“…Several crystal structures of salts of picric acid with organic or metallic cations have been reported in recent years. The structures of the isomorphous anhydrous NH~-and K ÷ salts • (Maartmann-Moe, 1969;Palenik, 1972) and the monohydrated Li ÷ salt (Griffin & Coppens, 1973) are known. An article which describes the crystal structure of the red modification of T.1 ~ picrate (Herbstein, Kapon & Wielinski, 1977) also reports that Rb, Cs and red T1 ~ picrates are isomorphous and different from the isomorphous NH4 and K picrates.…”