Pd(II) porphyrins: Synthesis, singlet oxygen generation and photoassisted oxidation of aldehydes to carboxilic acids

[Display omitted] •Synthesis and optical studies of meso-substituted porphyrins and their Pd(II) complexes is reported.•Pd(II) porphyrins displayed decent phosphorescence ∼670 nm and generated singlet oxygen by type II pathway.•The catalytic application of Pd(II) porphyrins towards aerobic oxidation...

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Published in:Inorganica Chimica Acta 2020-03, Vol.502, p.119339, Article 119339
Main Authors: Pandey, Vijayalakshmi, Jain, Drishti, Pareek, Nitesh, Gupta, Iti
Format: Article
Language:English
Subjects:
Aldehydes
Carboxylic acids
Catalyst
Oxidation
Palladium porphyrins
Phosphorescence
Photosensitizer
Porphyrins
Singlet oxygen
Synthesis
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Summary:[Display omitted] •Synthesis and optical studies of meso-substituted porphyrins and their Pd(II) complexes is reported.•Pd(II) porphyrins displayed decent phosphorescence ∼670 nm and generated singlet oxygen by type II pathway.•The catalytic application of Pd(II) porphyrins towards aerobic oxidation of aromatic aldehydes is demonstrated. The synthesis and spectral studies of A3B and A2B2 type porphyrins and their Pd(II) complexes are reported. The meso-positions on porphyrin macrocycle are substituted with pentafluorophenyl and N-butylcarbazole or triphenylamine groups. Pd(II) porphyrins displayed decent phosphorescence ∼670 nm and are able to produce singlet oxygen by type II pathway, after photoirradiation. The calculated singlet oxygen quantum yields for Pd(II) porphyrins are (ΦΔ = 30%–63%). The catalytic application of Pd(II) porphyrins towards photoassisted aerobic oxidation of aromatic aldehydes to carboxylic acids is demonstrated.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2019.119339