A Porous Cadmium(II) Framework: Synthesis,Crystal Structure,Gas Adsorption,and Fluorescence Sensing Properties

The Cd^II compound, namely [Cd(Tppa)(SO₄)(H₂O)]_n ( 1 ) [Tppa = tris(4‐(pyridyl)phenyl) amine], was synthesized by the reaction of CdSO₄ · 8H₂O and Tppa under solvothermal conditions. Single crystal X‐ray diffraction analysis revealed that compound 1 features a 3D porous framework based on 1D inorganic –[Cd–SO₄–Cd]_n– chains. Topological analysis reveals that compound 1 represents a trinodal (3,4,6)‐connected topological network with the point symbol of {6.7²}₂{6⁴.7.10}{6⁴.7⁵.8⁴.10²}. Gas adsorption properties investigations indicate that compound 1 exhibits moderate adsorption capacities for light hydrocarbons at room temperature. Luminescencence property studies revealed that this Cd^II compound exhibits high fluorescence sensitivity for sensing of CS₂ molecule.     

(3,4)‐Connected Twofold Interpenetrated Network with Right‐ and Left‐Handed Helical Chains: Synthesis,Crystal Structure,and Luminescence Sensing

The zinc(II) coordination polymer Zn₂(L)₂(bix)₂ · 2H₂O ( 1 ) [H₂L = 4,4′‐methylenebis(oxy)dibenzoic acid, bix = 1,4‐bis(imidazole‐1‐yl‐methylene)‐benzene] was synthesized by hydrothermal reaction. The title compound was characterized by single‐crystal X‐ray diffraction analysis, IR spectroscopy, and elemental analysis. The crystal structure determination reveals that compound 1 displays a twofold interpenetrated 3D framework, in which the Zn atoms are connected by the H₂L ligands into interesting right and left‐handed helical chains. Topological analysis reveals that the title compound displays a (3,4)‐connected (6³) (6⁵ · 8) topology. The solid‐state luminescent spectra was studied. Furthermore, the dispersed solution of compound 1 in DMF exhibits strong fluorescent emission, which could be quenched by trace amount of nitrobenzene.     

Synthesis and Structure of Lithium Cadmium Selenite Hydroxide,LiCd2(SeO3)2(OH)

The new compound LiCd₂(SeO₃)₂(OH) has been hydrothermally synthesized and characterized by single‐crystal X‐ray diffraction and IR spectroscopy. It is built up from a network of edge‐ and vertex‐sharing pyramidal [SeO₃]^2— groups, distorted CdO₆ octahedra, and CdO₇ monocapped trigonal prisms. The cadmium‐centred groups form infinite columns, onto which Se atoms (as [SeO₃]^2— groups) are grafted. Cross‐linking between the columns results in a three‐dimensional framework which encapsulates [100] channels occupied by the tetrahedrally‐coordinated lithium cations. The H atom of the hydroxyl group appears to participate in a weak, bifurcated, hydrogen bond. Crystal data: LiCd₂(SeO₃)₂(OH), M_r = 502.67, monoclinic, P2₁/c (No. 14), a = 5.8184 (3)Å, b = 10.2790 (5)Å, c = 11.5021 (5)Å, β = 90.446(1)°, V = 687.89 (9)ų, Z = 4, R(F) = 0.021, wR(F²) = 0.046.     

2D Compound Constructed by Cu3 Units with Mixed Azido and Tetrazole Double Bridges: Synthesis,Structure, and Theoretical Study on Magnetic Properties

The two‐dimensional (2D) layer Cu^II compound [Cu₃(L)₂(N₃)₄] ( 1 ) [L = 2‐amino‐3‐(5‐tetrazole)‐methyate‐N‐pyridine] was synthesized by in‐situ hydrothermal reaction of CuCl₂ · 2H₂O, NaN₃, and 3‐(5‐tetrazole)‐methyate‐N‐pyridine. The central Cu1 and Cu2 atoms are located in five‐coordinate and six‐coordinate arrangements, respectively. Three Cu^II ions are linked by mixed double EO (end‐on)‐azido‐tetrazole bridges to give trinuclear Cu^II clusters, which are further extended by EE (end‐to‐end) azido bridges to form 2D metal‐organic layers. The magnetic exchange interactions in complex 1 were investigated by DFT calculations, and the calculated exchange interaction (J = –849 cm^–1) revealed that the double EO‐azido‐tetrazole bridges transmit antiferromagnetic coupling between Cu^II ions.     

