Reaction Of CuCl2 Research Articles

Complex of CuII with a chiral Schiff base (H2L) derived from the natural monoterpene (+)-6h-pinene. Synthesis and the properties of the complex and its solvate with acetonitrile. Crystal structure of [Cu(HL)Cl]•H2O

A reaction of CuCl2 with a chiral Schiff base (H2L) derived from (+)-6h-pinene leads to paramagnetic complex Cu(HL)Cl (1) (fueff = 2.03 fuB) and solvate Cu(HL)Cl•MeCN (2) (fueff = 1.87 fuB). Monocrystals of hydrate [Cu(HL)Cl]•H2O (3) were grown for the X-ray diffraction study, which showed that the crystal structure of 3 consists of the molecules of a mononuclear complex [Cu(HL)Cl] containing tridentate chelating ligand HL—, and water molecules. Coordination polyhedron ClNO2 is a distorted tetrahedron. Intermolecular con- tacts in the structure 3 lead to the formation of supramolecular chains, parallel to the axis -6h. Compounds 1 and 2 were studied by ESR and IR spectroscopy.

In Situ C−C Coupling and Formation of a Heptanuclear Copper(II) Cluster

The reaction of CuCl(2) with H(2)Meppz and a base under low temperature gave rise to a heptanuclear copper compound, in which a novel ligand 2,2'-bis(H(2)Meppz) (H(4)L') was obtained through in situ C-C coupling.

A short, unsupported Cu(i)⋯Cu(i) interaction, 2.65 Å, in a dinuclear guanidine chloride complex

The reaction of CuCl with the neutral guanidine Hhpp ligand (1,3,4,6,7,8-hexahydropyrimido[1,2-a]pyrimidine) yields two crystalline polymorphs of the neutral dimer, bis(1,3,4,6,7,8-hexahydropyrimido[1,2-a]pyrimidine) dichloro-di-copper(I) with the shortest distance known for a bridging unsupported copper(I)-copper(I) interaction.

Three new copper(II) halides with simple pyridine alcohols

Three Cu(II) halido complexes of 3-pyridinepropanol (3-pyprop), 2-pyridineethanol (2-pyet), and 2-pyridinemethanol (2-pymet) have been prepared and investigation of their crystal structures undertaken. All the reported products contain simple pyridine alcohols as neutral ligands. Cu(3-pyprop)2Br2, 1, exhibits square-planar coordination geometry with the axial sites involved in weak bridging contact with the neighboring units to form infinite chains. Reaction of CuBr2 with 2-pyet leads to an ionic complex [Cu(2-pyet)2Br]Br, 2, with distorted square-pyramidal coordination environment: the Cu center in the cation is surrounded by two 2-pyet ligands, coordinated in chelating manner, and a bromide. Reaction of CuCl2 with 2-pymet resulted in the formation of a dinuclear ionic complex Cu2(2-pymet)4Cl2]Cl2·2H2O, 3. The centrosymmetric cation consisted of two Cu ions doubly bridged by chlorides and coordinated by chelating 2-pymet ligands. The positive charge is balanced by free chlorides involved in hydrogen bonds with the lattice water molecules.

Di-μ-chlorido-bis(chlorido{2,2′-[3-(1H-imidazol-4-ylmethyl)-3-azapentane-1,5-diyl]diphthalimide}copper(II))

The centrosymmetric dinuclear CuII complex, [Cu2Cl4(C24H21N5O4)2], was synthesized by the reaction of CuCl2·2H2O with the tripodal ligand 2,2′-[3-(1H-imid­azol-4-ylmeth­yl)-3-aza­pentane-1,5-di­yl]diphthalimide (L). Each of the CuII ions is coordinated by two N atoms from the ligand, two bridging Cl atoms and one terminal Cl atom. The CuII coordination can be best be described as a transition state between four- and five-coordination, since one of the bridging Cl atoms has a much longer Cu—Cl bond distance [2.7069 (13) Å] than the other [2.2630 (12) Å]. In addition, the Cu⋯Cu distance is 3.622 (1) Å. The three-dimensional structrure is generated by N—H⋯O, C—H⋯O and C—H⋯Cl hydrogen bonds and π–π inter­actions [centroid–centroid distances = 3.658 (4) and 4.020 (4) Å].

