Copper(ii) halogenopropionates: low-temperature crystal and molecular structure of bis(2,2-dichloropropionato)-di(methyl-3-pyridylcarbamate)copper(ii) and bis(2-bromopropionato)-di (2-pyridylmethanol)copper(ii)

Moncóľ, Ján; Múdra, Marcela; Lönnecke, Peter; Koman, Marián; Melnı́k, Milan

doi:10.1080/00958970412331281836

Cited by 32 publications

(9 citation statements)

References 82 publications

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“…[Cu 3 (CH 3 CHClCOO) 3 (Et 2 LO) 2 (OH) (H 2 O)] 2 (Et 2 LO = 2-diethylaminoethanolate) 10 (6) complex is hexanuclear. Recently, the structures of monononuclear complexes [Cu(CH 3 CCl 2 COO) 2 (3-mpyc) 2 ] (3-mpyc = methyl-3-pyridylcarbamate) at room temperature 11 (7) and at 100 K 12 (8) and [Cu 2 (CH 3 CHBrCOO) 4 (2-pyme) 2 ] (2-pyme = 2-pyridylmethanol) at 208 K 12 (9) were reported. The structure of [Cu( 13 (10) consists of two chemically different units.…”

Section: Introductionmentioning

confidence: 99%

A structural study of copper(II) carboxylates: Crystal structure and physical characterisation of [Cu2(2-bromopropanoato)4(caffeine)2]

et al. 2006

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Based on the bond-valence sum model the continual transition between the bidentate and monodentate bonding mode of carboxylato group and minimum of Cu-O bond lengths were estimated. The dependence of Cu• • •Cu separation on Cu-N bond length in binuclear Cu(II) carboxylates with caffeine were derived and fitted to the observed data. The crystal structure of [Cu 2 (2-bromopropanoato) 4 (caffeine) 2 ] has been determined by X-ray crystallography. The structure consists of centrosymmetric binuclear units where the two Cu atoms are coordinated by four disordered bridging 2-bromopropionates and two caffeine ligands at the apices of a bicapped square prism. Both 2-bromopropionates show disorder of their-Br and-CH 3 substituents. Stacking π • • •π interactions between the adjacent caffeine molecules link the complex units in 1-D networks. The binuclear structure of the studied compound is consistent with magnetic data and EPR spectrum.

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Section: Introductionmentioning

confidence: 99%

A structural study of copper(II) carboxylates: Crystal structure and physical characterisation of [Cu2(2-bromopropanoato)4(caffeine)2]

et al. 2006

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“…The [14] or to another transition metal ion [22]. In most cases, 2-pymet was used as a co-ligand to different carboxylate ligands [23][24][25][26][27]. Compound 3 has no structural analog within the series of Cu complexes.…”

Section: Mononuclear Ionic Compound [Cu(2-pyet) 2 Br]brmentioning

confidence: 99%

Three new copper(II) halides with simple pyridine alcohols

Lah

Leban

2009

Struct Chem

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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) 2 Br 2 , 1, exhibits squareplanar coordination geometry with the axial sites involved in weak bridging contact with the neighboring units to form infinite chains. Reaction of CuBr 2 with 2-pyet leads to an ionic complex [Cu(2-pyet) 2 Br]Br, 2, with distorted squarepyramidal coordination environment: the Cu center in the cation is surrounded by two 2-pyet ligands, coordinated in chelating manner, and a bromide. Reaction of CuCl 2 with 2-pymet resulted in the formation of a dinuclear ionic complex Cu 2 (2-pymet) 4 Cl 2 ]Cl 2 Á2H 2 O, 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.

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“…Additionally, cadmium almost always accompanies zinc usage and production [7], thus studying complexion reaction of the same ligand towards both zinc and cadmium has crucial importance [8]. The halogenacetate anions join advantages of both bulk anions (imposing large sterical hindrance) and multifunctional carboxylate anions (the carboxylates can coordinate in monodentate mode [9,10], can form stable chelates [11,12], can create di-and multinuclear species [13,14] and polymeric compounds with different topologies and dimensionality [15,16]). The dichloroacetate anion (diclac) was chosen as zinc and cadmium counterion due to smaller sterical hindrance (in comparison to trihalogenacetates [2,[17][18][19]) in the region of hydrogen atom and in consequence larger amount of water molecules can coordinate to central metal atom.…”

Section: Introductionmentioning

confidence: 99%

Coordination behaviour of 2,2′-bipyridine towards the dichloroacetates of zinc and cadmium

Kruszyński

2009

Struct Chem

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The coordiantion compounds [Zn(C 10 H 8 N 2 ) (Cl 2 HCCOO)(H 2 O) 3 ] -Á[Zn(C 10 H 8 N 2 )(Cl 2 HCCOO) 3 ] ? and [Cd(C 10 H 8 N 2 ) 2 (Cl 2 CHCOO) 2 ] were synthesised and characterised by elemental and thermal analysis, IR and UV-VIS spectroscopy, and X-ray crystallography. The complexes are air stable and well-soluble in water. The zinc atoms are five and six coordinated and the cadmium atom is six coordinated. The coordination polyhedra of central atoms can be described as trapezoidal pyramid and octahedron in zinc compound and as rectangular bipyramid strongly distorted towards skew trapezoidal bipyramid in cadmium compound. In both compounds all dichloroacetate groups are monodentate. The bond valences considerations show that all 2,2 0 -bipyridine molecules are bonded almost 2 times stronger than carboxylate groups. In the structure of zinc compound exist O-HÁÁÁO hydrogen bonds and in both structures can be found weak C-HÁÁÁO hydrogen bonds. Additionally, both compounds are pile-stacked by pÁÁÁp interactions. The IR spectra show typical vibrations for chelating 2,2 0 -bipyridine molecules and terminal monodentate carboxylate groups. The thermal decomposition studies show zinc compound decomposes in 4 steps and cadmium compound decomposes in 5 steps with formation of oxides as a final products. The ligands decompose gradually, first dichloroacetates and next 2,2 0 -bipyridine.

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Copper(ii) halogenopropionates: low-temperature crystal and molecular structure of bis(2,2-dichloropropionato)-di(methyl-3-pyridylcarbamate)copper(ii) and bis(2-bromopropionato)-di (2-pyridylmethanol)copper(ii)

Cited by 32 publications

References 82 publications

A structural study of copper(II) carboxylates: Crystal structure and physical characterisation of [Cu2(2-bromopropanoato)4(caffeine)2]

A structural study of copper(II) carboxylates: Crystal structure and physical characterisation of [Cu2(2-bromopropanoato)4(caffeine)2]

Three new copper(II) halides with simple pyridine alcohols

Coordination behaviour of 2,2′-bipyridine towards the dichloroacetates of zinc and cadmium

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