Blue two-photon excited fluorescence of several D-π-D, A-π-A, and D-π-A compounds featuring dimesitylboryl acceptor

N‐Aryl‐ and N‐Thienylcarbazoles with Dimesitylboryl and 1,3,2‐Benzodiazaborolyl Functions

“…The plane of the carbazole and the plane defined by the N(1), C(30), and C(21) atoms enclose a dihedral angle of 28.2°and compares with the dihedral angles between the BC 3 planes and the fluorenyl plane (32.7°and 21.2°) in compound 7 (Figure 3). [17] These angles are markedly smaller than those between the NBC 2 plane and the mesityl rings in 1 (65.6°and 58.1°) and those between the BC 3 (Figure 3). [18] Thus, molecule 1 is closer to planarity than the four conformers of the carbazole derivative 4a (interplanar angles 55.9-77.7°; av.…”

The synthesis, photophysical properties and fluoride anion recognition of a novel branched organoboron compound

“…To examine the optical properties of this V-shaped branched system in context, a comparison with those of its linear dipolar counterpart BN [6] was carried out. It was found that, B 2 N possesses longer wavelength absorption and fluorescence maxima, and exhibits weaker fluorescence solvatochromism relative to BN.…”

“…Compared with BN, the absorption maximum of B 2 N is obviously red-shifted and the absorbance greatly increases. For example, the l max (abs) of B 2 N in THF is red-shifted by 22 nm (422 vs 400 nm [6]) and the absorbance increases 51% (64,800 vs 43,000 cm M À1 ) relative to BN. Thus, it appears that there are intramolecular coupling effects between the branches connected by the phenylamino group.…”

“…In recent years, our group has developed a series of dimesitylboryl-containing dipolar donor-p-acceptor type compounds and examined their two-photon excited fluorescence properties [6,7] and utility as chemosensors for fluoride anions with high selectivity and sensitivity [5]. For an ideal two-photon sensor, a large twophoton absorption cross-section, high fluorescence quantum yield and high photo and thermal stability are necessary factors.…”

A trivalent organoboron compound as one and two-photon fluorescent chemosensor for fluoride anion

“…Compound B (Scheme 1) was prepared as we reported previously [34]. All the other chemicals used were analytical reagents from Acros.…”