联苯基席夫碱化合物聚集诱导发光特性及潜指纹成像

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Aggregation-induced Emission Propertiesand Latent Fingerprint Imaging of Biphenyl-based Schiff Base Compounds

JIANG Qingyi，CHEN Chunlin，LI Shan，CHEN Yinghe，DONG Guanchen，ZHANG Bangcui， GAOShulin，WANGJianfei*，YANGYanhua* （YunnanKeyLaboratoryofMetal-OrganicMolecularMaterialsndDevice，SchoolofChemistryandChemicalEngineering， KunmingUniversity，Kunming650214，China） （2号 Corresponding Authors，E-mail：wang03507856284@126.com；yh_yangkmu@126.com

Abstract：To explore the optical properties and practical applications of biphenyl-based Schiffbase compounds， two Schiff base compounds， 3，3′′ （ 4，4′′′ -bis（diphenylamino）- ⌊1，1′：4′，1′′：4′′，1′′′ -quaterphenyl] ⋅2′′，3′ -diyl）bis （azanylylidene）bis（methanylylidene）bis（ ⌊1，1′ -biphenyl]-4-ol）（LFP-1）and 3，3′′-（⌊1，1′：4′，1′′：4′′，1′′′ -quaterphenyl]- ⋅2′′，3′ -diyl）bis（azanylylidene）bis（methanylylidene）bis（[1， 1′ -biphenyl]-4-ol）（LFP-2），weredesigned and synthesized. These compounds were constructed using 4， 4′ -dibromobiphenyl-2， 2′ -diamine as the molecular skeleton，which the π -conjugatedsystemswere extended at the 4，4′ -positionsand lateral groupswere introduced at the 2，2′ -positions.Optical performance testing revealed that both compounds exhibited excited-state intramolecular proton transfer（ESIPT）and aggregation-induced emision（AIE）properties in dimethyl sulfoxide/water mixtures. Furthermore，thesecompounds hadtheabilitytovisualizelatentfingerprintsonthreetypesofsubstrates：blades，tinfoil，andstainlesstel.Thefirst-，second-，andthid-levelfingerprintdetailswereclearlyidentifiable，ighlighting their potential for practical applications in forensic science.These findings layasolid foundation for thedesignof advanced materials for latent fingerprint visualization.

Key Words：biphenyl-based Schiff base；aggregation-induced emission; latent fingerprint imaging

1引言

联苯基团是由两个苯环通过C一C单键连接而成的刚性结构，其平面性较好，但邻位氢原子间的空间斥力及 π 电子的离域效应会影响其平面性和电荷特性2。（剩余19927字）