Synthesis,crystal structures,and luminescent properties of three cluster-based heterometallic and monometallic compounds |
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| Authors: | Ai-Qin Zhang Li-Long Liu |
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| Affiliation: | 1.Animal Husbandry, Pasture and Green Agriculture Institute, Institute of Agricultural Quality Standards and Testing Technology,Gansu Academy of Agricultural Sciences,Lanzhou,People’s Republic of China |
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| Abstract: | Two heterometallic cluster compounds and one monometallic cluster compound, namely [Ni9Co6(PMIDA)6(BTC)2(H2O)12]·6H2O (1), [Co13Zn2(PMIDA)6(H2O)18]·6NO3·15H2O (2), and [Fe15(PMIDA)6(BTC)2(H2O)22]·38H2O (3), have been obtained under hydrothermal conditions using N-(phosphonomethyl)imino-diacetic acid (H4PMIDA) and 1,3,5-benzenetricarboxylate acid (H3BTC) as ligands, and structurally characterized by X-ray crystallography. Compound 1 exhibits a 3D open framework constructed from [Ni9Co6(PMIDA)6(H2O)12]6+ heteronuclear clusters and BTC3? ligands. Compounds 2 and 3 are both zero-dimensional polynuclear clusters, further extended into 3D supramolecular structures via hydrogen-bonding interactions. However, there are some differences in their crystal structures; compound 2 features an isolated spherical heteronuclear cation cluster based on PMIDA4? ligands, such that the NO3 ? anions only balance the charge, whereas compound 3 is characterized as a neutral monometallic cluster incorporating two different types of organic acid ligands, namely PMIDA4? and BTC3?, and the two BTC3? ligands exhibit regular distribution in each cluster. The luminescence properties of all three compounds have been investigated at room temperature. |
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