Flexible Bis Triazole Ligands Research Articles

One Cd(II) coordination polymer based on flexible 4,4′-di(4H-1,2,4-triazole-4-yl)methyldiphenyl: Synthesis, structure and luminescent property

Under hydrothermal conditions, one Cd(II) coordination polymer (Cd-CP) has been successfully created using the flexible bis-triazole ligand and dicarboxylate ligand. In Cd-CP, one-dimensional chain structure is created by the interconnection of the adjacent cadmium ions via water bridges. To create a two-dimensional layer structure, the mutually parallel one-dimensional cadmium chains are connected further by dicarboxylate ligands. The final three-dimensional stacking structure is formed by bis-triazole ligands connecting adjacent two-dimensional layers. The theoretical computations and the experimental fluorescence characteristics are in agreement, which shed deep light on the fluorescence properties of Cd-CP. The associated findings demonstrate that the carboxylate and bis-triazole coligands can successfully modify the architectures of coordination polymers, which illustrates the feasibility of constructing functional coordination materials from bis-triazole ligands.

Octamolybdate-based hybrid constructed by flexible bis-triazole ligands: synthesis, photocatalytic and electrochemical properties

A novel polyoxometalate-based organic–inorganic hybrid compound was synthesized via a facile in situ hydrothermal reaction. 1 exhibits selective photocatalytic degradation of dyes and the great property to electrocatalytically reduce H2O2 and NaNO2.

Effect of Dicarboxylate Ligands on the Construction of Cd(II) Complexes Based on a Flexible Bis-Triazole Ligand

In this work, two dicarboxylate ligands, 4,4′-oxybis(benzoic acid) (H2oba) and 4,4′-biphenyldicarboxylic acid (H2bpdc) were employed as coligands to perform a comparison on the structures of Cd(II)-btmx complexes (btmx = 1,4-bis(1,2,4-triazol-1-ylmethyl)-2,3,5,6-tetramethylbenzene) motifs. Two new complexes, {[Cd(btmx)(oba)]·H2O}n (1) and [Cd(btmx)(bpdc)]n (2), have been synthesized and characterized. Structural analyses show that 1 shows a 1D double-chain, while 2 displays an undulating 2D 44-sql network with 2-fold interpenetration. The structural differences of the two complexes suggest that the dicarboxylate ligands have great impact on the formation of such coordination architectures. Furthermore, the photoluminescence properties of 1 and 2 have also been investigated.

Three double- or triple-stranded chains constructed from different cobalt(II) salts and a flexible bis-triazole ligand

Three coordination compounds, {[Co(btrp)2(H2O)2] · NO3 · H2O} n (1), {[Co(btrp)2(H2O)2] · H2O · 2H2btc} n (2), and {[Co(btrp)3] · 2ClO4} n (3) (btrp = 1,3-bis(1,2,4-triazol-1-yl)propane; H3btc = benzene-1,3,5-tricarboxylic acid), have been prepared via solvothermal method and characterized by single-crystal X-ray diffraction and elemental analyses. Compound 1 possesses a 1-D double-stranded chain composed of ribbons of 20-membered cycles. Binuclear water clusters link adjacent nitrate anions to form a 1-D supramolecular helix in the structure. Compound 2 has a 1-D double-stranded chain wherein free H2btc ligands constitute 1-D negative chains through classical hydrogen-bonding interactions (O–H ··· O). Compound 3 exhibits a triple-stranded 1-D chain. For 1–3, 3-D supramolecular structures are consolidated by interchain weak hydrogen-bonding interactions as well as electrostatic interactions.

Synthesis, structure, fluorescent and magnetic properties of a series of coordination polymers based on a long and flexible bis-triazole ligand

Using the long and flexible bis(4-(4H-1,2,4-triazol-4-yl)phenyl)methane (BTPM) as a ligand, six novel coordination polymers have been synthesized under hydrothermal conditions. {[Zn(BTPM)(HCOO)](NO3)·2.25H2O}n (1) and {[Cd(BTPM)(HCOO)](NO3)·H2O}n (2) exhibit 2D bi-wave layers with one dimensional microchannels of 9 × 9 A2, which can form 3D supramolecular structures by intermolecular hydrogen bonds. Both {[Zn2(BTPM)3(H2O)4](NO3)4·H2O}n (3) and {[Cd2(BTPM)3(H2O)4](NO3)4·3.5H2O}n (4) are composed of multiple pairs of interpenetrating (4,4) sheets. {[Cu8(μ4–O)(μ2–H2O)2(BTPM)12](ClO4)14·4H2O}n (5) and {[Co3(BTPM)3(H2O)6](NO3)6·7H2O}n (6) are 3D interpenetrating frameworks. In complex 5, a rare square planar tetra-coordinate oxygen (ptO) and two different tetranuclear copper(II) clusters, [Cu4(μ2–H2O)2N20] and [Cu4(μ4–O)N20], have been observed. Complex 6 shows a 6-connected topology based on linear trinuclear clusters. The fluorescent properties of 1–4, as well as the magnetic properties of 5 and 6 are studied.

A new complex of Mn(II) with highly flexible bistriazole ligand 1,2-bis(1,2,4-triazole-l-yl)ethane: Synthesis and crystal structure

Using a highly flexible ligand 1,2-bis(1,2,4-triazole-1-yl)ethane (L), the one-dimensional (1D) chain polymer [[Mn(L)(Cl)2(H2O)2] n (I) has been synthesized and structurally characterized. The crystal crystallizes in the monoclinic system, space group C2/c, a = 12.507(4), b = 8.812(3), c = 12.662(4) A, β = 115.474(6)°, Z = 4. The X-ray analysis shows that I has the three-dimensional (3D) supramolecular network featuring 1D channel along the crystallographic y axis via intermolecular O-H...N interactions.

