1,2,3,4‐tetrazol‐1‐ide (NTIA−) ligands, one acetate anion, one hydroxide anion and three independent partially occupied water sites. The two CdII cations, with six‐coordinated octahedral and seven‐coordinated pentagonal bipyramidal geometries are located on general sites. The tetrazole group of one symmetry‐independent NTIA− ligand links one of the independent CdII cations into 61 helical chains, while the other NTIA− ligand links the other independent CdII cations into similar but unequal 61 helical chains. These chains, with a pitch of 24.937 (5) Å, intertwine into a double‐stranded helix. Each of the double‐stranded 61 helices is further connected to six adjacent helical chains through an acetate μ2‐O atom and the tetrazole group of the NTIA− ligand into a three‐dimensional framework. The helical channel is occupied by the isonicotinamide groups of NTIA− ligands and two helices are connected to each other through the pyridine N and carbonyl O atoms of isonicotinamide groups. In addition, N—H...O and O—H...N hydrogen bonds exist in the complex. 相似文献
3.
Qiang Li 《Acta Crystallographica. Section C, Structural Chemistry》2015,71(1):65-68
The title compound, (C20H20P)[Cd(C2N3)3], consists of ethyltriphenylphosphonium (EtPh3P+) cations filling voids in a three‐dimensional anionic cadmium dicyanamide network. In the structure, each CdII atom is connected to six neighbouring CdII atoms through six separate dicyanamide ligands, forming cube‐shaped cages. The three‐dimensional anionic network encloses a solvent‐accessible void space of 1851 Å3, amounting to 69.3% of the unit‐cell volume. Each cage accommodates only one EtPh3P+ cation. 相似文献
4.
Three‐dimensional fractal structure of the electrodeposited cadmium layer was investigated. The results suggested that the fractal growth begin with nanometer scale aggregate within which the atoms arrange in hexagonal close‐packed lattice (the normal cadmium lattice). The fractal structure is correlated to the current density. The higher the current density is, the larger the size of fractal growth will be. Fractal structures can emerge in both the complete diffusion‐limited process and the combination‐limited process of the electrochemical reaction and diffusion. The fractal structure obtained from the simple hydrated ion electrolyte is different from that obtained from the complex ion electrolyte, which indicates they grow in different modes. The fractal dimensionality of deposit from the simple hydrated ion electrolyte is 2.592, smaller than that (2.608) from the complex ion electrolyte. 相似文献
5.
《Acta Crystallographica. Section C, Structural Chemistry》2017,73(11):869-873
In the development of coordination‐driven crystalline materials, O‐ and N‐atom donors from carboxylate and pyridyl‐based ligands are widely used classes of multidentate bridging ligands composed of several terminal coordinating groups linked by either rigid or flexible spacers. The rigidity of the ligands can play a vital role in the determination of the structures formed. A new CdII supramolecular compound, namely poly[μ‐adipato‐κ2O 1:O4‐μ‐adipato‐κ4O 1,O 1′:O 4,O4′‐diaquabis[μ‐1,4‐bis(pyridin‐4‐yl)‐1,3‐butadiene‐κ2N :N ′]dicadmium(II)], [Cd2(C6H8O4)2(C14H12N2)2(H2O)2]n , (I), has been synthesized by the self‐assembly of Cd(NO3)2·4H2O, adipic acid (hexane‐1,6‐dioic acid; H2adp) and the dipyridyl ligand 1,4‐bis(pyridin‐4‐yl)buta‐1,3‐diene (1,4‐bpbd) under hydrothermal conditions. Single‐crystal X‐ray diffraction analysis reveals that each CdII centre is located in a distorted octahedral coordination environment, coordinated by one water O atom, three carboxylate O atoms from two different adp2− ligands and two N atoms from two different 1,4‐bpbd ligands. The Cd(H2O) units are interconnected by the μ2,κ2‐adp2−, μ2,κ4‐adp2− and 1,4‐bpbd ligands, which lie across centres of inversion, to give a 66‐ dia network. Large cavities within a single diamondoid network permit the mutual threefold interpenetration of crystallographically equivalent frameworks. Hydrogen‐bonding interactions between the coordinated water molecules and adp2− carboxylate O atoms anchor the interpenetrating networks into a unique three‐dimensional supramolecular structure. Topologically, taking the coordinated water molecules and CdII centres as nodes, the whole architecture can be simplified as a binodal (3,7)‐connected supramolecular framework. The identity of (I) was further characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis and powder X‐ray diffraction. The solid‐state photoluminescence properties of (I) were also investigated. 相似文献
6.
