Nanoscale, Год журнала: 2024, Номер unknown
Опубликована: Янв. 1, 2024
Silver cluster–DNA conjugates catalyze alkyne–azide cycloadditions. The catalytic activity of the cluster is regulated by DNA host.
Язык: Английский
Advanced Optical Materials, Год журнала: 2024, Номер 12(19)
Опубликована: Май 11, 2024
Abstract DNA‐stabilized silver nanoclusters (DNA‐AgNCs) are a class of emitters that have primarily been studied for their molecular‐like photophysical properties with ns‐lived fluorescence. However, µs‐lived luminescence has recently reported an increasing number DNA‐AgNCs, but little is still known about the origin long‐lived emission. To deepen understanding state, (DNA) 2 ‐[Ag 11 ] 7+ , emitter short‐ and dual emission, studied. By examining crystals it found fluorescence transitions orthogonal to each other, which implies components long axis AgNC, such as nucleobases, contribute significantly polarization character luminescent state. The effect hydration level on emission dried droplets also investigated, water drastically reduces from state causes redshift Finally, unusual excitation intensity‐dependent response noticed. This ascribed heterogeneous local environment amorphous solid resulting in different conformations optically activated delayed probabilities. presented results provide new key insights into nature DNA‐AgNCs.
Язык: Английский
Процитировано
6
Advanced Optical Materials, Год журнала: 2025, Номер unknown
Опубликована: Янв. 16, 2025
Abstract DNA‐stabilized silver nanoclusters (DNA‐Ag N ) are atomically precise and sequence‐tuned nanomaterials with potential applications for deep tissue biomedical imaging. Here, a dual‐emissive DNA‐Ag is presented fluorescence in the first near‐infrared (NIR‐I) spectral window microsecond‐lived photoluminescence second (NIR‐II) window. High‐resolution electrospray ionization mass spectrometry showed that emitter has molecular formula (DNA) 2 [Ag 17 ] 11+ . The crystallization of was unsuccessful, which prevented use X‐ray diffraction to determine its structure. However, sequence variations templating DNA oligomer provided insights into nucleobases critical stabilizing Ag Moreover, addition an adenosine or thymidine at 5′‐end strand maintained composition photophysical properties , suggesting site conjugation biomolecules enable targeted labeling future bioimaging applications.
Язык: Английский
Процитировано
0
ACS Omega, Год журнала: 2025, Номер unknown
Опубликована: Фев. 19, 2025
DNA-stabilized silver nanoclusters (DNA-AgNCs) are a class of fluorophores with interesting photophysical properties. They capable generating anti-Stokes fluorescence upon excitation near-infrared lasers. The has previously been speculated to be either the result consecutive photon absorption (upconversion) or hot band (HBA). Here, we revisit DNA-AgNCs determine underlying mechanistic origin. We investigate two studied together organic and emission features in same spectral regions as DNA-AgNCs. From recorded spectra, find that all emitters exhibit an exponential-like decaying slope on red side lowest energy band. Furthermore, power dependency measurements at different wavelengths verify one-photon nature fluorescence. Ultimately, lack discrete optical transition spectra suggests HBA mechanism is most plausible cause for investigated
Язык: Английский
Процитировано
0
ChemPhotoChem, Год журнала: 2024, Номер 8(9)
Опубликована: Апрель 22, 2024
Abstract A case study, detailing the effect of different DNA oligomers on a NIR‐emitting DNA‐stabilized silver nanocluster (DNA‐AgNC), is reported. The presence single‐stranded was found to adversely affect chemical stability (DNA) 2 [Ag 16 Cl ] 8+ with distinct degrees destruction depending sequence. To increase DNA‐AgNC, we implemented two protection strategies. First, hybridization bare strands corresponding complementary sequences dramatically reduced , as demonstrated by decreased drops in both absorption and emission spectra. Secondly, saturation free cations left intact. Our investigation can thus provide an easy‐to‐implement approach discover that are intrinsically less reactive towards preformed DNA‐AgNCs, give idea how protect DNA‐AgNCs from strands.
Язык: Английский
Процитировано
3
Nano Letters, Год журнала: 2024, Номер 24(26), С. 7987 - 7991
Опубликована: Июнь 21, 2024
DNA-stabilized silver nanoclusters (DNA-AgNCs) are a class of fluorophores with interesting photophysical properties dominated by the choice DNA sequence. Screening methods ultraviolet excitation and steady state well plate readers have previously been used for deepening understanding between sequence emission color resulting DNA-AgNCs. Here, we present new method screening DNA-AgNCs using pulsed white light (λ
Язык: Английский
Процитировано
2
ACS Omega, Год журнала: 2024, Номер 9(47), С. 47248 - 47253
Опубликована: Ноя. 12, 2024
DNA-stabilized silver nanoclusters (DNA-AgNCs) are atomically precise emitters, whose chemical stability is commonly defined by their stable optical response over time. Here, two isotopically pure versions (107Ag and 109Ag) of DNA2-[Ag16Cl2]8+ were mixed, we demonstrate for the first time DNA-AgNCs that atoms continuously exchanged between individual clusters. This atom exchange was monitored time-resolved mass spectrometry. Depending on temperature, happens a scale minutes to hours, while retains its ensemble spectroscopic features. Based constants available crystal structure, hypothesized following mechanism: formation transient dimers followed entities. A further slower swapped Ag within rest clusters occurs at much scale. Our findings shed new light meaning this class fluorophores show these systems can be structurally dynamic molecular level, maintaining properties. results also explain why good sensors, as nature allows competing interactions, altering response.
Язык: Английский
Процитировано
1
Nanoscale, Год журнала: 2024, Номер unknown
Опубликована: Янв. 1, 2024
Silver cluster–DNA conjugates catalyze alkyne–azide cycloadditions. The catalytic activity of the cluster is regulated by DNA host.
Язык: Английский
Процитировано
0