Issue 19, 2014

Construction of three pH-dependent luminescent metal–organic frameworks with 3-(4-carboxyphen-yl)-1,3-benzoimidazole

Abstract

Three luminescent metal–organic frameworks (MOFs) with 3-(4-carboxyphenyl)-1,3-benzoimidazole (HCPBm), named [Er(CPBm)3]n (1), [Zn(CPBm)2]n (2) and {Zn[Er(CPBm)(OH)(H2O)4]4·(ClO4)4·Cl2}n (3), have been synthesized using zinc(II) chloride, erbium(III) perchlorate and the ligand HCPBm under different pH conditions. Complex 1 obtained at pH = 5.5 exhibits a 1-D chain structure based on Er(III). At pH = 7.0, a 2-D Zn(II)-based layer 2 forms. The reaction at pH = 8.5 leads to a 2-D heteronuclear square grid layer 3 with a rare stacking fashion of ⋯ABCD⋯ in a 3-D supramolecular network. Compound 1 shows typical lanthanide Er(III) near-infrared emission, and compound 2 has strong fluorescent emission based on the ligand HCPBm. However, compound 3 presents sensitized near-infrared emission (λmax = 1500 nm) upon excitation of the Zn(II) unit in the visible region (400 nm) due to efficient energy transfer from the Zn(II) ion to the Er(III) units.

Graphical abstract: Construction of three pH-dependent luminescent metal–organic frameworks with 3-(4-carboxyphen-yl)-1,3-benzoimidazole

Supplementary files

Article information

Article type
Paper
Submitted
17 Jan 2014
Accepted
05 Feb 2014
First published
06 Feb 2014

CrystEngComm, 2014,16, 3883-3889

Construction of three pH-dependent luminescent metal–organic frameworks with 3-(4-carboxyphen-yl)-1,3-benzoimidazole

T. Li, X. Hong, X. Liu, R. Chen, Q. Zhan, X. Xu and Y. Cai, CrystEngComm, 2014, 16, 3883 DOI: 10.1039/C4CE00125G

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