Synthesis,characterization, and fluorescence properties of dinuclear cadmium(II) complexes

Four dinuclear cadmium(II) complexes, [Cd₂(L¹)(μ₂-Cl)Cl₂] (1), [Cd₂(L²)(μ₂-Cl)Cl₂] (2), [Cd₂(L³)(μ₂-Cl)Cl₂] (3), and [Cd₂(L⁴)₃ClO₄] (4), where HL¹ = 4-methyl-2,6-bis(1-(2-piperidinoethyl)iminomethyl)-phenol, HL² = 4-methyl-2,6-bis(1-(2-pyrrolidinoethyl)iminomethyl)-phenol, HL³ = 4-methyl-2,6-bis(1-(2-morpholinoethyl)iminomethyl)-phenol and HL⁴ = 4-methyl-2,6-bis(cyclohexylmethyl)iminomethyl)-phenol, were synthesized. They were characterized by elemental analysis, FT-IR, UV–Vis, fluorescence and electronspray ionization mass spectroscopy. Complexes 1 and 4 were also characterized by single crystal X-ray analysis. The cadmiums atoms in 1 are linked by μ₂-chloride in a distorted square pyramidal geometry, whereas cadmium atom in 4 is in a distorted octahedral environment. The complexes show emission bands around 500 nm with excitation at 395 nm.     

Synthesis, Crystal Structure and Photoluminescent Property of a 3D Hydrogen-bonded Supramolecular Compound with Large Channels

The title compound, [Pd（2,2′-bipy）2]（Haadip）2·4H2O, was synthesized via the hydrothermal reaction of PdCl2 with 5-aminodiacetic isophthalic acid （H4adip） in an acetic acid water solution. It was characterized by elemental analysis and infrared spectrum. Crystal data for C44H44N6O20Pd： monoclinic, space group P21/n, a = 11.0674（2）, b = 9.9716（2）, c= 20.5770（3）A, β = 92.7300（3）°, V = 2268.29（7）A^3, Z = 2, Mr = 1083.25, Dc = 1.586 g/cm^3, F（000） = 1112,μ = 0.499 mm^-1, 2（MoKa） = 0.71073 A, T = 293（2） K, 2θmax = 51.38°, GOOF = 1.067, R = 0.0268 and wR = 0.0710 for 3770 reflections with 1 〉 2σ（I）. X-ray diffraction studies reveal that the title compound has an interesting 3D microporous architecture via hydrogen bonds with the cations located inside the channel.     

Synthesis,crystal structures and fluorescence of cadmium(II) coordination polymers with derivatives of pyrazine-1,4-dioxide and thiocyanate as mixed-bridging ligands

Two Cd(II) coordination polymers have been synthesized with derivatives of pyrazine-1,4-dioxide and thiocyanate anion as bridging ligands and structurally determined by X-ray crystallography. Complex 1, [Cd(μ_1,3-SCN^?)₂(μ_1,6-L1)] _n (L1?=?2,5-dimethylpyrazine-1,4-dioxide), belongs to the triclinic, space group P 1 with a?=?5.7627(18)?Å, b?=?7.182(2)?Å, c?=?7.509(2)?Å, α?=?74.042(3)°, β?=?84.766(4)°, γ?=?88.162(4)°; complex 2, [Cd₂(μ_1,3-SCN^?)₄(μ₄-L2)] _n (L2?=?2,3,5,6-tetramethylpyrazine-1,4-dioxide), crystallizes in a monoclinic system with space group C2/m with a?=?10.194(4)?Å, b?=?13.491(6)?Å, c?=?8.140(3)?Å, β?=?120.372(4)°. Complex 1 shows a two-dimensional sheet structure, and in a direction the Cd(II) ions were coordinated by μ_1,3-SCN^? forming the one-dimensional chain and the L1 bridging ligand made the chains connect in the c direction leading to formation of a two-dimensional sheet on the ac plane. For 2 the one-dimensional chains in the a axis were constructed by coordination of μ_1,3-SCN^? bridging ligands with the Cd(II) ions, and in b and c directions the chains were joined by L2 bridging ligands leading to a three-dimensional structure. In 2 L2 displays a μ₄-bridging coordination mode. Both complexes exhibit strong fluorescence emission.     

