2:1 multiplexing function in a simple molecular system.

School of Chemical Biology and Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China.
Sensors (Impact Factor: 2.05). 12/2012; 12(4):4421-30. DOI: 10.3390/s120404421
Source: PubMed

ABSTRACT 1-[(Anthracen-9-yl)methylene] thiosemicarbazide shows weak fluorescence due to a photo-induced electron transfer (PET) process from the thiosemicarbazide moiety to the excited anthracene. The anthracene emission can be recovered via protonation of the amine as the protonated aminomethylene as an electron-withdrawing group that suppresses the PET process. Similarly, chelation between the ligand and the metal ions can also suppress the PET process and results in a fluorescence enhancement (CHEF). When solvents are introduced as the third control, a molecular 2:1 multiplexer is constructed to report selectively the inputs. Therefore, a molecular 2:1 multiplexer is realized in a simple molecular system.

  • [Show abstract] [Hide abstract]
    ABSTRACT: The photochemical processes of singlet-singlet energy transfer and photoinduced electron transfer are important not only in natural and artificial photosynthetic energy conversion, but also in a variety of other scientific and technological applications. Controlling these functions at the molecular level using outside stimuli is an interesting scientific challenge. Photochromes, organic molecules that are isomerized by light between two stable forms, can be covalently linked to other chromophores, and changes in their properties resulting from photoisomerization used to switch electron and energy transfer on or off. Simple single- and double-throw molecular switches have been constructed, as well as Boolean logic gates. Such molecules are potentially useful in light-controlled molecular data processing and storage applications.
    Chemical Communications 04/2006; DOI:10.1039/b514736k · 6.72 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The evolution of research in luminescent signalling at Queen's University of Belfast is critically reviewed in the context of related work from the literature. Photoinduced electron transfer (PET) is found to be a robust design principle for such work. The possibilities raised by these signalling systems for sensing and switching operations are pointed out. Fluorescent PET signalling systems for s-block metal ions and relatives are classified according to the type of receptor employed. PET signalling systems, which exploit lanthanide lumophores are also woven into the discussion.
    Coordination Chemistry Reviews 08/2000; 205(1):41-57. DOI:10.1016/S0010-8545(00)00238-1 · 12.10 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Molecular and supramolecular logic gates are candidates for computation at the nanoscale level. Nowadays all common logic operations can be mimicked with molecular devices based on chemical approaches. One step further towards molecular systems with increased logic capabilities is the addition or subtraction of binary digits. This Minireview describes recent developments to attain this goal, including bioinspired systems based on DNA and enzymes. Furthermore, chemical molecular logic gates are discussed and compared critically with regard to alternative concepts.
    Angewandte Chemie International Edition 08/2007; 46(22):4026-40. DOI:10.1002/anie.200603990 · 11.34 Impact Factor


Available from