文献类型：期刊文献

英文题名：Intramolecular charge-transfer process based on dicyanomethylene-4H-pyran derivative: An integrated operation of half-subtractor and comparator

作者：Guo, Zhiqian[1]; Zhao, Ping[1]; Zhu, Weihong[1]; Huang, Xiaomei[1]; Xie, Yongshu[1]; Tian, He[1]

机构：[1] Key Laboratory for Advanced Materials, Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China

年份：2008

卷号：112

期号：17

起止页码：7047

外文期刊名：Journal of Physical Chemistry C

收录：EI(收录号：20082911387574)

语种：英文

外文关键词：Comparator circuits - Charge transfer - Comparators (optical) - Computer circuits

摘要：Integration of simple logic gates into combinational circuits is a crucial step for the performance of arithmetic systems and working automation. A half-subtractor has been reported in combination with a comparator based on the intramolecular charge transfer (ICT) process resulting from hosting two different guests with the binding of Zn2+ and the deprotonation of phenolic hydroxyl groups in an unimolecular system. The corresponding spectral shifts in absorption and a variation in fluorescence intensity were well elucidated. An XOR (exclusive OR) logic gate generates the difference digit of the half-subtractor reading at 445 nm, and two INHIBIT logic gates, which are basically AND gates with one of the inputs inverted through a NOT function, are achieved for the borrow digit of the half-subtractor when the output signals are monitored at 400 and 525 nm. Taken together, the comparison and subtraction operations are practically performed in parallel without mutual interference due to the same inputs and different outputs within the same molecule system. ? 2008 American Chemical Society.