Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Five heteroleptic Pt(II) complexes structurally defined by a diethyl-substituted bis(2-pyridylimino)isoindoline (BPI Et ) core and an ancillary alkynyl coligand are reported. Structural variation across Pt(BPI Et )(1–5) was achieved through different alkyne coligands: phenylacetylene (1), 4-ethynylanisole (2), 3-ethynylthiophene (3), 1-ethynyl-4-fluorobenzene (4), 1-ethynyl-4-dimethylaniline (5). Complexes were fully characterized using a range of spectroscopic and analytical techniques: 1 H and 13 C NMR, IR, UV–vis, luminescence, and transient absorption spectroscopies, HRMS, and cyclic voltammetry. Two X-ray structures revealed a subtle deviation from idealized square planar geometry where the Pt atom lies within the plane defined by the three nitrogen donors of BPI Et . The redox behavior of the complexes showed one irreversible oxidation between +0.61 and +0.82 V (attributed to Pt 2+/3+ couple) and two well-defined ligand-based reductions with fully or quasi-reversible character between −1.70 and −2.09 V. Photophysical studies and supporting DFT calculations describe the phosphorescent nature of the complexes (λ em = 625–644 nm in toluene) with strong metal-to-ligand charge transfer (MLCT) character and notable singlet oxygen photogeneration (up to 73%). Triplet–triplet annihilation energy upconversion (TTA-UC) investigations in toluene indicated that this class of triplet emitting complex are viable photosensitizers with an impressive maximum efficiency of Φ UC = 29.6% for Pt(BPI Et )(4) .
Source: Inorganic Chemistry
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4417182109