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Reactivity of ZrO(MFP) and ZrO(RP) Nanoparticles with LnCl 3 for Solvatochromic Luminescence Modification and pH‐Dependent Optical Sensing
Author(s) -
Wehner Tobias,
Heck Joachim,
Feldmann Claus,
MüllerBuschbaum Klaus
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903744
Subject(s) - luminescence , chromaticity , nanoparticle , solvatochromism , chromophore , materials science , fluorescence , composite number , photochemistry , halide , chemistry , chemical engineering , inorganic chemistry , nanotechnology , organic chemistry , optics , optoelectronics , composite material , molecule , physics , engineering
The luminescence of the inorganic–organic hybrid nanoparticles ZrO(MFP) (MFP=methylfluorescein phosphate) and ZrO(RP) (RP=resorufin phosphate) was modified by addition of different rare earth halides LnCl 3 . The resulting composite materials form dispersible nanoparticles that exhibit modified nanoparticle fluorescence depending on the rare earth ion. The resulting chromaticity of the luminescence is further variable by the employment of different solvents for ZrO(MFP)‐based composite systems. The strong solvatochromic effect of the MFP chromophore leads to different luminescence chromaticities of the composite materials between green, yellow, and blue in THF, toluene, and dichloromethane, respectively. The luminescence of ZrO(RP)‐based composite particles can be modified between the red and blue spectral regions in dependence on the applied reaction temperature. Beside a luminescence shift that is derived from nanoparticle modification by LnCl 3 , a strong turn‐on effect of ZrO(RP) particles results after contact with different Brønsted acids and bases in combination with a respective chromaticity shift. Both effects enable the potential employment of such particles as highly sensitive optical pH sensors.