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Oxidation‐State and Coordination‐Site Specificity Influencing Dimensional Extension and Properties of Two Iron Complexes with Similar Helical Chains
Author(s) -
Xu Ying,
Han Lei,
Lin ZhengZhong,
Liu CaiPing,
Yuan DaQiang,
Zhou YouFu,
Hong MaoChun
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.200400254
Subject(s) - chemistry , crystallography , antiferromagnetism , valence (chemistry) , thermogravimetric analysis , metal , crystal structure , dimethylformamide , ferromagnetism , oxidation state , thermal stability , coordination complex , stereochemistry , organic chemistry , physics , quantum mechanics , solvent , condensed matter physics
Two new iron coordination frameworks, {[NH 2 (CH 3 ) 2 ] 2 Fe II (pydc) 2 } n ( 1 ) and {[NH 2 (CH 3 ) 2 ]Fe III (pydc) 2 } n ( 2 ) (pydc = 2,5‐pyridinedicarboxylate), have been synthesized through the reaction of FeCl 3 with H 2 pydc in dimethylformamide (DMF). 1 crystallizes in an achiral space group C 2/ c , while 2 crystallizes in a chiral space group P 4 3 2 1 2. Both crystal structures consist of 2 1 helices with similar units: [Fe II (pydc) 2 ] 2− and [Fe III (pydc) 2 ] − , respectively. The iron oxidation states have been confirmed by means of ESR spectra and bond valence calculations. Quantum chemistry calculations and thermogravimetric analysis have demonstrated their energy and thermal stability. Magnetic studies have revealed that 1 and 2 show weak antiferromagnetic and ferromagnetic interactions between the metal centers, respectively. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)