Synthesis of Copper(I) Complexes Containing Enantiopure Pybox Ligands. First Assays on Enantioselective Synthesis of Propargylamines Catalyzed by Isolated Copper(I) Complexes

Dinuclear [Cu(2)(R-pybox)(2)][X](2) [X = PF(6), R-pybox = 2,6-bis[4'-(S)-isopropyloxazolin-2'-yl]pyridine (S,S)-(i)Pr-pybox (1), 2,6-bis[4'-(R)-phenyloxazolin-2'-yl]pyridine) (R,R)-Ph-pybox (2), 2,6-bis[4'-(S)-isopropyl-5',5'-difeniloxazolin-2'-yl]pyridine (S,S)-(i)Pr-pybox-diPh (3); X = OTf, (R,R)-Ph-pybox (4)] and mononuclear complexes [Cu(R-pybox)(2)][PF(6)] [R-pybox = (S,S)-(i)Pr-pybox (5), (R,R)-Ph-pybox (6)] have been diastereoselectively prepared by reaction of [Cu(MeCN)(4)][PF(6)] or CuOTf.0.5C(6)H(6) and the corresponding pybox ligand. The reaction of CuX (X = I, Br, Cl) with substituted pybox in a 2:1 molar ratio allows us to synthesize tetranuclear complexes [Cu(4)X(4)(R-pybox}(2)] [R-pybox = (S,S)-(i)Pr-pybox, X = I (7), Br (8); (R,R)-Ph-pybox, X = I (9), Br (10), Cl (11); (S,S)-(i)Pr-pybox-diPh, X = I (12), Cl (13)]. Dinuclear complexes [Cu(2)(mu-Cl)(R-pybox)(2)][CuCl(2)] [R-pybox = (S,S)-(i)Pr-pybox (15), (R,R)-Ph-pybox (16)] have been prepared by reaction of CuCl with (i)Pr-pybox or Ph-pybox in 3:2 molar ratio. The structures of the complexes 1, 2, 7, 15, 16 and that of the polymeric species [Cu(4)(mu(3)-Br)(3)(mu-Br)((i)Pr-pybox)](n) (14) have been determined by single-crystal X-ray diffraction analysis. Diffusion studies using (1)H and (19)F-DOSY experiments provide evidence that the different nuclearity of compounds 1 and 5 is maintained in the solution state and confirm that these ionic compounds exist in solution as stable, discrete, cationic complexes. The complexes 1-4, 6, 9, 10, and 16 as well as the previously reported [Cu(2){(S,S)-(i)Pr-pybox}(2)][OTf](2) have been assayed as catalysts in the enantioselective synthesis of propargylamines. The dinuclear complexes [Cu(2){(R,R)-Ph-pybox}(2)][X](2) (2, 4) were found to be the most efficient catalysts (up to 89% e.e.).

Characterization of copper sulfide nanostructured spheres and nanotubes synthesized by microwave-assisted solvothermal method

Copper sulfide nanostructured spheres and nanotubes were successfully synthesized, using a microwave-assisted solvothermal method, by the decomposition of [Cu(CH 3CSNH 2) 2]Cl 2 complexes, formed by the reaction of CuCl 2·2H 2O and CH 3CSNH 2 in ethylene glycol at different pH values, and identified by CHNS/O and FTIR analyses. The decrease in bonding energy of N–H revealed the coordination of copper ions and thioacetamide molecules. It was specified that nitrogen atoms of thioacetamide molecules were used to form Cu–thioacetamide complexes. XRD, SEM, TEM and SAED analyses show that the products were hexagonal CuS spheres in an extremely low pH solution, and hexagonal CuS nanotubes at a pH 13. Their Raman spectra show sharp peaks at 473 cm − 1 , identified as the S–S stretching mode of S 2 ions at the 4e sites.