Suna Wang Daqi Wang Jianmin Dou Dacheng Li 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(5):m141-m144
In the coordination compound poly[diaqua(μ2‐4,4′‐bipyridine)(μ2‐4‐carboxylatocinnamato)nickel(II)], [Ni(C10H6O4)(C10H8N2)(H2O)2]n, both the 4‐carboxylatocinnamate and 4,4′‐bipyridine (4,4′‐bpy) ligands act as bidentate bridges, connecting the NiII centres in an octahedral coordination geometry into a two‐dimensional (4,4) layer. Each layer polycatenates two other identical layers, thus giving a rare 2D → 3D polycatenating network (2D and 3D are two‐ and three‐dimensional, respectively), with a mutually parallel arrangement of the layers. The chiral 4,4′‐bpy ligands link the NiII centres into chiral chains, thus introducing chirality into the layer and the resulting 3D network. 相似文献
7.
Hind A. Maouel Vronique Alonzo Thierry Roisnel Houria Rebbah Eric Le Fur 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(7):i36-i38
The title synthesized hypophosphite has the formula V(H2PO2)3. Its structure is based on VO6 octahedra and (H2PO2)− pseudo‐tetrahedra. The asymmetric unit contains two crystallographically distinct V atoms and six independent (H2PO2)− groups. The connection of the polyhedra generates [VPO6H2]6− chains extended along a, b and c, leading to the first three‐dimensional network of an anhydrous transition metal hypophosphite. 相似文献
8.
Jan Janczak Genivaldo Julio Perptuo 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(3):o121-o122
The title compound, 2C6H8NO+·SeO42−·2H2O, contains 4‐hydroxyanilinium cations, selenate(VI) anions and water molecules. One of the two independent cations is nearly planar (excluding the ammonium H atoms), while the other is markedly nonplanar, with the hydroxy and ammonium groups displaced from the plane of the benzene ring. This results from the antiparallel orientation of the cations, which interact through oppositely polarized ammonium and hydroxy groups. Ionic and hydrogen‐bonding interactions join the oppositely charged units into a three‐dimensional network. This work demonstrates the usefulness of 4‐aminophenol in the crystal engineering of organic–inorganic hybrid compounds. 相似文献
9.
Yan Zhou Wen‐Na Zhao Lei Han 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(6):o287-o289
The title compound, 4,4′‐(1,1,1,3,3,3‐hexafluoroisopropylidene)diphthalic acid hexahydrate, C19H10F6O8·6H2O, crystallizes in the centrosymmetric space group Pbcn, with half of the diphthalic acid residue and three water molecules in the asymmetric unit. The organic molecule is located on a crystallographic twofold axis. In the solid, cyclic water hexamers in chair conformations have crystallographically imposed inversion symmetry. Strong O—H...O hydrogen bonds between the hexamers and organic molecules result in a unique three‐dimensional supramolecular network [O...O = 2.554 (2)–2.913 (2) Å]. This compound represents the first example of a (3,4,4,10)‐connected four‐nodal supramolecular topology with the Schläfli symbol (43.5.6.7)2(43.52.7)2(43)2(46.56.62.78.814.99). 相似文献
10.
《Acta Crystallographica. Section C, Structural Chemistry》2018,74(8):889-893
As a class of multifunctional materials, crystalline supramolecular complexes have attracted much attention because of their unique architectures, intriguing topologies and potential applications. In this article, a new supramolecular compound, namely catena‐poly[4,4′‐(buta‐1,3‐diene‐1,4‐diyl)dipyridin‐1‐ium [(μ4‐benzene‐1,2,4,5‐tetracarboxylato‐κ6O1,O1′:O2:O4,O4′:O5)cadmium(II)]], {(C14H14N2)[Cd(C10H2O8)]}n or {(1,4‐H2bpbd)[Cd(1,2,4,5‐btc)]}n, has been prepared by the self‐assembly of Cd(NO3)2·4H2O, benzene‐1,2,4,5‐tetracarboxylic acid (1,2,4,5‐H4btc) and 1,4‐bis(pyridin‐4‐yl)buta‐1,3‐diene (1,4‐bpbd) under hydrothermal conditions. The title compound has been structurally characterized by IR spectroscopy, elemental analysis, powder X‐ray diffraction and single‐crystal X‐ray diffraction analysis. Each CdII centre is coordinated by six O atoms from four different (1,2,4,5‐btc)4− tetraanions. Each CdII cation, located on a site of twofold symmetry, binds to four carboxylate groups belonging to four separate (1,2,4,5‐btc)4− ligands. Each (1,2,4,5‐btc)4− anion, situated on a position of symmetry, binds to four crystallographically equivalent CdII centres. Neighbouring CdII cations interconnect bridging (1,2,4,5‐btc)4− anions to form a three‐dimensional {[Cd(1,2,4,5‐btc)]2−}n anionic coordination network with infinite tubular channels. The channels are visible in both the [10] and the [001] direction. Such a coordination network can be simplified as a (4,4)‐connected framework with the point symbol (4284)(4284). To balance the negative charge of the metal–carboxylate coordination network, the cavities of the network are occupied by protonated (1,4‐H2bpbd)2+ cations that are located on sites of twofold symmetry. In the crystal, there are strong hydrogen‐bonding interactions between the anionic coordination network and the (1,4‐H2bpbd)2+ cations. Considering the hydrogen‐bonding interactions, the structure can be further regarded as a three‐dimensional (4,6)‐connected supramolecular architecture with the point symbol (4264)(42687·84). The thermal stability and photoluminescence properties of the title compound have been investigated. 相似文献
11.
