Electrochemistry of Cu(I) bipyridyl complexes with alkene, alkyne, and nitrile ligands. Implications for plant hormone action of ethylene.
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.
Kovacic
P
P
Department of Chemistry, University of Wisconsin-Milwaukee, Milwaukee 53201.
Kiser
P F
PF
Reger
D L
DL
Huff
M F
MF
Feinberg
B A
BA
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*
D000475:Alkenes; D000480:Alkynes; D005030:Ethylenes; D008024:Ligands; D009570:Nitriles; D010937:Plant Growth Regulators; D011725:Pyridines; D003300:Copper; C036216:ethylene