Phthalocyanine Chemistry and Applications
Summary
Phthalocyanines are highly conjugated, planar macrocycles structurally analogous to porphyrins, distinguished by their intense visible absorption, exceptional thermal and photochemical stability, and versatile coordination chemistry. Introduction of central metal ions and peripheral substituents allows fine tuning of electronic, redox and photophysical properties, giving rise to applications that span organic electronics, photovoltaics, catalysis, sensing and biomedicine. In organic solar cells and photodetectors, phthalocyanines serve as light‐harvesting dyes and charge‐transport layers. Their strong Q‐band absorption in the red–near‐infrared region and robust oxidative stability underpin their use as photosensitisers in photodynamic therapy, where controlled generation of reactive oxygen species enables targeted destruction of malignant cells or pathogens. In environmental science, metallophthalocyanines catalyse oxidation and decolouration reactions of industrial effluents, while their aggregation behaviour and surface attachment chemistries have been exploited for chemical sensing and heterogeneous catalysis. Recent synthetic advances in peripheral functionalisation, nanocomposite assembly and supramolecular organisation have further broadened the scope of phthalocyanine materials, addressing challenges of solubility, processability and selectivity in real-world applications.
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Phthalocyanine Chemistry and Applications publication trend
The graph below shows the total number of articles in phthalocyanine chemistry and applications across all publications each year (not limited to Nature Index journals).
Technical terms
Phthalocyanine: A macrocyclic aromatic compound composed of four isoindole units linked by nitrogen atoms, capable of coordinating metal centres.
Q-band: The intense absorption band in the red–near-infrared region arising from π–π* transitions within the phthalocyanine ring.
Photosensitiser: A molecule that, upon light absorption, transfers energy to molecular oxygen or substrates to generate reactive species.
Reactive oxygen species (ROS): Chemically reactive molecules derived from oxygen, including singlet oxygen and hydroxyl radicals, which can mediate oxidation reactions.
Fluorescence quantum yield: The ratio of photons emitted to photons absorbed by a fluorescent molecule, indicating its emission efficiency.
References
- α- and β-Substituted Metal-Free Phthalocyanines: Synthesis, Photophysical and Electrochemical Properties. Molecules (2020).
- Synthesis, Spectroscopic Characterization and Photoactivity of Zr(IV) Phthalocyanines Functionalized with Aminobenzoic Acids and Their GO-Based Composites. C – Journal of Carbon Research (2019).
- Preparation of Phthalocyanine Immobilized Bacterial Cellulose Nanocomposites for Decoloration of Dye Wastewater: Key Role of Spacers. Applied Sciences (2018).
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