标题:Periodic mesoporous organosilicas for ultra-high selective copper(II) detection and sensing mechanism
作者:Xiaoyong Qiu;Shuhua Han;Yongfeng Hu
作者机构:[Qiu, X] Key Lab of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China;[ Han, S] Key Lab of Colloid and 更多
通讯作者地址:[Han, SH]Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.
来源:Journal of Materials Chemistry, A. Materials for energy and sustainability
出版年:2014
卷:2
期:5
页码:1493-1501
DOI:10.1039/c3ta14314g
摘要:Using the novel bis{rhodamine Schiff-base derivative) bridged precursor with four silyl groups (BRh-Si4) and tetraethoxysilane as the organosilica source, bistrhodamine Schiff-base derivative) bridged periodic mesoporous organosilicas (BRhPMOs) with mesoscopic and molecular scale periodicities are prepared through the supramolecular self-assembly of ionic liquid l-hexadecyl-3-methylimidazolium bromide (C_(16)mimBr). BRhPMOs with BRh units distributed uniformly in the framework, which show ultra-high selectivity towards copper ions, could be used as a Cu~(2+) fluorescence-ON chemosensor. The recognition mechanism of BRhPMOs towards Cu~(2+) has been investigated by Cu K-edge X-ray absorption fine structure spectroscopy (XAFS). The high selectivity of BRhPMOs towards Cu~(2+) can be attributed to the strong chelation of \"N\" atoms of the Schiff base in the BRh units to copper ions, leading to effective charge transfer between the BRh fluorophores and targeted metal ions. Owing to the encapsulation effect of the silica network, BRh chrdmophores in the form of BRhPMOs after chelating with copper ions exhibit higher photostability against long-term irradiation than rhodamine 6G (R6G) or Cu~(2+)-chelated BRh—Si4, indicating their potential applications in biosensing and bioimaging. The perfect combination of functional fluorophores with periodic mesoporous organosilicas (PMOs) will open new avenues for applications in biotechnology and information technology.
收录类别:EI;SCOPUS;SCIE
WOS核心被引频次:22
Scopus被引频次:23
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-84891469741&doi=10.1039%2fc3ta14314g&partnerID=40&md5=cb5444d39dfa4d8d6c5cc0a441bc7999
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