Hydrerad

Hydrerad is a term used in chemistry and materials science to denote a class of hydrated radical compounds or materials that integrate water molecules with radical centers in a solid or polymeric matrix. In practice, hydrerad systems are described as having radical sites stabilized by surrounding ligands, with water molecules occupying coordination or interstitial sites, creating a dynamic hydrogen-bond network that can mediate proton transfer.

Description and structure: Hydrerads are discussed in two common ways: as hydrated metal-hydride derivatives formed by controlled hydrolysis of metal-hydride precursors, and as organic-radical frameworks that incorporate lattice or bound water. The exact structure varies, but typical features include a central radical center, surrounding ligands or coordination environment, and water-derived protons and hydroxide species that participate in the network.

Properties: Hydrerads are typically redox-active and can undergo rapid proton-coupled electron transfer. Their electrical conductivity and stability depend on the hydration level and lattice rigidity. They can be sensitive to oxygen and humidity, which may alter radical stability or trigger decomposition.

Applications and status: In theoretical discussions and some speculative literature, hydrERads are proposed for energy storage, particularly as fast-charge electrolytes or cathode materials, and for catalytic transformations including water splitting or pollutant degradation. However, hydrERad remains an informal or non-standard term, lacking a single agreed-upon definition or widespread experimental consensus.

See also: hydride, radical, proton-coupled electron transfer, redox flow battery.