title: Electrochemistry of Cu(I) bipyridyl complexes with alkene, alkyne, and nitrile ligands. Implications for plant hormone action of ethylene.
abstract: The redox behavior was evaluated for several (BIPY)Cu(I) complexes (BIPY = 2,2'-bipyridyl) with unsaturated ligands by means of cyclic voltammetry in CH2Cl2 at reduced temperatures (-78 degrees, -23 degrees, 0 degree C). The complexes studied are [Cu(I)(BIPY)(C2H4)]PF6, [Cu(I)(BIPY)(3-hexyne)] PF6, [Cu(I)(BIPY)(DEAD)]PF6, ([Cu(I)(BIPY)]2 DEAD)[PF6]2 (DEAD = diethyl acetylene dicarboxylate) and [Cu(I)(BIPY)(CH3CN)]PF6. The oxidations are quasi-reversible at -78 degrees C for scan rates of 20 to 200 mV/sec. The reductions were irreversible on the CV time scale. Evidence is presented in support of a role for an electron transfer mechanism in the case of the plant hormone ethylene. Related literature data are also discussed.
authors.affiliation: Department of Chemistry, University of Wisconsin-Milwaukee, Milwaukee 53201.
authors.forename: P
authors.initials: P
authors.lastname: Kovacic
authors.forename: P F
authors.initials: PF
authors.lastname: Kiser
authors.forename: D L
authors.initials: DL
authors.lastname: Reger
authors.forename: M F
authors.initials: MF
authors.lastname: Huff
authors.forename: B A
authors.initials: BA
authors.lastname: Feinberg
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D000480:Alkynes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry; D005030:Ethylenes / Q000737:chemistry*; D008024:Ligands; D009570:Nitriles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010937:Plant Growth Regulators / Q000737:chemistry* / Q000494:pharmacology; D018521:Plant Physiological Phenomena; D011725:Pyridines / Q000737:chemistry*
chemical_list: D000475:Alkenes; D000480:Alkynes; D005030:Ethylenes; D008024:Ligands; D009570:Nitriles; D010937:Plant Growth Regulators; D011725:Pyridines; D003300:Copper; C036216:ethylene