Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/ncomms11978
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Funding
- French Ministere des Affaires Etrangeres [30707NM, F-HKBU201/13]
- University Research Facility on Chemical and Environmental Analysis (URFCE) of PolyU
- HK Polytechnic University Area of Excellent Grants [1-ZVGG]
- Hong Kong Polytechnic University [RC-ICRS/15-16/02F-WKL02F-WKL]
- Hong Kong Baptist University [RC-ICRS/15-16/02F-WKL02F-WKL]
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Up conversion is an Anti-Stokes luminescent process by which photons of low energy are piled up to generate light at a higher energy. Here we show that the addition of fluoride anions to a D2O solution of a macrocyclic erbium complex leads to the formation of a supramolecular [(ErL)(2)F](+) assembly in which fluoride is sandwiched between two complexes, held together by the synergistic interactions of the Er-F-Er bridging bond, four intercomplex hydrogen bonds and two aromatic stacking interactions. Room temperature excitation into the Er absorption bands at 980 nm of a solution of the complex in D2O results in the observation of up converted emission at 525, 550 and 650 nm attributed to Er centred transitions via a two-step excitation. The up conversion signal is dramatically increased upon formation of the [(ErL)(2)F](+) dimer in the presence of 0.5 equivalents of fluoride anions.
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