Helicity controlled by the chirality of amino acid: two novel enantiopure chiral 3D architectures containing fivefold interwoven helices

• DOI: 10.1039/c2ce25038a
• Publication Date: 2012-02-28T14:03:42Z
• Authors: Jianghong He; Guangju Zhang; Dongrong Xiao; Haiyan Chen; Shiwei Yan; Xin Wang; Juan Yang; Enbo Wang
• Keywords: Chirality; Enantiopure drug; Thermogravimetric analysis; Helix (gastropod)

Two novel three-dimensional (3D) chiral coordination polymers, namely [Zn4(btc)2(Hbtc)(L-His)2(H2O)4]·1.5H2O (L-1) and [Zn4(btc)2(Hbtc)(D-His)2(H2O)4]·1.5H2O (D-1), have been assembled from zinc salt with mixed ligands 1,3,5-benzenetricarboxylic acid (H3btc) histidine (His). Their structures were determined by single-crystal X-ray diffraction analyses, elemental infrared (IR) spectra, powder diffraction, circular dichroism (CD) thermogravimetric (TG) analysis. Compounds L-1 D-1 are enantiomers exhibit unique 3D frameworks containing fivefold interwoven helices, which represent the first examples of metal–amino complexes n-fold helices. Furthermore, helices in left-handed, while those right-handed, indicate that handedness can be controlled chirality His bound to metal. More wonderfully, framework simplified a (3,4)-connected net an unprecedented (4·92)(4·94·11) topology. Moreover, luminescent properties compound discussed.