Fig. 4: Exploration of morphology and microstructure.
From: Rapid room-temperature phosphorescence chiral recognition of natural amino acids
SEM images of doped guest-host samples of a L@L and b D@L obtained by recrystallization with tetrahydrofuran (THF); c L@L and d D@L obtained by recrystallization with chloroform (CHCl3) and n-hexane (HEX) (90: 10). e Delayed emission (Δt = 5 ms) spectra of L@L and D@L by recrystallization with THF (solid borderline) and CHCl3: HEX = 90: 10 (dash borderline) in air at 298 K (λex = 247 nm). f The phosphorescence intensity of different doped samples for different solvent systems. (The guest-to-host ratio is 0.1% for all samples above in the solid state) g, h The sum frequency generation (SFG) spectra of the host and doped samples (w/w = 0.01–1%) with different polarization combinations: g ppp-SFG spectra; h ssp-SFG spectra.
