Europium-mercury amalgam reacts with diphenyl disulfide in THF to give a heterometallic product that crystallizes from pyridine (py) as [(py)(3)Eu(mu 2-SPh)(2)(mu(3)-Sph)Hg(SPh)](2) . 2py (1). Cluster 1 reacts with Cd in pyridine to give [(py)(3)Eu(mu(3)-SPh)Cd(SPh)Cd(SPh)]2 . 2py (2) and with Zn in THF to give [(THF)(3)Eu(mu(2)-SPh)2(mu 3-SPh)Zn(SPh)]2 . THF (3). All three compounds have been characterized by NMR, IR, and UV-visible spectroscopy and by single-crystal X-ray diffraction. The three are structurally related; 1 and 2 are isostructural tetrametallic clusters with mu(2) and mu(3) thiolate ligands connecting the 7-coordinate Eu(II) and tetrahedral group 12 metal ions. The lanthanide coordination sphere is saturated with three neutral pyridine donors, and the group 12 metal ion is bound to a terminal benzenethiolate ligand. The zinc cluster 3 has the same tetrametallic framework and connectivity as 1 and 2 but crystallizes in a different unit cell. The thermolysis products of these compounds have been established : 1 decomposes to give EuS, Ph(2)S, Hg, and S(2)Ph(2); 2 eliminates Ph(2)S to give a mixture of CdS and EuS; 3 eliminates Ph(2)S to give a mixture of EuS and ZnS Crystal data for 1-3 (Mo K alpha radiation, -100 degrees C) : 1, triclinic space group P (1) over bar, a = 13.954(3) Angstrom, b = 15.311(4) Angstrom, c = 19.666(8) Angstrom, a 84.54(3)degrees, beta = 86.40(3)degrees, gamma = 87.25(3)degrees, Z = 2; 2, triclinic space group P (1) over bar, a = 13.968(3) Angstrom, b = 15.387(6) Angstrom, c = 19.993(8) Angstrom, alpha = 84.74(3)degrees, beta = 86.21(3)degrees, gamma = 87.30(3)degrees, Z = 2; 3, monoclinic space group P2(1)/n, a = 13.920(5) Angstrom, b = 17.049(5) Angstrom, c = 17.823(6) Angstrom, beta = 103.7(3)degrees, Z = 4.