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[Fe(H 2 O) 5 (NO)] 2+ , the “Brown‐Ring” Chromophore
Author(s) -
Monsch Georg,
Klüfers Peter
Publication year - 2019
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/anie.201902374
Subject(s) - chromophore , ring (chemistry) , crystallography , ion , salt (chemistry) , spin (aerodynamics) , chemistry , materials science , physics , photochemistry , organic chemistry , thermodynamics
Although the “brown‐ring” ion, [Fe(H 2 O) 5 (NO)] 2+ ( 1 ), has been a research target for more than a century, this poorly stable species had never been isolated. We now report on the synthesis of crystals of a salt of 1 which allowed us to tackle the unique bonding situation on an experimental basis. As a result of the bonding analysis, two stretched, spin‐polarised π‐interactions provide the Fe–NO binding—and challenge the concept of “oxidation state”.