Abstract
The single crystal structure of two synthetic flavylium salts possessing a catechol unit in position 7 and 8, (7,8-dihydroxy-4-methylflavylium,7,8- dihydroxyflavylium) is shown. The formation of aluminium complexes with these ligands as well as with the natural anthocyanin, cyanin, and the deoxyanthocyanidin, luteolinidin, both bearing a cathecol unit in position 3′ and 4′, is described. Complexation with Al3+ stabilizes the blue ionised quinoidal base avoiding its degradation by reaction with oxygen. The simple model developed to describe the complexation, indicates a metal ligand stoichiometry of 1:1. The complexation constants lie between 5.5 × 106 < Kcp < 1.3 × 109.
Original language | English |
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Pages (from-to) | 51-61 |
Number of pages | 11 |
Journal | Inorganica Chimica Acta |
Volume | 356 |
DOIs | |
Publication status | Published - 3 Dec 2003 |
Keywords
- Al
- Anthocyanins
- Blue-purple colour
- Cathecol
- Synthetic flavylium