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1.
Hydrothermal reactions of PbCl2 with two positional isomers of asymmetric zwitterionic ligands 1-carboxylatomethylpyridinium-3-carboxylate (HL3) and 1-carboxylatomethyl-pyridinium-4-carboxylate (HL4) result in the formation of two coordination polymers (CPs) [Pb(L3)Cl] (1) and [Pb1.5(L4)2Cl(H2O)] (2), respectively. CPs 1 and 2 were characterized by elemental analysis, IR, powder X-ray diffraction, and single-crystal X-ray diffraction. 1 and 2 exhibit the 2D (4,4)-connected and 3D (3,4,4,5)-connected novel topological networks with (43.62.8) and (42.124)(42.6)2(43.6.84.102)2(46)2 point symbols, respectively, which reveal the significant positional isomeric effect of the zwitterionic ligands on the construction of CPs. Their thermal and photoluminescent properties were also investigated. 相似文献
2.
Two novel Cd2 + based coordination compounds based on two isomeric double betaine ligands (1,4-Bis(4-carboxylatopyridinium-1-methylene)benzene (H2L1Cl2) and 1,4-Bis(3-carboxylatopyridinium-1-methylene)benzene (H2L2Cl2)) were synthesized, structurally and optically characterized. Both compounds show two dimensional sheet architectures with different features depending on structural motifs that ranging from helical chain to linear chain, and the spatial arrangements of coordinated ligands as well as their unlike coordination modes. They further exhibit the way how three dimensional supramolecular isomers form via weak interactions. Meanwhile, two compounds exhibit intense fluorescence attributing to the ligands' emissions with stokes shift. 相似文献
3.
Two coordination polymers based on a flexible desymmetric ligand precursor H2L have been synthesized, that is, [Ni(L)(dpe)3/2] H2O (1), [Ni2(H2O)(L)2(bpp)2] H2O (2), [H2L = 4,4′-(phenylazanediyl)dibenzoic acid, dpe = 1,2-di(pyridin-4-yl)ethane, bpp = 1,3-di(pyridin-4-yl)propane]. These complexes were characterized by elemental analysis, IR spectroscopy, X-ray single-crystal and power diffraction. In addition, the second nonlinear optical properties of 2 were measured. 相似文献
4.
《Inorganic chemistry communications》2003,6(8):1152-1155
A copper(II) complex {[Cu(H2btc) (H2O)3]2(H4btc)(C5H11N)2 · 3H2O}n (1) has been synthesized and characterized structurally (H4btc=1,2,4,5-benzenetetracarboxylic acid). Open channels were formed and can accommodate piperidine molecules. TGA data show that guest water and piperidine molecules are lost at 130 °C. 相似文献
5.
A new cadmium(II) coordination polymer [Cd2(L)2(bpy)]n·nCH3OH (1) (H2L = 2-(3-oxo-3-phenylpropionyl)-6-pyridinecarboxylic acid N-oxide, bpy = 4,4′-bipyridine), has been synthesized from the reaction of H2L, 4,4′-bipyridine with CdSO4·8/3H2O. Compound 1 is an exceptional non-interpenetrating three-dimensional framework and contains double helical chains and rare cross bpy configuration. Interestingly, these helical chains can span two different directions on other alternate layers. Compound 1 shows intense photoluminescence at room temperature. 相似文献
6.
《Inorganic chemistry communications》2007,10(5):575-579
Two Cu(II)–fluconazole supramolecular isomers 1 and 2 formulated as (flu)2Cu(SCN)2 (flu = fluconazole) have been synthesized and structurally characterized by single crystal X-ray diffraction. Different solvent media lead to the different binding modes of anion SCN− and the flexible C–C chain of fluconazole has been rotated in the two isomers. Complex 1 exhibits a two dimensional square grid-like layer and complex 2 exhibits a two dimensional framework with a parquet motif. Different H-bonds and stacking modes are observed in the two isomers. Complex 1 is nonemissive, whereas complex 2 exhibits photoluminescence property. 相似文献
7.
8.
