Abstract
Organic-inorganic hybrid iodoplumbates [H2tmdp][PbI3]2∙DMF (1), [H2tmdp]2Pb7I18 (2), and [(H2tmdp)4(Hpyd)2(Me2NH2)][Pb6I22](I3)·2H2O (3) (tmdp = 4,4′-trimethylenedipiperidine, pyd = pyridine) were prepared using diammonium [H2tmdp]2+ as a structure directing agent under different conditions. The 1D [PbI3−]n polymeric anion in 1 is constructed by PbI6 octahedral units via face-sharing, while the 2D [Pb7I184−]n polymeric anion in 2 is composed of PbI6 units via both corner- and edge-sharing. The interconnection of PbI6 units via corner- and face-sharing generates a new iodoplumbate anion [Pb6I2210−]n in 3, featuring a waved layer structure. Compounds 1–3 exhibit steep band gaps at 2.32, 2.23, and 2.14 eV, respectively. Compounds 2 and 3 show photocatalytic activity in the degradation of methylene blue (MB) and rhodamine B (RhB) under visible light irradiation at room temperature. Compounds 1–3 are more effective in the photocatalytic degradation of MB than in the degradation of RhB.
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