Evidence of Conglomerate with Partial Solid Solutions in Ethylammonium Chlocyphos

We established that ethylammonium chlocyphos also belongs to a family of conglomerate-forming systems composed of chlocyphos and alkyl amine. The pure enantiomer and racemic mixture exhibit very close X-ray powder diffraction patterns but with some peak shifts. This led to consider that ethylammonium chlocyphos could crystallize as a conglomerate but with partial solid solutions close to the pure enantiomer. The crystal structures of the pure ( S )- and ( R )-ethylammonium chlocyphos were solved using single-crystal data. The temperature–composition binary phase diagram between the two enantiomers of ethylammonium chlocyphos system was investigated to determine the limit of the solid solutions. This was confirmed by a Tammann plot related to the eutectic invariant characterizing the melting of the conglomerate. The limit of the composition range of the partial solid solutions was confirmed by X-ray powder diffraction measurements on different enantiomeric compositions.