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Published on: June 23, 2019
Peripheral arylation of subporphyrazines
Tomohiro Higashino1, M Salomé Rodríguez-Morgade, Atsuhiro Osuka
1Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
Synthesized hexaarylated subporphyrazines (SubPzs) exhibit tunable electronic properties influenced by aryl substituents. Electron-donating groups cause significant spectral shifts and altered reduction potentials in these novel macrocycles.
Area of Science:
- Organic Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Subporphyrazines (SubPzs) are macrocyclic compounds with unique electronic and photophysical properties.
- Peripheral substitution significantly impacts the characteristics of SubPz macrocycles.
- Understanding structure-property relationships is crucial for designing functional materials.
Purpose of the Study:
- To synthesize peripherally hexaarylated SubPzs with tunable electronic properties.
- To investigate the influence of aryl substituents on the optical and electrochemical behavior of SubPzs.
- To explore the solid-state self-assembly of these novel macrocyclic systems.
Main Methods:
- Palladium-catalyzed, copper(I) thiophene-2-carboxylate (CuTC)-mediated cross-coupling reactions.
- Synthesis of hexaethylsulfanylated subporphyrazine and subsequent arylation with arylboronic acids.
- Spectroscopic (UV-Vis) and electrochemical (cyclic voltammetry) analyses.
Main Results:
- Successfully prepared hexaarylated SubPzs with varying aryl substituents.
- Demonstrated that para-substituted electron-donating aryl groups cause significant redshifts in charge-transfer (CT) and Q-bands.
- Observed a correlation between reduction potentials and Hammett constants (σp) of the aryl substituents.
- Characterized the solid-state structure revealing dimeric capsules formed by self-assembly.
Conclusions:
- Peripheral arylation offers a versatile strategy for tuning SubPz electronic properties.
- The electronic effects of substituents are transmitted through the conjugated system, impacting spectral and redox behavior.
- The domed SubPz framework facilitates supramolecular assembly into dimeric structures.
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