Structure and Spectroscopy of Copper−Dioxygen Complexes

Reactivity of Dioxygen−Copper Systems

Ethylene influences a number of developmental processes and responses to stress in higher plants. The molecular basis for the action of ethylene was investigated in mutants of Arabidopsis thaliana that have altered responses to ethylene. One mutant line, which has a dominant mutation at a locus designated etr, lacks a number of responses to ethylene that are present in the wild-type plant. These include inhibition of cell elongation, promotion of seed germination, enhancement of peroxidase activity, acceleration of leaf senescence, and feedback suppression of ethylene synthesis by ethylene. These diverse responses, which occur in different tissues of Arabidopsis, appear to share some common element in their transduction pathways—for example, a single receptor for ethylene. Results of ethylene binding experiments in vivo indicate that this receptor may be affected by the etr mutation.

https://science.sciencemag.org/content/sci/241/4869/1086.full.pdf

Insensitivity to Ethylene Conferred by a Dominant Mutation in Arabidopsis thaliana

The coordination chemistry of pyrazole-derived ligands

The three-dimensional structure of plastocyanin, a ‘blue’ or ‘Type 1’ copper-protein, has been determined at a resolution of 2.7 A. The copper atom has a highly distorted tetrahedral coordination geometry. It is coordinated by a cysteine thiol group, a methionine thioether group, and two histidine imidazole groups.

X-ray crystal structure analysis of plastocyanin at 2.7 Å resolution

Co(HB[t-butyl-3 pyrazolyl-1] 3 )(NCS) et Co(HB[phenyl-3 pyrazolyl-1] 3 )(NCS)(THF) cristallisent dans le systeme monoclinique avec le groupe d'espace P2 1 /n. Affinement des structures jusqu'a 0,042 et 0,043 respectivement. La coordination autour de Co(II) dans le premier complexe est tetraedrique. Dans le second complexe, elle est bipyramidale rhomboedrique

Novel polypyrazolylborate ligands: coordination control through 3-substituents of the pyrazole ring

The synthesis, structures, and coordination chemistry of a series of polypyrazolylborate ligands, [H n B(3-isopropylpyrazol-1-yl) 4−n ] − and [HB(3-isopropyl-4-bromopyrazol-1-yl) 3 ] − , are presented. These ligands are made by the reaction of tetrahydroborate ion with the appropriate pyrazole. A series of metal complexes was prepared and characterized by analytical and spectroscopic data. In addition, four complexes were characterized by means of X-ray diffraction techniques. The results presented here indicated that these ligands have properties that are unique and transitional from those of the previously reported, relatively unhindered ligands such as [H n B(pyrazolyl-1-yl) 4−n ] − to the sterically bulky ligands [H n B(3-R-pyrazol-1-yl) 4−n ], where R=tert-butyl and phenyl groups

Steric effects in polypyrazolylborate ligands. Poly(3-isopropylpyrazolyl)borates: ligands of intermediate steric requirements

CuI und CuCl reagieren mit den Monoolefinen in Methylen- Chlorid zu Addukten, die bei langsamer Zugabe der entsprechenden K-pyrazolylborate (andernfalls bilden sich Cu(I)-polypyrazolylborat-Dimere) die Komplexe (I) und (II ) liefern.

Copper(I)-olefin complexes. Support for the proposed role of copper in the ethylene effect in plants

Preparation et etude des complexes [(Cu(NH(py) 2 )(X)] Y(X=C 2 H 4 et C 3 H 6 , Y=ClO 4 ; X=C 2 H 2 , Y=BF 4 et [Cu(NH(py) 2 )(CO)ClO 4 ]

Copper(I) complexes with unsaturated small molecules. Preparation and structural characterization of copper(I)−di-2-pyridylamine complexes with olefins, acetylene, and carbon monoxide

Orbital symmetries and magnetic interaction between copper(II) ions and the o-semiquinone radical. Magnetic studies of (di-2-pyridylamine)(3,5-di-tert-butyl-o-semiquinonato)copper(II) perchlorate and bis(bis(3,5-di-tert-butyl-o-semiquinonato)copper(II))

Jeffery S. Thompson

Papers

Novel polypyrazolylborate ligands: coordination control through 3-substituents of the pyrazole ring

Steric effects in polypyrazolylborate ligands. Poly(3-isopropylpyrazolyl)borates: ligands of intermediate steric requirements

Copper(I)-olefin complexes. Support for the proposed role of copper in the ethylene effect in plants

Copper(I) complexes with unsaturated small molecules. Preparation and structural characterization of copper(I)−di-2-pyridylamine complexes with olefins, acetylene, and carbon monoxide

Orbital symmetries and magnetic interaction between copper(II) ions and the o-semiquinone radical. Magnetic studies of (di-2-pyridylamine)(3,5-di-tert-butyl-o-semiquinonato)copper(II) perchlorate and bis(bis(3,5-di-tert-butyl-o-semiquinonato)copper(II))