title: The Influence of the π-Conjugated Spacer on Photophysical Properties of Difluoroboranyls Derived from Amides Carrying a Donor Group.
abstract: A series of difluoroboranyls derived from amides carrying a variable π-conjugated spacer between the electron-donating (D) and electron-accepting (A) groups was synthesized and characterized with (1)H, (11)B, (13)C, (15)N, and (19)F NMR, electronic absorption, fluorescence spectroscopies, and first-principle calculations. The D-to-A distance in the series varied from 1.5 to 4.5 Å, causing bathochromic shifts of both the absorption and fluorescence maxima by more than 120 and 213 nm, respectively. These trends are rationalized by quantum-mechanical calculations that allow for quantification of the charge-transfer distance. Theoretical calculations were also performed to determine the vibronic couplings and thus to reproduce the experimental band shapes.
authors.affiliation: Faculty of Chemistry, Wrocław University of Technology , Wyb. Wyspiańskiego 27, PL-50370 Wrocław, Poland.
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Grabarz
authors.affiliation: Laboratoire CEISAM, UMR CNRS 6230, Université de Nantes , 2 Rue de la Houssinière, BP92208, 44322 Cedex 3 Nantes, France.
authors.forename: Adèle D
authors.initials: AD
authors.lastname: Laurent
authors.affiliation: Faculty of Chemical Technology and Engineering, UTP University of Science and Technology , Seminaryjna 3, PL-85326 Bydgoszcz, Poland.
authors.forename: Beata
authors.initials: B
authors.lastname: Jędrzejewska
authors.affiliation: Faculty of Chemical Technology and Engineering, UTP University of Science and Technology , Seminaryjna 3, PL-85326 Bydgoszcz, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Zakrzewska
authors.affiliation: Laboratoire CEISAM, UMR CNRS 6230, Université de Nantes , 2 Rue de la Houssinière, BP92208, 44322 Cedex 3 Nantes, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Jacquemin
authors.affiliation: Faculty of Chemical Technology and Engineering, UTP University of Science and Technology , Seminaryjna 3, PL-85326 Bydgoszcz, Poland.
authors.forename: Borys
authors.initials: B
authors.lastname: Ośmiałowski