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Mechanism of Reduction of the Nitrite Ion by Cu I Complexes
Author(s) -
Burg Ariela,
Lozinsky Evgenia,
Cohen Haim,
Meyerstein Dan
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400255
Subject(s) - chemistry , redox , copper , nitrite , reaction mechanism , nitrite reductase , inorganic chemistry , ion , nitrogen , stereochemistry , nitrate , organic chemistry , catalysis
The reaction of Cu + aq with NO 2 − was studied. The results are consistent with the mechanism: Cu + aq + NO 2 − → ← (Cu + NO 2 − ), K = 140 ± 30 M −1 ; (Cu + NO 2 − ) + H + → Cu 2+ + NO + OH − , k = 4.6 × 10 5 M −1 s −1 . It is proposed that the copper is bound to the nitrogen in the transient complex (Cu + NO 2 − ). In addition, the reaction was studied with (Cu I L i ) + complexes. The results show that the ligands reduce the value of K and that their effect on k depends on the redox potential of the (Cu II/I L i ) couple. This reaction is the simplest model for the CuNIR (NIR = Nitric reductase) enzymes. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)