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Abstract
Self-assembly of 4-aminoantipyrine (AAP) and 5-nitroisophthalic acid (H2NIP) with Co(CH3COO)2 or Cd(NO3)2 in CH3OH–H2O at room temperature generated {[Co2(AAP)(NIP)(H2O)8][Co(AAP)(NIP)2(H2O)2](H2O)4.5} (1) and {[Cd(AAP)(NIP)(H2O)](H2O)} n (2), which were further characterized by X-ray diffraction, IR spectra, elemental analysis and solid-state fluorescence spectra. The structure analysis indicates that 1 contains two individual fragments, one NIP-bridged six-coordinate binuclear CoII cation and a mononuclear CoII dianion. The binuclear units are connected into 1-D chains via O–H ··· O hydrogen bond interactions, which were further assembled into a 2-D supramolecular layer bridged by the mononuclear CoII unit. Complex 2 is a linear NIP bridged seven-coordinate CdII polymeric chain with the terminal AAP ligands as decorations, and are further extended into 2-D network by classic hydrogen bonds and π ··· π stacking interactions. Both solid complexes exhibit emission spectra from intraligand electron transfer at room temperature.
Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. 20571056), the National Fundamental Research Project of China (2005CCA01200) and Natural Science Foundation of Tianjin (No. 06YFJMJC03900), which are gratefully acknowledged.