Green conversion of three‐dimensional organometallic [Ag2(μ6‐tp)]n ( 1 ) coordination polymer (CP) nanosheets, prepared by sonochemical procedure, to three‐dimensional organometallic [Ag2(μ4‐tp)(apy)2]n ( 2 ) (where H2tp = terephthalic acid and apy = 2‐aminopyridine) CP nanoparticles has been observed upon solid‐state mechanochemical reaction of compound 1 with 2‐aminopyridine. The AgO3 Ag ···C6 coordination sphere of silver ion in 1 changed to NO2 Ag ···C coordination sphere in 2 during this mechanochemical addition. These samples were characterized by infrared spectroscopy, thermogravimetric and differential thermal analyses, X‐ray powder diffraction and scanning electron microscopy. 相似文献
12.
Shu‐Juan Fu Ching‐Yuan Cheng Kuan‐Jiuh Lin 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(8):m368-m370
The structure of poly[caesium(I) [(μ4‐ethylenediphosphonato)cobalt(II)]], {Cs[Co(C2H5O6P2)]}n, reveals a three‐dimensional polymeric open framework consisting of tetrahedral CoII atoms coordinated by four different ethylenediphosphonate O atoms and intermolecular O—H...O hydrogen bonds. The largest open window is made of corner‐sharing CoO4 and PO3C tetrahedra, giving 16‐membered rings of dimensions 9.677 (5) × 4.684 (4) Å2. There are two independent ethylenediphosphonate ligands, each lying about an inversion centre. 相似文献
13.
《International journal of quantum chemistry》2018,118(19)
The solution of three‐dimensional Schrödinger wave equations of the hydrogen atoms and their isoelectronic ions (Z = 1 − 4) are obtained from the linear combination of one‐dimensional hydrogen wave functions. The use of one‐dimensional basis functions facilitates easy numerical integrations. An iteration technique is used to obtain accurate wave functions and energy levels. The obtained ground state energy level for the hydrogen atom converges stably to −0.498 a.u. The result shows that the novel approach is efficient for the three‐dimensional solution of the wave equation, extendable to the numerical solution of general many‐body problems, as has been demonstrated in this work with hydrogen anion. 相似文献
14.
Poly[(μ4‐pyrazine‐2,5‐dicarboxylato)cadmium(II)], [Cd(C6H2N2O4)]n or [Cd(pzdc)]n (pzdc is the pyrazine‐2,5‐dicarboxylate dianion), has been synthesized hydrothermally. The asymmetric unit consists of a CdII atom and two independent halves of pzdc ligands that can be expanded via inversion through the centres of the ligands so that each ligand binds to four CdII atoms with the same binding mode using six donor atoms. The CdII centre is in a distorted octahedral coordination geometry with four O‐ and two N‐atom donors from four pzdc ligands. The infinite linkage of the metal atoms and ligands forms a three‐dimensional framework with a rectangular channel which is so narrow that there is no measurable void space in the overall structure. This coordination polymer represents the first example of (4,4,4)‐connected three‐nodal framework. 相似文献
15.
