1146398-27-7Relevant articles and documents
Photoreversible Zn2+ ion transportation across an interface using ion-chelating substituted photochromic 3,3′-indolospirobenzopyrans: Steric and electronic controlling effects
Roxburgh, Craig J.,Sammes, Peter G.,Abdullah, Ayse
, p. 4951 - 4960 (2008)
The photoreversible transportation of Zn2+ ions across an interface using photochromic substituted-spirobenzopyrans has been demonstrated. The inclusion of strategically placed sterically influencing 3′-methyl-3b and 3-spirocyclohexyl-3c groupings is investigated and compared to the unsubstituted analogue 3a. Significant control over the spiropyran ringopening? closing reaction, and hence Zn2+ ion transportation has been realised. Additionally, the spiropyran ring-opening? closing reactions of two skeletally identical spirobenzo pyrans 4 and 5, but possessing "electronically-modifying" 5-trifluoromethyl-substitutents have been studied by 1H NMR spectroscopy: this has enabled us to realise the additional biasing, on the ring-opening?closing process, excerpted on these systems through both selectively placed, inductively controlling functional-group substitution and/or, simultaneously, sterically influencing group substitution. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
