Long‐Lived Multiple Charge Separation by Proton‐Coupled Electron Transfer

Abstract

Multiple charge separation has been successfully realized by a proton-coupled electron transfer reaction in an organic cocrystal. Benefiting from the adjustable electronic energy level of the electron donor and acceptor through thermal-induced proton migration, distinct optical absorption behaviors combined with color changes to blue or green are observed in these charge-separated states. It is of interest to note that such charge-separated states exhibit a longer lifetime of over a month as a result of the excellent coplanarity and π-π interaction of the electron acceptors. Moreover, the enhanced absorption toward longer wavelengths endows the charge-separated state with near-infrared (808 nm) photothermal conversion for imaging and bacterial inhibition, whereby the conversion performance can be controlled by the degree of proton migration.

Azaacene containing iridium(iii) phosphors: elaboration of the π-conjugation effect and application in highly efficient solution-processed near-infrared OLEDs

“…S5 and S6, ESI†). 54,55 In comparison with (qupt) 2 Ir(acac), DBPzIr and PPzIr present a bathochromic shift in the PL spectra by 42 and 85 nm, which is consistent with their red-shifted absorption spectra. Moreover, 4- tert -butylphenyl rather than long alkoxy chains at 11,12-positions can induce a large bathochromic shift of the resulting complexes, indicating that the electron-withdrawing ability and conjugation degree of the azaacene core are maintained in DBPzIr and PPzIr .…”

Confinement of Pyridine Derivatives into a Metal–Organic Framework Host as Electron Acceptors to Achieve Photoinduced Electron-Transfer

“…Notably, strong O–H···N hydrogen bonds exist between μ 2 -H 2 O oxygen atoms and pyridine nitrogen atoms in these compounds (the O···N distances are 2.673 and 2.695 Å for 1 , 2.626 Å for 2 , 2.585, 2.617, and 2.625 Å for 3 , and 2.643 Å for 4 ; Figures S6–S9 and Table S2). Strong hydrogen bonds typically produce two broad and well-defined bands, appearing around 1850–2000 and 2450–2600 cm –1 , which are associated with the OH stretching motion with a low central barrier. , In the IR spectra of 1 – 4 , the broad peaks around 1860 cm –1 of 1 (Figure S10), 1900 and 2460 cm –1 of 2 (Figure S11) and 3 (Figure S12), and 1870 and 2320 cm –1 of 4 (Figure S13) further demonstrate the existence of strong hydrogen bonds, in accordance with the structure analysis. Extra (α-C–H) pyridine ···O carboxylate hydrogen bonds exist in compounds 2 and 3 with C···O distances of 3.396 and 3.395 Å, respectively (Figures S7–S8 and Table S2).…”

“…Strong hydrogen bonds typically produce two broad and well-defined bands, appearing around 1850−2000 and 2450−2600 cm −1 , which are associated with the OH stretching motion with a low central barrier. 40,41 In the IR spectra of 1−4, the broad peaks around 1860 cm −1 of 1 (Figure S10), 1900 and 2460 cm −1 of 2 (Figure S11) and 3 (Figure S12), and 1870 and 2320 cm −1 of 4 (Figure S13) further demonstrate the existence of strong hydrogen bonds, in accordance with the structure analysis. S2).…”

The simultaneous modulation effect of N-substituents on the photochromic and electrochromic properties of naphthalenediimide-based coordination polymers

“…[1][2][3][4][5][6][7][8][9][10] Until now, most of the SRCM can only respond to one kind of stimulus and severely limit their practical applications. [11][12][13][14][15][16][17] Therefore, the construction of bifunctional SRCM is particularly important for extending their application scope. Generally, the introduction of redox-active linkers into coordination polymers (CPs) is an important strategy for the construction of bifunctional photo-/electrochromic materials.…”