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, [Ln(2)(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, P2(1)/n, a = 13.362(4) Angstrom, b = 14.475(3) Angstrom, c = 13.568(2) Angstrom, beta = 104.058(9)0, V = 2545.7(10) Delta(3), Z = 4, mu = 4.642 mm(-1), D-calc = 2.163 g/cm(3), R-1 = 0.0237, wR(2) = 0.0587; 2, C24H16O14Eu2, Monoclinic, P2(1)/n, a = 13.316(4) Angstrom, b = 14.437(3) Angstrom, c = 13.540(2) Angstrom, 6 = 103.956(9)degrees, V = 2526.1(10) Angstrom(3), Z = 4, mu = 4.994 mm(-1), D-calc = 2.188 g/cm(3), R-1 = 0.0373, wR(2) = 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. (C) 2004 Elsevier B.V. All rights reserved.