TY - JOUR
T1 - Novel fluorescent pH sensor based on coumarin with piperazine and imidazole substituents
AU - Saleh, Na'il
AU - Al-Soud, Yaseen A.
AU - Nau, Werner M.
N1 - Funding Information:
N. Saleh thanks Yarmouk University for their financial support (grant no. 2007/14). The financial support from the DAAD exchange programme (grant number A/06/11962) and the DFG (grant number NA 686/2-1) are also gratefully acknowledged.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - A new coumarin derivative containing piperazine and imidazole moieties is reported as a fluorophore for hydrogen ions sensing. The fluorescence enhancement of the studied sensor with an increase in hydrogen ions concentration is based on the hindering of photoinduced electron transfer from the piperazinyl amine and the imidazolyl amine to the coumarin fluorophore by protonation. The presented sensor has a novel design of fluorophore-spacer-receptor(1)-receptor(2) format, which is proposed to sense two ranges of pH (from 2.5 to 5.5) and (from 10 to 12) instead of sensing one pH range. A model compound, in which the piperazinyl ring is absent, was synthesized as well to confirm the novel pH sensing of the proposed sensor.
AB - A new coumarin derivative containing piperazine and imidazole moieties is reported as a fluorophore for hydrogen ions sensing. The fluorescence enhancement of the studied sensor with an increase in hydrogen ions concentration is based on the hindering of photoinduced electron transfer from the piperazinyl amine and the imidazolyl amine to the coumarin fluorophore by protonation. The presented sensor has a novel design of fluorophore-spacer-receptor(1)-receptor(2) format, which is proposed to sense two ranges of pH (from 2.5 to 5.5) and (from 10 to 12) instead of sensing one pH range. A model compound, in which the piperazinyl ring is absent, was synthesized as well to confirm the novel pH sensing of the proposed sensor.
KW - Coumarin
KW - Fluorescent multiple pH sensor
KW - Imidazole
KW - Photoinduced electron transfer (PET)
KW - Piperazine
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U2 - 10.1016/j.saa.2008.02.004
DO - 10.1016/j.saa.2008.02.004
M3 - Article
C2 - 18343715
AN - SCOPUS:53849109581
SN - 1386-1425
VL - 71
SP - 818
EP - 822
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
IS - 3
ER -