共查询到20条相似文献,搜索用时 15 毫秒
1.
Two novel Zn-based coordination polymer through employing of in-situ solvothermal techniques by using NO2-bdc (2-nitroterephthalic acid), HL1 = 1-(tetrazo-5-yl)-4-(triazo-1-yl)benzene, HL2 = 1-(tetrazo-5-yl)-4-(triazo-1-yl)benzene and Zn(NO3)2·6H2O to form [Zn2(HL1)2(NO2-bdc)]·0.5 (DMA)·CH3OH·H2O (1) and [Zn2(μ3-OH) (HL2)·(NO2-bdc)]·0.5 (DMA)·H2O (2). The structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. In Compound 1, each Zn ion bridges one NO2-bdc and two HL1 ligands to yield infinite 2D layers, furthermore the aromatic π –π interactions link the adjacent layers yielding a 3D supramolecular structure. In compound 2, the HL2 ligands link Zn ions to form a 2D Zn(HL) sheet firstly, and further connected by double NO2-bdc pillars resulting in bi-pillared-layer type 3D frameworks. Moreover, 1 and 2 are luminescent with blue emission (λem = 440 nm and λem = 417 nm) in the solid-state. The fluorescent nature of 1and 2 inspired us to explore its potential application as a sensor for the detection of nitro explosives. The result reveals that 1 and 2 could be applied as a fluorescence sensor for NB (nitrobenzene) and 1,3-DNB (1,3-dinitrobenzene) with sensitivity and selectivity. 相似文献
2.
In the utilization of three ditopic ligands with different bend angles as pillars, we reported herein three pillar-layered Zn–triazolate–carboxylate frameworks, namely, [Zn2(ATRZ)2(BDC)]n (1), [Zn2(ATRZ)2(TPDC)]n·2nDMF (2) and [Zn2(ATRZ)2(ADDC)]n (3) (ATRZ = 3-amino-1,2,4-triazole, H2BDC = 1,4-benzenedicarboxylic acid, H2TPDC = 2,5-thiophenedicarboxylic acid, and H2ADDC = 1,3-adamantanedicarboxylic acid). Single crystal structural analyses demonstrate that different geometries of ditopic carboxylate pillars not only result in Zn–ATRZ layers adopting various corrugated configurations, but also give rise to 3,4-connected self-interpenetrated net of 1 and non-interpenetrated nets of 2 and 3. All these compounds exhibit high thermal stability and blue photoluminescence. 相似文献
3.
Two mononuclear DyIII complexes [Dy(H2TEG)(NO3)3]·[18-crown-6] (H2TEG = triethylene glycol) (1) and [Dy(H2TEG)Cl3]·[18-crown-6] (2) have been prepared using H2TEG as ligands. Magnetic studies revealed that both complexes show field-induced double magnetic relaxation behavior with energy barriers of 28 K and 54 K. Distinct magnetic dynamic properties observed in 1 and 2 are mostly attributed to the dissimilar coordination environments around DyIII centers in these two complexes. 相似文献
4.
Two new coordination polymers [Co(TIPE)(H2O)2]·Hbtc·CH3CN·3H2O (1) and [Cd(TIPE)0.5(m-bdc)(H2O)]·CH3OH·H2O (2) (TIPE = tetra(3-imidazoylphenyl)ethylene, H3btc = 1,3,5-benzenetricarboxylate, m-H2bdc = 1,3-benzenedicarboxylate) have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR, TGA, and PXRD. Furthermore, the luminescent properties of complexes 1, 2 and TIPE ligand have also been investigated in the solid at room temperature. 相似文献
5.
