Temperature-controlled spontaneous resolution of enantiomerically threefold interpenetrating arm-shaped MOFs with achiral symmetrical ligands.

Hydrothermal reaction of flexible 4,4′-oxybis(benzoic acid) (H 2 oba), semi-rigid 2,5-bis(4-pyridyl)-1,3,4-thiadiazole (bpt) and Cu(OH) 2 led to an interesting 2D → 3D polythreaded architecture of MOF [Cu 2 (bpt) 2 (oba) 2 (H 2 O)] n ·4nH 2 O ( 1 ). Accomplished with the rising synthesis temperature, two chiral MOFs [Cu 4 (bpt) 4 (oba) 4 ] n ( L - 2 and D - 2 ), have been obtained from the congenetic nonchiral precursors upon spontaneous resolution, which represent a rarely example of temperature-induced threefold interpenetrating enantiomerically arm-shaped MOFs constructed from achiral symmetrical ligands. [ABSTRACT FROM AUTHOR]