Synthesis,crystal structure and fluorescence of a two-dimensional Cd(II) coordination polymer with thiocyanato and 4-methylpyridine N -oxide as bridging ligands

A two-dimensional coordination complex [Cd(μ_1,3-SCN)₂(μ₂-mpdo)] _n (mpdo?=?4-methylpyridine N-oxide) has been synthesized and structurally determined by X-ray crystallography. The complex crystallizes in the triclinic space group of Pī with a?=?8.2589(14)?Å, b?=?8.5409(14)?Å, c?=?9.7947(16)?Å, α?=?70.022(2)°, β?=?74.338(2)°, γ?=?71.530(2)°. Each Cd(II) is coordinated by four μ_1,3-SCN^? forming a zigzag chain and then two μ₂-mpdo monodentate ligands coordinate to two adjacent Cd(II) ions leading to a two-dimensional sheet structure along the ab plane, and in the c direction the sheets stack parallel through π–π interactions and giving a three-dimensional structure. The complex exhibits a strong fluorescent emission spectrum in the solid state.     

芳香基苯并咪唑衍生物的合成、表征及抑菌活性研究

在微波辐射下,通过二茂铁磺酰氯和相应的苯并咪唑合成了4种芳香基苯并咪唑衍生物。经^1H NMR、MS及元素分析确证产物结构。通过X线衍射测定了化合物4a的晶体结构。用琼脂稀释法测定化合物抑菌活性,并与对照药剂50%多菌灵可湿性粉剂比较,结果表明化合物4a～4d对番茄早疫病菌、烟草赤星病菌和小麦赤霉病菌有与对照药剂近似的抑菌活性。     

三维无机-有机杂化微孔化合物Mn3(BTC)2(DMF)4的合成与结构

传统的沸石和分子筛微孔晶体材料是指以硅酸盐、硅铝酸盐、磷铝酸盐和无机金属磷酸盐为骨架的晶体材料．近年来,利用刚性和热稳定性较好的有机分子(如芳香多酸和多碱)和金属离子作为结构单元制备出了新型的无机一有机杂化微孔晶体材料．这类晶体材料能够在去除孔道中的溶剂分     

Synthesis, Structure Characterization and Biological Activity of Adenine Salt of 12-Phosphotungstic Acid

IntroductionOwingtothegreatpotentialoftheapplicationsofpolyoxometalatesasdrugsagainsttumorsandviruses ,theircomplexeshaveattractedanincreasinginterestofbothinorganicchemistsandbiochemists[1,2 ] .Inthelastfewyears ,thenumberofreportsinthelitera tureaddressingtheuseofpolyoxometalatesasantivi ralandanti tumoragents[3— 5] mounteduprapidly .However ,many polyoxometalatestestedshowtheloweractivityinvivothanthatinvitro .Inordertoimprovetheefficacyofthedrugs ,itisconsideredtomodifythepolyoxoanionfram…     

YVO4:Eu发光材料的合成、结构与荧光性——推荐一个大学综合实验

This comprehensive experiment is recommended for the synthesis, structure and fluorescence properties of YVO₄:Eu photoluminescent materials. The main purpose of this experiment is to introduce the research of fluorescent materials, including the synthesis of materials, structure characterization and fluorescence measurement. Students can master the basic principle and operation of instruments, the method for material synthesis, and luminescence properties of the materials. While mastering the basic theory and the basic experimental skills, the experimental ability and creative consciousness, especially their ability to use knowledge comprehensively, can be cultivated and improved. The distance between teaching and scientific research is shortened.     

一个新的二氮六元杂环化合物的合成、结构及表征

二氮杂环化合物及其衍生物在配合物的自组装和生物无机等领域中具有诱人的研究前景,因而引起各国化学家的广泛关注．这类化合物的合成可以追溯到60年前,Buhle等首次合成了1,5-二氮环辛烷(DACO)．随后,其一系列衍生物也被合成出来,并应用于配位化学及相关领域的研     

Synthesis and Crystal Structure of Diaqua bis(4‐amino‐3‐methyl‐1, 2, 4‐triazol‐5‐thione)cadmium(II) Nitrate

The reaction of 4‐amino‐5‐methyl‐1, 2, 4‐triazol‐3(2H)‐thione (HAMTT, 1 ) with cadmium(II) acetate in ethanol leads to [Cd(η²‐AMTT)₂(H₂O)₂] ( 2 ); the reaction of 2 with nitric acid in ethanol produces the single‐crystals of [Cd(η²‐HAMTT)₂(H₂O)₂](NO₃)₂ ( 3 ). 2 and 3 have been characterized by IR, Raman, ¹H NMR spectroscopy and elemental analyses; furthermore, 3 has been determined by single‐crystal X‐ray diffraction studies. 3 crystallizes in the space group Pbcn, orthorhombic with the lattice dimensions at —80 °C; a = 1604.2(1), b = 895.6(1), c = 1266.5(3) pm, Z = 4, R₁= 0.0276, wR₂= 0.0722.     

