Three new 2-D metal-organic frameworks containing 1-D metal chains bridged by N-benzesulfonyl-glutamic acid: Syntheses, crystal structures and properties

摘要

To explore the possibility of obtaining the metal-organic frameworks (MOFs) bearing the bsgluH(2) ligand, two new Cd(II) and one Cu(II) coordination polymers, [Cd(bsglu)(bipy)](n) (1), [Cd(bsglu)center dot(H2O)](n) (2) and {[Cu-2(bSghl)(2)(bipy)(2)]center dot 4H(2)O}(n) (3) (bsglu=N-benzesulfonyl-glutamic acid bianion, bipy = 2,2-bipyridine) were synthesized and characterized by IR, elemental analysis and X-ray diffraction analysis. Compounds I and 3 exhibit one-dimensional coordination chains, which are further connected to form two-dimensional supramolecular networks through pi-pi aromatic stacking interactions in a novel zipper-like way. Compound 2 presents a two-dimensional layer structure. To the best of our knowledge, 2 is the first two-dimensional complex formed from transition metal and bsgluH2 ligand. Interestingly, the bsglu anion exhibits remarkable versatile coordination modes in these complexes. Fluorescent analyses show that I exhibits photoluminescence in the solid state. Magnetic measurements for 3 revealed that the Cu(II) chain exhibit a weak antiferromagnetic behavior with a J value of -0.606 cm(-1). (c) 2007 Elsevier Inc. All rights reserved.