Synthesis and crystal structures of two polymeric silver(I) complexes with polyamines and terephthalic acid

Two polymeric silver(I) complexes, [Ag₄(TAA)₂(TA)₂] · 2[Ag(TA)₂] (I) and [Ag₂(TA)(BA)] _n (II), where TAA is tris(2-aminoethyl)amine, TA is terephthalic acid, BA is butane-1,4-diamine, were synthesized and structurally characterized by elemental analyses and X-ray diffraction. Complex I consists of mononuclear [Ag(TA)₂] units and TA-bridged tetranuclear [Ag₄(TAA)₂(TA)₂] units, which are further linked via Ag…Ag interactions to form chains. In complex II, the silver atoms are linked by the TA and BA groups to form chains, which are further linked via Ag…Ag interactions to form layers. In both complexes, molecules are finally linked through intermolecular hydrogen bonds to form three-dimensional networks.     

Synthesis and crystal structures of four mixed-ligand silver(I) complexes with sandwich-like structure

The reaction of AgNO₃, with combinations of 4,4′-bipyridine (bpy), 1,2-di(4-pyridyl)ethylene (dpe), hexanedioic acid (HA), pyridine-3,5-dicarboxylic acid (pdc) and 3,3′4,4′-biphenyltetracarboxylic acid (bptc) in aqueous alcohol at room temperature produces block-like crystals of [Ag₂(bpy)₂](HA)₂·6H₂O, [Ag₂(bpy)₂(H₂O)](pdc)·3H₂O, [Ag₄(bpy)₄](bptc)·14H₂O and [Ag₂(dpe)₂(H₂O)₂](HA)·6H₂O. All four compounds consist of parallel 1D infinite bpy/dpe-silver cationic chains, interspersed with organic anions that play the role of charge compensation in the crystal structure. The lattice water molecules are situated among the framework of the crystal structure and stabilized by rich hydrogen-bonding interactions, which may play a role in the orientation of the organic anions in the crystal packing.     

Synthesis,crystal structure,and antimicrobial activity of silver(I) complexes derived from 3-nitrobenzoic acid and diamines

Russian Journal of Coordination Chemistry - Two new silver(I) complexes, [Ag2(NBA)2(DAC)] (I) and [Ag2(NBA)2(DAB)] (II), where NBA, DAC, and DAB are 3-nitrobenzoate, 1,2-diaminocyclohexane, and...     

Synthesis,crystal structures,and DNA-binding studies of two silver(I) complexes with 1,3-bis(1-ethylbenzimidazol-2-yl)-2-thiapropane

Two new silver(I) complexes, [Ag(bebt)(methacrylate)] (1) and [Ag₂(bebt)₂](pic)₂ (2) (bebt = 1,3-bis(1-ethylbenzimidazol-2-yl)-2-thiapropane, pic = picrate), have been synthesized and characterized by physico-chemical and spectroscopic methods. Single-crystal X-ray diffraction revealed that the structure of 1 was four-coordinate in a distorted tetrahedral geometry, while in 2, it may be described as a 2 + 1 coordinated silver(I) compound with a nearly linear N–Ag–N backbone and a weak Ag–S interaction. Two ligands are arranged in a face-to-face syn conformation to coordinate to two Ag(I) ions from opposite directions in 2, generating a U-type double layer structure around the metal ions. Experimental studies of the DNA-binding properties indicated that free bebt and both complexes bind to DNA via intercalation, and the order of the binding affinity is 2 > 1 > bebt.     

Synthesis and crystal structures of two zinc(II) complexes derived from 4-bromo-2-(cyclopentyliminomethyl)phenol with different solvents

Two new mononuclear zinc(II) complexes, [ZnL₂] (I) and [ZnL₂] · 2MeOH (II) (HL = 4-bromo-2-(cyclopentyliminomethyl)phenol), were synthesized by the reaction of the Schiff base HL with zinc acetate in ethanol and methanol solutions, respectively. Both complexes were characterized by elemental analyses and single-crystal X-ray diffraction. The crystal of I is orthorhombic: space group Pbca, a = 14.711(3), b = 13.223(3), c = 24.870(5) Å, V = 4837.8(18) ų, Z = 8. The crystal of II is monoclinic: space group C2/c, a = 20.581(5), b = 10.660(3), c = 15.428(4) Å, β = 119.919(3)°, V = 2933.7(13) ų, Z = 4. The Zn atom in each complex is four-coordinated by two imine N and two phenolic O atoms, forming a tetrahedral geometry. Complex II possesses crystallographic two-fold rotation axis symmetry.     

