Synthesis and characterization of a nickel-organic framework encapsulating hetero-chiral helical water chains in the 1-D channels

摘要

A porous coordination polymer based on nickel(II) and rigid multitopic ligands, {[Ni(dpdapt)(BDC)(H_2O)] · 3.5H_2O}_n (1) (dpdapt = N, N'-di(2-pyridyl)-2,4-diamino-6-phenyl-1,3,5-triazine), has been synthesized and characterized. Compound 1 crystallizes in the space group C2/m and possesses a 3-D open framework with 1-D rhombic hydrophilic channels, in which hetero-chiral helical water chains are located. Two 1-D water chains are further stabilized by hydrogen-bonding interactions with the host, inducing a 10-oxygen ring propagated along the channel. TGA, PXRD analyses, and magnetic properties have also been studied.