Self-assembly of metal–organic frameworks: From packing helical channels to 2-fold interpenetration helical layers

Abstract

Two new 2D metal–organic frameworks were assembled in different conditions. Single X-ray diffraction analyses reveal that complex 1 possesses packing of large helical channels filled by guest water molecules; and 2 has a 2-fold interpenetration layer-like structure with relatively petite helical channels, with guest water molecules residing in the void spaces between neighboring helical layers. The diverse structures may result from dissimilar crystal growth mechanisms with distinct thermal stable energies confirmed by theoretical calculation. Photoluminescent spectra, thermogravimetric analyses and power X-ray diffraction analyses were performed.