Assembling Polyiodides and Iodobismuthates Using a Template Effect of a Cyclic Diammonium Cation and Formation of a Low-Gap Hybrid Iodobismuthate with High Thermal Stabilityстатья
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Дата последнего поиска статьи во внешних источниках: 7 октября 2020 г.
Аннотация:Exploiting a template effect of 1,4‐diazacycloheptane (also known as homopiperazine,Hpipe), four new hybrid iodides, (HpipeH2)2Bi2I10.2H2O, (HpipeH2)I(I3), (HpipeH2)3I6.H2O, and(HpipeH2)3(H3O)I7, were prepared and their crystal structures were solved using single crystal Xray diffraction data. All four solid‐state crystal structures feature the HpipeH22+ cation alternating with Bi2I104–, I3–, or I– anions and solvent water or H3O+ cation. HpipeH22+ assembles anionic and neutral building blocks into polymer structures by forming four strong (N)...I and (N)H...O hydrogen bonds per cation, with the H...I distances ranging from 2.44 to 2.93 Å and H...O distances of 1.88–1.89 Å. These hydrogen bonds strongly affect the properties of compounds; in particular, in the case of (HpipeH2)2Bi2I10.2H2O, they ensure narrowing of the band gap down to 1.8 eV and provide high thermal stability up to 240 °C, remarkable for a hydrated molecular solid.