Synthesis of homochiral helical metal-organic frameworks based on lactate derivatives

A pair of homochiral metal-organic frameworks (HMOFs) based on semi-rigid 5-(1-carboxyethoxy)isophthalic acid (H(3)CIA), [Zn-5((R)-CIA)(3)(OH)(2)(H2O)(4)]center dot NH2(CH3)(2)4.5H(2)O (1-D) and [Zn-5((S)-CIA)(3)(OH)(2)(H2O)(4)]center dot NH2(CH3)(2 center dot)4.5H(2)O (1-L), were synthesized and structurally characterized. They are enantiomers and exhibit 3-D framework structures. In each structure, the CIA ligands link the Zn centers into a homochiral open framework with tetranuclear and trinuclear Zn-clusters. An interesting double helix built from the connectivity between CIA ligands and Zn centers is presented. The chiral nature of 1-D and 1-L was further confirmed by CD spectra. Photoluminescence of 1-D was also investigated in the solid state at room temperature. [GRAPHICS] .