A New One-dimensional Chain-like Ag(I) Complex with Schiff Base Ligand Containing 4-Amino-1,2,4-triazole

The title compound,poly[N-[1-（3-pydidyl）ethylidene]-4H-1,2,4-triazol-4-amine sil-ver（I） tetrafluoroborate],[Ag（C9H9N5）（BF4）]n,is the result of complexing Ag cation with N-[1-（3-pydidyl）ethylidene]-4H-1,2,4-triazol-4-amine （L）,and its crystal structure was determined by single-crystal X-ray diffraction.The crystal belongs to the monoclinic system,space group C2/c with a= 18.899（6）,b=9.882（2）,c=15.472（4）,β=120.158（3）°,V=2498.5（11）3,C9H9AgBF4N5,Mr= 381.89,Dc=2.031 g/cm3,μ（MoKα）=1.659 mm-1,F（000）=1488,Z=8,the final R=0.0441 and wR=0.0619 for 1094 observed reflections （I 〉 2σ（I））.In the structure,ligand L bridges the two metal Ag（I） centers in a bidentate fashion and each metal ion coordinates with two nitrogen atoms,forming a one-dimensional rectangular chain.The neighboring chains are connected by two additional Ag-N weak interactions into a 3D framework structure.The title compound shows blue fluorescence property at room temperature.

Two Metal-organic Coordination Polymers with Rigid Bis(triazole) Ligand： Assembly, Structures, and Fluorescence Properties

Two new coordination polymers containing rigid bis（triazole）, namely, [Ni（btb）_（0.5）（nph）（H_2O）]_n（1） and [Zn（btb）（SO_4）]_n（2）（btb = 4,4a-bis（1,2,4-triazolyl-1-yl）-biphenyl, H_2nph = 3-nitrophthalic acid） have been synthesized and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. Complex 1 shows a 3D trinodal（3,4,4）-connected sqc69 topology. Complex 2 presents a 2D uninodal 4-connected sql network, which is further packed into a 3D supramolecular framework by C-H···O hydrogen bonds. Thermal stabilities and fluorescence properties of two complexes have been discussed in detail.

Triazole backbone ligand in an unprecedented efficient manganese catalyst for use in transfer hydrogenation

Noble metal catalysts are generally expensive,and thus,abundant 3d metals recently received significant attention as catalysts in catalytic hydrogenation.Mn catalysts are widely applied in transfer hydrogenations,but the reported catalyst loadings remain up to three orders of magnitude higher than noble metals.Thus,catalyst consumption should be overcome before 3d metal catalytic systems may be utilized practically in industry.Here,a catalytic system based on novel,scalable triazole N5-ligands coordinated to Mn is presented for use in transfer hydrogenations.Based on pre-activation via dehydrohalogenation,an unprecedented,efficient catalytic system operating via synergistic H-bond auxiliary activation was established.The Mn catalysts are practical at metal concentrations 0.0001 mol%,generating alcohol with turnover number(TON)up to 857,200,thus approaching loadings more conventionally observed in precious-metal-based systems.Notably,using this protocol,several pharmaceuticals may be easily synthesized in one pot.

Synthesis and Crystal Structure of 1,4-Bis(1H-1,2,4-triazol-1-methyl)benzene

The title compound 1,4-bis(1H-1,2,4-triazol-1-methyl)benzene has been synthesized and its structure was determined by single-crystal X-ray diffraction. Crystal data: C12H12N6, mono- clinic, space group P21/n, a = 4.567(2), b = 13.695(5), c = 9.376(9) ? b = 94.221(7)o, V = 584.8(4) 3, Mr = 240.28, Z = 2, Dc = 1.364 g/cm3, F(000) = 252, m(MoKa) = 0.090 mm-1, the final R = 0.0493 and wR = 0.1051 for 1254 observed reflections (I > 2s(I)). The molecule has a symmetry center which locates at the center of the phenyl ring. The dihedral angle between the planes of triazole and phenyl rings is 77.81(9)o.

Synthesis and Crystal Structure of the Copper Complex {[Cu(CH_3COO)_2(bbtz)](H_2O)_2}_n

The new copper complex { [Cu（CH3COO）2（bbtz）]（H2O）2 }, 1 （bbtz = 1,4-bis（ 1,2,4- triazol-1-ylmethyl）benzene） was synthesized and the structure was determined by single-crystal X-ray diffraction. Crystal data： C16H22CuN6O6, monoclinic, space group P21/n, a = 12.589（5）, b = 6.455（2）, c = 12.677（5） A, β= 98.748（9）°, V= 1018.2（7） A^3, Mr = 457.95, Z = 2, Dc= 1.494 g/cm^3, F（000） = 474, μ = 1.118 mm^-1, R = 0.0463 and wR = 0.0939 for 1971 observed reflections with I 〉 2σ（I）. The crystal structure of 1 is a one-dimensional chain via the bridging flexible ligand bbtz.

