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The silicide Eu 2 Ru 3 Si 5  was synthesized from the elements in a sealed tantalum tube in a high-frequency furnace, while the gallide Eu 2 Ir 3 Ga 5  was obtained by arc-melting. Both structures were refined from single-crystal X-ray diffractometer data:  P 4/ mnc ,  a  = 1072.69(8),  c  = 569.55(5) pm,  wR  = 0.0453, 617  F  2  values, 31 variables for Eu 2 Ru 3 Si 5  and  a  = 1122.18(7),  c  = 583.17(4) pm,  wR  = 0.0546, 729  F  2  values, 31 variables for Eu 2 Ir 3 Ga 4.95(1) . The gallide shows small defects on one 8 h  site. The transition metal atoms in Eu 2 Ru 3 Si 5  and Eu 2 Ir 3 Ga 5  have octahedral  p  element coordination. These Ru@Si 6  respectively Ir@Ga 6  polyhedra are condensed to three-dimensional [Ru 3 Si 5 ] 6−  respectively [Ir 3 Ga 5 ] 4−  polyanionic networks. The ground states of Eu(III) in Eu 2 Ru 3 Si 5  and Eu(II) in Eu 2 Ir 3 Ga 5  were determined by  151 Eu Mössbauer spectroscopy.

Eu 2 Ru 3 Si 5 and Eu 2 Ir 3 Ga 5 – first europium compounds with U 2 Mn 3 Si 5 -type structure but different europium valence