Oxygen-Unaffected Temperature Sensing in Air-Saturated Aqueous Dispersion with Oxygen-Sensitive Luminescent Metal Complexes Encapsulated in l‑Arginine-Type Silica Networks.
4 affiliations
- 1Federal Institute for Materials Research and Testing (BAM), Division 1.2 Biophotonics, Richard-Willstaetter-Str. 11, Berlin 12489, Germany.
- 2Free University Berlin, Institute for Chemistry and Biochemistry, Takustr. 3, Berlin 14195, Germany.
- 3Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, Mainz 55128, Germany.
- 4Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, Vienna 1090, Austria.
Abstract
Bioimaging, sensing, and photonic applications of oxygen-sensitive luminophores such as near-infrared (NIR) emissive spin-flip complexes of earth-abundant chromium (CrIII) and triplet metal-to-ligand charge transfer complexes like ruthenium (RuII), osmium (OsII) or iridium (IrIII) compounds in air require efficient strategies for their complete protection from luminescence quenching by oxygen (O₂). Here, we explored the applicability of our l-arginine-type sol-gel nanoparticle synthesis route developed for complete oxygen shielding of a molecular ruby-type luminophore [Cr-(ddpd)₂]-(BF₄)₃ (Crddpd) to a representatively chosen RuII complex [Ru-(phen)₃]-Cl₂ (Ruphen) and a RuII pyrene dyad [Ru-(phen)₂(phenpy)]-Cl₂ (Ruphenpy) with luminescence lifetimes of 1.1 μs and ∼50 μs in the absence of O₂, thus confirming its versatility. Temperature-dependent steady-state and time-resolved luminescence measurements with the RuII and CrIII complexes in air- and argon (Ar)-saturated aqueous solution and encapsulated in silica nanoparticles (SiO₂ NPs) prepared by the l-arginine and the classical Stöber method demonstrated the preserved temperature sensitivity of these luminophores in both silica networks. These measurements highlight the importance of complete O₂ protection for reliable temperature sensing with O₂-sensitive luminophores in air. These findings, together with the enhanced photostability observed for l-arginine SiO₂ NPs-encapsulated Ruphen and Ruphenpy, can pave the road for many applications of O₂-sensitive systems in air in the life and material sciences.
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BibTeX
@article{osipova2026oxygenunaffected,
title = {{Oxygen-Unaffected Temperature Sensing in Air-Saturated Aqueous Dispersion with Oxygen-Sensitive Luminescent Metal Complexes Encapsulated in l‑Arginine-Type Silica Networks.}},
author = {Viktoriia Osipova and Christian Homann and Arne C Weber and Lingcong Ge and Isabella Tavernaro and Elena Meßmer and Katja Heinze and Michael R Reithofer and Christoph Kerzig and Ute Resch-Genger},
journal = {ACS measurement science au},
year = {2026},
month = aug,
doi = {10.1021/acsmeasuresciau.6c00124},
url = {https://europepmc.org/article/MED/42921124},
note = {CC BY},
}
RIS
TY - JOUR
TI - Oxygen-Unaffected Temperature Sensing in Air-Saturated Aqueous Dispersion with Oxygen-Sensitive Luminescent Metal Complexes Encapsulated in l‑Arginine-Type Silica Networks.
AU - Viktoriia Osipova
AU - Christian Homann
AU - Arne C Weber
AU - Lingcong Ge
AU - Isabella Tavernaro
AU - Elena Meßmer
AU - Katja Heinze
AU - Michael R Reithofer
AU - Christoph Kerzig
AU - Ute Resch-Genger
PY - 2026
DA - 2026/08/10
JO - ACS measurement science au
DO - 10.1021/acsmeasuresciau.6c00124
UR - https://europepmc.org/article/MED/42921124
AB - Bioimaging, sensing, and photonic applications of oxygen-sensitive luminophores such as near-infrared (NIR) emissive spin-flip complexes of earth-abundant chromium (CrIII) and triplet metal-to-ligand charge transfer complexes like ruthenium (RuII), osmium (OsII) or iridium (IrIII) compounds in air require efficient strategies for their complete protection from luminescence quenching by oxygen (O₂). Here, we explored the applicability of our l-arginine-type sol-gel nanoparticle synthesis route developed for complete oxygen shielding of a molecular ruby-type luminophore [Cr-(ddpd)₂]-(BF₄)₃ (Crddpd) to a representatively chosen RuII complex [Ru-(phen)₃]-Cl₂ (Ruphen) and a RuII pyrene dyad [Ru-(phen)₂(phenpy)]-Cl₂ (Ruphenpy) with luminescence lifetimes of 1.1 μs and ∼50 μs in the absence of O₂, thus confirming its versatility. Temperature-dependent steady-state and time-resolved luminescence measurements with the RuII and CrIII complexes in air- and argon (Ar)-saturated aqueous solution and encapsulated in silica nanoparticles (SiO₂ NPs) prepared by the l-arginine and the classical Stöber method demonstrated the preserved temperature sensitivity of these luminophores in both silica networks. These measurements highlight the importance of complete O₂ protection for reliable temperature sensing with O₂-sensitive luminophores in air. These findings, together with the enhanced photostability observed for l-arginine SiO₂ NPs-encapsulated Ruphen and Ruphenpy, can pave the road for many applications of O₂-sensitive systems in air in the life and material sciences.
SN - 2694-250X
ER -