Synthesis, crystal structure and characterization of two Cu(II) complexes assembled with flexible bistriazole butane

Abstract Using a flexible bis-triazole ligand 1,4-bis(1,2,4-triazol-1-y1)butane (btrb), two new copper(II) compounds [Cu0.5(btrb)0.5Cl]n (1) and [Cu0.5(btrb)Cl]n (2), have been isolated. Conformations of btrb can be tuned as a result of changing the metal/ligand ratio in the reaction system, which ultimately forms two novel framework structures. 1 is a three dimensional network with CdSO4 topology, and uncommonly six-fold Cl…H–C hydrogen bonds reside in the 3D framework. 2 possesses 2D (4.4) net framewok. Triple Cl…H–C hydrogen bonds reside among the 2D layers, which link the 2D layers to lead to a 3D supramolecular architecture. For 1 and 2, elemental analysis, thermal stability and EPR spectra have been carried out, and the conformational variation of btrb also has been discussed.

Crystal structures and luminescent properties of zinc(II) and cadmium(II) compounds constructed from 5-sulfoisophthalic acid and flexible bis-triazole ligands

Four new cadmium(II) and zinc(II) coordination polymers {[Zn(btrp)(SIP)][Zn 0.5(H 2O) 3]} n ( 1), {[Cd 1.5(btrp)(SIP)(H 2O) 2]·2H 2O} n ( 2), {[Cd 1.5(btrb)(SIP)(H 2O) 3]·2H 2O} n ( 3), {[Zn 1.5(btrb) 1.5(SIP)(H 2O) 2]·2H 2O} n ( 4) (btrp = 1,3-bis(1,2,4-triazol-1-yl)propane, btrb = 1,3-bis(1,2,4-triazol-1-yl)butane, NaH 2SIP = 5-sulfoisophthalic acid monosodium salt) have been synthesized under hydrothermal conditions and structurally characterized. Compound 1 possesses an infinite 1D ladder-like chain structure with [Zn(H 2O) 6] 2+ trapped in the pores, which is further interconnected by π⋯π interactions to lead to a 2D supramolecular architecture. Compounds 2 and 3 features two similar 2D layer structures, and the resulting 2D structures are interconnected by hydrogen-bond interactions to lead to 3D supramolecular architectures. Compound 4 is a 2D parallel ladder structure, and through the interpenetrating btrb ligand, it constructs into 3D architectures. Luminescence analyses were performed on all the four compounds, which show strong fluorescent emissions in the solid state at room temperature.

Syntheses, structures and luminescence of a series of Cd(II)-containing coordination polymers constructed from a long flexible bis-triazole ligand

Six novel Cd(II) coordination polymers based on 4,4′-bis(1,2,4-triazol-1-ylmethyl)biphenyl (btmb), namely, [Cd(btmb) 2I 2] n ( 1), [Cd(btmb)I 2] n ( 2), {[Cd(btmb) 2(NO 3) 2]·H 2O} n ( 3), {[Cd(btmb) 2(SCN) 2]·3H 2O} n ( 4), {[Cd(btmb)(CH 3COO) 2(H 2O)]·CH 3CN} n ( 5) and [Cd(btmb)Cl 2(H 2O)] n ( 6) have been synthesized by the reactions of btmb with Cd(II) salts in the presence of different anions (I −, NO 3 - , NCS −, CH 3COO − or Cl −) under appropriate reaction conditions. The assemblies of btmb with CdI 2 afford two different structures: two-dimensional (2D) rhombohedral grid layer network structure 1 and 2D layer structure 2 involved with one-dimensional (1D) linear cadmium chains. Treatment of btmb with Cd(NO 3) 2·4H 2O gives rise to a 2D grid network structure 3 which is similar to 1. When the I − or NO 3 − anions were replaced by NCS −, CH 3COO − or Cl −, different 1D coordination polymers 4– 6 were obtained, respectively. Polymer 4 displays a 1D double-chain structure, while both polymers 5 and 6 show 1D zigzag chain structures. In addition, the luminescence measurements reveal that polymers 1– 6 exhibit different fluorescent emissions in the solid-state at room temperature, which can be attributed to the various coordination environments of Cd(II), solvent molecules and different packing interactions in these polymers.

Structural Variations Influenced by Ligand Conformation and Counteranions in Copper(II) Complexes with Flexible Bis-Triazole Ligand

Using a flexible bis-triazole ligand 1,4-bis(triazol-1-ylmethyl)benzene (L), four new copper(II) compounds {[Cu(trans-L)(cis-L)2(H2O)2](CF3SO3)2·4H2O}n (1), {[Cu(cis-L)2(H2O)2](CF3SO3)2·2H2O}n (2), {[Cu(trans-L)2]Cl2}n (3), and {[Cu(trans-L)(cis-L)](BF4)2}n (4) have been isolated. Conformations of L in 1−4 can be tuned as a result of changing the anion or metal/ligand ratio in the reaction system, which ultimately form a series of novel framework structures varying from 1D to 3D with different supramolecular architectures. 1 is a 1D single-chain structure, in which trinuclear water clusters link adjacent triflate anions to form 1D supramolecular helix. 2 is composed of right-helical Cu(II) bis-triazole chains, which are interlinked via copper(II) ions as hingers forming a novel 2D layered structure. Eight-member supramolecular cycles constructed by coordinated water molecules and free triflate anions are found to be embedded into the 2D planes of 2. 3 contains 2D planar nanogrid networks stacked in an AB ...