Abstract
A centrosymmetric dinuclear complex, [Pr(C8H14N4O2)(H2O)2(NO3)3]2 (I), was obtained from praseodymium(III) nitrate and the bicyclic bisurea 2,4,6,8-tetramethyl-2,4,6,8-tetraazabicy-clo[ 3.3.0]octane-3,7-dione (mebicar, Mc) and structurally characterized (CIF file CCDC no. 1435137). The crystals of complex I are triclinic: space group \(P\bar 1\), a = 9.8967(5), b = 10.3689(5), c = 11.0018(6) A, α = 74.650(5)°, β = 68.064(5)°, γ = 67.257(5)°, V = 956.22(10) A3, ρcalcd = 1.949 g/cm3, Z = 1. The praseodymium atom is coordinated to two O atoms of two Mc molecules (related by a center of symmetry), three bidentate nitrate anions, and two water molecules. So its coordination polyhedron has ten vertices; the Pr…Pr distance is 9.8726(7) A.
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