周硼

个人信息Personal Information

副教授

硕士生导师

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:化学学院

学科:无机化学. 环境科学

电子邮箱:zhoupeng@dlut.edu.cn

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Dansyl-based fluorescent chemosensors for selective responses of Cr(III)

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论文类型:期刊论文

发表时间:2009-01-01

发表刊物:NEW JOURNAL OF CHEMISTRY

收录刊物:SCIE、Scopus

卷号:33

期号:3

页面范围:653-658

ISSN号:1144-0546

摘要:Three chemosensors DN1, DN2 and DN3, incorporating dansyl dye as a fluorophore and various carboxhydrazones as ionophores, are reported. DN1 contains a pyridine-carboxhydrazone tridentate coordination site, forming a 2: 1 stoichiometric complexation species with Cr(3+), and exhibits selectivity for Cr(3+) over alkali and alkaline earth metals and most first-row transition metals in aqueous media. DN1 displays high quantum yield (Phi = 0.86) and fluorescence enhancement following Cr(3+) coordination within a wide pH range. DN2 contains a 8-hydroxyquinoline-carboxhydrazone tetradentate metal-binding moiety, forming a 1:1 complex with Cr(3+). DN2 also exhibits significantly fluorescence enhancement but a much lower quantum yield following Cr(3+) binding in aqueous solution. In contrast, their congener DN3, having a salicyl-carboxhydrazone tridentate binding site, does not exhibit any significant fluorescence variation following Cr(3+) binding. These results demonstrate that the hydroxyl group is an important factor influencing the fluorescence response to Cr(3+) in aqueous media.