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Nanoscale lanthanide-containing metal-organic frameworks (MOFs) have more and more interest due to their great properties and potential applications, but how to construct them easily is still challenging. Here, we present a facile and rapid synthesis of Eu(III)-containing Nanoscale MOF (denoted as NMOF) under ultrasonic irradiation. The effect of the ratio and the addition order of metal ions and linkers on the morphology and size of MOFs was investigated. It is found that both of the ratio and the addition order can affect the morphology and size of 1.4-benzenedicarboxylic acid(H₂BDC) -based MOFs, but they show no evident influence on that of H₂aBDC-based MOFs. The former exhibit typical emission bands of Eu(III) ions, while the latter only show the photoluminescent properties of ligands.<p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.21.4.9695">http://dx.doi.org/10.5755/j01.ms.21.4.9695</a></p>