Omslutes

Omslutes are a family of crystalline solids defined by a modular open-framework lattice that can accommodate a variety of metal cations and chalcogenide or pnictide anions. This versatility yields a broad set of electronic, optical, and ionic properties, making omslutes of interest in energy storage, catalysis, and optoelectronics.

Structure and composition. Most omslutes feature a three-dimensional network built from transition-metal centers linked by chalcogenide ligands, creating porous or channel-like regions. By substituting different metals (such as nickel, cobalt, or iron) and different anions (sulfide, selenide, or telluride), researchers can tune stability, conductivity, and band structure. Layered variants also exist, with alternating sheets that can host ions.

Synthesis. Omslutes are typically prepared by solid-state synthesis, solvothermal, or hydrothermal routes, often under controlled temperatures and atmospheres. Post-synthetic modification and doping enable further tuning of properties, such as conductivity and catalytic activity. Scalability remains a challenge for certain compositions.

Properties and applications. They are valued for chemical stability and adjustable electronic properties, with potential uses in photovoltaic devices, photocatalysis, or as solid-state electrolytes. Some variants exhibit catalytic activity for gas-splitting reactions or CO2 reduction and may serve as platforms for ion transport.

Research status. As a relatively new class, omslutes are primarily studied in laboratories. Natural occurrence is unreported; most known examples are synthetically produced. Ongoing work focuses on understanding structure–property relationships, developing scalable synthesis, and identifying practical applications.