Synthesis and crystal structures of copper(II) and silver(I) complexes of a biphenyl-bridged bipyrazolyl ligand

Duan, Peng‐Cheng; Huang, Zhandong; Zhang, Fang-Fang; Yang, Guang

doi:10.1007/s11243-012-9627-y

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The single-crystal structure analysis showed that 3 is a fascinating cyclic tetramer of formula [Ag 4 (pyim) 4 ]·(CF 3 SO 3 ) 4 that is built up from the alternating connection of four Ag(I) ions to four ligands. Although examples of cyclic dimers consisting of two ligands and two Ag(I) ions, as in the case of complex 1 , are common in the literature, − cyclic tetramers composed of four ligands and four silver(I) ions are unusual. ,− The cyclic tetramer is located around a crystallographic inversion center. Therefore, the asymmetric unit is composed of two Ag(I) ions (Ag1 and Ag2), two pyim ligands, and two trifluorosulfonate anions.…”

Section: Resultsmentioning

confidence: 99%

Role and Effect of Anions in the Construction of Silver Complexes Based on a Pyridylimidazole Ligand with L-Type Coordination Vectors and Their Photoluminescence Properties

Lee

Kang

Cho

et al. 2016

Crystal Growth & Design

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Three anion-dependent Ag(I) coordination complexesspecifically, [Ag 2 (pyim) 2 (NO 3 ) 2 ] (1), {[Ag(pyim) 2 ]• ClO 4 •CH 3 OH•(H 2 O) 1.25 } n (2), and [Ag 4 (pyim) 4 ]•(CF 3 SO 3 ) 4 ( 3)were prepared by the reaction of the corresponding silver salts with a rigid ditopic N-terphenyl-substituted 2-(4-pyridyl)imidazole (pyim) ligand possessing an "L"-type coordination vector. Complex 1, in which the nitrate anion acts as a monodentate terminal ligand, exhibits a discrete cyclic dimer structure, whereas complex 2, incorporating a perchlorate anion with weak coordination ability, displays an anion-free one-dimensional (1D) looped chain structure resulting from the Ag sharing of consecutive cyclic dimers. When using a trifluoromethanesulfonate (triflate) as a counteranion with moderate affinity toward the metal center, the resulting complex 3 exhibits an unusual cyclic tetramer structure. In 3, the triflate anions act as bridges between adjacent cyclic tetramers via the weak interaction with the Ag(I) ions, yielding a parquet-like two-dimensional (2D) framework. All three complexes display violet-blue emission, with maxima ranging from 388 to 396 nm. Furthermore, in solution, complex 2 exhibits a substantial emission enhancement, resulting in an emission intensity nearly 2 orders of magnitude greater than those of both the free ligand and the two other Ag(I) complexes, 1 and 3. Counteranions possessing different abilities to coordinate to Ag(I) play important roles in the structural diversity and photoluminescence properties of 1−3.

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Section: Resultsmentioning

confidence: 99%

Role and Effect of Anions in the Construction of Silver Complexes Based on a Pyridylimidazole Ligand with L-Type Coordination Vectors and Their Photoluminescence Properties

Lee

Kang

Cho

et al. 2016

Crystal Growth & Design

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“…28 Moreover, a new absorption band at 687 cm À1 caused by the interaction between copper cations and pyrazole was detected. 29,30 The intensity of the emission spectrum of P3-Cu decreases sharply compared with that of P3 (Fig. S2 †).…”

Section: Resultsmentioning

confidence: 97%

One-step synthesis of polypyrazoles and self-assembled polypyrazole–copper catalysts for click chemistry

et al. 2014

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“…The present paper is, therefore, aimed at synthesizing, through a simple chemical precipitation and high-yielding method, a family of six new silver(I)-based CPs incorporating the flexible ligand H 2 DMPMB with the general stoechiometric formula [Ag(H 2 DMPMB)(X)] (X = NO 3 , 1 ; CF 3 CO 2 , 2 ; CF 3 SO 3 , 3 ; BF 4 , 4 ; ClO 4 , 5 ; and PF 6 , 6 ). Only two examples of silver nitrate and perchlorate complexes with the ethyl homologues of the flexible H 2 DMPMB ligand were reported a few years ago [62]. Recently, two photoluminescent silver nitrate 1D coordination polymers with the bitopic ligand 1,1,2,2-tetra(pyrazol-1-yl)ethane were structurally characterized [63].…”

Section: Introductionmentioning

confidence: 99%

New Antibacterial Silver(I) Coordination Polymers Based on a Flexible Ditopic Pyrazolyl-Type Ligand

et al. 2019

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In the last two decades, a tremendous amount of attention has been directed towards the design of antibacterial silver(I)-based materials, including coordination polymers (CPs) built up with a great variety of oxygen and nitrogen-containing ligands. Herein, a family of six new silver(I)-based CPs, having the general stoechiometric formula [Ag(H2DMPMB)(X)] (X = NO3, 1; CF3CO2, 2; CF3SO3, 3; BF4, 4; ClO4, 5; and PF6, 6) and incorporating the flexible ditopic pyrazolyl-type ligand 4,4′-bis((3,5-dimethyl-1H-pyrazol-4-yl)methyl)biphenyl (H2DMPMB), has been prepared by the chemical precipitation method involving the reaction of silver(I) salts with H2DMPMB in the 1:1 molar ratio, in alcohols, or acetonitrile at room temperature for two-hours. The new silver(I)-based polymeric materials were characterized by means of Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), and thermogravimetric analysis (TGA), allowing for the proposition that their structures comprise one-dimensional chains, with the silver(I) ions mostly assuming a T-shapped stereochemistry completed by the exo-bidentate ligands and counter-anions. The obtained silver(I) CPs showed a remarkable light insensitivity and stability in the air, are insoluble in water and in most common organic solvents, and possess appreciable thermal stabilities spanning the range 250–350 °C. The antibacterial activity of the obtained silver(I) CPs was tested against the Gram-negative bacteria Escherichia coli (E. coli) and Gram-positive bacteria Staphylococcus aureus (S. aureus) using the Tetrazolium/Formazan test (TTC), by measuring the bacterial viability at different time intervals. The complete reduction of both bacterial strains occurred after 24 h of exposure to all silver(I) CPs, the bacterial viability values for S. aureus reaching 8% for compounds 3, 5, and 6 after only two-hours.

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Synthesis and crystal structures of copper(II) and silver(I) complexes of a biphenyl-bridged bipyrazolyl ligand

Cited by 5 publications

References 11 publications

Role and Effect of Anions in the Construction of Silver Complexes Based on a Pyridylimidazole Ligand with L-Type Coordination Vectors and Their Photoluminescence Properties

Role and Effect of Anions in the Construction of Silver Complexes Based on a Pyridylimidazole Ligand with L-Type Coordination Vectors and Their Photoluminescence Properties

One-step synthesis of polypyrazoles and self-assembled polypyrazole–copper catalysts for click chemistry

New Antibacterial Silver(I) Coordination Polymers Based on a Flexible Ditopic Pyrazolyl-Type Ligand

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