LAUSR

Six new metal-organic frameworks based on magnesium(II) ions of various dimensionality were synthesized: chain-like [Mg(Hazdc)2(nmp)2] ( 1 , H 2 azdc is 4,4′-azobenzenedicarboxylic acid, nmp is N -methylpyrrolidone), layered [Mg(H2btc)(nmp)2] ( 2 , H 4 btc is 1,2,4,5-benzene-tetracarboxylic acid), [Mg3(sdc)3(def)4] •3DEF ( 3 , H2sdc is 4,4’-stilbenedicarboxylic acid, def or DEF is N , N -diethylformamide), [Mg3(azdc)3(dma)4] • 3DMA ( 4 , dma or DMA is N,N-di- methylacetamide), [Mg3(azdc)3(dmf)4] ( 5 , dmf is N , N -dimethylformamide), and doubly-interpenetrated three-dimensional [Mg3(azdc)3(nmp)4] •NMP ( 6 , NMP is N -methylpyrrolidone). According to the single-crystal X-ray dif raction data, compounds 1 and 2 are built from mononuclear carboxylate units {Mg(RCOOH)2(RCOO)2(nmp)2}. Compounds 3 - 6 are composed on trinuclear carboxylate units {Mg 3 (RCOO)6}. In isostructural compounds 3 - 5 , these units are linked to each other through carboxylate bridges to form polymer layers; in compound 6 , these units are linked together to form a doubly-interpenetrated three-dimensional metal-organic framework.