Synthesis,crystal structures,and antibacterial studies of silver(I) complexes with reduced Schiff base amino acid ligands

Three Ag(I) complexes of reduced Schiff base amino acid ligands, [Ag₂(Hshis)₂]·3H₂O (1), Ag(Hcgly) (2), and Ag(cala) (3) (H₂shis = N-(2-hydroxybenzyl)-l-histidine, H₂cgly = N-(2-hydroxy-5-chlorobenzyl)-glycine, Hcala = N-(4-chlorobenzyl)-d,l-alanine), have been synthesized and characterized by X-ray crystallography. Complex 1 shows a dimeric structure, while complex 2 shows one-dimensional zigzag chains, which are extended into a two-dimensional supramolecular sheet by hydrogen bonds. Complex 3 exhibits a 2D sheet structure with dangling arms. The antimicrobial activities of the complexes have been investigated.     

Hydrothermal syntheses, crystal structures and luminescent properties of two novel silver (I) complexes with 5-methyl-2-pyrazinecarboxylate

The self-assembly of 5-methylpyrazine-2-carboxylate (Hmpca) with silver nitrate generated two coordination polymers [Ag₂(Hmpca)(mpca)(NO₃)] _n (1) and [Ag(mpca)] _n (2) in the presence of Er³⁺ or Mn²⁺ via hydrothermal synthesis. The complexes have been characterized by IR, elemental analyses and single-crystal X-ray diffraction. Complex 1 possesses a novel 1D looped-chain topology structure. Complex 2 shows an extended honeycomb-like 3D framework. The luminescent properties of complexes 1 and 2 were investigated.     

Synthesis, crystal structures, and photoluminescence of two silver(I) coordination polymers based on 2-sulfoterephthalic acid and N-donor ligands

The reactions of 2-sulfoterephthalic acid (H₃stp) with silver nitrate in the presence of 2-aminopyrimidine (apym) or 2-amino-4,6-dimethylpyrimidine (dapym) generated two 2-D coordination polymers {[Ag₃(stp)(apym)₃]·2H₂O} _n (1) and {[Ag₂(Hstp)(dapym)₂ (H₂O)]·H₂O} _n (2). The complexes have been characterized by single-crystal X-ray diffraction, physico-chemical, and spectroscopic methods. Both complexes have a 2-D layer structure with infinite 1-D chains linked by stp^3? ligands and hydrogen bonds. The luminescent properties of the complexes were investigated.     

Synthesis,crystal structures,and photocatalytic properties of two 2D supramolecular silver(I) coordination polymers derived from bis(1,2,4-triazole) and aromatic dicarboxylate ligands

Two silver(I)-mixed ligand coordination polymers (CPs), {[Ag(L)(Hmip)]·H₂O} _n (1) and {[Ag(L)]·0.5(DCTP)·H₂O]} _n (2) (H₂mip = 5-methylisophthalic acid, H₂DCTP = 2,5-dichloroterephthalic acid, and L = 4,4′-bis(1,2,4-triazol-1-ylmethyl)biphenyl) have been hydrothermally synthesized and structurally characterized. Two CPs display 1D zigzag chain and linear chain structures, respectively. Furthermore, these 1D chains are extended into 2D supramolecular networks through hydrogen bonding interactions. The luminescence properties and photocatalytic behaviors of both CPs are reported.     

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

A semirigid bipyrazolyl ligand, 4,4??-bis[(3??,5??-diethyl-1H-pyrazol-4??-yl)methylene)]-1,1??-biphenyl (H₂L), and four of its Ag(I) and Cu(II) complexes have been prepared and structurally characterized. X-ray analysis demonstrates that the Ag(I) complexes are dinuclear molecular rectangle, while the Cu(II) complexes display a twisted rectangular structure. Two different conformations, namely cis and trans, have been observed for this bipyrazolyl ligand.     

