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Bi L, Jamnuch S, Chen A, Do A, Balto KP, Wang Z, Zhu Q, Wang Y, Zhang Y, Tao AR, Pascal TA, Figueroa JS, Li S. Molecular-Scale Visualization of Steric Effects of Ligand Binding to Reconstructed Au(111) Surfaces. J Am Chem Soc 2024; 146:11764-11772. [PMID: 38625675 PMCID: PMC11066864 DOI: 10.1021/jacs.4c00002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 03/28/2024] [Accepted: 03/29/2024] [Indexed: 04/17/2024]
Abstract
Direct imaging of single molecules at nanostructured interfaces is a grand challenge with potential to enable new, precise material architectures and technologies. Of particular interest are the structural morphology and spectroscopic signatures of the adsorbed molecule, where modern probes are only now being developed with the necessary spatial and energetic resolution to provide detailed information at the molecule-surface interface. Here, we directly characterize the adsorption of individual m-terphenyl isocyanide ligands on a reconstructed Au(111) surface through scanning tunneling microscopy and inelastic electron tunneling spectroscopy. The site-dependent steric pressure of the various surface features alters the vibrational fingerprints of the m-terphenyl isocyanides, which are characterized with single-molecule precision through joint experimental and theoretical approaches. This study provides molecular-level insights into the steric-pressure-enabled surface binding selectivity as well as its effect on the chemical properties of individual surface-binding ligands.
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Affiliation(s)
- Liya Bi
- Department
of Chemistry and Biochemistry, University
of California, San Diego, California 92093-0309, United States
- Program
in Materials Science and Engineering, University
of California, San Diego, California 92093-0418, United States
| | - Sasawat Jamnuch
- Department
of Nano and Chemical Engineering, University
of California, San Diego, California 92093-0448, United States
| | - Amanda Chen
- Department
of Nano and Chemical Engineering, University
of California, San Diego, California 92093-0448, United States
| | - Alexandria Do
- Program
in Materials Science and Engineering, University
of California, San Diego, California 92093-0418, United States
- Department
of Nano and Chemical Engineering, University
of California, San Diego, California 92093-0448, United States
| | - Krista P. Balto
- Department
of Chemistry and Biochemistry, University
of California, San Diego, California 92093-0309, United States
| | - Zhe Wang
- Institute
of Fundamental and Frontier Sciences, University
of Electronic Science and Technology of China, Chengdu 611731, China
| | - Qingyi Zhu
- Department
of Chemistry and Biochemistry, University
of California, San Diego, California 92093-0309, United States
| | - Yufei Wang
- Program
in Materials Science and Engineering, University
of California, San Diego, California 92093-0418, United States
- Department
of Nano and Chemical Engineering, University
of California, San Diego, California 92093-0448, United States
| | - Yanning Zhang
- Institute
of Fundamental and Frontier Sciences, University
of Electronic Science and Technology of China, Chengdu 611731, China
| | - Andrea R. Tao
- Department
of Chemistry and Biochemistry, University
of California, San Diego, California 92093-0309, United States
- Program
in Materials Science and Engineering, University
of California, San Diego, California 92093-0418, United States
- Department
of Nano and Chemical Engineering, University
of California, San Diego, California 92093-0448, United States
| | - Tod A. Pascal
- Program
in Materials Science and Engineering, University
of California, San Diego, California 92093-0418, United States
- Department
of Nano and Chemical Engineering, University
of California, San Diego, California 92093-0448, United States
| | - Joshua S. Figueroa
- Department
of Chemistry and Biochemistry, University
of California, San Diego, California 92093-0309, United States
- Program
in Materials Science and Engineering, University
of California, San Diego, California 92093-0418, United States
| | - Shaowei Li
- Department
of Chemistry and Biochemistry, University
of California, San Diego, California 92093-0309, United States
- Program
in Materials Science and Engineering, University
of California, San Diego, California 92093-0418, United States
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Kim Y, Ji S, Nam JM. A Chemist's View on Electronic and Steric Effects of Surface Ligands on Plasmonic Metal Nanostructures. Acc Chem Res 2023; 56:2139-2150. [PMID: 37522593 DOI: 10.1021/acs.accounts.3c00196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
