Three 3D Metal–Quinolone Complexes Based on Trimetallic or Rod-Shaped Secondary Building Units

The self-assembly of quinolones with metal salts in the presence of aromatic polycarboxylato ligands or chloride anions produced three novel 3D metal–quinolone coordination polymers, namely [Cu3(ppa)2(oba)2(H2O)4]·H2O (1), [Cd3(ppa)2(bpdc)2(H2O)2]·5H2O (2), and [Cd2(sara)2(μ2-Cl)2]·5H2O (3) [ppaH = pipemidic acid, saraH = sarafloxacin, oba = 4,4′-oxybis(benzoate), bpdc = 4,4′-biphenyldicarboxylate]. Their structures were determined by single-crystal X-ray diffraction analyses, and they were further characterized by elemental analyses, IR spectra, X-ray powder diffraction, and TG analyses. Compound 1 represents a novel 3D (3,4)-connected network with a (6·82)2(6·82)2(62·82·102) topology constructed from Cu atoms and ppa ligands. Compound 2 represents the first example of a 3D metal–quinolone complex with a (3,4,6)-connected (52·6)2(52·64)(54·66·72·8·92) topology. Compound 3 is an unprecedented 3D metal–quinolone complex constructed from Cl– ions connecting the {Cd(sara)}nn+ layers. Furthermore, the luminescent properties of compounds 2 and 3 are discussed.