Two new coordination polymers, [Co3(μ7-CTA)(bipy)(μ3-OH)2(μ2-H2O)]·3H2O (1) and [Mn2(μ6-CTA)(bipy)(H2O)2]·H2O (2), have been prepared by a flexible cyclohexane-1,2,4,5-tetracarboxylic acid (H4CTA) with a chelating co-ligand, 2,2’-bipyridine (bipy). Complex 1 is a two-dimensional (2D) structure based on unusual hexanuclear cluster (Co6) nodes and CTA linkers, while 2 exhibits a 1D chain based on dinuclear cluster (Mn2) units and CTA linkers. Structural analysis revealed that the conformation of H4CTA in 1 exhibits a (a,e,e,a) fashion and transforms to a thermodynamically more stable conformation (e,a,e,e) type in 2. 1 and 2 showed antiferromagnetic interactions. 相似文献
9.
Zi-Yi Du Yu-Hui Sun Yong-Rong Xie Jing Lin He-Rui Wen 《Inorganic chemistry communications》2010,13(1):77-80
Two isomeric cadmium(II) diphosphonates built up from corner-sharing CdO6 octahedra and CPO3 tetrahedra, with the same formula of [Cd(H3L)2] (H4L = (CH3)2N–CH(PO3H2)2), have been synthesized and structurally characterized. Compound 1 shows a 1D chain structure in which the adjacent Cd2+ ions are doubly bridged by two equivalent H3L? anions, whereas compound 2 exhibits a novel non-centrosymmetric 3D framework which is formed by a pillared-layer array, with one type of H3L? anions participating in the construction of a 21-symmetry layer and the other type of H3L? anions acting as pillars. 相似文献
10.
Reactions of two isomeric ligands, 5-(n-pyridyl)tetrazole-2-acetato potassium salt (Kn-pytza, n = 2,4) and PrCl3·6H2O under solvothermal conditions, afforded three new complexes, [Pr(2-pytza)(SO4)(H2O)3]·H2O(1), [Pr(4-pytza)3(H2O)2]·2H2O (2) and [Pr4(4-pytza)5(OH)4(H2O)7Cl]Cl2·4H2O (3), whose structures are controlled by not only the different positions of the nitrogen atom of the pyridine ring but also the pH value of the solvent system. These compounds have been characterized by elemental analysis, IR and single crystal X-ray diffraction. The X-ray analysis reveals that compound 1 is a two dimensional layer structure made up of a Pr2O6 binuclear unit and the tridentate bridging SO42 − ligand; compound 2 is an unusual one dimensional ladder like chain structure consisting of a Pr2O10 binuclear unit and 4-pytza which acts as a tetradentate ligand via the pyridine-N and the carboxylate group in a μ1,1,3-COO bridging mode while compound 3 is an unprecedented two dimensional network composed of a tetranuclear cubane-shaped Pr4(OH)48 + cluster (SBU) and tridentate 4-pytza via the pyridine-N and the carboxylate group in a μ1,3-COO bridging mode. Various hydrogen bonds exist to assemble the 1D chains or 2D layers into 3D supramolecular network structures. Furthermore, the luminescence properties investigated at room temperature in the solid state show only intraligand emission for 1 and both intraligand and characteristic peaks of Pr3 + for either compound 2 or 3. 相似文献
11.
Two novel Cd(II) coordination frameworks based on a semirigid asymmetric ligand L and aromatic multi-carboxylate ligands, {[Cd2L(btc)(H2O)2]·5H2O}n (1) and [Cd2L2(bdc)]n (2) (L = (4-((2-(pyridine-2-yl)-1H-imidazol-1-yl)methyl)benzoic acid, H3btc = 1,3,5-benzenetricarboxylic acid, H2bdc = 1,3-benzenedicarboxylic acid), have been hydrothermally synthesized, and structurally characterized by elemental analysis, IR spectroscopy, single-crystal X-ray crystallography. Due to various coordination modes and conformations of the semirigid asymmetric ligand, and carboxylate containing co-ligands, therefore, the two complexes exhibit structural and dimensional diversity. Complex 1 exhibits a novel 2D (3, 5)-connected network structure with (3·52)(32·53·64·7) topology. Complex 2 exhibits a novel 3D CdSO4 topology, which is formed from different dinuclear cadmium units. In addition, the photoluminescence properties of the free ligand L, and complexes 1 and 2 were studied in the solid state at room temperature. 相似文献
12.
