Cyclometallated Platinum(II) Complexes Featuring an Unusual, C^N‐Coordinating Pyridyl‐pyridylidene Ligand and L X Coligands: Synthesis, Structures and Dual Luminescence Behavior

Montagu, Julien; Gontard, Geoffrey; Williams, J. A. Gareth; Moussa, Jamal

Abstract

Thanks to an unusual protodemethylation reaction, a series of luminescent cyclometallated platinum(II) complexes can be prepared, which incorporate a rare NC-chelating, pyridyl-pyridylidene ligand, in combination with OO-coordinating acetylacetonate (acac) or NO-coordinating 2-picolinate (pic) or 8-hydroxyquinolate. The acac and pic complexes show unusual dual emission in a frozen glass.

A series of cyclometallated platinum(II) complexes incorporating a rare, N^C-chelating, pyridyl-pyridylidene ligand are described, in which the coordination sphere is completed by two chlorides or an L X co-ligand, namely O O-coordinating acetylacetonate (acac), or N^O-coordinating 2-picolinate (pic) or 8-hydroxyquinolinate. The acac and pic complexes have been structurally characterized in the solid state by single-crystal X-ray diffraction. These two complexes display red phosphorescence in the solid state at room temperature. In a frozen glass at 77 K, all four complexes show two broad emission bands that span much of the visible spectrum, apparently from two unequilibrated excited states.

Citation

Montagu, J., Gontard, G., Williams, J. A. G., & Moussa, J. (2023). Cyclometallated Platinum(II) Complexes Featuring an Unusual, C^N‐Coordinating Pyridyl‐pyridylidene Ligand and L X Coligands: Synthesis, Structures and Dual Luminescence Behavior. European Journal of Inorganic Chemistry, 26(32), Article e202300487. https://doi.org/10.1002/ejic.202300487

• Journal Article Type: Article
• Acceptance Date: Aug 22, 2023
• Online Publication Date: Sep 15, 2023
• Publication Date: Nov 14, 2023
• Deposit Date: Jan 8, 2024
• Publicly Available Date: Jan 8, 2024
• Journal: European Journal of Inorganic Chemistry
• Print ISSN: 1434-1948
• Electronic ISSN: 1099-0682
• Publisher: Wiley-VCH Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 26
• Issue: 32
• Article Number: e202300487
• DOI: https://doi.org/10.1002/ejic.202300487
• Keywords: Inorganic Chemistry
• Public URL: https://durham-repository.worktribe.com/output/2116339