Diaquadichlorido[5-(3-pyridinio)tetrazolato-κN2]copper(II) dihydrate

The title compound, [CuCl2(C6H5N5)2(H2O)2]·2H2O, was synthesized by hydro­thermal reaction of CuCl2 with 3-(2H-tetra­zol-5-yl)pyridine. The CuII cation, located on an inversion center, is coordinated by two Cl− ions, two N atoms from two 5-(3-pyridinio)tetra­zolate zwitterions and two O atoms from two water mol­ecules in a distorted octa­hedral geometry. In the crystal, mol­ecules are linked into a two-dimensional sheet parallel to (001) by N—H⋯N, O—H⋯N, O—H⋯O and O—H⋯Cl hydrogen bonds involving the pyridinium N atom, the Cl atoms and the coordinated and free water mol­ecules. The latter are disordered over two positions in a 0.54:0.46 ratio.

Synthesis, characterization, and crystal structure determination of Cu(II) coordination compounds with 2,2′-dimethyl-4,4′-bithiazole

[{CuCl(dm4bt)}2 μ-Cl)2] (1) (dm4bt = 2,2′-dimethyl-4,4′-bithiazole) was prepared from the reaction of CuCl2 · 2H2O with 2,2′-dimethyl-4,4′-bithiazole in methanol; [Cu(dm4bt)2NO3](NO3) (2) was prepared from the reaction of Cu(NO3)2 · 3H2O with 2,2′-dimethyl-4,4′-bithiazole in methanol. Both complexes were characterized by IR, UV–Vis spectroscopy, and single-crystal structure. The structure of 1 consists of centrosymmetric dimeric [{CuCl(dm4bt)}(μ-Cl)], in which two chloro ligands bridge the coppers forming a four-membered ring; a terminal chloride and a bidentate chelating bithiazole complete five coordination at each Cu(II) in a highly distorted trigonal-bipyramidal geometry. The mononuclear structure 2 consists of a Cu(II), two 2,2′-dimethyl-4,4′-bithiazoles, one monodentate nitrate and one uncoordinated nitrate in a highly distorted square pyramid.

Syntheses, crystal structures and fluorescent properties of R, R-DIOP based copper (I) and cadmium (II) complexes { R, R-DIOP = (4 R,5 R)- trans-4,5-bis(diphenylphosphinomethyl)-2,2-dimethyl-1,3-dioxalane}

Two chiral complexes, [CuCl( R, R-DIOP)] 2 ( 1) and [CdCl 2( R, R-DIOP)] n ( 2), have been synthesized by reaction of CuCl or CdCl 2 with chiral diphosphine ligand R, R-DIOP under argon. They were characterized by elemental analysis, IR, UV–vis, fluorescence spectra and single-crystal X-ray diffraction. X-ray analysis indicates that the metal centers (Cu I for 1 and Cd II for 2) are both in distorted tetrahedral environment, but 1 is a binuclear complex in which Cu I ions are surrounded by two μ 2-bridging chloride ions and two bismonodentate coordinated R, R-DIOP ligands; while 2 is a helical polymer along b axis and each Cd II ion is coordinated with two chloride ions and two P atoms of two μ 2-bridging R, R-DIOP ligands. Both of them crystallize in monoclinic system, space group P 21, with a = 9.8855(7) Å, b = 37.857(3) Å, c = 23.9585(16) Å, β = 92.0920(10)°, Z = 6 for ( 1) and a = 10.1740(8) Å, b = 13.9899(11) Å, c = 11.4007(9) Å, β = 108.3690(10)°, Z = 2 for ( 2). Fluorescence measurements show that complex 1 can emits much strong blue emission than 2 at room temperature in the solid state.

