Intramolecular Down‐ and Up‐Conversion in Dimeric Tetracene Complexes Centered via Platinum(II) and Palladium(II) DOI Creative Commons
Yifan Bo, Yuxuan Hou,

Melchor Matabuena

и другие.

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 13, 2025

Abstract Two dimeric tetracene complexes, Pt(L tc ) 2 Cl and Pd(L , have been synthesized by coordination of a pyridyl substituted acene‐ to Pt(II) Pd(II) metal center. The photophysical properties the two dimers are characterized compared with free ligand L as well corresponding monomeric complexes ( )( ref )Cl )(L shed light on processes intramolecular up‐ down‐conversion, namely triplet‐triplet annihilation singlet fission, respectively. Both show high fluorescence quantum yields, while emission is heavily reduced in complexes. Dimer exhibits efficient fission within 1.6 ns form correlated triplet pair (T 1 T ), confirming that coupling mediated through over remarkably long inter‐chromophore distances. Subsequently, dissociates into triplets + yields ca. 50%. Moreover, due isoenergetic level excited state for dimers, some observed undergo up‐conversion return state, followed upconverted fluorescence. On other hand, photoexcitation gives kinetic behavior similar monomer no but fast intersystem crossing hundreds picoseconds. It noted formation dimer low, non‐radiative decay excitons ground dominates both cases. all metal–organic subtle intrachromophore charge‐transfer characteristics polar solvents schemes apolar solvents.

Язык: Английский

Toward Highly Planar d8-Configured Metal Complexes with Tunable Phosphorescence, 1O2 Photogeneration, and Glass-Forming Abilities DOI
Stefan Buss, Leon Geerkens, Iván Maisuls

и другие.

Organometallics, Год журнала: 2024, Номер 43(16), С. 1736 - 1751

Опубликована: Май 2, 2024

The synthesis, characterization, and photophysical properties of 16 d8-configured metal complexes featuring Pt(II) or Pd(II) centers with N*N∧C-coordinated ligands is presented. Key findings include the discovery that distortion coordination plane improves solubility, as observed for compounds a pyridine-N-donor instead thiazole unit. In addition, we found substitution chlorido coligand by monodentate cyanido unit enhances emitters' performance decreasing nonradiative decay rate. switch from to resulted in weaker ligand field splitting reduced spin–orbit coupling, leading longer average lifetimes without luminescence at room temperature. Interestingly, cyclometalated thiophenyl moiety exhibited red-shifted dual emission. Finally, photoinduced generation singlet dioxygen (1O2), highly reactive oxygen species, critically influenced chelated coligands, they control 1O2 photoproduction quantum yields. These results have significant implications photocatalysis, optoelectronics, biomedical applications.

Язык: Английский

Процитировано

3

Narrow-emitting pyridoimidazole functionalized N-heterocyclic carbene based tetradentate Pt(II) complexes for blue phosphorescent organic light-emitting diodes DOI
Raja Kumaresan,

Junseop Lim,

Hyerin Kim

и другие.

Dyes and Pigments, Год журнала: 2024, Номер 228, С. 112230 - 112230

Опубликована: Май 15, 2024

Язык: Английский

Процитировано

3

Photoluminescence of Platinum(II) Complexes with Diazine‐Based Ligands DOI Creative Commons
Mariia Hruzd, Raphaël Durand, Sébastien Gauthier

и другие.

The Chemical Record, Год журнала: 2024, Номер 24(6)

Опубликована: Июнь 1, 2024

In the last past twenty years, research on luminescent platinum (II) complexes has been intensively developed for useful application such as organic light emitting diodes (OLEDs). More recently, new photoluminescent based diazine ligands (pyrimidine, pyrazine, pyridazine, quinazoline and quinoxaline) have in this context. This review will summarize photophysical properties of most phosphorescent Pt(II) described literature compare results to pyridine analogues whenever possible. Based emission color, photoluminescence quantum yield (PLQY) values, relationship between structure modification, are highlighted. Tuning yields solution solid state and, some complexes, aggregation induced (AIE) or thermally activated delayed fluorescence (TADF) described. When OLEDs built from external efficiency (EQE) values luminance different wavelengths cases, chromaticity coordinates obtained devices, given. Finally, highlights growing interest studies OLED applications.

Язык: Английский

Процитировано

3

Molecular Rigidification of Cyclometalated NCN Pt(II)- and Pd(II)-Based Triplet Emitters DOI
Maryam Niazi, Iván Maisuls, Cristian A. Strassert

и другие.

Organometallics, Год журнала: 2024, Номер 43(14), С. 1547 - 1556

Опубликована: Июль 1, 2024

Язык: Английский

Процитировано

3

RAFT Copolymerization of Pt(II) Pincer Complexes With Water‐Soluble Polymer as an Efficient Way to Obtain Micellar‐Type Nanoparticles With Aggregation‐Induced NIR Emission DOI Creative Commons
Roman A. Shilov, Vadim A. Baigildin, Kristina S. Kisel

и другие.