Synthesis,Crystal Structure,and Fungicidal Activity of a Novel 1,2,3-Thiadiazole Compound

Abstract

A new 1,2,3-thiadiazole compound, C₁₈H₁₈Cl₂N₄O₂S, has been synthesized and the crystal structure was determined by single crystal X-ray diffraction study. The fungicidal activity of the title compound was determined and the results showed that it displays moderate fungicidal activity.

Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.     

三维无机-有机杂化微孔化合物[Zn3(BTC)2(H2O)3]n的合成与结构

传统的沸石和分子筛微孔晶体材料是指以硅酸盐、硅铝酸盐、磷铝酸盐和无机金属磷酸盐为骨架的晶体材料^[1,2].     

Syntheses,structures, and properties of two 2-D Cd(II) complexes based on 2-(1H-imidazol-1-methyl)-1H-benzimidazole and polycarboxylate ligands

Two 2-D Cd(II) complexes, {[Cd(imb)(bdc)(H₂O)]·CH₃OH}_n (1) and {[Cd(imb)(Hbtc)(CH₃OH)]·2H₂O·CH₃OH}_n (2), have been synthesized by reactions of CdCl₂·2.5H₂O with 2-(1H-imidazol-1-methyl)-1H-benzimidazole (imb) and 1,3-benzenedicarboxylic acid (H₂bdc) or 1,3,5-benzenetricarboxylic acid (H₃btc). Single-crystal X-ray diffraction shows that 1 possesses an infinite 2-D layered structure in which all the carboxylates chelate Cd(II) and imb bridge Cd(II) ions. Complex 2 also features an infinite 2-D layered structure and imb ligands also bridge Cd(II) ions, but two carboxylates of each 1,3,5-benzenetricarboxylate coordinate to Cd(II) in monodentate or chelating mode, leaving the third one, which is not deprotonated, uncoordinated. IR spectra, fluorescent properties, and thermogravimetric analyses of both complexes have been investigated.     

Synthesis,crystal structure,and fluorescence properties of several schiff-base compounds

Two new Schiff-base compounds, 1,6-bis(4-dimethylaminobenzyl)-2,5-diaza-1,5-hexadiene (bdh), 1,4-bis(4-dimethylaminobenzyl)-2,3-diaza-1,3-butadiene (bdb), and a silver complex of the latter ([Ag₂(bdb)₃(NO₃)₂]·H₂O, 1) have been synthesized and characterized. The crystal structure of complex 1 was determined. 1 is a dinuclear complex, with the silver ions lying in coordination tetrahedra formed by two nitrogen atoms from the bdb ligands and two oxygen atoms from the nitrate anions. The fluorescence properties of bdh and bdb were studied; the fluorescence of bdb was quenched by the addition of silver ions, indicating that it is a potential fluorescent reagent for the analysis of silver.     

Syntheses,Structures and Luminescent Properties of 2D and 3D Cadmium(II) Coordination Polymers Derived from Two Isomeric Perchlorinated Benzenedicarboxylates

The coordination polymers {[Cd(o‐BDC‐Cl₄)(H₂O)₂]·EtOH}_n ( 1 ) and {[Cd(p‐BDC‐Cl₄)(DMF)]·H₂O}_n ( 2 ) (o‐BDC‐Cl₄ = tetrachlorophthalate and p‐BDC‐Cl₄ = tetrachloroterephthalate) were synthesized in different solvents using two isomeric tetrachlorinated benzenedicarboxylic acids. Complex 1 based on o‐BDC‐Cl₄ features an extremely rare 2D trinodal (3,4,6)‐connected network constructed by the combination of 1D [Cd‐H₂O]_n chains and 1D [Cd₂(o‐BDC‐Cl₄)₂]_n loop‐like motifs. Complex 2 based on p‐BDC‐Cl₄ has a 3D framework and shows a uninodal 4‐connected sra topology. Complexes 1 and 2 were characterized by elemental analyses, IR spectroscopy, single‐crystal X‐ray diffraction and thermogravimetric (TG) analyses. The photoluminescence of 1 and 2 were investigated in the solid state at room temperature.