New members of the family of highly luminescent 1,3-bis(4-phenylpyridin-2-yl)-4,6-difluorobenzene platinum( ii ) complexes: exploring the effect of substituents on the 4-phenylpyridine unit †

De Soricellis, Giulia; Carboni, Bertrand; Guerchais, Véronique; Williams, J. A. Gareth; Marinotto, Daniele; Colombo, Alessia; Dragonetti, Claudia; Fagnani, Francesco; Fantacci, Simona; Roberto, Dominique

Abstract

The synthesis and characterization of Pt{1,3-bis(4-phenylpyridin-2-yl)-4,6-difluorobenzene}Cl and Pt{1,3-bis(4-(4-methoxy-2,6-dimethylphenyl)-pyridin-2-yl)-4,6-difluorobenzene}Cl are reported, along with their molecular structure optimized by Density Functional Theory. These new NCN-coordinated Pt(ii) complexes are both very highly luminescent in deoxygenated solution in the blue region of the spectrum: λmax = 471–480 nm and Φlum = 0.89–0.98 at room temperature. Compared to the Pt{1,3-bis(pyridin-2-yl)-4,6-difluorobenzene}Cl analogue, the complex with a simple, unsubstituted phenyl ring at position 4 of the pyridinyl rings shows an improved luminescence quantum yield. However, a further enhancement is achieved with the 2,6-dimethyl-4-methoxyphenyl substituent, the steric hindrance of which inhibits the formation of bimolecular species, allowing high quantum yields to be maintained even in concentrated solutions (2 × 10−4 M).

Citation

De Soricellis, G., Carboni, B., Guerchais, V., Williams, J. A. G., Marinotto, D., Colombo, A., Dragonetti, C., Fagnani, F., Fantacci, S., & Roberto, D. (online). New members of the family of highly luminescent 1,3-bis(4-phenylpyridin-2-yl)-4,6-difluorobenzene platinum( ii ) complexes: exploring the effect of substituents on the 4-phenylpyridine unit †. Dalton Transactions, https://doi.org/10.1039/d5dt00682a

• Journal Article Type: Article
• Acceptance Date: May 26, 2025
• Online Publication Date: Jun 5, 2025
• Deposit Date: Jul 3, 2025
• Publicly Available Date: Jul 3, 2025
• Journal: Dalton Transactions
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1039/d5dt00682a
• Public URL: https://durham-repository.worktribe.com/output/4114554