Photoinduced intramolecular charge transfer and relaxation dynamics of 4-dimethylaminopyridine in water, alcohols, and aprotic solvents

Demeter, Attila; Kovalenko, Sergey A.

doi:10.1016/j.jphotochem.2021.113246

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Photoemission properties of 4-dimethylaminopyridine and similar compounds have been reported previously. [34][35][36][37] Based on the reported literature, the emission from the organic cations is due to intramolecular charge transfer (ICT), with proposed mechanisms including twisted intramolecular charge transfer (TICT), rehybridization intramolecular charge transfer (RICT), wagging intramolecular charge transfer (WICT), or planar intramolecular charge transfer. [35,[38][39][40] López-de-Luzuriaga et al, reports in their DMAPÀ Au complex that the lower energy emission around 443 nm is due to charge transfer from the phenyl ring to the dimethylamino group.…”

Section: Crystal Structures and Stabilitymentioning

confidence: 99%

(C₇H₁₁N₂)₂MBr₄ (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

et al. 2022

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Herein, a new family of hybrid metal halides, (DMAP)2MBr4 (M = Cu, Zn), featuring zero‐dimensional (0D), pseudo‐layered crystal structures containing isolated molecular 4‐dimethylaminopyridinium (DMAP, C7H11N2+) cations and MBr42− tetrahedral anions are reported. (DMAP)2MBr4 show remarkable long‐term stability, with no signs of degradation after one year of ambient air exposure. The reported solution synthesis affords large crystals measuring up to 1 cm, which showed significant response to soft 8 keV X‐ray photons when implemented into X‐ray detectors. Furthermore, (DMAP)2ZnBr4 demonstrates tunable color light emission properties, which is attributed to the organic molecular units based on our combined experimental and computational results. The measured photoluminescence quantum yield (PLQY) for (DMAP)2ZnBr4 is 7.35 %, a remarkable enhancement of emission efficiency as compared to a weak emission from the organic precursor. The inexpensive and earth‐abundant chemical compositions and ease of preparation of the new hybrid metal halides make them promising candidates for optical and electronic applications.

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Section: Crystal Structures and Stabilitymentioning

confidence: 99%

(C₇H₁₁N₂)₂MBr₄ (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

et al. 2022

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“…On the other hand, an increase in fluorescence, along with a blue shift of the emission maximum, was observed for DB-Dan upon increasing the THF percentage. At 90% THF, a 6.8-fold emission enhancement and a blue shift of the emission maximum by 41 nm (from 562 nm to 521 nm) was resulted, and these solvatochromic and fluorogenic effects are consistent with an ICT mechanism [ 31 , 32 ]. No significant change in the emission maximum and intensity was found for DB-Dan at different ionic strengths.…”

Section: Resultsmentioning

confidence: 99%

Development of Fluorescent Turn-On Probes for CAG-RNA Repeats

et al. 2022

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Fluorescent sensing of nucleic acids is a highly sensitive and efficient bioanalytical method for their study in cellular processes, detection and diagnosis in related diseases. However, the design of small molecule fluorescent probes for the selective binding and detection of RNA of a specific sequence is very challenging because of their diverse, dynamic, and flexible structures. By modifying a bis(amidinium)-based small molecular binder that is known to selectively target RNA with CAG repeats using an environment-sensitive fluorophore, a turn-on fluorescent probe featuring aggregation-induced emission (AIE) is successfully developed in this proof-of-concept study. The probe (DB-TPE) exhibits a strong, 19-fold fluorescence enhancement upon binding to a short CAG RNA, and the binding and fluorescence response was found to be specific to the overall RNA secondary structure with A·A mismatches. These promising analytical performances suggest that the probe could be applied in pathological studies, disease progression monitoring, as well as diagnosis of related neurodegenerative diseases due to expanded CAG RNA repeats.

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Photoinduced intramolecular charge transfer and relaxation dynamics of 4-dimethylaminopyridine in water, alcohols, and aprotic solvents

Cited by 2 publications

References 33 publications

(C₇H₁₁N₂)₂MBr₄ (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

(C₇H₁₁N₂)₂MBr₄ (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

Development of Fluorescent Turn-On Probes for CAG-RNA Repeats

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Photoinduced intramolecular charge transfer and relaxation dynamics of 4-dimethylaminopyridine in water, alcohols, and aprotic solvents

Cited by 2 publications

References 33 publications

(C7H11N2)2MBr4 (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

(C7H11N2)2MBr4 (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

Development of Fluorescent Turn-On Probes for CAG-RNA Repeats

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Product

Resources

About

(C₇H₁₁N₂)₂MBr₄ (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

(C₇H₁₁N₂)₂MBr₄ (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission