Fast and Selective Luminescent Sensing by Langmuir–Schaeffer Films Based on Controlled Assembly of Perylene Bisimide Modified with A Cyclometalated AuIII Complex

Author:

Zhang Jing1,Shi Zhiwei2,Liu Ke1,Shi Qiyuan1,Yi Liang1,Wang Junjie1,Peng Lingya1,Liu Taihong1ORCID,Ma Miao2,Fang Yu1ORCID

Affiliation:

1. Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710119 P. R. China

2. School of Computer Science Shaanxi Normal University Xi'an 710019 P. R. China

Abstract

AbstractCondensed films of functional luminophores dominated by the magnitude and dimensionality of the intermolecular interactions play important roles in sensing performance. However, controlling the molecular assembly and regulating photophysical properties remain challenging. In this study, a new luminophore, ortho‐PBI‐Au, was synthesized by anchoring a cyclometalated alkynyl‐gold(III) unit at the ortho‐position of perylene bisimide. An unprecedented T‐type packing model driven by weak Au‐π interaction and Au−H bonds was observed, laying foundation for striking properties of the luminophore. Controlled assembly of ortho‐PBI‐Au at the air‐water interface, realized using the classical Langmuir–Schaeffer technique, afforded the obtained luminescent films with different packing structures. With an optimized film, sensitive, selective, and rapid detection of a hazardous new psychoactive substance, phenylethylamine (PEA), was achieved. The detection limit, response time, and recovery time were <4 ppb, <1 s, and <5 s, respectively, surpassing the performance of the PEA sensors known thus far. The relationship between the characters of films and the sensing performance was systematically examined by grey relational analysis (GRA). The present study suggests that designing novel molecular aggregation with definite adlayer structure is a crucial strategy to enhance the sensing performance, which could be favorable for the film‐based fluorescent sensors.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Higher Education Discipline Innovation Project

Publisher

Wiley

Subject

General Medicine

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