Author
Robert D. Bereman
Other affiliations: University at Buffalo
Bio: Robert D. Bereman is an academic researcher from University of Kentucky. The author has contributed to research in topics: Coordination geometry & Copper. The author has an hindex of 1, co-authored 1 publications receiving 41 citations. Previous affiliations of Robert D. Bereman include University at Buffalo.
Topics: Coordination geometry, Copper, Coordination complex
Papers
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TL;DR: In this paper, electron spin resonance and optical solution studies of copper(II) complexes of l -sparteine confirm the rare pseudotetrahedral coordination geometry of copper in solution.
41 citations
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TL;DR: The mechanisms of the metal toxicity depending largely on the growth stage of treated plants are presented in this review.
Abstract: Copper (Cu) is a heavy metal which in recent studies has been attributed an increasing role in metabolic processes of plant cells. It is an indispensable component of oxidative enzymes or of particular structural components of cells. At elevated concentrations, Cu can act strongly on chromatin, the photosynthetic apparatus, growth, and senescence processes. The mechanisms of the metal toxicity depending largely on the growth stage of treated plants are presented in this review.
358 citations
TL;DR: In this paper, the interaction of the following nitrogen-sulphur donor ligands with copper has been investigated: 2-(3,3-dimethyl-2-thiabutyl)benzimidazole (L1), 2-methylthio-2-,quinoline (L2), 2ethylthioethylamine (L3), 2-(2-ethylthiosulfur)pyridine (L4), 2
49 citations
TL;DR: In this article, two Schiff bases, 1-acetylferrocene thiosemicarbazone (HL1) and 1-1′-diacetyl-ferrocene dithiosembrasone (H2L2) and their copper(II) complexes were prepared and characterized by elemental analysis, magnetic susceptibility, conductivity, and spectral (IR, UV-Vis, ESR) measurements.
Abstract: Two Schiff bases, 1-acetylferrocene thiosemicarbazone (HL1) and 1,1′-diacetyl-ferrocene dithiosemicarbazone (H2L2) and their copper(II) complexes were prepared and characterized by elemental analysis, magnetic susceptibility, conductivity, and spectral (IR, UV–Vis, ESR) measurements The IR spectra showed that HL1 acts as neutral or monobasic bidentate ligand, coordinating to copper(II) through either thiono- or thiolo-sulphur and azomethine-N atoms, whereas H2L2 is a neutral or dibasic mononucleating or binucleating quadridentate ligand coordinating through the same atoms. Other spectral measurements indicate that complexes [(L1)2Cu], [(L2)Cu] and [(HL1)2Cu]X2, X = Cl, Br or ClO4 have square-planar geometry around copper(II) while [(HL1)CuX2] and [(H2L2)Cu2X4], X = Cl or Br, have distorted tetrahedral geometry. The biological activity studies of the complexes and the free ligands towards two gram positive and two gram negative bacteria and one fungal species have been studied and the potential is related ...
36 citations
TL;DR: In this paper, a new μ-η2: η2-peroxo dicopper(II) complex was synthesized by oxygenation of [CuI(αSp)(CH3CN)]SbF6 with Bz- at −80 °C in acetone.
Abstract: A new μ-η2:η2-peroxo dicopper(II) complex, [CuII2(αSp)2(μ-η2:η2-O2)(Bz-)]SbF6 (αSp = α-isosparteine, Bz- = benzoate) was synthesized by oxygenation of [CuI(αSp)(CH3CN)]SbF6 with Bz- at −80 °C in acetone. X-ray crystallographic analysis of the dark blue crystal revealed that the “bridged butterfly core” is formed by bridging Bz- bound in the axial position. The weaker σ-electron donation of αSp causes the axial coordination of Bz- to stabilize the butterfly-type μ-η2:η2-peroxo dicopper(II) species as an intermediate of stepwise O2-activation to bis(μ-oxo) dicopper(III) species.
33 citations