Two new Pb coordination polymers derived from pyrimidine-2-thiolate: Synthesis, methyl substitution-induced effect and properties

• Two Pb pyrimidine-2-thione-based compounds have been isolated and characterized.
• The methyl substituent groups directed structural variations in compounds 1 and 2.
• Photoluminescence properties of compounds 1 and 2 have been studied.

Two new coordination compounds, {Pb(pymt)2}∞ (1) and {Pb(mpymt)2}∞ (2) (pymt = pyrimidine-2-thiolate and mpymt = 4-methyl-pyrimidine-2-thione) have been synthesized under solvothermal conditions and characterized by elemental analyses, IR spectroscopy, thermogravimetric analysis, powder X-ray diffraction and single-crystal X-ray diffraction. In compounds 1 and 2, pymt− and mpymt− adopt the same coordination modes (μ−1 κN, S and μ2−1 κN, S: 2 κS, N) to interacted with Pb2+, however, different topology structures for compounds 1 and 2 are obtained. Compound 1 displays a one-dimensional (1D) ribbon with square cavity constructed from two double concentric chains of [Pb-S]∞ and [Pb-Pyrimidine] ∞ sharing Pb1 ions. Compound 2 shows 1D polymeric single chain constructed by [Pb-S]∞ and [Pb-methyl-pyrimidine]∞ chains. The results revealed that the methyl groups don't influence the coordination modes of pyrimidine-2-thiolate but directed the structural variations. Moreover, the fluorescent properties of compounds 1 and 2 were investigated.

The substituent groups don't influence the coordination modes of pyrimidine-2-thiolate but directed the structural variations.Figure optionsDownload as PowerPoint slide