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Journal ArticleDOI

Reactivity of copper(II) peptide complexes with bioligands (benzimidazole and creatinine)

TL;DR: The nature of the peptide seems to be a very important factor for the reactivity of copper(II) peptide complexes with bioligands as mentioned in this paper, and only four new ternary Cu(II)-complexes have been obtained.
About: This article is published in Polyhedron.The article was published on 2003-11-15. It has received 40 citations till now. The article focuses on the topics: Benzimidazole & Square pyramidal molecular geometry.
Citations
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Journal ArticleDOI
TL;DR: In low-molecular-weight ternary complexes some recognition patterns are repeatedly observed as mentioned in this paper, such as long bonds between metal ions and nucleobases, hydrogen bonds between the amino group of amino acids and a carbonyl group of the nucleobas and vice versa.

79 citations

Journal ArticleDOI
TL;DR: In this paper, five new mixed ligand coper(II) complexes have been synthesized and characterized by means of elemental analysis, FAB mass spectrometry, magnetic susceptibility, X-band EPR, electronic spectroscopy, IR and cyclic voltammetry.

66 citations

Journal ArticleDOI
TL;DR: In this paper, a review of guanidine copper compounds with an emphasis on structural characteristics and their application in bioinorganic chemistry and catalysis is presented. But the focus of this paper is on the use of the guanidines as neutral donor ligands in copper coordination.
Abstract: Abstract In this paper, guanidine copper compounds are reviewed with an emphasis on structural characteristics and their application in bioinorganic chemistry and catalysis. The literature survey includes the copper coordination chemistry of biological guanidine derivatives, peralkylated guanidines including bicyclic ones and of further nitrogen-rich guanidine-type systems such as azoimidazoles, triazolopyrimidines and triaminoguanidines. From a sporadic interest dating back to the 1960s, research on this ligand class and its use in copper coordination chemistry has gained new impetus since 2000. With the synthesis of examples with sophisticated substitution at the characteristic CN3 framework, complex problems can be addressed in several fields of chemistry. This paper analyses the different types of guanidines for their special donor properties and highlights the specific advantages of guanidines as neutral donor ligands in copper coordination chemistry where a great variety of coordination modes was found. These compounds offer the ability to distribute the formal positive charge of the metal throughout the guanidine unit and represent more than simple σ-donating ligands.

66 citations

Journal ArticleDOI
TL;DR: All the observations indicate that these complexes act as good possible models for superoxide dismutase, and spectral measurements of the homobinuclear complexes have shown an antiferromagnetic exchange interaction.

58 citations

Journal ArticleDOI
TL;DR: In this article, two new copper(II) complexes of the type [Cu(L)X2], where L = (E)-N-phenyl-2-[phenyl (pyridine-2-yl)methylene]hydrazinecarboxamide X = Cl/Br have been synthesized and characterized by elemental analyses, FAB (fast atomic bombardment) magnetic measurements, electronic absorption, conductivity measurements cyclic voltammetry (CV) and Electron paramagnetic resonance (epr) spectroscopy.

55 citations

References
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Book
01 Jan 1978
TL;DR: In this article, the normal modes of vibration are illustrated and corresponding vibrational frequencies are listed for each type, including diatomic, triatomic, fouratomic, five-atomic, six-atomic and seven-atomic types.
Abstract: Inorganic molecules (ions) and ligands are classified into diatomic, triatomic, four-atomic, five-atomic, six-atomic, and seven-atomic types, and their normal modes of vibration are illustrated and the corresponding vibrational frequencies are listed for each type. Molecules of other types are grouped into compounds of boron, carbon, silicon, nitrogen, phosphorus, and sulfur, and the structures and infrared (IR)/Raman spectra of select examples are shown for each group. Group frequency charts including band assignments are shown for phosphorus and sulfur compounds. Other group frequency charts include hydrogen stretching frequencies, halogen stretching frequencies, oxygen stretching and bending frequencies, inorganic ions, and metal complexes containing simple coordinating ligands. Keywords: inorganic compounds; coordination compounds; diatomic molecules (ligands); triatomic molecules (ligands); four-atomic molecules (ligands); five-atomic molecules (ligands); six-atomic molecules (ligands); seven-atomic molecules (ligands); boron compounds; carbon compounds; silicon compounds; nitrogen compounds; phosphorus compounds; sulfur compounds; group frequency charts

15,951 citations


"Reactivity of copper(II) peptide co..." refers background in this paper

  • ...Thus, a very strong and broad band is observed [1612 cm 1 for 1 and 1585 cm 1 for 2] which is assignable to m(C@O)+ m(C–N), and ma(COO) of the peptidic moiety [51] with contribution of the dN– H+ m(C–N) and m(C@C) skeletal in plane vibrations of benzene peaks of the benzimidazole ligand [50]....

    [...]

Journal ArticleDOI
TL;DR: In this article, a phase annealing method, related to the simulated-annealing approach in other optimization problems, is proposed and it is shown that it can result in an improvement of up to an order of magnitude in the chances of solving large structures at atomic resolution.
Abstract: A number of extensions to the multisolution approach to the crystallographic phase problem are discussed in which the negative quartet relations play an important role. A phase annealing method, related to the simulated annealing approach in other optimization problems, is proposed and it is shown that it can result in an improvement of up to an order of magnitude in the chances of solving large structures at atomic resolution. The ideas presented here are incorporated in the program system SHELX-90; the philosophical and mathematical background to the direct-methods part (SHELXS) of this system is described.

14,787 citations

Journal ArticleDOI
TL;DR: The demonstration that O2·- can reduce ferricytochrome c and tetranitromethane, and that superoxide dismutase, by competing for the superoxide radicals, can markedly inhibit these reactions, is demonstrated.

12,468 citations

Book
01 Jan 1994
TL;DR: An Overview of Bioinorganic Chemistry Principles of Coordination Chemistry Related to bioinorganic Research Properties of Biological Molecules and Physical Methods in Bioin organic Chemistry.
Abstract: An Overview of Bioinorganic Chemistry Principles of Coordination Chemistry Related to Bioinorganic Research Properties of Biological Molecules Physical Methods in Bioinorganic Chemistry Choice and Assembly of Metal Ions in Biology Control and Utilization of Metal Ion Concentrations in Cells Metal Ion Folding and Crosslinking of Biomolecules Metal Ion Binding to Biomolecule Active Centres Electron Transfer Proteins Substrate Binding and Activation Atom and Group Transfer Chemistry Protein Turning of Metal Properties to Achieve Specific Functions Frontiers of Bioinorganic Chemistry

1,578 citations


"Reactivity of copper(II) peptide co..." refers background in this paper

  • ...O 2 anion as well as fast interchange of axial co-ordinated solvent molecules [31,32,56]....

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Trending Questions (1)
How long does it take to see results from copper peptide?

The nature of the peptide seems to be a very important factor for the reactivity of copper(II) peptide complexes with bioligands.