title: Tuning of the colour and chemical stability of model boranils: a strong effect of structural modifications.
abstract: A series of diarylborinic complexes with salicydeneaniline ligands bearing various functional groups at the 6-position have been synthesized in high yields by applying a straightforward one-pot multicomponent protocol. UV-Vis measurements revealed the influence of electronic character of substituents on the observed maximum of emission (λem). This has been confirmed by a relatively strong linear correlation (R(2) = 0.92) of λem with Hammett σp(+) constants. Such a correlation was investigated using a QTAIM analysis of the charge density distribution. Absorption and emission bands for the obtained systems span between 390-437 nm and between 506-590 nm, respectively, with quantum yields reaching 17%. Time-dependent UV-Vis absorption measurements revealed that diphenylborinic salicydeneaniline complexes undergo slow degradation in solution under ambient conditions. In contrast, the use of a naphthalene-based chromophore or the introduction of fluorinated phenyl groups at the boron atom resulted in stable systems.
authors: Physical Chemistry Department, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland. grzegorz.wesela@chem.uw.edu.pl serek@ch.pw.edu.pl.
authors: Grzegorz
authors: G
authors: Wesela-Bauman
authors: Mateusz
authors: M
authors: Urban
authors: Sergiusz
authors: S
authors: Luliński
authors: Janusz
authors: J
authors: Serwatowski
authors: Krzysztof
authors: K
authors: Woźniak