Zhi‐Hui Zhang Jin‐Long Wang Ning Gao Ming‐Yang He 《Acta Crystallographica. Section C, Structural Chemistry》2014,70(7):668-671
The novel title organic salt, 4C5H7N2+·C24H8O84−·8H2O, was obtained from the reaction of perylene‐3,4,9,10‐tetracarboxylic acid (H4ptca) with 4‐aminopyridine (4‐ap). The asymmetric unit contains half a perylene‐3,4,9,10‐tetracarboxylate (ptca4−) anion with twofold symmetry, two 4‐aminopyridinium (4‐Hap+) cations and four water molecules. Strong N—H...O hydrogen bonds connect each ptca4− anion with four 4‐Hap+ cations to form a one‐dimensional linear chain along the [010] direction, decorated by additional 4‐Hap+ cations attached by weak N—H...O hydrogen bonds to the ptca4− anions. Intermolecular O—H...O interactions of water molecules with ptca4− and 4‐Hap+ ions complete the three‐dimensional hydrogen‐bonding network. From the viewpoint of topology, each ptca4− anion acts as a 16‐connected node by hydrogen bonding to six 4‐Hap+ cations and ten water molecules to yield a highly connected hydrogen‐bonding framework. π–π interactions between 4‐Hap+ cations, and between 4‐Hap+ cations and ptca4− anions, further stabilize the three‐dimensional hydrogen‐bonding network. 相似文献
16.
《Journal of Polymer Science.Polymer Physics》2018,56(6):479-483
Poly(para‐phenylene vinylene) (PPV) is a key material for optoelectronics because it combines the potential of both polymers and semiconductors. PPV has been synthesized via solution‐processable precursor route, in which the precursor polymer poly(xylene tetrahydrothiophenium chloride) (PTHT) is thermally converted to PPV throughout the sample as a whole. Much effort has been devoted to fulfill spatial selectivity of PPV conversion. However, none of the methods proposed stand for PPV conversion three dimensionally, which would be appealing for the design of microdevices. Here, we demonstrate the potential of fs‐laser direct writing via two‐photon polymerization (2PP) to fabricate PPV‐doped 3D microstructures. PTHT is incorporated into the polymeric material and it is subsequently converted to PPV through a thermal treatment. Optical measurements, taken prior and after thermal conversion, confirm the PTHT to PPV conversion. Fs‐laser direct writing via 2PP can be exploited to fabricate a variety of 3D microdevices, thus opening new avenues in polymer‐based optoelectronics. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56, 479–483 相似文献
17.
George Ferguson Christopher Glidewell 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(4):452-454
The title compound, N‐hydroxypropanamide, C3H7NO2, crystallizes with Z′ = 3 in P21/c. The molecules are linked by three N—H?O hydrogen bonds [N?O 2.8012 (16) to 2.8958 (15) Å; N—H?O 163 to 168°] and by three O—H?O hydrogen bonds [O?O 2.6589 (15) to 2.6775 (17) Å; O—H?O 165 to 177°] into a single three‐dimensional framework. 相似文献
18.
Kai Sun Mike S. Dadachov Tony Conradsson Xiaodong Zou 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(9):1092-1094
A new three‐dimensional open‐framework germanate, namely ethylenediamine bis(ethylenediammonium) tetrahydroxooctadecaoxononagermanate, (C2H8N2)(C2H10N2)2[Ge9O18(OH)4], has been synthesized hydrothermally and its structure determined by single‐crystal X‐ray diffraction. The framework is built of [Ge9O22(OH)4] units formed by four‐, five‐ and six‐oxygen‐coordinated germanium and templated by ethylenediamine. Three types of intersecting channels are formed in the framework, one by eight‐membered rings running along the b axis and the other two by ten‐membered rings running parallel to the a and c axes, respectively. 相似文献
19.
The size of “bowl‐like” structures woven by nanofibers could be controlled by adjusting the distance from the nozzle to a modified collector and the voltage applied to the electrospinning device. More interestingly, the nanofibers in the side wall of the “bowl” could vibrate up and down with the changing of the voltage. This voltage‐induced vibration might have potential applications for bio‐mimic process and micro‐motor devices. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
20.
Sophia Lipstman Israel Goldberg 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(10):m371-m373
In the complex diaquatetranitrato[5‐(pyridinium‐4‐yl)‐10,15,20‐tri‐4‐pyridylporphyrin]lanthanum(III) 1,2‐dichlorobenzene trisolvate, [La(NO3)4(C40H27N8)(H2O)2]·3C6H4Cl2, the lanthanum ion is coordinated to one of the peripheral pyridyl substituents of the porphyrin entity. Units of the complex are interlinked to one another in three dimensions by a network of O—H...N, O—H...O and N—H...O hydrogen bonds between the water ligands, nitrate ions, and pyridyl and pyridinium groups of adjacent species. This is the first structural report of an exocyclic complex of the tetrapyridylporphyrin ligand with any lanthanide ion and its self‐assembly into a three‐dimensional architecture sustained by hydrogen bonds. 相似文献