Molecular thermometers based on phosphorescent porphin metal complexes

We study the temperature dependence of the radiative deactivation of triplet states of Pdand Pt-porphin molecules in n -alkane matrices in the temperature range 4.2–210 K. The nature of the thermally activated “hot” lines that are observed in phosphorescence spectra of Pdand Pt-porphin is discussed...

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Bibliographic Details
Published inOptics and spectroscopy Vol. 111; no. 5; pp. 743 - 749
Main Authors Kruk, M. M., Starukhin, A. S.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.11.2011
Subjects
Functional Materials for Quantum Technologies
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Phosphorescence Spectrum
Triplet State
Delay Fluo Rescence
Porphin
Phosphore
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Summary:We study the temperature dependence of the radiative deactivation of triplet states of Pdand Pt-porphin molecules in n -alkane matrices in the temperature range 4.2–210 K. The nature of the thermally activated “hot” lines that are observed in phosphorescence spectra of Pdand Pt-porphin is discussed in detail. We show that, because of the degeneracy lifting of the triplet state T 1, 2 in the crystal field of n -alkane matrices, lines of the transitions T 1 → S 0 and T 2 → S 0 are spectrally spaced and, in all cases, the T 2 state is the first state that is activated with increasing temperature. We analyze the dependences of the T 2 - T 1 splitting on the chelated metal ion and the type of the matrix. The possibility of measuring cryogenic temperatures with molecular thermometers that use the thermochromic properties of Pdand Pt-porphin in n -alkane matrices is discussed.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X11120150