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- W2006657566 abstract "Abstract Two 9,9′‐(ethane‐1,2‐diyl)bis(anthracene) ligands, incorporating an ethano bridge, namely the bis‐anthracene coronand 1 and the bis‐anthracene cryptand 2 , respectively, have been studied in parallel to compare their binding abilities, spectroscopic and photochemical properties in the presence and absence of cations as a function of their X‐ray structure. The ethano bridge imposes a twisted shape (torsion angles between the vicinal C‐H being 47° for 1 and 62° for 2a and 47° for 2b , the two conformers of compound 2 ), which inhibits the cation‐binding ability of 1 and attenuates that of cryptand 2 (log K s ≈︁ 1.8 for Na + or K + , ≈︁ 4 for Tl + and ≈︁ 8 for Ag + ); in CH 3 OH, both 1 and 2 emit essentially excimer‐type fluorescence at λ max 520‐535 nm, which is red‐shifted compared with that of the single crystals ( ≈︁ 465‐480 nm) where the rotation about the CH 2 ‐CH 2 bond is hindered. The presence of cations, which has no influence on the photocycloisomerization quantum yield of 1 (as expected), clearly affects that of 2 . Cryptand 2 was shown to display photochromic properties." @default.
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- W2006657566 date "1995-01-01" @default.
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- W2006657566 title "Synthesis, X-ray structure, spectroscopic and cation complexation studies of macrocyclic ligands incorporating the 9,9′-(ethane-1,2-diyl)bis(anthracene) photoactive subunit" @default.
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- W2006657566 doi "https://doi.org/10.1002/recl.19951141115" @default.
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