Synthesis and Crystal Structure of [Cu(bbtz)(HCOO)_2(H_2O)_2]_n

The title compound [Cu（bbtz）（HCOO）2（H2O）2], （bbtz = 1,4-bis（1,2,4-triazol-1- ylmethyl）-benzene） was synthesized by the reaction of Cu（HCOO）2 and bbtz in methanol/H2O solution and its structure was determined by single-crystal X-ray diffraction. Crystal data： C14H18CuN6O6, monoclinic, space group P2 1/c, a = 9.651（2）, b = 10.380（2）, c = 9.368（2） A, β = 112.905（5）°, V = 864.5（3） A^3, Mr = 429.88, Z = 2, Dc = 1.651 g/cm^3, F（000） = 442, μ = 1.311 mm^-1, the final R = 0.0305 and wR = 0.0856 for 1891 observed reflections with I 〉 2σ（I）. X-ray crystal-structure analysis suggests the central copper atom of the title compound is six-coordinated in a distorted octahedral geometry by two nitrogen atoms from two bbtz ligands as well as four oxygen atoms from two H2O and two HCOO^-. The copper atoms are linked by bridging ligand bbtz to form a one-dimensional chain. There are intra- and interchain hydrogen bonding interactions between hydrogen atoms of coordinated water and uncoordinated oxygen atom of HCOO^-.

A High Dimensional Coordination Polymer Based on [β-Mo_8_(O)_(26)]^(4-) Inorganic Building Block: Synthesis, Structure and Topology

A high dimensional copper coordination polymer {[Cu2（btb）2（H2O）4（ -Mo8O26）] H2O}n（1, btb = 1,4-bis（1,2,4-triazol-1-yl）butane） based on [ -Mo8O26]4 anions and flexible bis（triazole） ligands has been synthesized and characterized by elemental analysis, IR spectra, single-crystal X-ray diffraction and thermal analysis. The crystallographic data show that complex 1 crystallizes in triclinic space group P with a = 9.7550（10）, b = 10.3996（11）, c = 10.9516（11）, = 77.622（2）, = 89.602（2）, = 87.610（2）, V = 1084.25（19）3, C16H34Cu2Mo8 N12O31, Mr = 1785.15, Dc = 2.734 g cm 3, μ（MoKα） = 3.303 mm 1, F（000） = 856, GOF = 1.060, Z = 1, the final R = 0.0376 and wR = 0.0982 for I 〉 2 （I）. In 1, the inorganic building block [ -Mo8O26]4 anions are connected with each other to generate one-dimensional chains. Then the chains are further connected by Cu2＋ ions to form a three-dimensional （3D） inorganic framework [Cu2（ -Mo8O26）]n containing quadrangular channels, with the pcu alpha-Po primitive cubic topology. The btb ligands are encapsulated into the void of the 3D inorganic framework forming a new three-dimensional architecture. The thermal analysis illustrates that complex 1 retains a comparatively good thermal stability.

Design,Synthesis and Characterization of Coordination Polymer from[Cu(DMF)_(4)(SCN)_(2)]as a Precursor

This paper is focused on investigation of coordination polymers constructed by Cu(II)and rigid pyridyl ligands,such as 4,4'-bipyridyl-1,2,4-triazole(Hpytz)and 1,10-phenanthroline(phen)from a mononuclear precursor[Cu(DMF)_(4)(NCS)_(2)](1).As expected,the complex was self-assembled with phen to form a 1D double-stranded chain of[Cu(phen)(μ-SCN)_(2)]∞(2),with Hpytz to form 1D zigzag chain of[Cu_(2)(μ-Hpytz)_(2)(NCS)_(2)(DMF)_(2)(μ-SCN)_(2)]∞(3)in which thiocyanate anion linked the Cu-μ-Hpytz-Cu chain into an infinite 2D network via weak Cu…S interaction.To treat 3 with the bridged anion dca,a novel 3D framework[Cu(μ-Hpytz)(μ-dca)(μ-SCN)]∞(4)was obtained in which Cu-μ-Hpytz-Cu chain is preserved and both thiocyanate anion and dicyanamide(dca)act as bridging ligands.In addition,complex 3 was applied as a metal catalyst in polymerization of MMA in aqueous solution at room temperature.

Facile Synthesis of 1,5-Diaryl-4-pyridyl-1,2,3-triaozle Derivatives

A feasible approach to synthesize 1,5-diaryl-4-pyridyl-1,2,3-triaozle via a sequential route from 2-alkynyl pyridine was developed. In this work, KOH was identified as a crucial base to promote the Pd-catalyzed arylation step. Compared to the reported methods, this protocol largely improved the reaction efficiency with overall excellent yield and good functional group tolerance.