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Divergent Coordination Chemistry: Parallel Synthesis of [2×2] Iron(II) Grid‐Complex Tauto‐Conformers
Author(s) -
Schäfer Bernhard,
Greisch JeanFrançois,
Faus Isabelle,
Bodenstein Tilmann,
Šalitroš Ivan,
Fuhr Olaf,
Fink Karin,
Schünemann Volker,
Kappes Manfred M.,
Ruben Mario
Publication year - 2016
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.201603916
Subject(s) - tautomer , coordination complex , spin crossover , chemistry , ligand (biochemistry) , crystallography , conformational isomerism , spin states , ion , coordination number , oxidation state , metal , molecule , computational chemistry , stereochemistry , inorganic chemistry , organic chemistry , biochemistry , receptor
The coordination of iron(II) ions by a homoditopic ligand L with two tridentate chelates leads to the tautomerism‐driven emergence of complexity, with isomeric tetramers and trimers as the coordination products. The structures of the two dominant [Fe II 4 L 4 ] 8+ complexes were determined by X‐ray diffraction, and the distinctness of the products was confirmed by ion‐mobility mass spectrometry. Moreover, these two isomers display contrasting magnetic properties (Fe II spin crossover vs. a blocked Fe II high‐spin state). These results demonstrate how the coordination of a metal ion to a ligand that can undergo tautomerization can increase, at a higher hierarchical level, complexity, here expressed by the formation of isomeric molecular assemblies with distinct physical properties. Such results are of importance for improving our understanding of the emergence of complexity in chemistry and biology.