Turn-on and reversible luminescent sensor for selective recognition of Al³⁺ using naphthol hydrazone

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• 作者：Soma Mukherjee^a ; ^{sommukh445@yahoo.co.in" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Palash Mal^aAuthor Vitae ; Helen Stoeckli-Evans^bAuthor Vitae
• 关键词：Luminescent sensor ; Al3+ ; Crystal structure
• 刊名：Journal of Luminescence
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：172
• 期：Complete
• 页码：124-130
• 全文大小：1596 K

文摘

Two ligands 1 and 2 have been synthesized for the selective fluorescent recognition of Al³⁺ ions in aqueous medium (DMSO 5% v/v, pH 7). The ligand 2 displayed dramatic increment of emission intensity with considerable red shift in the presence of Al³⁺ and it exhibited better sensitivity compared to 1. The quantum yields for 2 and 2-Al³⁺ were determined as 0.006 and 0.196 respectively. Job plot indicated a 1:1 stoichiometric binding of 2 with Al³⁺ and the association constant for 2-Al³⁺ was determined as 1.3×10⁴ M^−1 by the Hill plot. The addition of Na₂EDTA quenches the fluorescence of 2-Al³⁺ indicating that the ligand 2 is a reversible fluorescent chemosensor and it can detect submicromolar concentrations of Al³⁺. The crystal structure of 1 was obtained from single crystal X-ray diffractometry.