Abstract
A hydrothermal reaction of a mixture of Gd(NO 3) 3, 1,2-benzenedicarboxylic acid (1,2-BDC), piperazine, NaOH and water at 180 °C for three days under autogeneous pressure gave rise to a new compound of the formula [C 4N 2H 12][Gd 2(H 2O) 2(C 6H 4(COO) 2) 2] ( I). The connectivity between GdO 8 distorted dodecahedra and 1,2-BDC units gives rise to a two-dimensional structure with large apertures. The fully protonated piperazine molecule occupies the middle of these apertures. The compound has favorable CH⋯π interactions between the benzene rings of adjacent layers and shows photoluminescence at room temperature. Crystal data: monoclinic, space group = P2 1/ c (No. 14), a = 13.1671(3) Å, b = 13.7336(3) Å, c = 11.3100(1) Å, β = 115.411(1)°, v = 1847.34(6) Å 3, Z = 4, R 1 = 0.0238 for 2658 reflections [ I > 2 σ( I)].
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