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(22-)(H 2O)3]Cl· 2.5EtOH·H2O (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, 2008.
|Journal||European Journal of Inorganic Chemistry|
|Publication status||Published - 1 Jan 2008|
- Acid-base behaviour
- Azobisphenol ligand
- Multifunctional ligands
- Valence tautomerism