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

A semi-rigid bipyrazolyl ligand, namely 5-tert-butyl-1,3-bis[(3′,5′-diethyl-1H-pyrazol-4′-yl) methylene]benzene, and its Ag(I) and Cu(II) complexes have been prepared and structurally characterized. X-ray analysis demonstrates that the Ag(I) complex is based on a dinuclear molecular rectangle, while the Cu(II) complex displays a mono-strand helical structure. Two different conformations, namely cis,cis and cis,trans have been observed for this bipyrazolyl ligand.     

Synthesis and crystal structures of two Zinc(II) complexes with 4-hydroxypyridine-2,6-dicarboxylic acid

Two new complexes [Zn(Hpda)(Bth-6)]_2n (I) and [Zn(Hpda)₂] · 2(H-Bpe) (II) (HpdaH₂ = 4-hydroxypyridine-2,6-dicarboxylic acid, Bth-6 = 1,6-bis(1,2,4-triazol-1-yl)hexane, Bpe = 1,2-bi(4-pyridyl)ethene) have been synthesized and characterized structurally. Their X-ray crystal structures show that the two complexes belong to a monoclinic system; space group P2₁/n with a = 11.9328(12), b = 20.975(2), c = 17.1544(17) Å; β = 91.406(2)°, Z = 4 for I; space group P2₁/c with a = 12.7150(19), b = 14.000(2), c = 22.171(3) Å; β = 96.481(2)°, Z = 4 for II. Compound I possesses a one-dimensional (1D) zigzag chain structure, each zinc(II) ion is five-coordinated with a distorted triangle bipyramid geometry. Compound II is discrete mononuclear species, in which the zinc(II) ion is six-coordinated with a distorted octahedral geometry. The [Zn(Hpda)₂]^2? units are connected one-dimensional chain by the intermolecular hydrogen bonds.     

Synthesis and crystal structures of manganese(III) complexes derived from bis-Schiff bases with antibacterial activity

Transition Metal Chemistry - Two mononuclear Mn(III) complexes, [MnL1(N3)(OH2)] (1) and [MnL2L′] (2), where L1 and L2 are the dianionic forms of...     

Structures and luminescence properties of two copper(I) halide complexes featuring 2-(2-benzimidazolyl)-6-methylpyridine

Two new copper（I） halide complexes bearing 2-（2-benzimidazolyl）-6-methylpyridine（Hbmp） and PPh₃ ligands, Cu（Hbmp）（PPh₃）X（X = Br（1）;I（2））,have been synthesized and characterized.Single-crystal X-ray structure analysis reveals that the halide ligand has a significant impact on the Cu-N_pyridyl bond lengths.Complexes 1 and 2 show the solid-state emissions at ambient temperature,varying with the halide bound to the {Cu（Hbmp）（PPh₃）} motif,which are perhaps best attributed to the metal-to-ligand charge-transfer（Cu（I）→Hbmp） transition mixed with some ligand-to-ligand charge-transfer（X and PPh₃→Hbmp） character.     

Syntheses and crystal structures of three structurally similar dinuclear silver(I) complexes

Three terephthalato-bridged dinuclear silver(I) complexes with the formulae Ag₂(5map)₄(tphth), [Ag₂(6map)₄(tphth)] · 2H₂O, and [Ag₂(4map)₄(tphth)] · 2H₂O (5map = 5-methyl-2-aminopyridine, 6map = 6-methyl-2-aminopyridine, 4map = 4-methyl-2-aminopyridine, tphth = terephthalate), have been synthesized and characterized by elemental analysis and single crystal X-ray diffraction. The Ag atom in each of the complexes is three-coordinate in a trigonal geometry with one carboxylate O atom and two pyridine N atoms. The characteristic difference among the complexes is the positions for the methyl groups of the aminopyridine ligands. The crystals of the complexes are stabilized by intermolecular N–H···O and O–H···O hydrogen bonds. Electronic supplementary material  The online version of this article () contains supplementary material, which is available to authorized users.     

