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An Exceedingly Stable Diiron( II , III ) Complex Ion [(tz){Fe(CN) 5 } 2 ] 5− with Comproportionation Constants between 10 8 (in H 2 O) and 10 19 (in CH 3 CN)
Author(s) -
Glöckle Markus,
Kaim Wolfgang
Publication year - 1999
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19991018)38:20<3072::aid-anie3072>3.0.co;2-2
Subject(s) - comproportionation , delocalized electron , acetonitrile , ion , chemistry , endothermic process , photochemistry , organic chemistry , electrode , electrochemistry , adsorption
A record equilibrium constant of K c = 10 19 was found for the comproportionation of the diiron( II , III ) complex 1 in acetonitrile. In water the K c value is strongly diminished (10 7.9 ), but still exceeds that of the Creutz–Taube ion. Intervalence charge transfer bands occur at 2520 nm (in CH 3 CN) and 2250 nm (in D 2 O), and all evidence points to a strongly coupled system with delocalized valences.