Photofunctional hybrid based lanthanide functionalized metal-organic frameworks by ion exchange and coordination modification for luminescent sensing

In this paper, bio-MOF-1 (Zn-8(ad)(4)(BPDC)(6)O center dot 2Me(2)NH(2), ad = adeninate, BPDC = biphenyldicarboxylate) is modified to afford series of luminescent lanthanide hybrid material systems through both ion exchange of Ln(3+) (Ln = Eu, Sm, Nd and Yb), and coordination modification of HBN (6-hydroxybenz[de]anthracen-7-one) ligand. The resulted hybrids formulated as HBN-Ln-bio-MOF-1 show the characteristic luminescence to Ln3+ in both visible (for Eu3+, Sm3+) and near infra-red region (for Nd3+ and Yb3+), respectively. Furthermore, HBN-Eu-bio-MOF-1 is selected for sensing metal ions and small molecules. Interestingly, it shows highly sensitive sensing for both Fe3+ and Fe2+ ions, and especially for Feat, which can be expected to have potential application for recognizing iron ion species. Besides, it also shows the sensitive sensing for acetone molecules. The results are benefit for the further application of functionalized bio-MOFs in practical fields. (C) 2016 Elsevier B.V. All rights reserved.