Near-Infrared Phosphorescence Emission of Binuclear Mn(II) Based Metal-Organic Framework for Efficient Photoelectric Conversion

• Published in: Frontiers in chemistry Vol. 8; p. 593948
• Main Authors: Zhang, Mei-Li, Zhai, Zhi-Min, Yang, Xiao-Gang, Huang, Ya-Dan, Zheng, Yan-Jin, Ma, Lu-Fang
• Format: Journal Article
• Language: English
• Published: Frontiers Media S.A 11.11.2020
• Subjects: Chemistry; host-guest; metal-organic framework; photoelectron performance; room temperature phosphorescence; π-stacking
• ISSN: 2296-2646; 2296-2646
• DOI: 10.3389/fchem.2020.593948

The development of metal-organic framework (MOF) based room-temperature phosphorescence (RTP) materials has raised extensive concern owing to their widespread applications in the field of anti-counterfeiting, photovoltaics, photocatalytic reactions, and bio-imaging. Herein, one new binuclear Mn(II) based 3D MOF [Mn 2 (L)(BMIB)·(H 2 O)] ( 1 ) (H 5 L = 3,5-bis(3,5-dicarboxylphenxoy) benzoic acid, BMIB = tran-4-bis(2-methylimidazolyl)butylene) has been synthesized by a facile hydrothermal process. In 1 , the protonated BMIB cations show infinite π-stacking arrangement, residing in the channels of the 3D network extended by L ligand and binuclear Mn(II) units. The orderly and uniform host-guest system at molecular level emits intense white light fluorescence and long-lived near infrared phosphorescence under ambient conditions. These photophysical processes were well-studied by density functional theory (DFT) calculations. Photoelectron measurements reveal high photoelectron response behavior and incident photon-to-current efficiency (IPCE).