Strong antiferromagnetic coupling in doubly N, O oximato-bridged dinuclear copper(II) complexes

The use of di-2-pyridyl ketone oxime, (py)pkoH, and phenyl 2-pyridyl ketone oxime, ppkoH, in copper(II) hexafluoroacetylacetonate chemistry is reported. The reaction of CuCl 2·2H 2O with one and two equivalents of ppkoH and Na(hfac), respectively, in CH 2Cl 2 affords the dinuclear complex [Cu 2(hfac) 2(ppko) 2] ( 1) in excellent yield. The replacement of ppkoH by (py)pkoH gives the isostructural compound [Cu 2(hfac) 2{(py)pko} 2] ( 2) in good yield. The Cu II atoms in both 1 and 2 are doubly bridged by the oximate groups of two η 1:η 1:η 1:μ 2 ppko − and (py)pko − ligands, respectively. The bridging Cu–(R–NO)–Cu′ units are not planar, with the torsion angles being 23.2° ( 1) and 20.3° ( 2). A bidentate chelating hfac − ligand completes five-coordination at each square pyramidal metal ion. The hfac −-free reaction system CuCl 2·2H 2O/(py)pkoH/NEt 3 (1:2:1) gives instead the mononuclear complex [CuCl{(py)pko}{(py)pkoH}] ( 3) in very good yield. The Cu II atom is coordinated by two N, N′-bidentate (py)pko −/(py)pkoH chelates and a monodentate chloride anion resulting in a distorted square pyramidal geometry around the metal center. Variable-temperature, solid-state dc magnetic studies were carried out on the representative dinuclear complex 1 in the 2.0–300 K range. The data indicate a very strong antiferromagnetic exchange interaction and a resulting S = 0 ground state, which is well isolated from the S = 1 excited state. The J value of −720 cm −1 was derived from the fitting of the experimental data using the Hamiltonian H = − J( S 1 · S 2).

Strong CO2 Binding in a Water-Stable, Triazolate-Bridged Metal−Organic Framework Functionalized with Ethylenediamine

Reaction of CuCl(2) x 2 H(2)O with 1,3,5-tris(1H-1,2,3-triazol-5-yl)benzene (H(3)BTTri) in DMF at 100 degrees C generates the metal-organic framework H(3)[(Cu(4)Cl)(3)(BTTri)(8)(DMF)(12)] x 7 DMF x 76 H(2)O (1-DMF). The sodalite-type structure of the framework consists of BTTri(3-)-linked [Cu(4)Cl](7+) square clusters in which each Cu(II) center has a terminal DMF ligand directed toward the interior of a large pore. The framework exhibits a high thermal stability of up to 270 degrees C, as well as exceptional chemical stability in air, boiling water, and acidic media. Following exchange of the guest solvent and bound DMF molecules for methanol to give 1-MeOH, complete desolvation of the framework at 180 degrees C generated H(3)[(Cu(4)Cl)(3)(BTTri)(8)] (1) with exposed Cu(II) sites on its surface. Following a previously reported protocol, ethylenediamine molecules were grafted onto these sites to afford 1-en, featuring terminal alkylamine groups. The N(2) adsorption isotherms indicate a reduction in the BET surface area from 1770 to 345 m(2)/g following grafting. The H(2) adsorption data at 77 K for 1 indicate a fully reversible uptake of 1.2 wt % at 1.2 bar, while the CO(2) isotherm at 195 K shows a maximal uptake of 90 wt % at 1 bar. Compared to 1, the alkylamine-functionalized framework 1-en exhibits a higher uptake of CO(2) at 298 K and pressures up to ca. 0.1 bar, as well as a higher CO(2)/N(2) selectivity at all measured pressures. Significantly, 1-en also exhibits an isosteric heat of CO(2) adsorption of 90 kJ/mol, which is much higher than the 21 kJ/mol observed for 1. This chemisorption interaction is the strongest reported to date for a metal-organic framework and points toward the potential utility of alkylamine-appended frameworks for the postcombustion capture of CO(2) from low-pressure flue gas streams.

