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The Reactions of Elemental Iron with Dipicolinic Acid (H 2 dipic) and Quinaldic Acid (Hquin) – X‐ray Crystal Structures of [C 5 H 5 NH][Fe(Dipic)(Hdipic)(C 5 H 5 N) 2 ]·3C 5 H 5 N, [Fe 2 (µ‐O)(Dipic) 2 (C 5 H 5 N) 4 ]·2C 5 H 5 N·2H 2 O and trans ‐[Fe(Quin) 2 (MeOH) 2 ]
Author(s) -
Jain Sneh L.,
Slawin Alexandra M. Z.,
Derek Woollins J.,
Bhattacharyya Pravat
Publication year - 2005
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.200400728
Subject(s) - chemistry , dipicolinic acid , picolinic acid , pyridine , carboxylate , reactivity (psychology) , ligand (biochemistry) , medicinal chemistry , inorganic chemistry , methanol , crystal structure , metal , stereochemistry , crystallography , organic chemistry , medicine , biochemistry , botany , alternative medicine , receptor , spore , pathology , biology
Iron powder reacts with dipicolinic acid (H 2 dipic) in pyridine at 110 °C to give the heptacoordinate iron( II ) complex [C 5 H 5 NH][Fe(dipic)(Hdipic)(C 5 H 5 N) 2 ]; the (Hdipic) – ligand binds to the metal centre solely through the oxygen atoms of one carboxylate group, the first example of this coordination mode at iron. Upon dissolution in pyridine under aerobic conditions this complex transforms into the oxo‐bridged diiron( III ) species [Fe 2 (μ‐O)(dipic) 2 (C 5 H 5 N) 4 ], which possesses a linear Fe–O–Fe axis. Quinaldic acid (Hquin) reacts withiron powder in pyridine at 110 °C to give [Fe(quin) 2 (C 5 H 5 N) 2 ],analogous to the corresponding reactivity of picolinic acid. This complex is converted into trans ‐[Fe(quin) 2 (MeOH) 2 ] or [Fe 2 (μ‐O)(quin) 4 (dmf) 2 ] in methanol or DMF respectively. The formation of an iron( II ) complex in the reaction with methanol differs markedly from the picolinate system. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)