Preparation and crystal structures of two new modifications of mercury(II) selenite(IV), HgSeO3, and the mixed-valent mercury(II) selenite(IV) selenide(−II), (HgSeO3)3HgSe

Hg3Se(SeO3)(SO4): A Mixed-Valent Selenium Compound with Mid-Infrared Transmittance Obtained by In Situ Reaction

“…The Hg–O and Hg–Se bond lengths are in the ranges of 2.127(9)–2.599(12) and 2.450(13)–2.473(14) Å, respectively. These bond lengths are similar to the Hg–O bonds (2.132(5)–2.863(5) Å) and Hg–Se bonds (2.4654(7)–2.4841(7) Å) in compound (HgSeO 3 ) 3 (HgSe) reported in 2002 . Se(1) forms a trigonal pyramid coordination with three O atoms, and the Se–O bond distances are between 1.684(10) and 1.700(9) Å.…”

“…Only two mixed-valent selenium compounds containing Se 4+ and Se 2− were reported in the literatures, namely, (HgSeO 3 ) 3 (HgSe) 45 and (Hg 3 Se 2 )(Se 2 O 5 ). 44 features a 2D structure composed of 1D (Hg 3 Se 2 ) 2+ cationic chains bridged by the Se 2 O 5 anionic groups.…”

Hydrothermal Studies in the System Hg/Se/Te/O: The First TeIV/SeVI Oxocompounds Hg3SeTe2O10 and Hg3SeTe4O14, and the Mixed‐valent Hg5Se2O8

“…Since for each element such redox equilibria are not only influenced by concentration, temperature, pressure, filling degree, pH value etc., but in particular by the presence of other redox partners, the hydrothermal reaction process is very difficult to predict or even impossible to reproduce because of the large numbers of adjustable and interacting reaction parameters. Therefore the occurrence of multi‐component solid reaction products including mixed‐valent phases is not uncommon for the reaction of mercury with oxochalcogenates under hydrothermal conditions 19,29,30. A recent compilation of mixed‐valent mercury oxycompounds known up to date is given in the literature 31…”

“…Therefore the occurrence of multi-component solid reaction products including mixed-valent phases is not uncommon for the reaction of mercury with oxochalcogenates under hydrothermal conditions. [19,29,30] A recent compilation of mixed-va-lent mercury oxycompounds known up to date is given in the literature. [31] Such complex interplays of different redox equilibria apparently occurred also in the present case.…”

Synthesis, crystal and band structures, and optical properties of a new mixed-framework mercury selenide diselenite, (Hg3Se2)(Se2O5)

“…7,9,10 However, there is no compound with a mixed-framework containing both chalcogenide and oxochalcogenide anions except for the compound (HgSeO 3 ) 3 HgSe. 11 Recently, we have begun a systematic investigation of mixedframework compounds composed of pnictide-based mixed-anions to explore new semiconducting materials. 12 In the present work, in order to obtain a new class of mixed-framework compounds, we have chosen to incorporate the Hg 2+ cation with chalcogenide and oxochalcogenide anions because mercury chalcogenides and mercury oxochalcogenides show good chemical and physical properties.…”