Tri-, Tetra-, and Hexanuclear Copper(II) Phosphonates Containing N-Donor Chelating Ligands: Synthesis, Structure, Magnetic Properties, and Nuclease Activity

Reaction of Cu(ClO(4))(2).6H(2)O with cyclopentyl phosphonic acid and 2,2'-bipyridine (bpy) in presence of triethylamine afforded a trinuclear compound [Cu(3)(C(5)H(9)PO(3))(2)(bpy)(3)(MeOH)(H(2)O)](ClO(4))(2) (2). The latter dimerizes to a hexanuclear derivative [Cu(6)(C(5)H(9)PO(3))(4)(bpy)(6)(MeOH)(4)](ClO(4))(4) (1) under prolonged reaction conditions. Reaction of CuCl(2) with cyclopentyl phosphonic acid and 2,2'-bipyridylamine (bpya) affords a tetranuclear derivative [Cu(4)(C(5)H(9)PO(3))(2)(mu-Cl)(2)(bpya)(4)](Cl)(2), (MeOH)(2) (3). Reaction of the latter with NaClO(4) also affords a trinuclear compound [Cu(3)(C(5)H(9)PO(3))(2)(mu-Cl)(bpya)(3)(H(2)O)](ClO(4)) (4). Double and single-bridged hexanuclear species, [{Cu(3)(C(5)H(9)PO(3))(2)(bpy)(3)(bpp)}(MeOH)(2)(H(2)O)(CH(2)Cl(2))(ClO(4))(2)](2) (5), [{Cu(3)(i-PrPO(3))(2)(bpy)(3)(4.4'-bpy)(H(2)O)}(H(2)O)(2)(ClO(4))(2)](2) (6), [{Cu(3)(C(5)H(9)PO(3))(2)(bpya)(3)(4.4'-bpy)(H(2)O)}(MeOH)(H(2)O)(ClO(4))(2)](2) (7), and [Cu(6)(t-BuPO(3))(4)(phen)(6)(4,4'-bpy)(MeOH)(4)](CH(2)Cl(2))(H(2)O)(ClO(4))(4) (8) (phen = 1,10-phenanthroline) were obtained by the reaction of an in situ generated trinuclear complex with appropriate bridging ligands 4,4'-bipyridine (4,4'-bpy) or 1,3-bis(4-pyridyl)propane (bpp). ESI-MS studies of these complexes reveal that 2-4 retain their structures in solution. Molecular structures of 2-8 were determined by X-ray crystallography. All the compounds reveal a capping coordination mode by tridentate phosphonate [RPO(3)](2-) ligands. Detailed magnetic studies on 2 and 4-8 reveal intramolecular antiferromagnetic interactions between Cu(II) S = 1/2 spins. 2 and 4 are excellent artificial nucleases and can convert supercoiled plasmid DNA (pBR322) into its nicked form without the aid of an external oxidant.

A Tetranuclear CuII-Based 2D Aggregate with an Unprecedented Tetradentate μ4-N1,N3,N7,N9-Adeninate Nucleobase

A unique tetranuclear Cu(II)-based 2D aggregate containing 26-membered Cu(II)ade macrocycles, [Cu(4)(DMF)(6)(mu(4)-ade)(2)(mu(2)-Cl)(2)Cl(4)](n) (1; Hade = adenine, DMF = N,N-dimethylformamide), was isolated by the reaction of CuCl(2) and Hade in a mixed DMF-methanol medium and structurally characterized by X-ray crystallography, elemental analysis, Fourier transform infrared, fluorescence spectroscopy, and thermogravimetry-differential thermal analysis techniques. Unexpectedly, the adeninate in 1 represents an unprecedented tetradentate mu(4)-N1,N3,N7,N9-bridging mode, which significantly contributes to both the aggregate of four Cu(II) cores within the subunit and the extension of the 2D covalent framework. Additionally, 1 displays the intense Hade-based fluorescence emission in solution at room temperature.

