Triclinic polymorphs of tri­phenyl­phosphine and tri­phenyl­phosphine sulfide

New triclinic polymorphs of tri­phenyl­phosphine, (I), and tri­phenyl­phosphine sulfide, (II), were crystallized. For the structure of (I), it is obvious that the highest peaks in the final difference electron‐density map are located at the `lone‐pair regions' of P atoms. We have observed this effect in two further phosphorous‐containing structures.