148121 20250210083428.0 doi 10.1016/j.dyepig.2025.112641 sideral 141562 ART-2025-141562 eng Melendo, Irene Sizing-up the aromatic system of a Cyclometalated n-Heterocyclic Carbene in a luminescent platinum-based sensor to xanthine 2025 Access copy available to the general public Unrestricted A cyclometalated N-heterocyclic carbene platinum(II) complex comprising a phenanthrenyl moiety has been prepared and used to synthesize neutral and cationic luminescent complexes containing different ancillary ligands: [Pt(PhenˆC*)(acac)] (5), [Pt(PhenˆC*)(CNXyl)2]PF6 (6) and [Pt(PhenˆC*)(PˆP)]PF6 (PˆP: 1,1-bis(diphenylphosphino)methane, dppm 7; 1,2-bis(diphenylphosphino)ethane, dppe, 8, 1,2-bis(diphenylphosphino)benzene, dppbz, 9). Structural characterization by NMR and single-crystal X-ray studies endorsed the proposed molecular structure for these complexes with the formation of a six-membered platinacycle. Photophysical and computational studies for 5-9 disclosed the ligand-centered nature of the triplet state, mainly governed by the extended aromatic system of the PhenˆC* ligand. Immobilized in ethyl cellulose (EC) films, compound 5 shows elevated quantum yield and long decay times in argon atmosphere and high sensitivity to molecular oxygen. Blends of 5 and EC (C5) were tested as a luminescent oxygen probe for the determination of xanthine (Xn), showing good photo stability and reversibility. The RSD is 0.9% (n=3) for 3·10-4 M and the detection limit achieves values of ∼ 2·10-5 M. This platinum-based sensor delivers better results than the ones obtained with [Ru(bpy)3]Cl2·6 H2O, a typical luminophore used in commercial oxygen sensors. To improve the feasibility of the Xn determination, the sensor was implemented in a smartphone adapted device to be used as a in-situ Xn control. info:eu-repo/grantAgreement/ES/DGA/E17-23R info:eu-repo/grantAgreement/ES/DGA/E25-23R info:eu-repo/grantAgreement/ES/MICINN/PID2021-122869NB-I00 info:eu-repo/grantAgreement/ES/MICINN/PID2022-139235OB-I00 info:eu-repo/semantics/embargoedAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Camacho-Aguayo, Javier Universidad de Zaragoza (orcid)0000-0003-1654-3803 Fuertes, Sara (orcid)0000-0003-1812-3175 Martín, Antonio (orcid)0000-0002-4808-574X Marcos, Susana de Universidad de Zaragoza (orcid)0000-0002-7902-6005 Galbán, Javier Universidad de Zaragoza (orcid)0000-0002-8973-5104 Sicilia, Violeta Universidad de Zaragoza (orcid)0000-0002-0257-0483 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 2009 750 Universidad de Zaragoza Dpto. Química Analítica Área Química Analítica 235 (2025), 112641 [36 pp.] Dyes pigm. Dyes and Pigments 0143-7208 1007659 http://zaguan.unizar.es/record/148121/files/texto_completo.pdf Postprint info:eu-repo/date/embargoEnd/2027-01-09 1058489 http://zaguan.unizar.es/record/148121/files/texto_completo.jpg?subformat=icon icon Postprint info:eu-repo/date/embargoEnd/2027-01-09 oai:zaguan.unizar.es:148121 articulos driver 2025-02-10-08:31:25 ARTICLE