Viable access to the triplet excited state in peryleneimide based palladium complex $$^{\S }$$ §

Philip, Abbey M.; Sebastian, Ebin; Gopan, Gopika

doi:10.1007/s12039-018-1537-x

Cited by 3 publications

(3 citation statements)

References 45 publications

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“…Hariharan et al [ 59 ] studied how the incorporation of Pd affected the perylenemonoimide (PMI) chromophore 1 . They found that the incorporation of Pd was correlated with better access to triplet-excited states by ISC, associated with a greater spin–orbit coupling (SOC).…”

Section: Orthopalladated Ligandsmentioning

confidence: 99%

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Luminescence and Palladium: The Odd Couple

Dalmau

Urriolabeitia

2023

Molecules

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The synthesis, photophysical properties, and applications of highly fluorescent and phosphorescent palladium complexes are reviewed, covering the period 2018–2022. Despite the fact that the Pd atom appears closely related with an efficient quenching of the fluorescence of different molecules, different synthetic strategies have been recently optimized to achieve the preservation and even the amplification of the luminescent properties of several fluorophores after Pd incorporation. Beyond classical methodologies such as orthopalladation or the use of highly emissive ligands as porphyrins and related systems (for instance, biladiene), new concepts such as AIE (Aggregation Induced Emission) in metallacages or in coordination-driven supramolecular compounds (CDS) by restriction of intramolecular motions (RIM), or complexes showing TADF (Thermally Activated Delayed Fluorescence), are here described and analysed. Without pretending to be comprehensive, selected examples of applications in areas such as the fabrication of lighting devices, biological markers, photodynamic therapy, or oxygen sensing are also here reported.

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Section: Orthopalladated Ligandsmentioning

confidence: 99%

“… Jablonski diagram depicting the energy levels and the photophysics of PMI 1 and PMI-Pd 2 . Adapted from [ 59 ]. …”

Section: Figurementioning

confidence: 99%

Luminescence and Palladium: The Odd Couple

Dalmau

Urriolabeitia

2023

Molecules

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“…[11] These emission characteristics of the PDI core matches well with the earlier reports of perylene chromophores. [9,12,26,27] Figure 1D shows FL spectra of PDIDA (in benzene) at various excitation wavelengths within the absorption range of PDIDA. The spectra reveal that PDIDA emission remains unaffected by the excitation wavelength indicating that the structure of the absorption spectrum is indeed due to the vibrational modes of the same electronically excited state.…”

Section: Absorption and Emission Characteristics: Pdida Electronic mentioning

confidence: 99%

Optoelectronically active luminescent valine‐substituted perylene diimide: structure‐property correlation via spectroscopic and density functional approaches

Durga

Verma

Tomar

et al. 2020

J of Physical Organic Chem

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In literature, the applicability of solution‐phase perylene diimides (PDIs) semiconductors are limited due to their restricted solubility in solvents. In contrast, we synthesized a highly soluble and novel valine‐functionalized PDI derivative (perylene diimide diacid, PDIDA) whose optical and electrical properties were carefully assessed by experimental and density functional approaches. Notably, on valine substitution, the ultraviolet‐visible absorption band centered at 524 nm was attributed to the predominant HOMO ➔ LUMO electronic transition (weighing coefficient = 99 %). Interestingly, the nonuniform variation (W‐shaped) in absorption energy for HOMO ➔ LUMO electronic transition in PDIDA with solvent dielectric constant was experimentally witnessed. The latter was computationally attributed to the more S1 stabilization over So solvent stabilization, particularly in ethanol and dimethyl sulfoxide (DMSO). Furthermore, upon 525 nm excitation, the maximum fluorescence emission was observed at 533 nm with photoluminescence quantum yield as high as 0.77. Interestingly, similar to absorption studies, pronounced influence of solvent polarity was evident on the emission maximum particularly in ethanol and DMSO. Subsequently, electrochemical investigation proved that the PDIDA sustained the intrinsic n‐type semiconductivity with a dielectric constant (εr) 5, a current of 0.54 mA at 5 V, and an electrical conductivity of 1.88 × 10−5 Sm−1. Owing to the above remarkable properties of the synthesized PDIDA, it holds potential applications in photovoltaics, fluorescence‐based detectors and n‐type channel field effect transistors, and so forth.

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Ultrafast Spectroscopic Studies on Excited State Dynamics of Different Alkyl Substituted Perylene Monoimides in Solution and Thin Films

Dhami,

Khatun,

Sengupta

et al. 2024

ChemistrySelect

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Perylene monoimides (PMI) are a unique class of polyaromatic molecules, which are known to undergo interesting excited state processes, making them attractive for the applications in optoelectronic devices. In this paper a comprehensive investigation is conducted on the photophysical properties and excited state dynamics of a series of PMI derivatives (PMI‐C18, PMI‐CE6, PMI‐C8, and PMI‐C6), with varying side chains substituted at the imide position. These studies involved utilization of both steady state and time resolved spectroscopic techniques. Femtosecond transient absorption (TA) spectroscopic studies demonstrated that PMI derivatives exhibit similar fluorescence characteristic in solution, irrespective of the various side chains substituted at the imide position. However, in thin films the various side chains led to prominent differences in their packing arrangement, which leads to difference in the TA spectra as compared to solution. The difference in the packing arrangement in PMI thin films is studied using X‐ray diffraction (XRD) spectroscopy. It is notable that the PMI‐CE6 thin films exhibited the existence of triplet state. The distinctive behavior of PMI‐CE6 is attributed to the distinct packing arrangement, providing role of molecular structure in influencing the excited state dynamics. The triplet state formation in PMI thin films renders them well‐suited for utilization in optoelectronic devices.

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Viable access to the triplet excited state in peryleneimide based palladium complex $$^{\S }$$ §

Cited by 3 publications

References 45 publications

Luminescence and Palladium: The Odd Couple

Luminescence and Palladium: The Odd Couple

Optoelectronically active luminescent valine‐substituted perylene diimide: structure‐property correlation via spectroscopic and density functional approaches

Ultrafast Spectroscopic Studies on Excited State Dynamics of Different Alkyl Substituted Perylene Monoimides in Solution and Thin Films

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