期刊
TALANTA
卷 82, 期 2, 页码 845-849出版社
ELSEVIER
DOI: 10.1016/j.talanta.2010.05.003
关键词
Pyrimidine; 5-Aminouracil; Schiff base; Aluminium; Colorimetric receptor
资金
- CSIR, New Delhi [01(2258)/08/EMR-II]
An interference-free naked-eye recognition of Al3+ at its micromolar level has been done in 5% aqueous DMSO solution employing a Schiff base 5-[(2-hydroxy-5-nitro-benzylidene)-aminol-1H-pyrimidine-2,4-dione (receptor 1) which is an intramolecular charge transfer (ICT) probe. The pyrimidine and nitrophenyl groups serve as electron rich (donor) and deficient (acceptor) pockets in receptor 1 exhibiting a broad ICT band at 434 nm (olive green). The concomitant additions of Al3+ as its chloride salt to the 5 x 10(-5) M aqueous DMSO solution of the receptor 1 lead hypsochromic shifting of its ICT band to 395 nm (colorless). The same ICT band undergoes a marginal bathochromic shifting (6 nm) along with a hyperchromic shift on separate additions of a basic anion like F-, CH3COO- and H2PO4- to the receptor 1 and faced almost similar fate on concomitant additions of Al3+ as mentioned above. (C) 2010 Elsevier B.V. All rights reserved.
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