High-dimensional mixed-valence copper cyanide complexes: Syntheses, structural characterizations and magnetism

Reactions of CuCl 2 with different CN complexes in presence of a neutral ancillary ligand lead to two novel mixed-valence Cu complexes [Cu II(bpy)Cu I(CN) 3] n , 1 (bpy = 2,2′-bipyridine) and {[Cu II(tn) 2][Cu I 4(CN) 6]} n 2 (tn = 1,3-diaminopropane). For compound 1, the asymmetric unit involves two Cu ions Cu1 and Cu2 (Cu I and Cu II centres, respectively) which strongly differ in their environments. The Cu1 ion presents a CuC 4 pseudo-tetrahedral geometry, while the Cu2 ion presents a CuN 5 slightly distorted square-pyramidal geometry. The extended structure of 1 is generated by three cyano ligands which differ in their coordination modes. One CN group has a μ 3 coordination mode and bridges two Cu I and one Cu II ion, while the two other CN groups act as μ 2 bridges leading to a sophisticated 3-D structure. As for 1, the asymmetric unit of 2 involves three crystallographically different Cu ions (Cu1A and Cu1B, presumably Cu I centres, and Cu2 presumably Cu II centres). The Cu2 ion presents centrosymmetric CuN 4 coordination environments involving four nitrogen atoms from two bidentate tn ligands; while the Cu1A and Cu1B ions are three coordinated to cyano groups. The structure can be described as formed by 18-membered “[Cu I(CN)] 6” planar metallocycles that are connected to their six neighbors to generate 2-D sheets; these sheets stack forming infinite hexagonal channels in which the [Cu(tn) 2] 2+ units are located. Magnetic measurements show an unexpected weak ferromagnetic coupling ( θ = 0.239(1) K) of the Cu II ions through the long and “a priori diamagnetic” –NC–Cu I–CN– bridges in compound 1 and an essentially paramagnetic behavior in compound 2.

Reactivity of Thiosemicarbazides with Redox Active Metal Ions: Controlled Formation of Coordination Complexes versus Heterocyclic Compounds

The reactions of 1,1-dimethyl-4-phenylthiosemicarbazide (LH) with Cu(II) and Sn(IV) have been investigated. If THF or methanol is used as solvent with Cu(II), oxidative cyclisation and coupling are observed, yielding a 1,2,4-thiadiazole or a 1,3,4-thiadiazolium salt. SnI(4) is also able to induce oxidative coupling of two thiosemicarbazide ligands, yielding 1,2,4-thiadiazolium or 1,2,4-triazolium salts, with I(3)(-) as the counterion, depending on the reaction conditions. By contrast, reaction of LH with SnI(4) in acetone yields a 1,3-thiazolium salt, with I(-) as counterion. Reaction with Cu(II) salts or SnI(4) in basic media leads to the formation of metal complexes containing two deprotonated thiosemicarbazide ligands. In the reaction of CuCl(2) in water in the presence of acid a complex containing two neutral ligands is obtained. Reactions with SnCl(4) are not able to induce ligand cyclisation, although a coordination compound with two neutral ligands was isolated from methanol.

Imidazole–imidazole stacking in some inorganic complexes

Reaction of CuCl 2 · 2H 2O with the 1:1 condensate (L) of 2-(2-aminoethyl)pyridine and 1-methyl-2-imidazolecarboxaldehyde in methanol yields monomeric CuLCl 2.H 2O ( 1). Recrystallisation of 1 from aqueous methanol medium containing excess of PF 6 − affords the 1D coordination polymer [CuLCl] n (PF 6) n ( 2). A chloride bridge results in the coordination polymer. A face-to-face interaction is observed between the imidazole rings in 2. The interaction influences the structure and magnetic properties of 2 markedly. The complex 2 is ferromagnetic with a J value of 1.79 ± 0.01 cm −1. The imidazole fragments in 2 are coordinated to the metal. In mononuclear [ HgL 2 ″ ] (ClO 4) 2, where L′′ is the 1:2 condensate of ethylenediamine and 1-methyl-2-imidazolecarboxaldehyde, the imidazolyl moieties are not under the direct influence of the metal. Here the imidazole – imidazole interaction is angular and more distant.

