Electrochemical properties of Hdpmta and synthesis, crystal structure as well as characterizations of a new 1D lead complex [Pb(μ₂-dpmta)₂(H₂O)₂]_n

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.

Keywords:

• [(4,6-Dimethyl-2-pyrimidinyl)thio] acetic acid
• Electrochemistry
• Ion-selective electrode
• Crystal structure
• Photoluminescence property

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.