Nitrophenylfuran-benzimidazole-based reversible alkaline fluorescence switch accurately controlled by pH》.pdfVIP

Sensors and Actuators B 219 (2015) 38–42 Contents lists available at ScienceDirect Sensors and Actuators B: Chemical j o u r n a l h o m ep a g e: w w w. elsev /locate/snb Nitrophenylfuran-benzimidazole-based reversible alkaline fluorescence switch accurately controlled by pH Xin Zhu, Qi Lin ∗ , You-Ming Zhang, Tai-Bao Wei ∗ Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, PR China a r t i c l e i n f o a b s t r a c t Article history: Two colorimetric and fluorescent pH chemosensors L4 and L5 bearing benzimidazole moiety as pH Received 26 December 2014 sensing site and nitrophenylfuran moiety as signal group were designed and synthesized. L4 and L5 Received in revised form 27 April 2015 showed well reversible pH response for a specific pH change in narrow pH range (at pH ranged from Accepted 4 May 2015 − − − − − 11.0 to 12.0) through obvious fluorescent color changes. Common anions (such as F , Cl , Br , I , AcO , Available online 16 May 2015 H2 PO4 − , HSO4 − , ClO4 − , CN− ) and cations (such as Fe3+ , Hg2+ , Ag+ , Ca2+ , Cu2+ , Zn2+ , Pb2+ , Cd2+ , Ni2+ , Co2+ , Cr3+ , Mg2+ ) did not