000170357 001__ 170357
000170357 005__ 20260410165452.0
000170357 0247_ $$2doi$$a10.1039/d6qm00041j
000170357 0248_ $$2sideral$$a148851
000170357 037__ $$aART-2026-148851
000170357 041__ $$aeng
000170357 100__ $$aMelendo, Irene
000170357 245__ $$aDouble decker NHC-cyclometallated Pt complexes for highly-efficient vacuum-deposited green OLEDs and NIR emission
000170357 260__ $$c2026
000170357 5060_ $$aAccess copy available to the general public$$fUnrestricted
000170357 5203_ $$aThe dinuclear compound [{PtII(C^C*)(µ-N^N)}2] (HN^N: diphenylformamidine; HC^C* = 3-methyl-1-(naphthalen-2-yl)-1H-imidazol-2-ylidene, 3) was obtained as a pure single anti-isomer, with a Pt–Pt distance of 2.8645 Å. Under UV light, 3 reacted with haloforms to obtain the corresponding oxidized species [{PtIII(C^C*)(µ-N^N)X}2] (4-X). X-ray analysis of 4-Cl confirmed the retention of the anti-conformation and revealed a shortened Pt–Pt distance (2.6070 Å) consistent with metal–metal bonding in the Pt2(III,III) system. In addition, methylation of the electron-rich complex 3 with [Me3O]BF4 provided the mixed-valence dinuclear species [(C^C*)PtII(µ-N^N)2PtIV(C^C*)(CH3)]BF4 (5), which exhibits two distinct 195Pt NMR resonances (δ: −2373 and −3264 ppm) and a large Pt–Pt coupling constant (2155 Hz). Compound 3 shows a structureless emission band at 520 nm in 2 wt% PMMA (poly(methyl methacrylate)) film, with a photoluminescence decay of 1.80 µs and quantum yield of 0.90, typical of triplet metal–metal–to-ligand charge transfer (3MMLCT) [dσ*(Pt–Pt) → π*(C^C*)] excited states. The oxidized counterparts, 4-X, display phosphorescent emissions with maxima at 960, 970 and 1055 nm in solid state at 77 K. These are tentatively assigned to triplet axial ligand-to-metal–metal charge transfer (3XMMCT) [σ(X) → dσ*(Pt–Pt)]. Whilst complex 5 shows no emission in either the visible or near-infrared regions at 298 or 77 K. Organic light-emitting diodes (OLEDs) incorporating 3 as a green emitter demonstrate excellent device performance, achieving a turn-on voltage of 3 V, an external quantum efficiency (EQE) reaching 22% and a maximum luminance exceeding 22 000 cd m−2.
000170357 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E17-23R$$9info:eu-repo/grantAgreement/ES/MICIU/PID2024-155563NB-I00
000170357 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttps://creativecommons.org/licenses/by-nc/4.0/deed.es
000170357 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000170357 700__ $$aWeatherill, Lucy A.
000170357 700__ $$0(orcid)0000-0002-4808-574X$$aMartín, Antonio
000170357 700__ $$aPander, Piotr
000170357 700__ $$aDias, Fernando B.
000170357 700__ $$0(orcid)0000-0003-1812-3175$$aFuertes, Sara
000170357 700__ $$0(orcid)0000-0002-0257-0483$$aSicilia, Violeta$$uUniversidad de Zaragoza
000170357 7102_ $$12010$$2760$$aUniversidad de Zaragoza$$bDpto. Química Inorgánica$$cÁrea Química Inorgánica
000170357 773__ $$g(2026), [11 pp.]$$pMater. chem. front.$$tMaterials Chemistry Frontiers$$x2052-1537
000170357 8564_ $$s2371645$$uhttps://zaguan.unizar.es/record/170357/files/texto_completo.pdf$$yVersión publicada
000170357 8564_ $$s2765626$$uhttps://zaguan.unizar.es/record/170357/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000170357 909CO $$ooai:zaguan.unizar.es:170357$$particulos$$pdriver
000170357 951__ $$a2026-04-10-13:47:12
000170357 980__ $$aARTICLE