78733-37-6Relevant academic research and scientific papers
The assembly of rotaxane-like dye/cyclodextrin/surface complexes on aluminium trihydroxide or goethite
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
, p. 2785 - 2793 (2006)
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 α-cyclodextrin. The Royal Society of Chemistry 2006.
Artificial metalloesterases constructed by site-directed attachment of oximinato metal centers to poly(ethylenimine) containing β-cyclodextrin
Suh, Junghun,Kwon, Won Jong
, p. 103 - 117 (1998)
In an effort to establish a methodology for construction of active sites of artificial enzymes, site-directed attachment of 2,6- diacetylpyridineketoxime (III) to poly(ethylenimine) (PEI) containing β- cyclodextrin (CD) was attempted. The site-directed functionalization exploited a t-butylphenyl ester (I) of a carboxylic acid containing a precursor of III. Anchoring of the t-butylphenyl group of I by the CD portion followed by transfer of III moiety to an amino group located in the vicinity of the CD moiety would lead to introduction of III in proximity to the CD moiety. By acylation in DMSO of CD-PEI with the phenyl ester (II), instead of the t-butylphenyl ester, III was introduced randomly to CD-PEI. In the presence of the Ni(II) or Zn(II) complex of the III-containing CD-PEI prepared by either the site-directed or the random functionalization method, ester hydrolysis of 4-(4'-acetoxy-phenylazo)-benzenesulfonate (IV) was considerably enhanced. Analysis of the kinetic data measured at various pHs revealed that k(cat) for the PEI derivative prepared by site-directed modification was three to six times greater than that by random modification. The results were taken to indicate that I transferred III to the vicinity of the CD moiety of CD-PEI, but that orientation of III and the CD cavity in the resulting PEI derivative was not very productive for deacylation of IV complexed by the CD cavity.
