Investigations on the transformation of selenidostannates in ionic liquids were extended by using ternary P1-type cluster precursors [M4Sn4Se17](10)- [M = Mn (1), Zn (2), Cd (3)], which were synthesized for the first time as their Cs+ salts. Treatment of 1 with 1,2-diaminoethane (en) in [BMIm][BF4] yielded two-dimensional-layered [Mn(en)(2.5)(en-Me)(0.5)][Sn3Se7] (4; en-Me = H2NC2H4NHCH3). 1-4 were characterized by single-crystal X-ray diffraction and UV/visible spectroscopy.