Molecular structure and intra- and intermolecular magnetic interactions in chloro-bridged copper(II) dimers

Alves, Wendel A.; Santos, Regina Helena de Almeida; Paduan-Filho, A.; Becerra, C. C.; Borin, Antonio Carlos; Ferreira, Ana Maria da Costa

doi:10.1016/j.ica.2004.01.004

Cited by 94 publications

(45 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This increased lipophilicity enhances the penetration of the complexes into lipid membrane and blocks the metal binding sites on enzymes of microorganisms. The diameter zones of inhibition of the ligands and its binuclear copper(II) complexes are shown in the 3 ] is in accordance with the elemental analysis, conductance and thermal data. In these complexes each copper(II) atom is located in the centre of a distorted square pyramidal configuration of five coordinating atoms.…”

Section: Antibacterial Studiessupporting

confidence: 80%

See 1 more Smart Citation

Synthesis, Characterization and Antibacterial Studies on Copper(II) Binuclear Complexes with Substituted Piperidin-4-ones

Theivarasu¹,

Sivaprakash²

2012

Orientjchem.

View full text Add to dashboard Cite

Copper(II) Chloride binuclear complexes with variously substituted 2,6-diphenly piperidin-4-ones [Cu 2 LCl 4 (H 2 O) 3 ] have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, thermal and spectral studies. Molar conductance data show that these complexes are non-electrolytes. The presence of three coordinated water molecules is confirmed by thermal and infrared spectral studies. IR spectral data indicate that the piperidin-4-ones are monodentate and coordinate only through ring nitrogen. The electronic spectral and magnetic studies suggest distorted square-pyramidal environment for Cu(II) complexes. Antibacterial activities of the ligands and their complexes have been tested against bacterial culture by disc diffusion method. It has been found that all the complexes have higher activity than the free ligands.

show abstract

Section: Antibacterial Studiessupporting

confidence: 80%

“…1984 between the two metal ions, leading to the design of molecular magnetic materials 3 . The research on the coordination chemistry of transition metal complexes with piperidin-4-one ligands has rapidly progressed in recent years.…”

Section: Oriental Journal Of Chemistrymentioning

confidence: 99%

Synthesis, Characterization and Antibacterial Studies on Copper(II) Binuclear Complexes with Substituted Piperidin-4-ones

Theivarasu¹,

Sivaprakash²

2012

Orientjchem.

View full text Add to dashboard Cite

show abstract

“…The magnetic coupling in dichloro-bridged Cu 2+ complexes is very sensitive to the Cu-Cl-Cu angles, Cu-Cl distances, and distortions around the Cu 2+ ions, dramatically varying from antiferromagnetic to ferromagnetic interactions with small structural changes. [42][43][44][45][46][47] The ferromagnetic coupling between the Cu 2+ ions is also found in dichlorobridged dimers [31,32,[43][44][45][46][47] and chains [14,34] reported in the literature. In this work, two Cu-Cl-Cu angles of 5a are in the middle of the range for bis(μ-chloro)Cu 2+ dimer complexes, [31] which have the possibility of ferromagnetic and antiferromagnetic interactions in the intrachain structure.…”

Section: Magnetic Properties and Vapochromismmentioning

confidence: 59%

Transformation of a Cu^II Thiazolo‐1,2,4‐triazine Derivative from a Metastable Coordination Network to a Monomer in Solution and Vapor Conditions

et al. 2011

View full text Add to dashboard Cite

Although mononuclear complexes were mainly obtained from Cu 2+ ion and phenyl-, ethyl-or benzyl-substituted thiazolo-1,2,4-triazine derivatives, unique metastable orangeyellow crystals [CuCl 2 (3a)] n (5a; Cu/3a = 1:1) with the phenyl-substituted derivative 3a were obtained as a 1D coordination polymer through bis(μ-chloro) linkages in a 2-propanol solution. The crystals show dynamic and irreversible structural transformation into blue crystals of [CuCl 2 (3a) 2 ] (6a; Cu/3a = 1:2) not only in solution but also in vapor conditions. As 5a and 6a are ferromagnetic and paramagnetic, respectively, the transformation of 5a was monitored by magnetic susceptibility measurements in the solid state, and χT

