Hydrothermal synthesis, structures and spectroscopy of 2D lanthanide coordination polymers built from helical chains: [Ln2(BDC)3(H2O)2]n (Ln ¼ Sm, 1; Ln ¼ Eu, 2; BDC ¼ 1,3-benzenedicarboxylate)

This article presents two lanthanide coordination polymers, [Ln2(BDC)3(H2O)2]n (Ln ¼ Sm, 1; Ln¼ Eu, 2; BDC¼ 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 ¼ 13:362ð4Þ A ° , b ¼ 14:475ð3Þ A ° , c ¼ 13:568ð2Þ A ° , b ¼ 104:058ð9Þ8, V ¼ 2545:7ð10Þ A ° 3, Z ¼ 4; m ¼ 4:642 mm21, Dcalc ¼ 2:163 g/cm3, R1 ¼ 0:0237; wR2 ¼ 0:0587; 2, C24H16O14Eu2, Monoclinic, P21=n; a ¼ 13:316ð4Þ A ° , b ¼ 14:437ð3Þ A ° , c ¼ 13:540ð2Þ A ° , b ¼ 103:956ð9Þ8; V ¼ 2526:1ð10Þ A ° 3, Z ¼ 4; m ¼ 4:994 mm21, Dcalc ¼ 2:188 g/cm3, R1 ¼ 0:0373; wR2 ¼ 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. q 2004 Elsevier B.V. All rights reserved.