Synthesis,characterization, and antimicrobial activity of two Schiff base silver(I) complexes derived from 4-carboxybenzaldehyde

Two new Schiff base silver(I) complexes, {[Ag(L¹)][H₂O]}_∞ (1) and {[Ag(L²)][H₂O]}_∞ (2), where L¹ = 4-((2-diethylaminoethylimino)methyl)phenecarboxylate and L² = 4-([3-(morpholin-4-yl)propyl]iminomethyl)phenecarboxylate, have been synthesized and characterized. X-ray crystallographic analysis reveals that silver ions in 1 are bridged by L¹ to form a one-dimensional zigzag chain, while three silver ions in 2 are linked by L² to produce a two-dimensional coordination polymer. Guest water molecules in 1 generate a one-dimensional hydrogen-bonded chain. Both 1 and 2 offer high antibacterial activity against Gram-positive bacteria Staphylococcus aureus with MIC values of 0.26 and 0.24 mM and to exhibit good inhibitory activity against urease with the respective IC₅₀ values of 3.5 ± 0.1 and 3.8 ± 0.2 μM.     

Synthesis,crystal structures and properties of two copper(II) 2-aminomethylbenzimidazole complexes

Two new Cu^II complexes, [Cu(Hambi)₂(ClO₄)₂] and [Cu(Hambi)₂(dca)₂] (Hambi = 2-aminomethylbenzimidazole) have been prepared and characterized by X-ray diffraction, electronic paramagnetic resonance (e.p.r.) and i.r. analyses. Both complexes exhibit an elongated octahedral coordination environment with two Hambi ligands situated at the equatorial positions in a trans fashion [Cu—N bond distances range from 1.940(9) to 2.031(9) Å]. In the second complex, a new coordination mode, in which dicyanamide coordinates to copper(II) as a monodentate ligand with the amide nitrogen atom, was observed.     

Synthesis and structures of two mononuclear iron(ii) complexes derived from polypyridine ligands

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Three new binuclear copper(II) complexes with isonicotinic acid N-oxide: syntheses,crystal structures and properties

Three new copper(II) complexes with isonicotinic acid N-oxide (HL) and 1,10-phenanthroline (phen) as ligands, [Cu(L)(phen)(H₂O)]₂(NO₃)₂···2H₂O (1), [Cu(L)(phen)(H₂O)]₂(ClO₄)₂···2H₂O (2), and [Cu(L)(phen)Br]₂- [Cu(L)(phen)(H₂O)]₂Br₂···6H₂O (3) have been synthesized and structurally characterized. The structures of all three complexes feature a Cu₂ dimer formed by two Cu(II) ions interconnected by two bridging ligands. Each copper(II) ion has a distorted square pyramidal coordination geometry with elongated axial coordination by an aqua ligand or halogen anion. The isonicotinic acid N-oxide anion is bidentate, being coordinated to two Cu(II) ions through its N-O oxygen and one of its carboxylate oxygen atoms. Magnetic susceptibility measurements show a Curie–Weiss paramagnetic behavior characteristic of one unpaired electron for a copper(II) ion for all three complexes.     

Copper(I) and silver(I) complexes of 2-amino-1,3,4-thiadiazole and 2-ethylamino-1,3,4-thiadiazole

The following copper(I) and silver(I) complexes of 2-amino-1,3,4-thiadiazole (atz) and 2-ethylamino-1,3,4-thiadiazole (eatz) have been prepared and studied by conductometric, IR and Raman methods: CuXL(X = Cl, Br, I; L = atz, eatz), CuXL₃(X = ClO₄, NO₃; L = atz, eatz), AgClO₄·1.5atz·1/3 EtOH, AgNO₃·2.5atz, AgClO₄·3eatz, AgNO₃·eatz. The ligands are bonded through the amine nitrogen atoms with ν(MN) bands in the 520–410 cm^?1 region. The CuXL complexes have a trigonal (N, 2X_b) coordination with a probable weaker axial interaction. The CuXL₃ and AgCIO₄·3eatz complexes probably have a trigonal pyramidal (3N,O) coordination. In the atz complexes of silver perchlorate and nitrate some ligand molecules are bridging. The AgNO₃·2.5atz complex is likely to have a dimeric structure with tetrahedral coordination of the silver ion.