Reactions of Zn(II) salts, presynthesized 5-(4-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (HIPT) and various carboxylate ligands result to three new coordination polymers (CPs), namely, [Zn2[(IPT)2(ox)]}n (H2ox = oxalic acid, 1), [Zn2(IPT)2(mNBDC)]n (H2mNBDC = 5-nitroisophthalic acid, 2), and [Zn2(IPT)(CA)(H2O)]n (H3CA = citric acid, 3). Compound 1 can be seen as constructed from 2D [Zn(IPT)]n layers with (6,3) topology and pillared by ox2 −. It is a 3D (3,4)-connected framework with InS topology. Compound 2 has 2D bilayer structure based on 2D [Zn(IPT)]n single layer and mNBDC2 − linkers. Compound 3 is a 3D pillar-layer framework built by Zn–CA bilayers and IPT− pillars. The results showed that the coordination modes, configurations of IPT−, and the structure of carboxylate co-ligands have great influence on the structures of the final network. The choice of carboxylate can decide the result of CPs in Zn–IPT chains/net subunits plus carboxyl linkers or Zn–carboxylate chains/net subunits plus IPT− linkers. The thermal stabilities and luminescent properties of selected compounds have also been studied. 相似文献
13.
Three Cu(II) coordination polymers: [Cu(XL)(NO3)2]n (1), {[Cu(XL)(4,4′-bpy)(NO3)2]·CH3CN}n (1a) and {[Cu(XL)3](NO3)2·3.5H2O}n (2) have been synthesized mainly based on a novel bi-triazole ligand N,N′-bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxdiimide bi(1,2,4-triazole) (XL) and characterized by X-ray crystallography, EPR spectra, elemental analyses, FT-IR spectra and PXRD patterns. Structure analyses reveal that compounds 1 and 1a exhibit 1D chains, and compound 2 features a 2D cationic framework. Additionally, the Cu(II) ions with various coordination environment in compounds 1, 1a and 2 exhibit different EPR properties. 相似文献
14.
Reactions of Cd(II) with three new pyridyl-tetrazole-bifunctional ligands, 3-(4-(1H-tetrazol-5-yl)phenyl)pyridine (HL1), 4-(3-(1H-tetrazol-5-yl)phenyl)pyridine (HL2), and 3-(3-(1H-tetrazol-5-yl)phenyl)pyridine (HL3) resulted in three Cd(II) coordination polymers (CPs), namely, [CdL12]n (1), [CdL22]n (2), and [CdL32(H2O)]n (3). Although the geometry of L1 and L2 is quite different, the coordination modes of Cd(II) ion and ligand, as well as the SBUs in compounds 1 and 2 are quite similar, thus give rise to 3D frameworks with same (3,6)-connected ant topology. Compound 3 is a 3D framework composed of 1D helical chains and features as (3,5)-connected tcj topology. The results showed that the topologies are largely dependent on the coordination angle between two coordination groups. The thermal stabilities and luminescent properties of compounds 1–3 have also been studied. 相似文献
15.
Under hydrothermal conditions, a new polynuclear Cu(II) complex, [Cu2(nip)(ina)(μ3-OH)]2·H2O (1) (H2nip = 5-nitroisophthalic acid, Hina = isonicotinic acid) has been synthesized with mixed organic ligands. Single crystal X-ray analysis reveals that complex 1 displays a three-dimensional (3D) structure based on the tetranuclear Cu4 units. In the structure of 1, two pairs of symmetry-related Cu(II) ions are connected by six carboxyl and two μ3-OH groups to generate the tetranuclear Cu4 units, which are connected by the mixed ligands into a 3D framework. Topology analysis reveals a (3,8)-connected tfz-d net for 1. Magnetic studies display antiferromagnetic behavior for 1. And thermogravimetric analysis of 1 has also been investigated. 相似文献
16.
