The assembly of rotaxane-like dye/cyclodextrin/surface complexes on aluminium trihydroxide or goethite |
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| Authors: | Cooper Rachel J Camp Philip J Gordon Ross J Henderson David K Henry Dorothy C R McNab Hamish De Silva Sonali S Tackley Daniel Tasker Peter A Wight Paul |
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| Institution: | School of Chemistry, University of Edinburgh, Joseph Black Building, Kings Buildings, West Mains Road, Edinburgh, UKEH9 3JJ. |
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| Abstract: | Simple azo-dyes carrying phosphonic acid and arsonic acid substituents such as 4-(4-hydroxyphenyl azo)phenylphosphonic acid (5) and 4-(4-hydroxyphenylazo)phenylarsonic acid (6) bind more strongly to high surface area oxides such as aluminium trihydroxide and goethite than their carboxylic and sulfonic acid analogues and the phosphonate-functionalized dyes have been shown to have greater humidity fastness when printed onto commercial alumina-coated papers. Adsorption isotherm measurements provide evidence for the formation of ternary dye/cyclodextrin/surface complexes. Dyes which form such ternary complexes show higher light fastness when printed onto alumina coated papers in an ink formulation containing alpha-cyclodextrin. |
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