An energetic material [Zn2(btzphda)2(H2O)4(dpp)2]·2DMF·4H2O with high decomposition enthalpy of − 748.35 J/g was prepared by the reaction of H2btzphda, dpp and Zn(NO3)2·6H2O under solvothermal conditions, where btzphda = 1,4-bis(tetrazol-5-yl)benzene-N2,N2′-diacetato, dpp = 1.3-di(4-pyridyl)propane and DMF = N,N′-dimethylformamide. The luminescence properties of H2btzphda and [Zn2(btzphda)2(H2O)4(dpp)2]·2DMF·4H2O were investigated at room temperature in the solid state (Hitachi F4600 spectrofluorometer). Furthermore, the thermal decomposition behavior of the compound is characterized by differential scanning calorimetry (DSC) and thermogravimetric-differential thermogravimetric (TG-DTG) analyses. The entropy of activation (ΔH), enthalpy of activation (ΔS) and the free energy of activation (ΔG) for the decomposition temperature were ΔH = 250.64 kJ/mol, ΔS = 222.75 J·mol− 1·K− 1 and ΔG = 134.10 kJ/mol. 相似文献
6.
Self-assembly reaction of Ln(NO3)3.6H2O, 2-aldehyde-8-hydroxyquinoline and histamine dihydrochloride affords two mononuclear complex [Ln(hma)(NO3)2(CH3OH)]∙0.5C4H10 (Ln = Tb (1), Dy (2); Hhma = N-(2-(8-hydroxylquinolinyl)methane(2-(4-imidazolyl)ethylamine)). The structural analysis indicates that they are isomorphous where the Ln3 + is ligated to one ligand, two nitrates and one methanol molecule. Variable temperature magnetic susceptibility studies reveal the presence of antiferromagnetic interactions in 2 and the dynamic measurement reveals that 2 displays single molecular magnet behavior below 10 K under an applied field of 2000 Oe. 相似文献
7.
Two novel homochiral helical Zn(II) coordination polymers, {[Zn2(nap-l-thr)2(H2O)2]·H2O}n (1) and {[Zn2(nap-d-thr)2(H2O)2]·H2O}n (2) (H2nap-l-thr = N-(2-hydroxy-1-naphthylmethylidene)-l-threonine, H2nap-d-thr = N-(2-hydroxy-1-naphthylmethylidene)-d-threonine) have been successfully synthesized and characterized by elemental analysis, IR, UV–visible and single-crystal X-ray diffraction. It is interesting to note that both complexes are a pair of enantiomers: 1 exhibits 1D right-handed helical chain of [Zn-COO−]∞ and 2 is 1D left-handed helical chain of [Zn-COO−]∞. There are various hydrogen bonds between the adjacent helical chains which result in a 2D homochiral supramolecular layer structure. Notably, under similar synthetic procedure by using the NO3−, CH3COO−, Cl− salts of Zn2 + ion as a starting reagent, and identical compounds were obtained. In addition, the chiral nature of complexes 1 and 2 are confirmed by the results of circular dichroism (CD) spectra measurements. Thermal stability and luminescence properties were also investigated. 相似文献
8.
With the help of a heterometallic approach, an unstable channel-type framework {[Cu4Cl(CPT)4]·(NO3)3·5DMF}n (1, HCPT = 4-(4H-1,2,4-triazol-4-yl)benzoic acid, DMF = N,N-Dimethylformamide) is structurally modified into a robust channel-type framework {[InCu(OH)(CPT)2]·(NO3)2·(DMF)4}n (2) via embedding independent indium-based units into the Cu(II)-organic framework, in which the 1D In(III)-chains and 1D Cu(II)-chains coexist. Although both MOFs have similar framework structures, the activated heterometallic MOF 2 exhibits a BET surface area of 1032 m2/g, which is extraordinary high compared with that of the activated 1. In addition, the gas sorption property of MOF 2 around room temperature has also been investigated. 相似文献
9.
The reaction of 2-hydroxyphenylpropanone oxime (Et-H2salox) with Mn(NO3)2·4H2O, NEt3 and 1,3-bis(4-pyridyl)propane-N,N′-dioxide (bppo) in EtOH/H2O mixture afforded a one-dimensional coordination polymer with the formula [Mn3O(Et-salox)3(bppo)(MeOH)(H2O)3](NO3)0.5(Et-Hsalox)0.5·MeOH·H2O (1·MeOH·H2O). 1·MeOH·H2O had a manganese triangle structure, [MnIII3O]7 +, which was used as a building unit for a subsequent assembly of an oximate and central oxide. The flexible bppo ligand linked the units, resulting in the formation of a 1D helical structure. Variable temperature direct current magnetic susceptibility measurements of complex 1·MeOH·H2O were carried out. Exchange interactions of the metal centers of complex 1·MeOH·H2O were examined, and the results indicate that both ferro- and antiferromagnetic interactions simultaneously coexist in 1·MeOH·H2O, resulting in an S = 2 ground state. Moreover, complex 1·MeOH·H2O shows the frequency dependence of the out-of-phase component in alternating current magnetic susceptibility measurements, indicating single-molecule magnet behavior with Ueff = 28 K and τ0 = 1.8 × 10− 9 s. 相似文献
10.