Na Zhang Qing-Yan Liu Yu-Ling Wang Zeng-Mei Shan Er-Lei Yang Hai-Chun Hu 《Inorganic chemistry communications》2010,13(6):706-710
Two coordination polymers, namely, [Co(IM)6][Co2(SIP)3] (1) (IM = imidazole, H3SIP = 5-sulfoisophthalic acid) and [BMIM]2[Cd2(SIP)3] (2) (BMIM = 1-n-butyl-3-methylimidazolium) were synthesized in ionothermal reactions by using ionic liquid 1-n-butyl-3-methylimidazolium tetrafluoroborate as solvent. Single-crystal X-ray analyses revealed that 1 has an anionic 1D polymeric chain charge balanced by an uncommon [Co(IM)6]2+ cation. Complex 2 features an anionic 2D layer containing unique tetranuclear [Cd4(CO2)6(SO3)2] cluster wherein the four Cd atoms are co-planar. The imidazolium cation [BMIM]+ of the ionic liquid acting as charge compensating agent intercalated into the [Cd2(SIP)2]2n? interlayers in structure 2. The rich ionic environments of the ionic liquid may be particularly helpful in the formation of the anionic frameworks of 1 and 2. 相似文献
17.
Peng Ren Na Xu Chen Chen Hai-Bin Song Wei Shi Peng Cheng 《Inorganic chemistry communications》2008,11(7):730-732
1D cobalt(II) and nickel(II) coordination polymers {[Co(dba)(H2O)4] · H2O}n (1) and {[Ni(dba)(H2O)4] · H2O}n (2) (H2dba = 2,5-dihydroxy-p-benzenediacetic acid) were synthesized under low temperature solvothermal condition. When 4,4′-bipyridine (bpy) was introduced to the synthetic systems of 1 and 2, respectively, two novel 2D coordination polymers {[Co(dba)(bpy)] · 0.5H2O}n (3) and [Ni(dba)(bpy)(H2O)2]n (4) with different structures were obtained. All of the compounds were characterized by elemental analysis, FT-IR, UV–Vis spectra and single crystal X-ray diffraction. 相似文献
18.
The cobalt(II)–lanthanide(III) heteronuclear complexes [Ln(H2O)4Co2(TTHA)(SCN)2]·H3O+ (H6TTHA = triethylenetetraaminehexaacetic acid, Ln = La(2), Ce(3)) have been synthesized based on a binuclear building block of [Co2(H2TTHA)(H2O)2] in [Co2(H2TTHA)(H2O)2]·4H2O (1). Single-crystal structures show that complex 1 is a binuclear complex, containing the [Co2(H2TTHA)(H2O)2] unit as a useful building block. Adding the La3 + and Ce3 + ions to this synthesis system, two new 3d-4f mixed complexes 2 and 3 were obtained. Complexes 2 and 3 show 3D framework, comprising an infinite 1D (one-dimensional) chain based on heterometallic Ln2Co2 (Ln = La(2), Ce(3)). Further investigations such as IR spectra, UV–vis spectra, TGA, XRD and magnetic properties were studied. 相似文献
19.
Xi Lin Tianfu Liu Jingxiang Lin Hongxun Yang Jian Lü Bo Xu Rong Cao 《Inorganic chemistry communications》2010,13(3):388-391
Two new pillared-layer frameworks have been obtained through self-assembly of 4,4′-azobenzene dicarboxylatic acid (4,4′-H2ABDC), oxalate, hydroxyl and LnCl3(Ln = Sm, Eu) under hydrothermal environment and characterized by TGA, IR spectroscopy, element analyses, and X-ray single crystal diffraction. The X-ray structure analyses reveal that the oxalates link the Ln(III) to form metal layers, and 4,4′-ABDC ligands work as pillars to connect adjacent layers to further extend into 3D frameworks. Their magnetic studies show that the two compounds have typical anti-ferromagnetic behaviors. 相似文献
20.
Two Pb(II) coordination polymers constructed from dicarboxamido-(2-pyridyl)-pyridine by varying ratios of mixed solvents 总被引:1,自引:0,他引:1
Hong Xu Zhenyu Chao Yali Sang Hongwei Hou Yaoting Fan 《Inorganic chemistry communications》2008,11(12):1436-1440
Through varying the volume ratio of mixed solvent, we obtained two distinct polymers {[Pb6(2,6-pda)6] · H2O}n (1) (2,6-pda = 2,6-pyridyldicarboxylate) and [Pb(mpcp)(OAc)]n (2) (mpcp = methyl-6-(pyridin-2-ylcarbamoyl)picolinate) by reaction of Pb(OAc)2 · 3H2O and 2,6-dicarboxamido-(2-pyridyl)-pyridine (H2dcapp) decomposed through lead-induced hydrolysis. Photoluminescence investigations reveal that both polymers display enhanced emissions in contrast to the free ligand, respectively. 相似文献