Hydrothermal synthesis, structures and spectroscopy of 2D lanthanide coordination polymers built from helical chains: [Ln2(BDC)3(H2O)2]n (Ln=Sm, 1; Ln=Eu, 2; BDC=1,3-benzenedicarboxylate)

This article presents two lanthanide coordination polymers, [Ln2(BDC)3(H2O)2]n (Ln=Sm, 1; Ln=Eu, 2; BDC=1,3-benzenedicarboxylate) prepared by the hydrothermal technique, in the presence of 3,5-lutidine. The two complexes are characterized by IR spectra and X-ray diffraction. The luminescent spectroscopy of complex 2 has also been investigated. Crystal data: 1, C24H16O14Sm2, Monoclinic, P21/n, a=13.362(4) Å, b=14.475(3) Å, c=13.568(2) Å, β=104.058(9)°, V=2545.7(10) Å3, Z=4, μ=4.642 mm−1, Dcalc=2.163 g/cm3, R1=0.0237, wR2=0.0587; 2, C24H16O14Eu2, Monoclinic, P21/n, a=13.316(4) Å, b=14.437(3) Å, c=13.540(2) Å, β=103.956(9)°, V=2526.1(10) Å3, Z=4, μ=4.994 mm−1, Dcalc=2.188 g/cm3, R1=0.0373, wR2=0.1184. In these structures, Ln ions connecting with BDC anions are distributed in a helix-like 2D network, which is interlinked together by carboxylic groups.