Five three/two-fold interpenetrating architectures from self-assembly of fluorene-2,7-dicarboxylic acid derivatives and d10 metals

Five new three/two-fold interpenetrated coordination polymers, namely, [Cd(mfda)(L-1)] (1), [Cd(efda)(L-1)] (2), [Zn-2(mfda)(2)(L-2)]center dot DMF center dot H2O (3), [Zn-2(efda)(2)(L-2)]center dot(DMF)(0.25), (4) and [Cd-2(mfda)(2)(L-2)(2)]center dot DMF center dot H2O (5) (H(2)mfda = 9,9-dimethylfluorene-2,7-dicarboxylic acid, H(2)efda = 9,9-diethylfluorene-2,7-dicarboxylic acid, L-1 = Methylene bis(3,5-dimethylpyrazole) and L-2 = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene), have been synthesized under solvent-thermal conditions with mixed ligands. Compounds 1 and 2 are isostructural and possess two-dimensional (6, 3) layered structures containing two kinds of rings. Three equivalent (6, 3) net interpenetrate in a parallel fashion to form an unprecedented mat-like 2D sheet. Compounds 3 and 4 are almost identical in structure and display threefold interpenetrating alpha-Po net structures. Compound 5 displays a twofold interpenetrated 3D 6-connected net with alpha-Po topology. The luminescent properties of these compounds have been studied in the solid state at room temperature.