Journal
JOURNAL OF LUMINESCENCE
Volume 205, Issue -, Pages 380-384Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.09.056
Keywords
MOFs; Metal clusters; Solvent effect; pH sensors
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Funding
- National Natural Science Foundation of China [21761010]
- Natural Science Foundation of Hainan Province [217018]
- Hainan University start-up fund [kyqd1654, KYQD(ZR)1806]
- Open Funds of the State Key Laboratory of Rare Earth Resource Utilization [RERU2018009]
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Two heteronuclear clusters-based MOFs, CoLi(HL)center dot 4DMA (HNU-23) and CoLi2(L)(DMF)2 center dot DMF center dot H2O (HNU-24) (H4L = 5- [bis(4-carboxybenzyl) amino] isophthalic acid) were successfully synthesized through a solvent-directed strategy. The luminescence sensing property investigations reveal that HNU-23 and HNU-24 exhibit turnon luminescence towards the H+ concentration under strong acidic condition, and could be served as potential pH sensors. HNU-23 shows high linear H+ concentration response in the range of 0.02-0.2 M; HNU-24 exhibits similar linear response towards the H+ concentration from 0.1 to 0.2 M. The mechanism of this sensing behavior can be explained through disruption of the HNU-23 and HNU-24 structures under acidic condition to gradually release the fluorophore.
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