Open layers based on metal-oxide chains linked by cyclohexanedicarboxylate ligands

摘要

Three layered metal-oxide organic compounds,In(OH)(1,4-chdc),(1),Cr(OH)(1,4-chdc),(2),and In(OH)(1.2-chdc),(3),(H_2chdc=cyclohexanedicarboxylic acid) were synthesized and characterized by thermogravimetric analysis,infrared spectroscopy,and X-ray diffraction.All three structures are formed by stacking electro-neutral layers in a simple AA sequence.The layers are built by cross-linking-OH-M-OH-M-chains with the chdc anions.Unlike the flat 1,4-benzenedicarboxylate ligand which was previously shown to connect similar metal-oxide chains into porous 3D frameworks,the bent chdc ligands link the chains to form open layers with narrow intra-layer channels.From a mixture of cis-and transconformations of 1,4-chdc,only the e.a-cis conformation is incorporated in 1 and 2.