Synthesis, Crystal Structure and Property of a Series of Supramolecular Polymers Based on Novel 3,5-Dimethyl- 2,6-bis(3-(pyrid-2-yl)-1,2,4-triazolyl)pyridine Ligand

Solvothermal reactions of 3,5-dimethyl-2,6-bis（3-（pyrid-2-yl）-1,2,4-triazolyl） pyridine （L）, 1,4-benzendicarboxylic acid （H2bdc）, and transitional metal cations of M11 （M = Mn, Co, Cd） in the presence of oxalic acid （H2ox） afford three novel supramolecular polymers （CPs）, namely, {[M2（ox）（L）2][bdc][M2（Hox）2（OH）（H2O）4]·3H2O}n （M = Mn for 1, Co for 2, Cd for 3）. Single-crystal X-ray diffraction analysis reveals that complexes 1-3 are isostructural and the 3D supramolecular structure was connected through non-covalent interactions. With the help of H2ox, the L ligands cheated with center atoms forming a butterfly [M2（ox）（L）2]2＋ building block. The bdc2- ligand linked with the unprecedented [M2（Hox）2（OH）2（H2O）4] units through strong O-H...O hydrogen bonds forming a zigzag chain, which are further connected through π-π interactions between L and bdc2- ligands to form a 3D supramolecular structure. Moreover, elemental analyses, IR, thermogravimetric, PXRD and luminescence have been investigated.

A New Zn(Ⅱ) Coordination Polymer Constructed from 4-(1H-pyrazol-3-yl)pyridine as Fluorescent Sensor for Fe^(3+)

A new Zn(Ⅱ) coordination polymer, [Zn(4-PP)(1,4-BDC)?(H_2O)]_n(1, 4-PP = 4-(1 H-pyrazol-3-yl)pyridine, 1,4-H_2BDC = 1,4-benzenedicarboxylic acid), has been synthesized and structurally characterized by single-crystal X-ray diffraction as well as elemental analysis, IR spectra, XRPD and TG. Structural analysis reveals that Zn(Ⅱ) ions are bridged by COO-from 1,4-BDC^(2-)to form a binuclear structure as the second building units(SBUs). Zn_2 clusters can be clarified as 4-connected nodes, so the framework of 1 can be considered as a 2 D(44?62)-sql sheet. Fluorescence measurements show that 1 has highly selective and sensitive detection of Fe^(3+) in water medium.

One Novel Tetranuclear Copper Cluster by 2-(1H-Pyrazol-3-yl)pyridine:Synthesis, Structure and Properties

A novel tetranuclear copper cluster[Cu4(μ-L)6Cl2]was constructed by 2-(1H-pyrazol-3-yl)pyridine(HL)under hydrothermal conditions,and structurally concluded by single-crystal X-ray diffractions,elemental analyses and IR spectra.The title complex 1 was of triclinic system,space group■,C24H18ClCu2 N9,Mr=595.01,a=9.6497(13),b=11.4133(7),c=13.0919(15)?,α=99.166(7),β=108.707(11),γ=111.974(9)°,V=1200.7(2)?3,Z=2,Dc=1.997 g/cm^3,F(000)=706,μ(MoKα)=3.203 nm-1,Rint=0.0404,R=0.0536 and wR=0.1490 for4890 observed reflections with I>2σ(I).In this structure,complex 1 was the unimolecule with unprecedented tetranuclear cluster,which was expanded into a 2D network by wide-ranging C-H…Cl intermolecular hydrogen bonds and further exhibited a 3D supramolecular architecture based onπ-πstacking interactions.In addition,the complex was thermally stable up to 300℃and the solid state fluorescent property of 1 was examined and compared with the ligand.

Synthesis of Heterocycle Compounds Containing Two Pyridazinone Units

Four novel compounds containing two pyridazinone units attached to one benzene or pyridine ring, protected and deprotected 1,5-di[3（2H）-pyridazinon-6-yl]benzene and 2,6-di[3（2H）-pyridazinon-6-yl]pyridine were synthesized in eight steps, which provided a useful method for the preparation of pyridazinone derivatives via the Stetter and cyclization reactions. Their structures were characterized by ^1H NMR, ^13C NMR, and HRMS.