Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide The Pt(II) dinuclear compounds [{Pt(C^N)(μ-S^N)} 2 ] [S^NH: 2-mercapto-1-methylimidazol; HC^N= 1-naphthalen-2-yl-1 H -pyrazole (naph-pz, 2a ); benzo[ h ]quinoline (bzq, 2b )] were obtained by reaction of the corresponding mononuclear precursor [Pt(C^N)Cl(S^NH)] (C^N: naph-pz 1a, bzq 1b ) with NEt 3 . Then, 2a and 2b were reacted with aqueous HX (X: Cl, Br, I) in molar ratio 1:2 to give the corresponding oxidized derivatives [{Pt(C^N)(μ-S^N)X} 2 ] (X = Cl 3a/b-Cl, Br 3a/b-Br, I 3a/b-I ). Their X-ray structures showed shorter Pt–Pt distances in the Pt 2 (III) complexes ( ca . 2.7 Å) than in the Pt 2 (II) ones ( ca . 3.0 Å) in agreement with the existence of a Pt–Pt bond. The photophysical properties were studied experimentally and theoretically by DFT and TD-DFT. The Pt 2 (II) complexes exhibit an emission in the visible region (640 nm 2a, 685 nm 2b ) of mostly excimeric 3 ππ* and 3 MMLCT [dσ*(Pt 2 ) → π* (C^N)] character respectively, while the Pt 2 (III) complexes emit in the NIR-II region with maxima reaching up to 1215 nm. The 3 XMMCT nature of these emissions justify the influence of both the axial ligand (X) and the overlap of the dz 2 orbitals on their energies; the latter being affected by the nature of the C^N and the bridging ligand.
Source: Inorganic Chemistry
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4413433919