Tracing absorption and emission characteristics of halogen-bonded ion pairs involving halogenated imidazolium species

Abstract

We investigate how the absorption and fluorescence of halogenated imidazolium compounds in acetonitrile solution is influenced by the presence of counterions and the ability to act as halogen-bond donors. Experimental...

Unveiling Halogen-Bonding Interactions between a Pyridine-Functionalized Fluoroborate Dye and Perfluorohaloarenes with Fluorescence Spectroscopy

“…In fact, previously it has been shown that electronic spectroscopy can be useful in the study of halogen bond in molecular complexes. 32 It is known that a very efficient BF 2 -/BF-carrying fluorophores (similar to classical BODIPYs) hold a privileged spot due to high fluorescence quantum yields (FQYs) deriving from a rigid core in their structure. Similar rigidity, crucial for enhancing the radiative dissipation of excitation energy, is the characteristics of several close-relative families of dyes: boranils, 33,34 ketonates, 35,36 or ketoiminates.…”

“…The present study contributes to these efforts and aims at studying the changes in electronic absorption and emission spectra upon interactions of an emissive pyridine-functionalized dye with perfluorohaloarenes (C 6 F 6 , C 6 F 5 Cl, C 6 F 5 Br, and C 6 F 5 I) in the two-component-only liquid phase. In fact, previously it has been shown that electronic spectroscopy can be useful in the study of halogen bond in molecular complexes …”

“…In fact, previously it has been shown that electronic spectroscopy can be useful in the study of halogen bond in molecular complexes. 32 …”

Enhanced Intersystem Crossing in a Thiohelicene

“…Apparently, excitation of 6I into the S 1 $${\leftarrow }$$ S 0 absorption band leads to homolytic cleavage of the iodine atom at C 6 with high quantum yield [60–63] . The resulting radicals in solution are stabilized by hydrogen abstraction from the solvent, while the iodine atoms combine to molecular iodine.…”