Crystal structure of a two-dimensional metal-organic framework assembled from lithium(I) and ?-cyclo-dextrin.

ABSTRACT: The crystal structure of the polymeric title compound, catena-poly[[[di-aqua-lithium]-?-?-cyclo-dextrin(1-)-[aqua-lithium]-?-?-cyclo-dextrin(1-)] pentadecahydrate], {[Li2(C48H79O40)2(H2O)3]·15H2O} n , consists of deprotonated ?-cyclo-dextrin (CD) mol-ecules assembled by lithium ions into metal-organic ribbons that are cross-linked by multiple O-H?O hydrogen bonds into sheets extending parallel to (01). Within a ribbon, one Li+ ion is coordinated by one deprotonated hydroxyl group of the first ?-CD torus and by one hydroxyl group of the second ?-CD torus as well as by two water mol-ecules. The other Li+ ion is coordinated by one deprotonated hydroxyl and by one hydroxyl group of the second ?-CD torus, by one hydroxyl group of the first ?-CD torus as well as by one water mol-ecule. The coordination spheres of both Li+ cations are distorted tetra-hedral. The packing of the structure constitute channels along the a axis. Parts of the hy-droxy-methyl groups in cyclo-dextrin molecules as well as water mol-ecules show two-component disorder. Electron density associated with additional disordered solvent mol-ecules inside the cavities was removed with the SQUEEZE [Spek (2015 ?). Acta Cryst. C71, 9-18] routine in PLATON. These solvent mol-ecules are not considered in the given chemical formula and other crystal data. Five out of the sixteen hy-droxy-methyl groups and one water mol-ecule are disordered over two sets of sites.

SUBMITTER: Krukle-Berzina K 

PROVIDER: S-EPMC7057359 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature