Fluorescence of the cis-dimers of porphyrins containing ethylene bridges

Oxygen Activation Chemistry of Pacman and Hangman Porphyrin Architectures Based on Xanthene and Dibenzofuran Spacers

“…3. Trends in bond lengths and angles of macrocyclic core structures and side chains agree well with those observed in related systems including H 4 (DPA), H 4 (DPB), and 1,2-bis [5-(2,3,7,8-12,13,17,18-octaethylporphyrinato)]-cis-ethene porphyrins (80)(81)(82)(83).…”

Oligoporphyrins with One-and Two-Atom Covalent Bridges: Synthesis and Reactivity, Solid-State, Solution and Electronic Structures, Spectroscopy and Applications

“…49,158 Shishporenok and Chirvony reported that a complicating factor was the unavoidable presence of the corresponding (E) isomers, either as endogenous impurities that accumulated upon storage, or as the products of photoisomerization. The latter reaction was confirmed by illumination with an incandescent lamp.…”

“…The latter reaction was confirmed by illumination with an incandescent lamp. 158 By careful accounting for the impurity, the actual emission of the (Z ) isomer was found to consist of a weak, broad, structureless band peaking at ca. 680 nm, having a lifetime of only ca.…”

“…The ultrafast deactivation of the photoexcited (Z ) isomers recalls the discussion above on the excited-state conformations of the (E) isomers. 49,158 With the availability of β-unsubstituted DAP/TriAP and the interest in NLO possibilities of conjugated diporphyrins, instead of the more crowded OAP type, Anderson and coworkers prepared the Zn 2 dimer 42a and recorded its emission and excited-state properties. 66 The steady-state fluorescence was dominated by the NIR maximum at 765 nm [steady-state fluorescence quantum yield (Φ F ) 0.041, S 1 lifetime 0.76 ns].…”