The crystal structure of the acetic acid adduct of the so far unknown samarium(III) acetate dihydrate was determined from single-crystal four-circle diffractometer data. It has the composition [Sm (CH3COO)3(H2O)2] CH3COOH containing {[Sm(CH3COO)3(H2O)2]}2 dimers and crystallizes in the trigonal system, R3̄̄̄̄, a = 2695.1(3), c = 1030.8(4) pm, Vm = 216.97(5) cm3/mol, R = 0.041, Rw = 0.030.
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