153387-53-2Relevant articles and documents
Design, synthesis and photoswitching of broad-spectrum fluorescent hexaarylbiimidazoles
Gong, Wen-Liang,Xiong, Zu-Jing,Li, Chong,Zhu, Ming-Qiang
, p. 64371 - 64378 (2014)
A series of novel hexaarylbiimidazole (HABI)-containing fluorophores with broad-spectrum emissions ranging from blue, green and red emissions, have been designed and synthesized. Their photochromism and fluorescence switching properties are investigated by UV-Vis absorption and fluorescence spectra in solutions and PMMA films. By connecting carbazole (Cz), naphthalimide (NI) and perylene-mono-imide (PMI) to HABI with a spacer, three molecular photoswitches with broad-spectrum fluorescence varying from deep blue (Cz-O-HABI, λem = 390 nm, ΦF = 0.27), green (NI-O-HABI, λem = 490 nm, ΦF = 0.25) to far red (PMI-O-HABI, λem = 650 nm, ΦF = 0.25) have been obtained. The "ON"/"OFF" ratios are calculated to be about 8.9, 8.0 and 3.7 (calculated from FL spectra) for Cz-O-HABI, NI-O-HABI and PMI-O-HABI, respectively. Such a series of photoswitchable fluorophores constitute prototypes of a photochromic molecular library in which fluorescence resonance energy transfer can be reversibly modulated by an external stimulus, namely, UV light.
