A fluorescent bischromophoric dyad combining anthracene and naphthalic anhydride units has been synthesized and characterized. The dyad shows a FRET mediated emission signal at â¼535 nm when excited at λex. = 380/360 nm, with efficient energy transfer efficiency (ET = 93%) and quantum yield (Φ = 0.155). Upon interaction with Fâ and Hg2+ ions selectively, a diminished (switched-Off) FRET signal is observed and the naked-eye sensitive color of the solution changed to dark red with enhanced emission corresponding to an anthracene moiety (switched-On). Job's plot analysis revealed a 1â:â1 stoichiometry between dyad and Fâ/AcOâ and Hg2+ ions. The output fluorescence signals exhibited by dyad on chemical inputs of Fâ, AcOâ and Hg2+ ions mimicked OR, XNOR and INHIBIT logic functions. A 1H NMR titration experiment suggested deprotonation of âNH proton and âY-type or tweezer-likeâ H-bonding interaction in the presence of Fâ and AcOâ, respectively, involving âNH, âCHNâ and anthracene ring protons.
合成并表征了一种结合了
蒽和
萘酸酐单元的荧光双色性二元体。该二元体在波长为380/360 nm激发时,显示出在约535 nm的FRET介导的发射信号,能量转移效率高(ET = 93%)且量子产率为(Φ = 0.155)。当与F⁻和Hg²⁺离子选择性相互作用时,观察到FRET信号减弱(开关关闭),溶液的肉眼敏感颜色变化为深红色,伴随着相应于
蒽单元的增强发射(开关开启)。Job图分析显示二元体与F⁻/AcO⁻和Hg²⁺离子之间存在1:1的
化学计量比。在
化学输入F⁻、AcO⁻和Hg²⁺离子时,二元体的输出荧光信号模拟了或门(OR)、XNOR门和抑制门(INHI
BIT)逻辑函数。1H NMR滴定实验表明,在F⁻和AcO⁻存在下,分别发生了-NH质子的去质子化和“Y型或钳子状”氢键相互作用,涉及-NH、-CHN-和
蒽环质子。