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Synthesis, X‐ray Structure and Reactivity of a Sterically Protected Azobisphenol Ligand: On the Quest for New Multifunctional Active Ligands
Author(s) -
Evangelio Emi,
SaizPoseu Javier,
Maspoch Daniel,
Wurst Klaus,
Busque Felix,
RuizMolina Daniel
Publication year - 2008
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.200701339
Subject(s) - chemistry , steric effects , deprotonation , protonation , reactivity (psychology) , tautomer , ligand (biochemistry) , valence (chemistry) , stereochemistry , cobalt , crystallography , ion , inorganic chemistry , organic chemistry , medicine , biochemistry , alternative medicine , receptor , pathology
Different synthetic routes have been explored for the synthesis of the sterically protected 2,2′‐dihydroxy‐4,3,4,3′‐tetra‐ tert ‐butylazobenzene ligand ( 2 ), which is an excellent candidate for the development of valence tautomeric complexes. As expected, such a ligand exhibits good reactivity with transition‐metal ions, as shown by the synthesis and characterization of the new cobalt complex [Co( 2 2– )(H 2 O) 3 ]Cl · 2.5EtOH · H 2 O ( 8 ). This fact together with the reversible deprotonation/protonation of the phenol groups has been used to create a chromophoric array of three states with significantly different colours, which can interconvert reversibly between them. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)