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(a)
(b)
(c)
(d )
Fig. 15.6 Absorption spectral changes of 4o and 2mc in MeCN in the presence of triethylamine
at room temperature. a Irradiation of 313 nm light (5 min), then 450 nm light (4 min); b successive
irradiation to the solution of (a) with 313 nm light; c thermal change of 2sp to 2mc; d irradiation
of 578 nm light to the solution of (c). Concentration: 4o 2.50 × 10 −5 mol dm −3 , 2mc 2.50 ×
10 −5 mol dm −3 , Et 3 N 2.50 × 10 −6 mol dm −3 . Light intensity: (a) 313 nm 0.400 mW cm −2 ; (b)
450 nm 0.420 mW cm −2 ; (c) 313 nm 0.400 mW cm −2 ; (d) 578 nm 2.20 mW cm −2 . Reprinted with
permission from [16]. Copyright 2016 American Chemical Society
Chart 15.3 Schematic diagram of all-optical lock/unlock system of thermally irreversible
photochromic 4o with thermally reversible photochromic 2mc as the key. Adapted with permission
from [16]. Copyright 2016 American Chemical Society