Photochromic behavior of a bisthienylethene bearing Cu(I)-1,10-phenanthroline complexes

All‐Optical Fine‐Tuning of Absorption Band of Diarylethene with Photochromic Acid‐Generating Spiropyran

“…Although the quantum yield of the photocyclization of 1o with 366 nm light in acetonitrile was 0.75, that of the complex with Cu(I) was only 0.026. Thus, the photoreactivity of 1o was modulated with Cu(I) ions . We have also shown that 1o forms a crystalline‐like solid material when mixed with oxalic acid in solution.…”

“…Although the spectroscopic properties of 1o and 1c were changed by complexation with the Cu(I) ion as a Lewis acid in acetonitrile to show a metal‐to‐ligand charge transfer (MLCT) band at around 450 nm and a 13 nm bathochromic shift of the main absorption band in the visible region, respectively, they were not induced by the addition of oxalic acid. However, when 4 eq of trifluoromethanesulfonic acid (TfOH) was added, the maximum absorption wavelength of 1c in chloroform shifted from 638 to 684 nm, i.e., a 46 nm bathochromic shift ( Figure ), and the Job's plot proved that one molecule of 1c accepted two protons .…”

One Scaffold, Many Possibilities – Copper(I)‐Catalyzed Azide–Alkyne Cycloadditions, Strain‐Promoted Azide–Alkyne Cycloadditions, and Maleimide–Thiol Coupling of Ruthenium(II) Polypyridyl Complexes

“…We assume the formation of a multinuclear ruthenium(II)–copper(I) species, in which the copper ion might coordinate to the triazole or imidazo units. Copper(I) species similar in structure to our assumed species absorb within the relevant wavelength region with significant absorption coefficients , . These observations need to be examined in more detail and are the subject of ongoing studies.…”

A highly selective ratiometric fluorescent Cu2+ and HSO4ˉ probe based on a new photochromic diarylethene with a 6-aryl[1,2-c]quinazoline unit

“…Owing to copper ion critical catalytic cofactor role in a variety of metalloenzymes, such as superoxide dismutase, cytochrome c oxidase, and tyrosinase [21e23], more and more researchers want to explore efficient recognition probes for Cu 2þ [24,25]. For instance, Tian et al reported a new dithienylethene molecule with 1,8-naphthalimidepiperazine and found that it not only could detect Cu 2þ but also exhibited tunable fluorescence induced by Cu 2þ , protons, and light [26].…”