The metallothermic reduction of praseodymium tribromide, PrBr3, with lithium metal (molar ratio 1:1) in sealed tantalum containers at 850°C yields bronze lustrous rods of Pr2Br5. The crystal structure (monoclinic, P21/m, Z = 2, a = 774.38(4), b = 415.33(3), c = 1327.06(9) pm, β = 90.816(6)°, Vm = 128.52(2) cm3 mol−1) contains seven‐ and eight‐coordinate trivalent praseodymium in mono‐ and bicapped trigonal prisms. Pr2Br5 should therefore be formulated as (Pr3+)2(Br−)5(e−). It is isostructural with Pr2I5 and is believed to be identical with PrBr2,38 reported for the Pr/PrBr3 system.
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Schleid et al. (1987) studied this question.
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