79153 20250128150424.0 doi 10.1002/chem.201800646 sideral 107084 ART-2018-107084 eng Arnal, L. The Use of Cyclometalated NHCs and Pyrazoles for the Development of Fully Efficient Blue PtII Emitters and Pt/Ag Clusters 2018 Access copy available to the general public Unrestricted New bis-pyrazole complexes [Pt(C^C*)(RpzH)2]X, containing a cyclometalated N-heterocyclic carbene ligand (HC^C*=1-(4-(ethoxycarbonyl)phenyl)-3-methyl-1H-imidazol-2-ylidene) were prepared as chloride (X=Cl-, RpzH: 3,5-Me2pzH 1¿a, 4-MepzH 2¿a, pzH 3¿a), perchlorate (X=ClO4-, 1¿b–3¿b), or hexafluorophosphate (X=PF6-, RpzH: 3,5-Me2pzH 1¿c) salts. The X-ray structure of 1¿a showed that the Cl- anion is trapped by the cation through two N-H···Cl bonds. In solution of methanol, acetone and THF at RT, 1¿a–3¿a coexist in equilibrium with the corresponding [PtCl(C^C*)(RpzH)] (B) and RpzH species. In CH2Cl2, this equilibrium takes place just for 2¿a and 3¿a, but it is completely shifted to the left at 243 and 223 K for 2¿a and 3¿a, respectively. The low-lying absorption and emission bands were assigned to intraligand (ILCT) charge transfer on the NHC group. Quantum yield measurements in PMMA films revealed that 1¿b, 2¿b and 1¿c are amongst the most efficient blue-light emitters, with values up to 100¿%. Proton abstraction from the coordinated 3,5-Me2pzH in 1¿b by NEt3 and replacement by Ag+ afforded a neutral [Pt2Ag2] cluster containing Pt¿Ag dative bonds. info:eu-repo/grantAgreement/ES/DGA/E21 info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2015-67461-P info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 5.16 2018 CHEMISTRY, MULTIDISCIPLINARY 36 / 172 = 0.209 2018 Q1 T1 1.842 2018 Catalysis 2018 Q1 Organic Chemistry 2018 Q1 Chemistry (miscellaneous) 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Fuertes, S. (orcid)0000-0003-1812-3175 Martín, A. Universidad de Zaragoza (orcid)0000-0002-4808-574X Sicilia, V. Universidad de Zaragoza (orcid)0000-0002-0257-0483 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 24, 37 (2018), 9377-9384 Chemistry (Weinh.) Chemistry - A European Journal 0947-6539 1322494 http://zaguan.unizar.es/record/79153/files/texto_completo.pdf Postprint 1550939 http://zaguan.unizar.es/record/79153/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:79153 articulos driver 2025-01-28-15:02:23 ARTICLE