TY - JOUR

T1 - Homoleptic alkynylphosphonium Au(I) complexes as push-pull phosphorescent emitters

AU - Петровский, Станислав Константинович

AU - Падерина, Александра Владимировна

AU - Сизова, Анастасия Андреевна

AU - Грачева, Елена Валерьевна

PY - 2023/3/20

Y1 - 2023/3/20

N2 - A series of compounds P1-P4 bearing terminal alkynyl sites connected with a phosphonium group via different π-conjugated linkers have been synthesized. The compounds themselves are efficient push-pull emitters and exhibit bright fluorescence in blue and near-UV regions. P1-P4 were used as alkynyl ligands to obtain a series of homoleptic bis-alkynyl Au(I) complexes 1-4. The complexes demonstrate bright phosphorescence and dual emission with dominating phosphorescence (2-4). Terphenyl derivative complex 3 exhibits warm white emission in DMSO solution and pure white emission in PMMA films. Time-dependent density functional theory calculations have shown that the T1 excited state has a hybrid MLCT/ILCT nature with a dominant contribution of charge transfer across a ligand-centered “D-π-A” system. The variation of linker allows tuning the effect of intermolecular charge transfer and thus changing the electronic and photophysical properties of the organogold “D-π-A” system. The results presented unambiguously display the advances of the conception of organometallic “D-π-A” construction.

AB - A series of compounds P1-P4 bearing terminal alkynyl sites connected with a phosphonium group via different π-conjugated linkers have been synthesized. The compounds themselves are efficient push-pull emitters and exhibit bright fluorescence in blue and near-UV regions. P1-P4 were used as alkynyl ligands to obtain a series of homoleptic bis-alkynyl Au(I) complexes 1-4. The complexes demonstrate bright phosphorescence and dual emission with dominating phosphorescence (2-4). Terphenyl derivative complex 3 exhibits warm white emission in DMSO solution and pure white emission in PMMA films. Time-dependent density functional theory calculations have shown that the T1 excited state has a hybrid MLCT/ILCT nature with a dominant contribution of charge transfer across a ligand-centered “D-π-A” system. The variation of linker allows tuning the effect of intermolecular charge transfer and thus changing the electronic and photophysical properties of the organogold “D-π-A” system. The results presented unambiguously display the advances of the conception of organometallic “D-π-A” construction.

UR - https://www.mendeley.com/catalogue/0aa0e64e-a9cc-3faa-b992-1db6672e0eb3/

U2 - 10.1021/acs.inorgchem.2c04360

DO - 10.1021/acs.inorgchem.2c04360

M3 - Article

VL - 62

SP - 5123

EP - 5133

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

IS - 13

ER -