Photo-dynamic and fluorescent zinc complex based on spiropyran ligand

Flávio B. Miguez, Thiago G. Menzonatto, Jorge Fernandes Z. Netto, Igor Maciel Souza Silva, Thiago Verano-Braga, Juliana Fedoce Lopes, Frederico B. De Sousa*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Spiropyrans are among a class of organic molecules widely studied as molecular photoswitches. A photochromic and solvatochromic spiropyran-containing Zinc (II) complex (ZnMC) was successfully synthesized and characterized, and its chromic properties were studied. A solid complex was isolated
through a precipitation process induced by UV radiation. The binding specificities were studied by FTIRATR spectroscopy and DFT calculations, demonstrating that phenolate and carboxylic acid are the binding sites of merocyanine. Mass spectrometry and computational methods revealed the possibility of two complexes with different geometries, tetrahedral and octahedral; the complex with tetrahedral characteristics proved to be more stable and abundant. ZnMC solvatochromic properties were analyzed,
presenting a wide variation in its absorption band in the visible region. We addressed the issue of ZnMC photodegradation in different solvents, and the observed absorbance did not vary after the first cycles for acetonitrile, while, in tetrahydrofuran, the absorbance decayed throughout the 48 cycles of switching between UV and visible light irradiation.
Original languageEnglish
Article number128105
JournalJournal of Molecular Structure
Number of pages8
Publication statusPublished - 5. Jul 2020
Externally publishedYes

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