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

Supramolecular Assembly of Water‐Soluble Platinum(II) Complexes: From Emission Modulation to Cell Imaging in Specific Organelles DOI Creative Commons

Tobias Rex,

Theresa Mößer,

Raquel R. C. Vilela

и другие.

Chemistry - A European Journal, Год журнала: 2025, Номер unknown

Опубликована: Апрель 29, 2025

Abstract The control of self‐organized metal complexes presents advantages regarding the modulation luminescence through dynamic assembly, rendering them promising for bioimaging. Herein, we demonstrate a strategy towards series amphiphilic Pt(II) featuring bis‐cyclometalated ligands as tetradentate luminophores, which exhibit enhanced water solubility and tuneable self‐assembly properties. resulting nanostructures can be precisely controlled by adjusting concentration solvent composition, yielding switchable from red ( i. e ., excimer‐based) to green monomer‐centred) reversible (dis−)assembly aggregates. Cytotoxicity assays confirmed innocuous nature these luminophores at concentrations below 10 μM, while cellular uptake studies demonstrated effective internalization in both living fixed cells. Using photoluminescence lifetime imaging micro(spectro)scopy, determined that localized preferentially within lysosomes cells, accumulating nuclei with differences photophysical behavior depending on whether species were monomeric or excimeric nature. These new findings provide insights into systematic design water‐soluble Pt(II)‐based properties supramolecular interactions, underlining their potential use diagnostics.

Язык: Английский

Процитировано

0
Control of Pt···Pt interactions in Pt(II) complex crystals as luminescence sensors for the detection of external stimuli: recent achievements and perspectives DOI Open Access
Masaki Yoshida, Masako Kato

Analytical Sciences, Год журнала: 2025, Номер unknown

Опубликована: Апрель 30, 2025

Язык: Английский

Процитировано

0
Unusual Optical Switches of Platinum(II) Foldamers for Stepwise Photonic Information Storage Materials DOI

Zhu Shu,

Yinghao Zhang, Zhigang Ni

и другие.

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

Abstract Luminescent switches with multiple optical outputs are essential for meeting the growing demand high‐security encryption. Herein, symmetric and chiral molecules designed synthesized by integrating luminescent planar Pt(II) moieties into SS / RR ‐trans‐1,2‐cyclohexane diamine scaffolds. This approach enables correlation of structures, assemblies, optical/chiroptical properties these materials, which exhibit spacer‐dependent chiroptical behavior. The more rigid foldamer shows unusual switching from monomer to intramolecular excimers corresponding circular dichroism circularly polarized luminescence increasing temperature, differing significantly conventional chromophores. Based on its reversible sensitive multicolor phosphorescence characteristics, molecular is employed create a stepwise anticounterfeit ink, advancing anti‐counterfeiting technology.

Язык: Английский

Процитировано

0
Molecular Engineering of 2D Organic–Inorganic Hybrid Perovskites for Room-Temperature Warm-White Light Phosphorescence DOI

Guangyou Liu,

Zheng Lai,

Yuchen Yang

и другие.

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

Developing room-temperature phosphorescence (RTP) in organic-inorganic hybrid perovskites (OIHPs) with color tunability is an attractive topic for investigating how the coupling between organic and inorganic components affects spin-orbital effects triplet state energy transfer. We demonstrate that modulation of spacer cations OIHPs can effectively realize tunable white-light RTP. By gradually substituting 2-phenylethylamine (PEA) (PEA)2PbBr4 naphthalene-type (N-naphthyl methylamine, NMA), excitons be extracted from part transferred to produce a In particular, OIHP crystal stoichiometry (PEA)0.8(NMA)1.2PbBr4 leads warm-white light due contribution additional ultraviolet absorption, which was then exploited fabricate phosphorescent LED. A similar approach also applied 1-pyrenemethylamine (PRMA) cations. controlling content ratio PRMA PEA molecules, colorful emissions were realized (PEA)x(PRMA)2-xPbBr4 (0 ≤ x 2). The lifetimes (PEA)1.4(PRMA)0.6PbBr4 are 3.18 ms at 473 nm 3.02 618 nm, respectively. Our results provide effective strategy synthesizing multicolor by tuning different fluorophore molecules.

Язык: Английский

Процитировано

0
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

Процитировано

0