Intricate 3D lanthanide-organic frameworks with mixed nodes nets

摘要

Three lanthanide-organic frameworks formulated as [Yb-2(1,3-pda)(3)(H2O)](n)center dot nH(2)O (1) [La-2(2,5-pydc)(3)(H2O)(2)](n) (2) and [La(2,5-pydc)(2,5-Hpydc)(H2O)(2)](n)center dot H2O (3) (H(2)1,3-pda = 1,3-phenylenediacetic acid, H(2)2,5-pydc = pyridine-2,5-dicarboxylic acid) have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. Both the frameworks of compounds 1 and 2 exhibit intricate 3D architectures which can be simplified as nets with mixed nodes. Compound 1 presents a very complicated net with five types of nodes comprising intersecting (3,4)-connected and CdSO4 nets. Compound 2 possesses a (4,4,6)-connected net with (4(2)8(4))(4(4)6(2))(2)(4(9)6(6))(2) circuit symbol. While compound 3 is a 2D layer based upon carboxyl-bridged La-III, chains. (C) 2008 Elsevier Inc. All rights reserved.