000162225 001__ 162225
000162225 005__ 20251017144628.0
000162225 0247_ $$2doi$$a10.1039/d5qm00310e
000162225 0248_ $$2sideral$$a144807
000162225 037__ $$aART-2025-144807
000162225 041__ $$aeng
000162225 100__ $$aCañadas, Purificación
000162225 245__ $$aPlatinum(II) complexes bearing functionalized NHC-based pincer ligands: synthesis and application in phosphorescent OLEDs
000162225 260__ $$c2025
000162225 5060_ $$aAccess copy available to the general public$$fUnrestricted
000162225 5203_ $$aA set of neutral platinum(II) complexes bearing a bis-N-heterocyclic carbene (NHC) pincer ligand with stoichiometry [Pt(CR*^CCN^CR*)L] (R = Me (a), Et (b); L = Cl (2), Cbz (3), and CN (4)) have been prepared. By employing the corresponding bisimidazolium salt (1a or 1b), silver oxide and [PtCl2(cod)] we obtained the Cl derivatives. Then, the subsequent ancillary ligand exchange rendered complexes 3 and 4. Single-crystal X-ray analysis revealed no Pt–Pt contacts, but some π–π intermolecular interactions within the supramolecular structure of the Cl and CN derivatives. It also showed different crystal packings for the two polymorphs of the Cl complex (2b). In diluted solution, photophysical and computational studies disclosed the nature of the low-lying electronic transitions to be mainly 3ILCT [π(C*^C^C*) → π*(C*^C^C*)]/3MLCT [5d(Pt) → π*(C*^C^C*)] for Cl and CN derivatives and L′LCT [π(Cbz) → π*(C*^C^C*)]/L′MCT [π(Cbz) → d(Pt)] for the Cbz counterpart. The blue (2b), green (3b) and yellowish-orange (4b) emissions of 2 wt% PMMA films at λex = 370 nm exhibited very high quantum yields (QYs) reaching up to ∼99%. However, at λex > 400 nm, in the solid state or in 20 wt% PMMA films, additional structureless low-energy emissions arose from extended structures with a higher degree of aggregation. Complexes 2b–4b were used as emitters in organic light-emitting diodes (OLEDs), either with a doped or a non-doped emissive layer. Interestingly, and due to their aggregation in extended structures, their emission could be tuned from bluish green to orange just by changing the thickness of the active layers. Devices with 4b reached a maximum efficiency of 8.08% and a high luminance of 34 071 cd m−2.
000162225 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E17-23R$$9info:eu-repo/grantAgreement/EC/HORIZON EUROPE/101073045 /EU/- addressing the challenges of high-performance solut$$9info:eu-repo/grantAgreement/ES/MICINN/PID2021-122869NB-I00
000162225 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttps://creativecommons.org/licenses/by-nc/4.0/deed.es
000162225 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000162225 700__ $$aForzatti, Michele
000162225 700__ $$0(orcid)0000-0003-1812-3175$$aFuertes, Sara
000162225 700__ $$0(orcid)0000-0002-4808-574X$$aMartín, Antonio
000162225 700__ $$aSessolo, Michele
000162225 700__ $$aTordera, Daniel
000162225 700__ $$0(orcid)0000-0002-0257-0483$$aSicilia, Violeta$$uUniversidad de Zaragoza
000162225 7102_ $$12010$$2760$$aUniversidad de Zaragoza$$bDpto. Química Inorgánica$$cÁrea Química Inorgánica
000162225 773__ $$g(2025), [12 pp.]$$pMater. chem. front.$$tMaterials Chemistry Frontiers$$x2052-1537
000162225 8564_ $$s2622782$$uhttps://zaguan.unizar.es/record/162225/files/texto_completo.pdf$$yVersión publicada
000162225 8564_ $$s2819784$$uhttps://zaguan.unizar.es/record/162225/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000162225 909CO $$ooai:zaguan.unizar.es:162225$$particulos$$pdriver
000162225 951__ $$a2025-10-17-14:25:02
000162225 980__ $$aARTICLE