1
|
Barclay MS, Chowdhury AU, Biaggne A, Huff JS, Wright ND, Davis PH, Li L, Knowlton WB, Yurke B, Pensack RD, Turner DB. Probing DNA structural heterogeneity by identifying conformational subensembles of a bicovalently bound cyanine dye. J Chem Phys 2023; 158:035101. [PMID: 36681650 DOI: 10.1063/5.0131795] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
DNA is a re-configurable, biological information-storage unit, and much remains to be learned about its heterogeneous structural dynamics. For example, while it is known that molecular dyes templated onto DNA exhibit increased photostability, the mechanism by which the structural dynamics of DNA affect the dye photophysics remains unknown. Here, we use femtosecond, two-dimensional electronic spectroscopy measurements of a cyanine dye, Cy5, to probe local conformations in samples of single-stranded DNA (ssDNA-Cy5), double-stranded DNA (dsDNA-Cy5), and Holliday junction DNA (HJ-DNA-Cy5). A line shape analysis of the 2D spectra reveals a strong excitation-emission correlation present in only the dsDNA-Cy5 complex, which is a signature of inhomogeneous broadening. Molecular dynamics simulations support the conclusion that this inhomogeneous broadening arises from a nearly degenerate conformer found only in the dsDNA-Cy5 complex. These insights will support future studies on DNA's structural heterogeneity.
Collapse
Affiliation(s)
- Matthew S Barclay
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Azhad U Chowdhury
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Austin Biaggne
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Jonathan S Huff
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Nicholas D Wright
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Paul H Davis
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Lan Li
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - William B Knowlton
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Bernard Yurke
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Ryan D Pensack
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| | - Daniel B Turner
- Micron School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
| |
Collapse
|
2
|
Barclay M, Huff JS, Pensack RD, Davis PH, Knowlton WB, Yurke B, Dean JC, Arpin PC, Turner DB. Characterizing Mode Anharmonicity and Huang-Rhys Factors Using Models of Femtosecond Coherence Spectra. J Phys Chem Lett 2022; 13:5413-5423. [PMID: 35679146 PMCID: PMC9234982 DOI: 10.1021/acs.jpclett.1c04162] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 06/06/2022] [Indexed: 06/15/2023]
Abstract
Femtosecond laser pulses readily produce coherent quantum beats in transient-absorption spectra. These oscillatory signals often arise from molecular vibrations and therefore may contain information about the excited-state potential energy surface near the Franck-Condon region. Here, by fitting the measured spectra of two laser dyes to microscopic models of femtosecond coherence spectra (FCS) arising from molecular vibrations, we classify coherent quantum-beat signals as fundamentals or overtones and quantify their Huang-Rhys factors and anharmonicity values. We discuss the extracted Huang-Rhys factors in the context of quantum-chemical computations. This work solidifies the use of FCS for analysis of coherent quantum beats arising from molecular vibrations, which will aid studies of molecular aggregates and photosynthetic proteins.
Collapse
Affiliation(s)
- Matthew
S. Barclay
- Micron
School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Jonathan S. Huff
- Micron
School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Ryan D. Pensack
- Micron
School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Paul H. Davis
- Micron
School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - William B. Knowlton
- Micron
School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Department
of Electrical & Computer Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Bernard Yurke
- Micron
School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Department
of Electrical & Computer Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Jacob C. Dean
- Department
of Physical Science, Southern Utah University, Cedar City, Utah 84720, United States
| | - Paul C. Arpin
- Department
of Physics, California State University,
Chico, Chico, California 95929, United States
| | - Daniel B. Turner
- Micron
School for Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| |
Collapse
|
3
|
Camargo FA, Ben-Shahar Y, Nagahara T, Panfil YE, Russo M, Banin U, Cerullo G. Visualizing Ultrafast Electron Transfer Processes in Semiconductor-Metal Hybrid Nanoparticles: Toward Excitonic-Plasmonic Light Harvesting. NANO LETTERS 2021; 21:1461-1468. [PMID: 33481610 PMCID: PMC7883410 DOI: 10.1021/acs.nanolett.0c04614] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Recently, it was demonstrated that charge separation in hybrid metal-semiconductor nanoparticles (HNPs) can be obtained following photoexcitation of either the semiconductor or of the localized surface plasmon resonance (LSPR) of the metal. This suggests the intriguing possibility of photocatalytic systems benefiting from both plasmon and exciton excitation, the main challenge being to outcompete other ultrafast relaxation processes. Here we study CdSe-Au HNPs using ultrafast spectroscopy with high temporal resolution. We describe the complete pathways of electron transfer for both semiconductor and LSPR excitation. In the former, we distinguish hot and band gap electron transfer processes in the first few hundred fs. Excitation of the LSPR reveals an ultrafast (<30 fs) electron transfer to CdSe, followed by back-transfer from the semiconductor to the metal within 210 fs. This study establishes the requirements for utilization of the combined excitonic-plasmonic contribution in HNPs for diverse photocatalytic applications.
Collapse
Affiliation(s)
- Franco
V. A. Camargo
- Dipartimento
di Fisica, IFN-CNR, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan 20133, Italy
| | - Yuval Ben-Shahar
- Institute
of Chemistry and Center for Nanoscience & Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
- Department
of Physical Chemistry, Israel Institute
for Biological Research, P.O. Box 19, Ness-Ziona 74100, Israel
| | - Tetsuhiko Nagahara
- Dipartimento
di Fisica, IFN-CNR, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan 20133, Italy
- Department
of Chemistry and Materials Technology, Kyoto
Institute of Technology, Matsugasaki, Kyoto 6068585, Japan
| | - Yossef E. Panfil
- Institute
of Chemistry and Center for Nanoscience & Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Mattia Russo
- Dipartimento
di Fisica, IFN-CNR, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan 20133, Italy
| | - Uri Banin
- Institute
of Chemistry and Center for Nanoscience & Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Giulio Cerullo
- Dipartimento
di Fisica, IFN-CNR, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan 20133, Italy
| |
Collapse
|