《Inorganic chemistry communications》2007,10(1):101-104
A novel supramolecular adduct of [C6N2(CB[6])]3 · [Zn(H2O)6]Cl2 · 14H2O (1) is reported, where C6N2 = N,N′-bis(2-pyridylmethyl)-1,6-diaminohexane, CB[6] = Cucurbit[6]uril. It consists of a CB[6]-based pseudo-rotaxane and a six-hydrated Zn(II) ion, and forms an infinite 2D network and 3D spatial structure by hydrogen bonding interactions. 相似文献
11.
《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
12.
The host and the apohost frameworks of Zn2(ndc)2(DMF)2 ∙(H2O)4 (1 ∙ DMF ∙ H2O) and Zn2(bdc)2(H2O)2 ∙(DMF)2 (2·H2O·DMF), (H2ndc = 2,6-naphthalene dicarboxylic acid, H2bdc = benzene-1,4-dicarboxylic acid and DMF = N,N-Dimethylformamide), were synthesized, characterized and subsequently used for preparing of ZnO nanoparticles. The morphology of initial precursors has direct influence on agglomeration tendency of resulting ZnO nanoparticles. Linkers and coordinated solvent molecules are the two effective factors on the formation of zinc oxide nanoparticles from these metal–organic frameworks. 相似文献
13.
《Inorganic chemistry communications》2008,11(11):1316-1319
Three solvent-induced pseudo-polymorphic bimetallic Zn–Nd complexes [ZnNdL(OAc)(NO3)2(DMF)] · solvate (solvate: MeCN (1), THF (2), EtOH (3); H2L = N,N′-bis(3-methoxy-salicylidene)phenylene-1,2-diamine) were obtained, and their solid NIR luminescence related to the packing structure from the intermolecular π–π interactions was discussed. 相似文献
14.
Jian-Di Lin Cui-Cui Jia Zhi-Hua Li Shao-Wu Du 《Inorganic chemistry communications》2009,12(6):558-562
Two supramolecular nickel-organic frameworks, [Ni(HBTC)(bix)]n (1) and [Ni3(BTC)2(mbix)3(H2O)4]n · 6nH2O (2) (bix = 1,4-bis(imidazole-l-yl-methyl)benzene, mbix = 1,3-bis(imidazole-l-yl-methyl)benzene, and H3BTC = 1,3,5-benzenetricarboxylate), have been hydrothermally prepared by the assembly of H3BTC, Ni2+ with bix or mbix. Compound 1 shows a 2D layer structure, whose 3D supramolecular structure exhibits a fsc topology when hydrogen-bonging interactions between the adjacent layers are taken into account. Compound 2 manifests an unprecedented 2D (3, 4)-connected topological net. The 3D supramolecular framework of 2 is formed through π?π stacking interactions between the adjacent layers. The magnetic studies show that 1 features overall ferromagnetic property whilst 2 presents strong zero-field splitting (ZFS) when treated as a mononuclear model. Furthermore, the IR and TGA properties of 1 and 2 were also studied. 相似文献
15.
Dinuclear iron(III) complexes, [(phenO)Fe(SO4)]2·2CH3OH (1) and [(bpmapO)Fe(NO3)]2(NO3)2·3CH3OH (2) have been prepared by the reaction of phenOH/bpmapOH and FeSO4·7H2O/Fe(NO3)3·9H2O in methanol, respectively (phenOH = N-(2-pyridylmethyl)-N′-(2-hydroxyethyl)ethylenediamine, bpmapOH = N-(bis(2-pyridylmethyl)amino)-2-methylpropan-2-ol). Both complexes are ethoxy-bridged dinuclear species and the iron(III) ions in 1 and 2 have distorted octahedral geometries. Both complexes show strong antiferromagnetic interactions through the bridged ethoxy groups within the dimeric units. 相似文献
16.
