A Three-Dimensional Framework with Accessible Nanopores: RbCuSb2Se4⋅H2O

Abstract

Semiconductor properties are exhibited by the hydrothermally synthesized title compound, whose channels are occupied by Rb ions and water molecules. In topotactic reactions the exchange of the Rb ions for smaller alkali metal ions demonstrates the high mobility of the cations and may determine other interesting properties.

Transformation of K2Sb8Q13 and KSb5Q8 Bulk Crystals to Sb2Q3 (Q = S, Se) Nanofibers by Acid–Base Solution Chemistry

“…Chalcogenide compounds with discrete molecular structures often dissolve in appropriate polar solvents and can be used as templates to build more complex structures like open frameworks. − However, there has been little research on manipulating infinitely extended structures at lower temperatures, aside from basic techniques like ion exchange and intercalation/deintercalation, despite the fact that chalcogenides have a rich structural chemistry and are capable of forming Q–Q bonds (where Q represents chalcogen atoms). Notable examples are the transformation of A 2 Bi 4 Se 7 (A = Rb, Cs) and Cs 3 Bi 7 Se 12 . , The former undergoes conversion involving the topotactic oxidative coupling of entire rows of terminal Se 2– ions to give Se 2 2– groups with the expulsion of alkali ions from the crystals upon exposure to ambient air.…”

Unique Pore Selectivity for Cs+ and Exceptionally High NH4+ Exchange Capacity of the Chalcogenide Material K6Sn[Zn4Sn4S17]

“…The huge diversity in structure and pore size of zeolites is not yet reflected in chalcogenide compounds. , Because of the wider chemical and bonding flexibility, however, the chalcogenides can be more diverse in composition and structure than the zeolites. Indeed, research on chalcogenides in the past decade resulted in isolation of several remarkable open framework compounds with unique structural types. − Chalcogenides with anionic open frameworks and loosely bound extra framework cations could thus constitute a new class of inorganic ion exchangers with unique exchange properties arising not only from their diversity in pore and channel size but also from the specific affinity of the non-oxidic framework for certain cationic species. In addition, crystalline open framework chalcogenides can offer themselves as suitable models for understanding the mechanism of various ion-exchange processes on the basis of their structure, which is accurately determined (in most cases) by single-crystal X-ray crystallography.…”

“…Reports concerning the ion-exchange properties of open framework chalcogenides remain a few. 3f, We recently described the open framework sulfide K 6 Sn[Zn 4 Sn 4 S 17 ] ( 1 ) 7aa,b.…”

K2Ag3CeTe4: A Semiconducting Tunnel Framework Made from the Covalent “Link-Up” of [Ag2CeTe4]3- Layers with Ag

“…Solid-state ion-exchange reactions were performed in which the material was pressed with a 50-fold excess of NaI and heated at 100 °C for 5 days . The product was isolated by washing away the iodide matrix with methanol.…”