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The Syntheses, Crystal Structure, and Exceptional Chemical Stability of Three Multinuclear PbII Complexes



Three multinuclear PbII complexes―[Pb2(ptptp)2(H2O)2] (1), [Pb2(p-PDA)(Hptptp)2] (2), and [Pb4(o-PDA)2(ptptp)2]·2H2O (3) [H2ptptp = 2-(5-{6-[5-(pyrazin-2-yl)-1H-1,2,4-triazol-3-yl]pyridin-2-yl}-1H-1,2,4-triazol-3-yl)pyrazine, H2PDA = phenylenediacetic acid]―have been synthesized under hydrothermal conditions. Complexes 1, 2, and 3 show di-, di-, and tetranuclear structures, respectively. The study of the chemical stability of the three complexes demonstrates their remarkable chemical resistance to boiling water and organic solvents. More importantly, complex 1 shows remarkable acid and alkali resistance, which is outstanding among metal–organic solids. The thermogravimetric analysis curve shows that complex 1 possesses high thermal stability (up to 491 °C). Furthermore, the fluorescence of complexes 1, 2, and 3 has also been investigated.