From hydrogen-bonded net-to-net framework to twofold interpenetrated (4,6) net: Effect of ligand topology on the supramolecular structural diversity
Journal
Crystal Growth and Design
Journal Volume
7
Journal Issue
2
Pages
300-306
Date Issued
2007
Author(s)
Abstract
Two novel metal-organic frameworks (MOFs) of Co(II), {[Co(bpdc)(bpdap)] ·1.5H2O}n (1) and [Co(bpdc)(Hpb)-(H 2O)]n (2) (bpdap = N,N′-bis(2-pyridyl)-2,6- diaminopyridine, H2bpdc = biphenyl-4,4′-dicarboxylic acid, and Hpb = 2-(2-pyridyl)-benzimidazole), have been synthesized by a hydrothermal method and structurally characterized. The structure determination reveals that both 1 and 2 crystallize in a triclinic system, space group P1̄. Complex 1 has a ID zigzag chain where Co(II) is bridged by bpdc in alternate bis(monodentate) and bis(chelate) manners and extends to form a 2D rectangular grid (RG) framework stacking in a staggered manner through hydrogen bonding and π-π interactions to form a net-to-net supramolecular network with a small channel along the c-axis, which accommodates the water molecules. In the case of 2, a zigzag chain with Co(II) connected by bis(monodentate) bpdc results in a 2D RG network based on hydrogen bonding, and every two networks interlock slantwise forming a twofold interpenetrated (4,6) net framework that is stabilized by C-H⋯π interactions. Magnetic measurement reveals that both 1 and 2 present weakly antiferromagnetic behavior. © 2007 American Chemical Society.
SDGs
Type
journal article