Abstract
In this study, a series of compounds based on Dawson-type phosphomolybdates, H3(C6NO2H6)2[K(H2O)3(C6NO2H5)3][P2Mo18O62] ⋅ 5.5H2O (1), (C6NO2H6)6[Ln(H2O)7(C6NO2H5)2]2[P2Mo18O62]2·13.5H2O (Ln = Ce (2), La (3)) have been synthesized and characterized by elemental analysis, IR and UV-Vis spectroscopy methods, TG analysis, and single-crystal X-ray diffraction. Compound 1 consists of [P2Mo18O62]6− building units joined by potassium-pyridine-3-carboxylic acid complexes, resulting in a wavelike polyoxometalate (POM) chain, which further interacts with each other via intermolecular interactions to form a 3-D supramolecular channel framework containing guest water molecules. Compounds 2 and 3 possess a 3-D supramolecular framework with 1-D tunnel constructed from [P2Mo18O62]6− and mononuclear lanthanide coordination complex fragments. To the best of our knowledge, 1 not only represents the first example of 1-D hybrid assembly based on Dawson-type phosphomolybdate, but also the first hybrid compound constructed from Dawson-type POMs and alkali–metal coordination complex fragments.
Acknowledgments
The authors thank the National Natural Science Foundation of China (20901013), Specialized Research Fund for the Doctoral Program of Higher Education (200801411012), and Scientific Research Foundation for Doctor of Liaoning Province of China (20081092) for providing financial support.