二氰基亚甲基-四氢吡喃-苯并噻二唑的多功能逻辑门应用(英文)

Multifunctional Molecular Logic Gates Based on Dicyanomethylene-4H-pyran-Benzothiadiazole Conjugates

合成了基于二氰基亚甲基-四氢吡喃和苯并噻二唑的新型荧光化合物,并研究了该化合物通过改变二价铜离子和氟离子/溴离子滴加顺序对应的分子荧光现象。研究发现先加入二价铜离子导致该化合物的最大发射波长"蓝移",继续滴加氟离子导致荧光淬灭,若继续滴加的是溴离子则荧光不变;反之先加入氟离子,该化合物荧光强度微弱降低,继续滴加铜离子对荧光强度影响不大,若滴加溴离子,该化合物荧光不变,继续滴加铜离子,最大发射波长强度降低,并且在485nm处出现新的荧光;这些荧光变化的机制也得到研究与证实。分子逻辑门是在分子水平上的逻辑操作来描述逻辑门,输入和输出信号。通过改变离子性质(加入氟离子或溴离子)、滴加顺序、激发波长获得不同的荧光发射波长和荧光强度,模拟了EnYES、EnNOT、EnIMP、EnINH、EnNAND逻辑门,1∶2信号分离器和键盘锁。

Novel fluorescent compounds based on dicyanomethylene-4H-pyran and benzothiadia-zole scaffolds,responding to combinations of Cu2＋,F-and/or Br-in a sequence dependent mannerwere synthesized and their recognition properties were investigated. Addition of Cu2＋immediately re-sulted in the ＂blue shift＂,introduction of Br-after Cu2＋has no detectable influence compared to Cu2＋ion alone,whereas F–leads to complete quenching of fluorescence;In contrast,addition of F-beforeCu2＋induced only a slight reduction of fluorescence intensity at ca. 608 nm,while addition of Cu2＋af-ter Br–leads to partial quenching at 608 nm with concomitant partial appearance of fluorescenceemission around 485 nm. The mechanism was studied and confirmed. A logic gate is an idealized orphysical device implementing a Boolean function,that is,it performs a logical operation on one ormore logical inputs,and produces a single logical output. These structurally simple molecules canmimic the functionnalities of various complex logic gate such as EnYES,EnNOT,EnIMP,EnINH,EnNAND arrays by selection of inputs（nature of ions,sequence of additions and excitation wave-length）and outputs（fluorescence reading wavelength and threshold）,1∶2 demultiplexer and key-board.