A novel rhodamine-3,4-dihydro-2H-1,3-benzoxazine conjugate as a highly sensitive and selective chemosensor for Fe3+ ions with cytoplasmic cell imaging possibilities

作者：Molla Habib Ali; Bhowmick Rahul; Katarkar Atul; Chaudhuri Keya; Gangopadhyay Sumana; Ali Mahammad

来源：Analytical Methods, 2015, 7(12): 5149-5156.

DOI：10.1039/c5ay00754b

A novel, highly sensitive and selective fluorescent chemosensor 'rhodamine-3,4-dihydro-2H-1,3-benzoxazine' [RH-BZN (1)] has been synthesized and characterized by single crystal X-ray diffraction and other physicochemical techniques. In 3 : 7 water : MeCN (v/v) at pH 7.2 (10 mM HEPES buffer, mu = 0.05 M LiCl) it selectively recognizes Fe3+ through 1 : 1 complex formation resulting in a 240-fold fluorescence enhancement and a binding constant (K-f) of 1.50 x 104 M-1. The otherwise non-fluorescent spirolactam form of the probe results in dual changes in absorbance and fluorescence arising out of opening of the spirolactam ring through coordination to Fe3+ ions. This probe could suitably be employed for cytoplasmic intracellular imaging of Fe3+ without notable cytotoxicity. The reversible binding of RH-BZN to Fe3+ was confirmed by reacting with tetra-n-butylammonium fluoride both in extra-and intra-cellular conditions.

• 出版日期2015