A series of CdII, CoII, NiII, and PbII mixed-ligand coordination complexes 1−8 based on 5-sulfoisophthalic acid (H3sip) and the bent dipyridyl ligand 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo) or its 4-pyridyl N-donor analogue (4-bpo) have been synthesized and fully characterized by IR spectra, microanalyses, and single crystal and powder X-ray diffraction techniques. The significant pH effect on assembly of the CdII complexes 1−4 has been demonstrated, which leads to the formation of distinct crystalline products, whereas the CoII, NiII, and PbII systems 5−8 are independent to pH condition of the synthetic reaction. Complexes 1−8 display various coordination motifs with different existing forms, conformations, and coordination modes of the organic ligands. Further, extended supramolecular networks are constructed via secondary interactions such as hydrogen-bonding and aromatic stacking. Solid-state properties of thermal stability and fluorescence for these crystalline materials are also presented.
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Li et al. (2010) studied this question.