Synthesis and photochromic behaviour of new dipyrrolylperfluorocyclopentenes

Photoinduced Processes in Dipyrrolyl‐Perfluoro‐Cyclopentenes

“…The compounds investigated were prepared for previous works (12,13) and their purity (>98%) was checked by HPLC. Measurements were carried out in toluene (Uvasol Fluka) unless otherwise specified.…”

“…The bleaching is both thermal and photochemical. The syntheses and preliminary information about their photochromic behavior have already been reported in previous works (12,13). Compound 1 , bearing two cyanopyrrole rings, has been studied more in depth in ethyl acetate solutions (11) and is here reinvestigated in toluene to complete the available information and make a comparison with the other four analogues (2–5) in the same solvent.…”

Synthesis and properties of diiron complexes with heteroaromatic linkers: An approach for modulation of organometallic molecular wire

“…In a manner similar to the diiron molecular wire, DPE complex 6 was synthesized from the corresponding terminal alkyne precursor [14] by treatment with in situ generated [Cp ⁄ Fe(dppe)] + species in 84% yield (Scheme 1) and identified by conventional spectroscopic methods. UV irradiation of a THF solution of 6 at 0°C by high pressure Hg lamp through a cut filter (k < 360 nm) caused no spectral change.…”

“…UV irradiation of a THF solution of 6 at 0°C by high pressure Hg lamp through a cut filter (k < 360 nm) caused no spectral change. Because the organic precursor shows reasonable photocyclization reaction [14], this photo-insensitivity of 6 should result from the effect of the attached iron fragments. Similar behavior was observed for some of the iron-DTE complexes without the acetylene linkers [11a,11b], probably due to the existence of a lower-energy lying d-d excited state which effectively quenches …”

A multi‐addressable molecular switch based on a novel diarylethene with an imidazo [4,5‐f] [1,10] phenanthroline unit

“…In the past several decades, many new diarylethene systems with different heteroaryl moieties were explored. Among them, most of the central ethene containing bridging units were 3‐benzothienyl and 2‐thienyl groups, with just a few reports concerning other heteroaryl moieties, such as 3‐pyrolyl, 4‐thiazolyl, 4‐oxazolyl, 4‐pyrazolyl, 3‐indolyl, furan, benzofuran, and so on. Benzofuran is a fascinating aryl because of its relative lower aromatic stabilization energy that can be potential to improve the thermal stability of diarylethenes .…”