NH42PtCl4

NH42PtCl4, more accurately represented as (NH4)2[PtCl4], is the ammonium tetrachloroplatinate(II) salt. This chemical compound consists of the ammonium cation (NH4+) and the tetrachloroplatinate(II) anion ([PtCl4]2-). In this complex anion, a platinum atom in the +2 oxidation state is coordinated to four chloride ligands in a square planar geometry. The compound typically appears as a yellow crystalline solid.

(NH4)2[PtCl4] is a common precursor in the synthesis of other platinum-containing compounds, particularly in organometallic chemistry and coordination chemistry. It is soluble in water and also in some polar organic solvents. Its preparation often involves the reaction of potassium tetrachloroplatinate(II) (K2[PtCl4]) with ammonium chloride. This salt is historically significant as it was one of the first platinum coordination compounds to be extensively studied, contributing to the early understanding of coordination complex structures and bonding theories, notably by Alfred Werner. Due to the presence of platinum, it is considered a valuable material, and its handling and disposal require appropriate safety measures.