Aggregate, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 21, 2024

ABSTRACT The idea of preparation a water‐soluble Pt‐containing AIEgen was successfully realized by direct reversible addition‐fragmentation transfer copolymerization Pt(II) complex ( LPtPV ) containing vinyl group and polyvinylpyrrolidone p(VP) ). resulting block‐copolymer p(VP‐ b ‐LPtPV) 5–8 chromophores exhibits intriguing photophysical properties—strong solvent concentration dependence absorption emission characteristics. Various physicochemical analytical methods (NMR spectroscopy, XRD analysis, ESI‐MS, AUC, DLS, ICP‐OES, GPC, viscometry, TEM) were used to characterize the initial complex, its binuclear analogs, . obtained data indicate that properties latter are dictated type aggregation process rather than solvatochromic effects. It is shown at low in organic solvents, platinum either absent (dimethylformamide) or occurs predominantly intramolecular level (MeCN), whereas aqueous media, readily aggregates into micellar‐type nanoparticles with hydrophilic corona hydrophobic core, which strong intra‐ intermolecular Pt···Pt and/or π···π interactions result significant red shift down 600 816 nm, respectively. Despite NIR area where commonly quenched nonradiative vibrational relaxation, an increase quantum yield complete agreement typical aggregation‐induced (AIE) emitters’ behavior. Quantum mechanics/molecular mechanics simulations processes also confirm trends relationship between mode behavior, particularly, variations energy gaps ground state AIEgens their excited singlet triplet states.

Язык: Английский

Процитировано

3

Reversible Piezochromism of Platinum(II) and Palladium(II) Dimers in Molecular Single Crystals DOI
Paul Steeger, Tobias Theiss,

Dominik Schwab

и другие.

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Янв. 23, 2025

Transition metal complexes are well-known for their efficient light emission and promising applications ranging from bioimaging to light-emitting diodes. In solution, interactions between the centers of two become possible drastically change photophysical properties. For real-world devices, solid-state materials consisting these molecules preferable. Recently, ligand-controlled aggregation platinum(II) palladium(II) into molecular single crystals controlled formation metal-metal contacts have been demonstrated. Here, we show how distance can be tuned in a way by exerting pressure on crystal. Using optical spectroscopy inside diamond anvil cell, find strong reversible piezochromism up 18 GPa. time-dependent density functional theory, attribute wavelength shift reduction enhanced π orbital overlap dimers.

Язык: Английский

Процитировано

0

Efficient tetradentate palladium(II) emitters for sky-blue OLEDs through tuning triplet excited states DOI
Kewei Xu,

Jianbing Zheng,

Feng Zhan

и другие.

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 159948 - 159948

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0

Syntheses, Crystal Structures and Properties of Four Unsymmetric Single-wing Butterfly-shaped Platinum(II) Bis-alkynyl Complexes with Tunable Emissive Colors DOI
Xiao-Man Li, Jiaxing Li,

Kun-Peng Zhang

и другие.

Journal of Molecular Structure, Год журнала: 2025, Номер unknown, С. 141983 - 141983

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

0

Synthesis and Photophysics of the Doubly Cyclometalated Pd(II) Complexes [Pd(CNC)(L)], L = PPh3, AsPh3, and SbPh3 DOI
Rose Jordan,

Sam Kler,

Iván Maisuls

и другие.

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 27, 2025

While Pt(II) complexes containing doubly cyclometalated ligands as tridentate luminophores are well studied, the synthetic accessibility of their Pd(II) counterparts was lacking for a long time. Inspired by recent report on synthesis [Pd(dpp)(PPh3)] involving C∧N∧C coordination mode (with dpp2– = 2,6-di(phenid-2-yl)pyridine) and following our own work closely related Pt(II)-based compounds, we produced series [Pd(dpp)(PnPh3)] (Pn P, As, Sb) optimizing procedure exploring reactivity in process. Our study electrochemical (cyclic voltammetry) photophysical (UV–vis absorption emission, transient (TA) spectroscopy) properties Pd(C∧N∧C) represents first characterization. We observed UV–vis bands down to 450 nm HOMO–LUMO gaps around 3.2 V, which show minimal variation with different PnPh3 coligands. A more pronounced influence coligand time-resolved emission TA spectroscopy. The highest photoluminescence quantum yield (ΦL) found [Pd(dpp)(AsPh3)], reaching 0.06. interpretation spectroscopic data is supported (TD-)DFT calculations. Additionally, structural several dinuclear complexes, including precursor {[Pd(dppH)(μ-Cl)]}2 multiple decomposition products sensitive compounds [Pd(dpp)(PnPh3)].

Язык: Английский

Процитировано

0

Luminescent Binuclear Pd (II) N^C^N‐Pincer Complexes With N^N Bridging Ligand DOI

Xiaping Zhu,

Yunjun Shen, Yuzhen Zhang

и другие.

Applied Organometallic Chemistry, Год журнала: 2025, Номер 39(5)

Опубликована: Апрель 8, 2025

ABSTRACT Two novel binuclear cyclometalated Pd (II) complexes with two tridentate phenylpyridine ligands and a N^N ligand were readily synthesized. Both structures unambiguously characterized via X‐ray single crystal diffraction, nuclear magnetic resonance (NMR) spectra, high‐resolution mass spectrometry (HRMS). The structure data reveals that the Pd–Pd distances of [Pd(1,3‐di(2‐pyridyl)benzene)] 2 (Dpf) (DpfH = N , ′‐diphenyl formamidine) Pd1 [Pd(1,3‐di(2‐pyridyl)benzene] ( α ‐Car) ‐CarH ‐carboline) Pd2 measure 3.0046(3) 3.1518(8) Å, respectively. absorption spectra display metal–metal‐to‐ligand charge transfer (MMLCT) transitions. In solid state, they show triplet emissions at 635 607 nm, While in 1 wt% PMMA film, emission peaks are located 602 571 contrast, both very weak solution their maximum wavelengths significantly red‐shifted. Based on photophysical properties, films quartz squares was placed different organic or acid solvents for 30 min then utilized to detect solvent vapor. film showed unique quenching vapor acetone.

Язык: Английский

Процитировано

0