LAUSR

Abstract We report X-ray crystallographic investigations of two novel metal–organic frameworks (MOFs) by using 4,4′,4′'-s-triazine-2,4,6-triyltribenzoic acid [H3TATB] ligand with Ca metal for 1 and 1,3,5 benzene tri-carboxylic acid [H3BTC] ligand with Co metal for 2 respectively. The compound [Ca6(TATB)4(H2O)(DMA)4] (1); (where DMA = dimethylacetamide); was successfully synthesized in a sealed tube at 110 °C for 72 h and shows the formation of a 3D network with embedded 1D channels which are occupied by solvent molecules. The structure of the compound 1 is relatively new and its structural differences with the reported Cu-TATB compounds are noteworthy. The compound Co-HKUST (2) was synthesized by solvothermal method at 140 °C for 72 h. Paddlewheel secondary building units are used to construct Co-HKUST (2) which is isostructural analogue of HKUST-1 enriching the series which consists of Cr, Fe, Ni, Zn, Mo, and Ru analogues. Both 1 and 2 are metastable MOFs characterized by complementary techniques namely powder X-ray diffraction and FTIR analysis.