show abstract

“…Current research work concerning the structural and magnetic properties of polynuclear transition metal compounds is aimed at understanding the structural and chemical features governing electronic exchange coupling through multi-atom bridging ligands [1][2][3] and possibilities for magnetic interaction between the two metal ions, leading to the design of molecular magnetic materials. 4 The pyridine-based bridging ligands have been actively utilized as construction units to obtain lots of supramolecular arrays and molecular magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Monomeric and Dimeric Copper(II) Complexes with Phenyl-N-[(pyridine-2-yl)methylene]methaneamide

Lee¹,

Sengottuvelan²,

Seo³

et al. 2008

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

The reaction of copper(II) chloride with phenyl-N-[(pyridine-2-yl)methylene]methaneamide (ppmma) leads to a new μ-chloro bridged dimeric [Cu(ppmma)Cl 2 ] 2 complex, whereas a reaction of copper(II) bromide with ppmma affords a monomeric Cu(ppmma)Br 2 complex . Both complexes have been characterized by X-ray crystallography and electronic absorption spectroscopy. The crystal structural analysis of [Cu(ppmma)Cl 2 ] 2 shows that the two Cu(II) atoms are bridged by two chloride ligands, forming a dimeric copper(II) complex and the copper ion has a distorted square-pyramidal geometry (τ = 0.2). The dimer units are held through a strong intermolecular π-π interactions between the nearest benzyl rings. On the other hand, Cu(ppmma)Br 2 displayed a distorted square planar geometry with two types of strong intermolecular π-π interaction. EPR spectrum of [Cu(ppmma)Cl 2 ] 2 in frozen glass at 77 K revealed an equilibrium between the mononuclear and binuclear species. The magnetic susceptibilities data of [Cu(ppmma)Cl 2 ] 2 and Cu(ppmma)Br 2 follow the Curie-Weiss law. No significant intermolecular magnetic interactions were examined in both complexes, and magnetic exchange interactions are discussed on the basis of the structural features.

show abstract

Molecular structure and intra- and intermolecular magnetic interactions in chloro-bridged copper(II) dimers

Cited by 94 publications

References 40 publications

Synthesis, Characterization and Antibacterial Studies on Copper(II) Binuclear Complexes with Substituted Piperidin-4-ones

Synthesis, Characterization and Antibacterial Studies on Copper(II) Binuclear Complexes with Substituted Piperidin-4-ones

Transformation of a Cu^II Thiazolo‐1,2,4‐triazine Derivative from a Metastable Coordination Network to a Monomer in Solution and Vapor Conditions

Structural and Magnetic Properties of Monomeric and Dimeric Copper(II) Complexes with Phenyl-N-[(pyridine-2-yl)methylene]methaneamide

Contact Info

Product

Resources

About

Molecular structure and intra- and intermolecular magnetic interactions in chloro-bridged copper(II) dimers

Cited by 94 publications

References 40 publications

Synthesis, Characterization and Antibacterial Studies on Copper(II) Binuclear Complexes with Substituted Piperidin-4-ones

Synthesis, Characterization and Antibacterial Studies on Copper(II) Binuclear Complexes with Substituted Piperidin-4-ones

Transformation of a CuII Thiazolo‐1,2,4‐triazine Derivative from a Metastable Coordination Network to a Monomer in Solution and Vapor Conditions

Structural and Magnetic Properties of Monomeric and Dimeric Copper(II) Complexes with Phenyl-N-[(pyridine-2-yl)methylene]methaneamide

Contact Info

Product

Resources

About

Transformation of a Cu^II Thiazolo‐1,2,4‐triazine Derivative from a Metastable Coordination Network to a Monomer in Solution and Vapor Conditions