Aggregation-induced emissions in the mesogenic BF2complexes of aroylhydrazines

Yi Hong Cai, Hsin Yun Chih, Gene Hsiang Lee, Chung K. Lai

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Abstract

Herein, we report the synthesis of two new families of borondifluoride complexes derived from aroylhydrazines and the investigation of their mesomorphic and AIE properties. The crystallographic structure of the mesogenic complex1a-BF2(n= 8) was determined by X-ray analysis; it crystallizes in theP1̄ triclinic space group and the geometry of boron atoms is tetrahedral. The crystal is considered to be linear-shaped with a length ofL∼ 33.92 Å. A relatively small dihedral angle ofca.3.30°-5.75° was observed between both neighboring phenyl groups and tetrahedral BF2moiety. Mesomorphic properties were crucially impacted by the structure of the terminal group. Ligands1a-bwere not mesogenic; however, both the series of1a-BF2and1b-BF2complexes formed SmC or/and N phases. The H-bonding interactions are attributed to the occurrence of mesomorphism in compounds1-BF2, which was supported by FT-IR spectroscopy. The optical property of the boron complexes is related to their molecular structures, and they emitted blue-to-green emissions atλmax= 445-466 nm in CH2Cl2. Compounds1a-BF2aggregated in higher water fractions (fw), which turned on their light emission process, whereas weak PL signals were recorded atfw< 50% because the luminogen was fully dissolved and quenched in these solvent compositions. The PL intensity was enhanced atfw> 60% until it reached the maximum intensity atfw∼ 90%. Thus, compound1a-BF2is AIE active.

Original languageEnglish
Pages (from-to)12557-12568
Number of pages12
JournalNew Journal of Chemistry
Volume45
Issue number28
DOIs
StatePublished - 28 Jul 2021

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