Temperature Tunable Optical Properties of Tetraheptylaluminum(III) Porphyrin Toward Molecular Thermometer

Stefan Charon, Niloofar Zarrabi, Jatan K. Sharma, Paul A. Karr, Francis D’Souza, Prashanth K. Poddutoori

Research output: Contribution to journalArticlepeer-review

Abstract

Amphiphilic aluminum(III) porphyrin (AlC7P) has been designed, and its aggregation-induced photophysics has been reported. The meso-positions of the aluminum(III) porphyrin are functionalized with a heptyl chain (C7), while the central porphyrin features an axial OH group on the Al center. The hydrophilic (.OH) and hydrophobic (C7) properties combined with the Lewis acid (Al center) and Lewis base (.OH group) functionality to facilitate the formation of aggregation through self-assembly. Spectroscopic studies indicate that aggregation can be modulated by solvent and temperature; it is more pronounced in long-chain hydrocarbon solvents, such as hexanes and n-heptane, and is favored at lower temperatures. At low temperature conditions, the aggregated molecules manifest low fluorescence yields, whereas at higher temperatures, the self-assembly breaks down to exhibit high fluorescence yields. This temperature-dependent aggregation-induced photophysical behavior observed in hexanes makes this porphyrin ideal for a luminescent molecular thermometer.

Original languageEnglish (US)
Article numbere202500087
JournalChemPhysChem
Volume26
Issue number13
DOIs
StatePublished - Jul 2 2025

Bibliographical note

Publisher Copyright:
© 2025 The Author(s). ChemPhysChem published by Wiley-VCH GmbH.

Keywords

  • aggregation
  • amphiphilic aluminum(III) porphyrin
  • molecular thermometer
  • self-assembly
  • thermochromism

PubMed: MeSH publication types

  • Journal Article

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