pH-Controlled Luminescence Turn-On Behaviour of a Water-Soluble Europium-Based Molecular Complex

被引：20

作者：

Singha, Debal Kanti ^{[1
]}

Majee, Prakash ^{[2
]}

Mondal, Sudip Kumar ^{[2
]}

Mahata, Partha ^{[1
]}

机构：

[1] Suri Vidyasagar Coll, Dept Chem, Birbhum 731101, W Bengal, India

[2] Visva Bharati Univ, Dept Chem, Siksha Bhavana, Santini Ketan 731235, W Bengal, India

来源：

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | 2016年 / 28期

关键词：

Europium; Hydrothermal synthesis; Ligand effects; Luminescence; pH dependence; LANTHANIDE-ORGANIC-COMPLEXES; PHOTOPHYSICAL PROPERTIES; PROBES; LIGAND; SELECTIVITY; PHOSPHATE; PYRIDINE; SENSOR; EXCITATION; EFFICIENCY;

D O I：

10.1002/ejic.201600535

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We have successfully synthesized a new europium metal-organic complex (MOC) [Eu-2(pydcH)(6)]center dot 3H(2)O (1, H(2)pydc = 2,6-pyridinedicarboxylic acid) by the hydrothermal technique as well as simple solvent evaporation in water. Single-crystal Xray crystallographic data of 1 confirms a molecular complex of tricapped trigonal prismatic Eu3+ ions with a free carboxylic acid site of each 2,6-pyridinedicarboxylic acid ligand. Complex 1 is water-soluble and remains stable in a broad pH range of 2-11. Upon excitation at 280 nm 1 shows a characteristic ligand-sensitized metal-centred visible red luminescence. The luminescence of complex 1 can be further enhanced by changing the pH of the solution in the range of 2-6. Besides, the luminescence response is completely reversible in the range of pH 2-6. The mechanism of the pH-dependent luminescence behaviour is successfully explained and supported by UV/Vis absorption and IR spectroscopic experiments.

引用

页码：4631 / 4636

页数：6

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