Journal
DYES AND PIGMENTS
Volume 130, Issue -, Pages 233-244Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.03.024
Keywords
Tetrahydrodibenzo[a,i]phenanthridine; Chromophores; Fluorescence; Acidochromism
Funding
- CSIR [09/844(0018)2013-EMR-1]
- DST India [SERB/F/4232/2013-15]
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A series of luminescent 5-aryl-tetrahydrodibenzo[a,i]phenanthridines was developed through modified synthetic protocol using SnCl2-acetic acid as a catalyst. The synthesis was consistent with various functionalities and significantly improves the yields. These derivatives exhibit large molar absorption coefficients and higher Stokes shift values in the range 9739-2628 cm(-1). The donor and acceptor groups significantly induced the charge transfer character leading to widespread emission properties in the range of 390-531 nm with moderate quantum yields. The protonation and quaternization studies of these derivatives revealed the formation of a new red shifted absorption band followed by hyperchromic effect in emission, which could be used as an acidochromic sensor. (C) 2016 Elsevier Ltd. All rights reserved.
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