Abstract
Three supramolecular isomers of lutetium metal organic framework {Lu-2(H2O)(4)(ATA)(3)center dot 4H(2)O} (Lu-ATA@RT); {Lu-2(H2O)(2)(C3H7NO)(2)(ATA)(3)}(n) (Lu-ATA@100), and {Lu-2(C3H7NO)(ATA)(3)}(n) (Lu-ATA@150), have been obtained from the reaction of Lu(NO3)(n). 6H(2)O with 2-aminoterephthalic acid (ATA) at different temperatures. The resulting structures of Lu-ATA metal-organic frameworks depend on the temperature applied during the synthesis, revealing a temperature susceptible supramolecular- isomerism. Single-crystal X-ray diffraction analyses suggest that new compounds with formula {Lu-2(S)(x)(ATA)(3)}(n) (S = solvent: H2O, DMF) display different three-dimensional architectures which consist of dinuclear lutetium building units. The supramolecular isomer Lu-ATA@RT, formed at room temperature, has a pcu-net topology, while its double interpenetrated analogue Lu-ATA@100 assembles at 100 degrees C under hydrothermal conditions. Hydrothermal synthesis at 150 degrees C affords formation of the dense Lu-ATA@150 cage-like framework displaying a new hexagonal-packed net topology. All Lu-ATA isomeric phases are porous and display different gas-uptake behavior toward carbon dioxide a function of polymeric network arrangement. The luminescent properties of Lu-ATA-frameworks in the solid state as well as in suspension in the presence of different solvents reveal a solvent-dependent emission.