NIR-II Emission from Cyclometalated Dinuclear Pt(III) Complexes

Melendo, Irene ; Fuertes, Sara ; Martín, Antonio ; Sicilia, Violeta (Universidad de Zaragoza)

Resumen: Half-lantern Pt(II) dinuclear complexes [{Pt(C∧Npz)(μ-S∧NR)}2] (HC∧Npz = 1-naphthalen-2-yl-1H-pyrazole; R = H, HS∧N: 2-mercaptopyrimidine 1; R = CF3, HS∧NF: 4-(trifluoromethyl)-2-mercaptopyrimidine 2) were selectively obtained as single isomers with the C∧N groups in an anti-arrangement and rather short metallophilic interactions (dPt–Pt = 2.8684(2) Å for 2). They reacted with haloforms in the air and sunlight to obtain the corresponding oxidized diplatinum(III) derivatives [{Pt(C∧Npz)(μ-S∧NR)X}2] (X = Cl (1-Cl), Br (1-Br), I (1-I, 2-I)). The single-crystal X-ray structures exhibit Pt–Pt distances typical for the existence of a metal–metal bond, which evidence fairly well the influence of the axial ligand (X). The reactions of 1 and 2 with CHI3 in the dark afforded mixtures of [IPt(C∧Npz)(μ-S∧N)2Pt(C∧Npz)CHI2] and 1-I or 2-I, with the former being the major species under an Ar atmosphere, while the reactions of 1 with CHBr3 and CHCl3 need light to occur. These Pt2(III,III) complexes display low-energy absorptions and emissions that strongly depend on the axial ligand. In the solid state, they show a broad NIR emission ranging from 985 to 1070 nm at RT that suffers a hypsochromic shift when cooling down to 77 K. The photoemissive behavior of the dinuclear Pt(II) and Pt(III) systems is disclosed with the aid of density functional theory calculations.

Idioma: Inglés

DOI: 10.1021/acs.inorgchem.3c04314

Año: 2024

Publicado en: Inorganic Chemistry 63, 12 (2024), 5470-5480
ISSN: 0020-1669

Factor impacto JCR: 4.7 (2024)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 6 / 43 = 0.14 (2024) - Q1 - T1

Factor impacto CITESCORE: 7.4 - Inorganic Chemistry (Q1) - Physical and Theoretical Chemistry (Q1)

Factor impacto SCIMAGO: 0.958 - Chemistry (miscellaneous) (Q1) - Physical and Theoretical Chemistry (Q1) - Inorganic Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E17-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-122869NB-I00

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)