The
function of a parity generator/checker, which is an essential
operation for detecting errors in data transmission, has been realized
with multiphotochromic switches by taking advantage of a neuron-like
fluorescence response and reversible light-induced transformations
between the implicated isomers.
The photochromic fluorescence switching of a fulgimide
derivative
was used to implement the first molecule-based D (delay) flip-flop device, which works based on the principles of sequential
logic. The device operates exclusively with photonic signals and can
be conveniently switched in repeated cycles.
We
show that FRET between Pacific Blue (PB) and Alexa488
(A488) covalently attached to a DNA scaffold can be reversibly
controlled by photochromic switching of a spiropyran derivative. With
the spiropyran in the closed spiro isomeric form, FRET occurs freely
between PB and A488. UV-induced isomerization
to the open merocyanine form shuts down the FRET process by efficient
quenching of the PB excited state. The process is reversed
by exposure to visible light, triggering the isomerization to the
spiro isomer.
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