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Liquid-Phase Epitaxial Growth of Azapyrene-Based Chiral Metal–Organic Framework Thin Films for Circularly Polarized Luminescence

Chen, Shu-Mei, Chang, Li-Mei, Yang, Xue-Kang, Luo, Ting, Xu, Hai, Gu, Zhi-Gang, Zhang, Jian
ACS applied materials & interfaces 2019 v.11 no.34 pp. 31421-31426
adsorption, circular dichroism spectroscopy, enantiomers, enantioselectivity, films (materials), ligands, luminescence, models, optical isomerism
Development of chiral metal–organic frameworks (MOFs) for circularly polarized luminescence (CPL) is a challenging but important task. In this work, we report a first example of azapyrene-based chiral MOF thin films [Zn₂Cam₂DAP]ₙ grown on functionalized substrates (named SURchirMOF-4) for CPL property. By using a liquid-phase epitaxial layer-by-layer method, the resulted SURchirMOF-4 was constructed from chiral camphoric acid and 2,7-diazapyrene ligand, which has high orientation and homogeneity. The circular dichroism, CPL, and enantioselective adsorption results show that SURchirMOF-4 has strong chirality and CPL property as well as good enantioselective adsorption toward enantiomers of methyl-lactate. The synthesis of azapyrene-based chiral MOF thin films not only represents an ideal model for studying the enantioselective adsorption, but also will be a valuable approach for development of the chiral thin film exhibiting CPL property.