SPIRO[2H]-1-BENZOPYRAN-2,9'-FLUORENES - HYPERCHROMIC AND BATHOCHROMICSHIFTS OF THE VISIBLE ABSORPTION OF CHROMENES

Authors
POZZO JL HARIE G LOKSHIN V SAMAT A GUGLIELMETTI R
Citation
Jl. Pozzo et al., SPIRO[2H]-1-BENZOPYRAN-2,9'-FLUORENES - HYPERCHROMIC AND BATHOCHROMICSHIFTS OF THE VISIBLE ABSORPTION OF CHROMENES, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 297, 1997, pp. 255-262
Citations number
12
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
297
Year of publication
1997
Pages
255 - 262
Database
ISI
SICI code
1058-725X(1997)297:<255:S-HAB>2.0.ZU;2-5
Abstract
The synthesis of spiro[fluorene-naphthopyrans] and spiro[fluorene-fura no[3,2-f]chromenes] allowed us to quantify the role of fluorene moiety towards photochromic properties. Compared to corresponding diphenylch romenes, the extended Pi system delocalization causes a bathochromic s hift of the visible absorption of the colored merocyanines. Whatever t he right hand side in the studied series, an hyperchromic effect is ob served.