Heterometal silver/copper(I) modulated thermochromism of two isostructural iodoplumbates

• Two isostructrual heterometallic iodoplumbates have been prepared.
• Single-crystal-X-ray diffraction data were collected at different temperatures.
• Spectroscopic characterization showed semiconducting and thermochromic properties.
• The difference of thermochromic properties for two compounds was studied.

Two isostructrual heterometallic iodoplumbates [Y(DMF)8]2n[Pb7M2I22]n [M=Cu(1), Ag(2)] have been prepared. Chargely balanced by [Y(DMF)8]3+, [Pb7M2I22]n6n− displays a 1D zigzag chain constructed from MI4 tetrahedron and Pb7I24 unit similar to a fragment of commonly observed (PbI3)nn− chain. Their band gaps (Eg) can be estimated as 2.66 and 2.72 eV, revealing potential semiconducting properties. Interestingly, thermochromism exhibits different response to the temperature for two compounds, which is verified by the diffuse-reflectance UV–visible spectra and crystallographic data at different temperatures. Moreover, this phenomenon is attributed to the difference of heterometal Ag and Cu(I).

Two isostructrual heterometallic iodoplumbates [Y(DMF)8]2n[Pb7M2I22]n [M=Cu(1),Ag(2)] have been prepared. [Pb7M2I22]n6n− displays a 1D zigzag chain constructed from MI4 tetrahedron and Pb7I24 unit similar to a fragment of commonly observed (PbI3)nn− chain. Interestingly, the thermochromism for two compounds exhibits different response to the temperature, which is attributed to the difference of heterometal Ag and Cu.Figure optionsDownload as PowerPoint slide