TY - JOUR

T1 - Cyclometalated Au(III) complexes with arylphosphine oxide ligands: synthesis, characterization, and features of photophysical properties in solution and in the solid state

AU - Лугинин, Максим Евгеньевич

AU - Сизова, Анастасия Андреевна

AU - Грачева, Елена Валерьевна

PY - 2026/3/12

Y1 - 2026/3/12

N2 - A series of Au(III) complexes bearing arylphosphine oxide ligands with systematically varied aromatic linkers (conjugate to fused: phenyl, biphenyl, naphthyl, anthracenyl) were synthesized via a Suzuki-Miyaura cross-coupling procedure. Their structures were confirmed by spectroscopic methods and single crystal X-ray diffraction (XRD) analysis. Photophysical studies revealed that the nature of the aromatic linker is a key factor in tuning the emission properties. While complexes with phenyl and biphenyl linkers display phosphorescence from the cyclometalating CNC (CNC = 2,6-diphenylpyridine) ligand, the naphthyl-based analogue exhibits unique dual phosphorescence, originating from two near-lying triplet states localized on the CNC and naphthyl fragments, respectively. In contrast, the anthracenyl-based complex shows ligand-centered fluorescence in solution and dual emission in the solid state. The nature of the electronic transitions responsible for absorption and emission was assigned based on a detailed analysis of DFT calculations.

AB - A series of Au(III) complexes bearing arylphosphine oxide ligands with systematically varied aromatic linkers (conjugate to fused: phenyl, biphenyl, naphthyl, anthracenyl) were synthesized via a Suzuki-Miyaura cross-coupling procedure. Their structures were confirmed by spectroscopic methods and single crystal X-ray diffraction (XRD) analysis. Photophysical studies revealed that the nature of the aromatic linker is a key factor in tuning the emission properties. While complexes with phenyl and biphenyl linkers display phosphorescence from the cyclometalating CNC (CNC = 2,6-diphenylpyridine) ligand, the naphthyl-based analogue exhibits unique dual phosphorescence, originating from two near-lying triplet states localized on the CNC and naphthyl fragments, respectively. In contrast, the anthracenyl-based complex shows ligand-centered fluorescence in solution and dual emission in the solid state. The nature of the electronic transitions responsible for absorption and emission was assigned based on a detailed analysis of DFT calculations.

UR - https://linkinghub.elsevier.com/retrieve/pii/S0925346726001771

UR - https://www.mendeley.com/catalogue/757f4bbb-89ae-37fa-8531-a5b8756b1ec8/

U2 - 10.1016/j.optmat.2026.118017

DO - 10.1016/j.optmat.2026.118017

M3 - Article

VL - 175

JO - Optical Materials

JF - Optical Materials

SN - 0925-3467

M1 - 118017

ER -