Diphenylarsines

Diphenylarsines are organoarsenic compounds with the chemical formula (C6H5)2AsR, where R is a hydrogen atom or another group. They are characterized by the presence of two phenyl groups attached to an arsenic atom. The simplest member of this class is diphenylarsine itself, (C6H5)2AsH.

Diphenylarsines are typically colorless, air-sensitive liquids or low-melting solids. Their reactivity is dominated by the arsenic atom, which can act as a Lewis base or undergo oxidation. They are often prepared through reactions involving arsenic trichloride or phenylarsonic acid derivatives. For instance, the reduction of diphenylarsinic acid or diphenylchloroarsine can yield diphenylarsine.

These compounds can serve as ligands in coordination chemistry, forming complexes with various transition metals. The arsenic atom's lone pair of electrons allows it to donate to metal centers. Diphenylarsines have also been explored in organic synthesis as reagents or intermediates, though their use is often limited by toxicity and handling difficulties. The arsenic-carbon bond in diphenylarsines is relatively stable, but the compounds can be susceptible to reactions with electrophiles and oxidizing agents. Due to the toxicity associated with arsenic compounds, diphenylarsines require careful handling and disposal.