A Flexible Tri-carboxylic Acid Derived Zinc( II) 3D Helical Metal- OrganicFramework and a Cadmium( II) Interwoven 2D Layered Framework Solid

Starting from a flexible tri-carboxylic acid ligand H3L {H3L = 2,4,6-tris[(4-carboxyphenoxy)methyl]-1,3,5-trimethylbenzene}, a 3D metal-organic framework [Zn(HL)(H2O)](n) (1) and a 2D polymeric layered solid {[(CH3)(2)NH2)](2)[Cd2L2(DMA)(2)]}(n) (2) were hydrothermally synthesized. The complexes were characterized by elemental analyses, FT-IR spectroscopy, TGA, and single-crystal X-ray diffraction. The X-ray structural analyses reveal that the complex 1 is an example of a doubly interpenetrated 3D helical MOF with mutually entwined right- and left-handed helices to form an overall racemic framework. Complex 2 is made up of fourfold interwoven 2D nets in the solid state