Abstract
A pyrimidine derivative, [(4,6-dimethyl-2-pyrimidinyl)thio] acetic acid (Hdpmta) has been synthesized and used as an ionophore in a Pb2+-selective electrode. The electrode works well over a wide range of concentration (1.0 × 10−5 to 1.0 × 10−2 mol L−1) with the response slope of 27.4 mV decade−1. The electrochemical behavior of Hdpmta on glassy carbon electrode shows that in 0.1 mol L−1 TBAP/DMF solution, it has a well-defined irreversible cathodic peak at −0.83 V. The electrode process involves single electron transfer. Furthermore, a novel Pb(II) complex, [Pb(μ 2-dpmta)2(H2O)2] n (1), has been synthesized through self-assembly of Pb(OAc)2 with Hdpmta in aqueous solution and characterized by elemental analysis and IR spectra. X-ray diffraction analysis shows that 1 is a 1D chain structure consisting of two kinds of rhomboidal Pb2O2 rings, in which a large amount of H-bonding is involved. By π–π interactions parallel chains are further assembled to a 2D supramolecular network. The UV, TG and photoluminescence properties of 1 have also been investigated.
Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 20471053), the China National Key Basic Research Special Funds (No. 2003CB214500) and the Energy & Technology Program from Zhengzhou University.