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The intermetallic phases Sr 2 Pt 2 Mg and Eu 2 Pt 2 Mg were obtained by reaction of the elements in sealed tantalum tubes at high temperature. Sr 2 Pt 2 Mg crystallizes with the monoclinic Ca 2 Ir 2 Si type ( C 2/ c ,  a  = 1020.7(7),  b  = 597.7(4),  c  = 827.0(4) pm,  β  = 103.37(5)°), while Eu 2 Pt 2 Mg adopts the orthorhombic W 2 CoB 2 -type structure ( Immm ,  a  = 440.31(5),  b  = 582.20(6),  c  = 914.11(9) pm,  wR  = 0.0359, 277  F  2  values, 14 variables). The magnesium atoms in both structures are coordinated by four Pt 2  dumb-bells with a rectangular planar coordination in Eu 2 Pt 2 Mg (268 pm Pt–Mg) and a distorted tetrahedral one in Sr 2 Pt 2 Mg (273–275 pm Pt–Mg). The Pt–Pt distances are 277 pm in the europium and 269 pm in the strontium compound. The polyanionic [Pt 2 Mg] units are planar in Eu 2 Pt 2 Mg and separated by the europium atoms. The Sr 2 Pt 2 Mg structure shows the motif of hexagonal rod packing for the [Pt 2 Mg] rows that are embedded in a strontium matrix. Chemical bonding and the influence of the valence electron count on the formation of the structure types are discussed.

Magnesium intermetallics: synthesis and structure of Eu 2 Pt 2 Mg and Sr 2 Pt 2 Mg