Conformationally confined three-armed supramolecular folding for boosting near-infrared biological imaging

Abstract

Herein, a triphenylamine derivative (TP-3PY) possessing 4-(4-bromophenyl)pyridine (PY) as electron-accepting group and tris[p-(4-pyridylvinyl)phenyl]amine (TPA) with large two-photon absorption cross-sections as electron-donating group was obtained, which showed intense absorption at visible...

Cucurbit[8]uril-mediated triphenylamine coumarin derivative cascade assembly for NIR targeted cell imaging

“…5 It is well-known that some macrocyclic molecules, such as cyclodextrin (CD), 6 and cucurbit[ n ]uril (CB[ n ]), 7 have hydrophilic outer walls and hydrophobic cavities, allowing them to encapsulate fluorescent molecules and enhance their fluorescence emission by limiting their non-radiative transitions in water. Among them, CB[ n ]s can encapsulate neutral and cationic guest molecules with different chemical stoichiometric ratios, and modulate the luminescence behavior of the guest by inducing intermolecular dimerization 8 or folding 9 based on the macrocycle confinement. At the same time, the guest molecules encapsulated by CB[ n ]s can be further used for supramolecular cascade assembly to provide an excellent Förster resonance energy transfer (FRET) platform for dyes, achieving NIR fluorescence emission with Stokes shift.…”