In this article, we report on attempts to prepare binary RbTl by high-temperature synthesis as well as low-temperature approaches in liquid ammonia. Additionally, RbTl is approximated in ternary approaches of mixed alkali metals A1-xRbxTl (A=K or Cs). The homogeneity range of K1-xRbxTl is discussed, and two new monoclinic compounds Cs1-xRbxTl (x=0.18, 0.42) are presented.