Synthesis, crystal structure and magnetism of three novel copper(II) complexes with pyrazole-based ligands

Synthesis, crystal structure and magnetism of three novel copper(II) complexes with pyrazole-based ligands

► Monomeric copper(II) complex with pyrazole derivative ligands. ► The metal ions display cis and trans conformation depending on the ligand. ► A network of intermolecular interactions stabilizes the crystal packing. ► Magnetic measurements reveal weak antiferromagnetic interactions. In this work we...

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Published in:Journal of molecular structure Vol. 1011; pp. 99 - 104
Main Authors: Santos, Igor F., Guedes, Guilherme P., Mercante, Luiza A., Bernardino, Alice M.R., Vaz, Maria G.F.
Format: Journal Article
Language:English
Published: Elsevier B.V 14-03-2012
Subjects:
Chloride ions
copper
Copper(II) complex
Coupling (molecular)
Crystal structure
Distortion
ions
Ligands
Magnetic properties
magnetism
Molecular magnetism
Molecular structure
nitrogen
Pyrazole
Synthesis
Copper(II) complex
Molecular magnetism
Pyrazole
Crystal structure
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Abstract ► Monomeric copper(II) complex with pyrazole derivative ligands. ► The metal ions display cis and trans conformation depending on the ligand. ► A network of intermolecular interactions stabilizes the crystal packing. ► Magnetic measurements reveal weak antiferromagnetic interactions. In this work we present the synthesis, crystal structure and magnetic properties of three copper(II) pyrazole-based complexes. These compounds were prepared by reactions between the ligands (L1 = 5-amino-1-phenyl-1H-pyrazole-4-carbonitrile, L2 = 5-amino-1-(4’metoxiphenyl)-1H-pyrazole-4-carbonitrile and L3 = Ethyl 5-amino-1-phenyl-1H-pyrazole-4-carboxylate) and CuCl2·2H2O using an appropriate solvent. The crystalline structures of [Cu(L1)2Cl2] (1), [Cu(L2)2Cl2] (2) and [Cu(L3)2Cl2] (3) showed that copper ion is coordinated by two pirazolic ligands through pyridinic nitrogen atom and two chloride ions in a distorted square-planar geometry. The magnetic measurements revealed a paramagnetic behavior for (1) and weak antiferromagnetic coupling between copper(II) ions in (2) and (3). Due to the presence of labile chloride ions in the structures, these monomeric copper(II) complexes may be used as building blocks in the synthesis of molecular magnetic compounds.
AbstractList In this work we present the synthesis, crystal structure and magnetic properties of three copper(II) pyrazole-based complexes. These compounds were prepared by reactions between the ligands (L1 = 5-amino-1-phenyl-1H-pyrazole-4-carbonitrile, L2 = 5-amino-1-(4’metoxiphenyl)-1H-pyrazole-4-carbonitrile and L3 = Ethyl 5-amino-1-phenyl-1H-pyrazole-4-carboxylate) and CuCl₂·2H₂O using an appropriate solvent. The crystalline structures of [Cu(L1)₂Cl₂] (1), [Cu(L2)₂Cl₂] (2) and [Cu(L3)₂Cl₂] (3) showed that copper ion is coordinated by two pirazolic ligands through pyridinic nitrogen atom and two chloride ions in a distorted square-planar geometry. The magnetic measurements revealed a paramagnetic behavior for (1) and weak antiferromagnetic coupling between copper(II) ions in (2) and (3). Due to the presence of labile chloride ions in the structures, these monomeric copper(II) complexes may be used as building blocks in the synthesis of molecular magnetic compounds.
In this work we present the synthesis, crystal structure and magnetic properties of three copper(II) pyrazole-based complexes. These compounds were prepared by reactions between the ligands (L1 = 5-amino-1-phenyl-1H-pyrazole-4-carbonitrile, L2 = 5-amino-1-(4'metoxiphenyl)-1H-pyrazole-4-carbonitrile and L3 = Ethyl 5-amino-1-phenyl-1H-pyrazole-4-carboxylate) and CuCl2.2H2O using an appropriate solvent. The crystalline structures of [Cu(L1)2Cl2] (1), [Cu(L2)2Cl2] (2) and [Cu(L3)2Cl2] (3) showed that copper ion is coordinated by two pirazolic ligands through pyridinic nitrogen atom and two chloride ions in a distorted square-planar geometry. The magnetic measurements revealed a paramagnetic behavior for (1) and weak antiferromagnetic coupling between copper(II) ions in (2) and (3). Due to the presence of labile chloride ions in the structures, these monomeric copper(II) complexes may be used as building blocks in the synthesis of molecular magnetic compounds.
► Monomeric copper(II) complex with pyrazole derivative ligands. ► The metal ions display cis and trans conformation depending on the ligand. ► A network of intermolecular interactions stabilizes the crystal packing. ► Magnetic measurements reveal weak antiferromagnetic interactions. In this work we present the synthesis, crystal structure and magnetic properties of three copper(II) pyrazole-based complexes. These compounds were prepared by reactions between the ligands (L1 = 5-amino-1-phenyl-1H-pyrazole-4-carbonitrile, L2 = 5-amino-1-(4’metoxiphenyl)-1H-pyrazole-4-carbonitrile and L3 = Ethyl 5-amino-1-phenyl-1H-pyrazole-4-carboxylate) and CuCl2·2H2O using an appropriate solvent. The crystalline structures of [Cu(L1)2Cl2] (1), [Cu(L2)2Cl2] (2) and [Cu(L3)2Cl2] (3) showed that copper ion is coordinated by two pirazolic ligands through pyridinic nitrogen atom and two chloride ions in a distorted square-planar geometry. The magnetic measurements revealed a paramagnetic behavior for (1) and weak antiferromagnetic coupling between copper(II) ions in (2) and (3). Due to the presence of labile chloride ions in the structures, these monomeric copper(II) complexes may be used as building blocks in the synthesis of molecular magnetic compounds.
Author Santos, Igor F.
Bernardino, Alice M.R.
Mercante, Luiza A.
Vaz, Maria G.F.
Guedes, Guilherme P.
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Molecular magnetism
Pyrazole
Crystal structure
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Snippet ► Monomeric copper(II) complex with pyrazole derivative ligands. ► The metal ions display cis and trans conformation depending on the ligand. ► A network of...
In this work we present the synthesis, crystal structure and magnetic properties of three copper(II) pyrazole-based complexes. These compounds were prepared by...
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SubjectTerms Chloride ions
copper
Copper(II) complex
Coupling (molecular)
Crystal structure
Distortion
ions
Ligands
Magnetic properties
magnetism
Molecular magnetism
Molecular structure
nitrogen
Pyrazole
Synthesis
Title Synthesis, crystal structure and magnetism of three novel copper(II) complexes with pyrazole-based ligands
URI https://dx.doi.org/10.1016/j.molstruc.2011.12.036
https://search.proquest.com/docview/1019623059
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