《Inorganic chemistry communications》2007,10(4):467-470
The complex [Cd2(phen)4(p-phth)(H2O)2](p-phth) · 10H2O (1) has been synthesized by the reaction Cd(NO3)2 with phen and p-phth (where phen = 1,10-phenanthroline, p-phth = p-phthalic acid) in a solution of ethanol and distilled water. The crystal structure was characterized by X-ray single-crystal diffraction and infrared spectrum. In 1, a novel 2D supramolecular structure was formed, containing water octamer and tetramer. 相似文献
17.
Four rare earth organodisulfonate coordination polymers, {[Tb2(phen)4(nds)3(H2O)2]·4H2O}n (1), {[Ln(phen)(nds)(OH)]}n[Ln = Sm (2), Nd (3)], {[Tb(phen)2(nds)0.5(OH)·H2O]·(nds)0.5}n (4), were synthesized under the solvothermal conditions by using ligands 2,6-naphthalenedisulfonate (L = nds) and 1,10-phenanthroline (L′ = phen). Single-crystal X-ray diffraction reveals that compounds 1 and 4 exhibit different 1-D and 2-D crystal structures just owing to the single difference of stoichiometric ratio of the reactants in the synthesis process. Compounds 2 and 3 show 3-D structures with similar Ln coordination mode. Besides, the photoluminescent property in solid state of 1 was investigated in detail. 相似文献
18.
A six connected 3D porous coordination polymer {[Cd(HBTC)(BPz)]·3EtOH}n (1) (H3BTC = benzene-1,3,5-tricarboxylic acid, BPz = 3,3′,5,5′-tetramethyl-4,4′-bipyrazole) has been synthesized from mild solvothermal reaction of Cd(NO3)2·4H2O with BPz and H3BTC in ethanol. Complex 1 is a thermally stable microporous MOF having (Cd2(COO)2) as the secondary building unit (SBU) with a six connected pcu topology. The pores of the polymer are decorated with free COOH groups which show moderate N2 sorption (38 cc g− 1) at 77 K with a BET surface area of 129 m2 g− 1. Complex 1 also exhibited photoluminescent property in solid state with λmax at 396 nm. 相似文献
19.
Jing-cai Yao Jin-bo Guo Jian-ge Wang Yu-fang Wang Li Zhang Cui-ping Fan 《Inorganic chemistry communications》2010,13(10):1178-1183
Two new 3d-4f complexes, [LnCo(3,5-pdc)2(3,5-Hpdc) (H2O)7]·H2O (Ln = Gd 2, La 3; 3,5-pdcH2 = pyridine-3,5-dicarboxylic acid), have been synthesized by the self-assembly of Ln(III) oxides, 3,5-pdcH2 and the template molecule [Co(3,5-pdc)(H2O)5]·H2O (1) under hydrothermal conditions. Heterometallic complexes 2 and 3 are isostructural with supracyclic units containing four Ln(III) ions and two Co(II) ions, in which Co(II) and Ln(III) are linked by the deprotonated 3,5-pdcH2 ligands in three kinds of bridging modes. The weak antiferromagnetic coupling of complex 2 and 3 imply that the large 3,5-pdc bridges with the greater separation ( > 7 Å) cannot lead to long range magnetic ordering, the strength of dn-fn exchange coupling increasing with decreases the size of the lanthanide ion. 相似文献
20.
《Inorganic chemistry communications》2007,10(10):1218-1221
Four new lanthanide coordination polymers {[Ln(HL)2(H2O)5] · HL · H2O}n (Ln = Sm for 1, Eu for 2, Tb for 3 and Dy for 4) (H2L = 6-hydroxynicotinic acid) have been synthesized and characterized by elemental analysis, FT-IR spectra and X-ray single-crystal diffraction. They all exhibit 1D chain structure, which are further linked via hydrogen bonds to form 3D supramolecular architecture. Luminescent properties of these lanthanide coordination polymers are studied. 相似文献