Tuning the Fluorescence in Dynamic Covalent Bonded Liquid Crystals

Abstract

A series of emissive liquid crystalline materials based on salicylidene derivatives is reported and investigated with respect to their thermoresponsive and mechanochromic properties. Single-crystal analysis and temperature-dependent powder Xray diffraction measurements allowed us to correlate the intermolecular organization of the mesogens with thermoresponsive changes in the fluorescence behavior. As a proof-ofprinciple study, we employed the dynamics of the imine bond in transamination reactions for postsynthetic tuning of the fluorescence behavior as a further step toward the development of adaptive materials.

Effect of twisted molecular geometry on the solid-state emissions of an anthracene fluorophore

“…the relative orientation of the anthracene motif and 4-hydroxyphenyl group. [41][42][43][44][45][46] Using this system, we sought to elucidate how the presence of a hydrazone CN linkage could influence the packing behaviour of anthracene motifs. In particular, we inquired whether the hydrazone CN linkage could adopt cisoid and transoid geometries in the solid (Scheme 1), and if such structures could be isolated.…”

Bionic Plasmonic Nanoarrays Excited by Radially Polarized Vector Beam for Metal-Enhanced Fluorescence

“…Fluorescence technology, e.g., fluorescence spectroscopy [ 1 , 2 ], super-resolution fluorescence imaging [ 3 ], fluorescence correlation spectroscopy [ 4 ], has been widely exploited in fields of biology [ 5 ], materials [ 6 ], diagnostics [ 7 ], chemistry [ 8 ], etc. The accessible fluorescence intensity and detection volume largely dominate its detection limits.…”