Advancements in framework materials for enhanced energy harvesting.

Energy harvesting, the process of capturing ambient energy from various sources and converting it into usable electrical power, has attracted a lot of attention due to its potential to provide long-term and self-sufficient energy solutions. This comprehensive review thoroughly explores the use of metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) for energy harvesting by piezoelectric and triboelectric nanogenerators (PENGs and TENGs). It begins by classifying and outlining the structural diversity of MOFs and COFs, which is key to understanding their importance in energy applications.

Understanding the motional dynamics of the ammonium ion in the mechanism of multiferroicity of Cr(V) peroxychromates: a H NMR study.

Cr(5+)-based peroxychromates, MCr(O), with M = NH or a mixed NH-alkali metal are a new class of multiferroics for potential use in molecular memory devices, with the NH being a key element, but the underlying chemical mechanism is not fully understood. The NH ion occupies two different sites, but their specific roles are not known. We thus performed detailed H NMR spin-relaxation () measurements on (NH)Cr(O) over a wide temperature range (120-300 K) to probe the displacive as well as hindered rotational dynamics of the NH ions with the view of understanding their specific roles in the phase transitions.