Structural diversity in the reactions of 4′-(pyridyl)-2,2′:6′,2″-terpyridine ligands and bis{4′-(4-pyridyl)-2,2′:6′,2″-terpyridine}iron(II) with copper(II) salts

We have demonstrated that treatment of [Fe(1)2]2+ (1 = 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine) with an excess of CuCl2·2H2O leads to competition between coordination of copper(II) by the pendant pyridine donors in [Fe(1)2]2+, and transfer of ligand 1 from iron(II) to copper(II) to yield [{Cl3Cu(µ-1)Fe(µ-1)}2CuCl2(OH2)2]Cl2·4H2O and [Cu(H1)Cl2]Cl·4H2O, respectively. Direct reaction of 1 with CuCl2·2H2O and variation in crystallization conditions results in the formation of either monomeric or polymeric complexes: [Cu(1)Cl2]·4.75H2O, [Cu(1)Cl2]·H2O·MeOH and [Cu(1)Cl2·2H2O]n. The reaction of 1 with Cu(NO3)2·3H2O gives the coordination polymer [Cu(1)(ONO2)2·H2O]n. Magnetic data for [Cu(1)Cl2·2H2O]n and [Cu(1)(ONO2)2·H2O]n are consistent with antiferromagnetically-coupled chains. Reactions of CuCl2·2H2O with ligands 2 and 3 (2 = 4′-(3-pyridyl)-2,2′:6′,2″-terpyridine, 3 = 4′-(2-pyridyl)-2,2′:6′,2″-terpyridine) lead to monomeric complexes. With the exception of [Cu(3)Cl2], the mononuclear complexes show a propensity for the incorporation of water into their crystal lattices; in the case of [Cu(H1)Cl2]Cl·4H2O and [Cu(H1)Cl2]Cl·4.75H2O, the small change in water content leads to the assembly of (5.82)2(5.6.8)4(52.6)2 or (42.62)3(4.62)6water–chloride ion nets.

Synthesis of [Cu(dipic)(4-picoline)]n Possessing 1D Coordination Polymeric Structure and Single Crystal X-ray Studies

The title complex was synthesized from the reaction of CuCl2·2H2O, pyridine-2,6-dicarboxylic acid (H2dipic) and 4-picoline in 1:1:1 mole ratio. It crystallizes in the monoclinic system (space group C2/c) with unit-cell parameters: a = 20.945(5)A, b = 14.358(5)A, c = 12.976(4)A and β = 113.356(7)°. The molecule packs in a non-centrosymmetric manner aligned parallel in a head-to-tail motif involving carboxylate bridging to form 1D polymeric structure, where the Cu1-Cu2 separation is 5.1022 ± 0.0013 A.

Synthesis and crystal structure of copper(II) complex with Schiff base from salicylaldehyde and 1,2-phenylenediamine

A new complex [Cu(saloph)]{[Cu(salobp) 2 ]Cl} (1) was synthesized by the reaction of CuCl and the Schiff base ligand (saloph) derived from salicylaldehyde and 1,2-phenylenediamine. Under hydrothermal conditions, in the presence of Cu 1 ion and methanol, saloph is converted into the benzimidazole ligand (salobp). The single crystal X-ray diffraction analyses reveal that 1 contains discrete [Cu(saloph)] (A), [Cu(salobp) 2 ]Cl (B) in the asymmetric unit. In A, the geometry around the Cu II is almost square planar with two nitrogens and two oxygens from saloph providing the tetradentate coordination, while in B, the geometry around the Cull is linear with two nitrogens from two different monodentate benzimidazole ligands (salobp).