The design, synthesis and photophysical properties of two novel 1,8-naphthalimide fluorescent pH sensors based on PET and ICT
摘要:
The changes in the photophysical properties of two novel yellow green emitting pH chemosensors namely a 1 8-naphthalimide dye and its condensed heterocyclic derivative as a function of pH were investigated in water/ethanol The 1 8-naphthalimide dye displayed on-off pH sensing properties owing to photoinduced electron transfer while its condensed heterocyclic derivative revealed off-on-off pH sensor activity derived from simultaneous photoinduced electron transfer and internal charge transfer In alkaline media the fluorescence of the 1 8-naphthailimide dye was quenched owing to photoinduced electron transfer being disabled in acidic media The pK(a) of the 1 8-naphthailimide dye was 549 which defines the dye as a highly efficient off on switch For the heterocyclic 1 8-naphthalimide derivative two fluorescence quenching processes at different pH were observed one with a pK(a) value of 608 and a second with a pK(a) value of 395 These results indicate that the heterocyclic derivative would be able to act as an efficient off on off fluorescent pH switch (C) 2010 Elsevier Ltd All rights reserved
The design, synthesis and photophysical properties of two novel 1,8-naphthalimide fluorescent pH sensors based on PET and ICT
作者:Nikolai I. Georgiev、Vladimir B. Bojinov、Peter S. Nikolov
DOI:10.1016/j.dyepig.2010.08.004
日期:2011.3
The changes in the photophysical properties of two novel yellow green emitting pH chemosensors namely a 1 8-naphthalimide dye and its condensed heterocyclic derivative as a function of pH were investigated in water/ethanol The 1 8-naphthalimide dye displayed on-off pH sensing properties owing to photoinduced electron transfer while its condensed heterocyclic derivative revealed off-on-off pH sensor activity derived from simultaneous photoinduced electron transfer and internal charge transfer In alkaline media the fluorescence of the 1 8-naphthailimide dye was quenched owing to photoinduced electron transfer being disabled in acidic media The pK(a) of the 1 8-naphthailimide dye was 549 which defines the dye as a highly efficient off on switch For the heterocyclic 1 8-naphthalimide derivative two fluorescence quenching processes at different pH were observed one with a pK(a) value of 608 and a second with a pK(a) value of 395 These results indicate that the heterocyclic derivative would be able to act as an efficient off on off fluorescent pH switch (C) 2010 Elsevier Ltd All rights reserved