Synthesis, crystal structures, and luminescent properties of three cluster-based heterometallic and monometallic compounds
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.
Publisher URL: https://link.springer.com/article/10.1007/s11243-017-0183-3
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