Intrinsic Luminescence from Nonaromatic Biomolecules

Wang, Yunzhong; Zhao, Zihao; Yuan, Wang Zhang

doi:10.1002/cplu.202000021

Cited by 72 publications

(56 citation statements)

References 141 publications

(225 reference statements)

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“…However, the oxygen is not the only responsible for the emission of the tertiary amine and amide group. One question that was recently addressed in a paper by Zhang et al and Wang et al is how those chemical groups emit photons without having conjugated bonds [10a,b] . One of the reasons is the absence of certain vibrational modes in tertiary amines and amide groups due to the proximity of other groups.…”

Section: Resultsmentioning

confidence: 99%

Experimental Findings about the Fluorescence Emission of Generation 4.0 and 4.5 Polyamidoamine Dendrimers

et al. 2020

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Physicochemical characterization of polyamidoamine (PAMAM) dendrimers of generation 4.0 amine-terminated (DG4.0) and 4.5 carboxy-ended (DG4.5) was done. We have measured the pKa of the inner tertiary amine, the surface primary-amine, and carboxyl-terminal groups. We have conducted UV-Vis absorption and fluorescence emission experiments as a function of pH. We have made a 4th derivative analysis of the UV-Vis absorption experiments and compare the results with classical amide such as dimethylformamide. Our results have permitted us to calculate the pKa of the groups sensible to the pH in both dendrimers and compare the results with theoretical studies. On the one hand, the pKa values found for DG4.0 were 10.0 � 0.5 and 7.1 � 0.2, for primary and tertiary amines groups, respectively. On the other hand, the pKa values found for the DG4.5 were 3.5 � 0.7 and 6.8 � 0.4, for the carboxylic and tertiary amine groups. Our experimental results agree with theoretical ones. We offer probes that the dendrimers have two non-traditional fluorophores, where one of them is the inner amide bond. The dendrimers show fluorescence emission in all the tested pH.

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Section: Resultsmentioning

confidence: 99%

Experimental Findings about the Fluorescence Emission of Generation 4.0 and 4.5 Polyamidoamine Dendrimers

et al. 2020

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“…The emission center was formed by the clustering of carboxyl groups and water molecules with blue photoluminescence which often observed in Natural and synthetic nontraditional luminogens. 5,33,36,40,41 (2) 0 g < KOH < 1.3 g. When KOH was introduced into the system, the carboxyl groups start to deprotonate and water molecules are presented as hydrated hydroxide complexes. The emission center becomes the clustering of partially deprotonated carboxyl groups and hydrated hydroxide complexes with tunable emission wavelength from 430 to 485 nm.…”

Section: Resultsmentioning

confidence: 99%

“…The dynamic property of H 2 O•OH --PBIS makes it susceptible to the microenvironment, especially for the pH condition which provides an avenue for modulating the photoluminescence performance of nontraditional polymeric luminogens. This proposed H 2 O•OH --PBIS model is not only capable for explaining the peculiar optoelectronic properties of nontraditional AIE luminogens, 5,22,36,44 but also provides completely new insights for the understanding of the photoemission process of proteins. [45][46][47]…”

Section: Discussionmentioning

confidence: 99%

“…have received considerable attention due to their fundamental importance, promising applications. 5,6 NT-AIEgens with typical structural features of no traditional chromophores gradually developed into a new type of AIE luminophores, including nature and synthetic small molecules, 7-10 polymers [11][12][13][14][15][16] and metal clusters. [17][18][19][20][21] Among them, nonconjugated polymers, which are free of aromatic building blocks, have been intensively reported due to their unique clustering-triggered emission (CTE).…”

Section: Introductionmentioning

confidence: 99%

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Hydrated Hydroxide Complex Dominates the AIE Property of Nonconjugated Polymeric Luminophores

Yang

Zhou²,

Shan³

et al. 2021

Preprint

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Nontraditional intrinsic luminescence (NTIL) which always accompanied with aggregation-induced emission (AIE) features has received considerable attention due to their importance in the understanding of basic luminescence principle and potential practical applications. However, the rational modulation of the NTIL of nonconventional luminophores remains difficult, on account of the limited understanding of emission mechanisms. Herein, the emission colour of nonconjugated poly(methyl vinyl ether-alt-maleic anhydride) (PMVEMA) could be readily regulated from blue to red by controlling the alkalinity during the hydrolysis process. The nontraditional photoluminescence with AIE property was from the new formed p-band state, resulting from the strong overlapping of p orbitals of the clustered O atoms though space interactions. Hydrated hydroxide complexes embedded in the entangled polymer chain make big difference on the clustering of O atoms which dominates the AIE property of nonconjugated PMVEMA. These new insights into the photoemission mechanism of NTIL should stimulate additional experimental and theoretical studies and could benefit the molecular-level design of nontraditional chromophores for optoelectronics and other applications.

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“…Importantly, these optical features can also arise in sequences devoid of aromatic amino acid residues, 6 , 7 , 13 what suggests that amyloid autofluorescence falls into a general idea of clustering-triggered luminescence observed for various biomolecules and polymers lacking conventional chromophores. 14 , 15 In such systems, through-space conjugation of molecules upon clustering, together with conformational rigidification, results in extended delocalization and observed emission.…”

Section: Introductionmentioning

confidence: 99%

Autofluorescence of Amyloids Determined by Enantiomeric Composition of Peptides

et al. 2021

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Amyloid fibrils are peptide or protein aggregates possessing a cross-β-sheet structure. They possess intrinsic fluorescence property, which is still not fully understood. Herein, we compare structural and optical properties of fibrils formed from L- and D-enantiomers of the (105–115) fragment of transthyretin (TTR) and from their racemic mixture. Our results show that autofluorescence of fibrils obtained from enantiomers differs from that of fibrils from the racemic mixture. In order to elucidate the origin of observed differences, we analyzed the structure and morphology of fibrils and showed how variations in β-sheet organization influence optical properties of fibrils. We clarified the contribution of aromatic rings and the amyloid backbone to the final blue-green emission of fibrils. This work demonstrates how enantiomeric composition of amino acids allows us to modulate the self-assembly and final morphology of well-defined fibrillar bionanostructures with optical properties controlled by supramolecular organization.

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Intrinsic Luminescence from Nonaromatic Biomolecules

Cited by 72 publications

References 141 publications

Experimental Findings about the Fluorescence Emission of Generation 4.0 and 4.5 Polyamidoamine Dendrimers

Experimental Findings about the Fluorescence Emission of Generation 4.0 and 4.5 Polyamidoamine Dendrimers

Hydrated Hydroxide Complex Dominates the AIE Property of Nonconjugated Polymeric Luminophores

Autofluorescence of Amyloids Determined by Enantiomeric Composition of Peptides

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