ConspectusPlasmonic metal nanostructures have been extensively developed over the past few decades because of their ability to confine light within the surfaces and manipulate strong light-matter interactions. The light energy stored by plasmonic nanomaterials in the form of surface plasmons can be utilized to initiate chemical reactions, so-called plasmon-induced catalysis, which stresses the importance of understanding the surface chemistry of the plasmonic materials. Nevertheless, only physical interpretation of plasmonic behaviors has been a dominant theme, largely excluding chemical intuitions that facilitate understanding of plasmonic systems from molecular perspectives. To overcome and address the lack of this complementary understanding based on molecular viewpoints, in this Account we provide a new concept encompassing the well-developed physics of plasmonics and the corresponding surface chemistry while reviewing and discussing related references. Inspired by Roald Hoffmann's descriptions of solid-state surfaces based on the molecular orbital picture, we treat molecular interfaces of plasmonic metal nanostructures as a series of metal-ligand complexes. Accordingly, the effects of the surface ligands can be described by bisecting them into electronic and steric contributions to the systems. By exploration of the quality of orbital overlaps and the symmetry of the plasmonic systems, electronic effects of surface ligands on localized surface plasmon resonances (LSPRs), surface diffusion rates, and hot-carrier transfer mechanisms are investigated. Specifically, the propensity of ligands to donate electrons in a σ-bonding manner can change the LSPR by shifting the density of states near the Fermi level, whereas other types of ligands donating or accepting electrons in a π-bonding manner modulate surface diffusion rates by affecting the metal-metal bond strength. In addition, the formation of metal-ligand bonds facilitates direct hot-carrier transfer by forming a sort of molecular orbital between a plasmonic structure and ligands. Furthermore, effects of steric environments are discussed in terms of ligand-ligand and ligand-surface nonbonding interactions. The steric hindrance allows for controlling the accessibility of the surrounding chemical species toward the metal surface by modulating the packing density of ligands and generating repulsive interactions with the surface atoms. This unconventional approach of considering the plasmonic system as a delocalized molecular entity could establish a basis for integrating chemical intuition with physical phenomena. Our chemist's outlook on a molecular interface of the plasmonic surface can provide insights and avenues for the design and development of more exquisite plasmonic catalysts with regio- and enantioselectivities as well as advanced sensors with unprecedented chemical controllability and specificity.
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Affiliation(s)
- Yoonhee Kim
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Soohyun Ji
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Jwa-Min Nam
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
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Abstract
A significant challenge in the development of functional materials is understanding the growth and transformations of anisotropic colloidal metal nanocrystals. Theory and simulations can aid in the development and understanding of anisotropic nanocrystal syntheses. The focus of this review is on how results from first-principles calculations and classical techniques, such as Monte Carlo and molecular dynamics simulations, have been integrated into multiscale theoretical predictions useful in understanding shape-selective nanocrystal syntheses. Also, examples are discussed in which machine learning has been useful in this field. There are many areas at the frontier in condensed matter theory and simulation that are or could be beneficial in this area and these prospects for future progress are discussed.
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Affiliation(s)
- Kristen A Fichthorn
- Department of Chemical Engineering and Department of Physics The Pennsylvania State University University Park, Pennsylvania 16803 United States
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Greytak AB, Abiodun SL, Burrell JM, Cook EN, Jayaweera NP, Islam MM, Shaker AE. Thermodynamics of nanocrystal–ligand binding through isothermal titration calorimetry. Chem Commun (Camb) 2022; 58:13037-13058. [DOI: 10.1039/d2cc05012a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Manipulations of nanocrystal (NC) surfaces have propelled the applications of colloidal NCs across various fields such as bioimaging, catalysis, electronics, and sensing applications.
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Affiliation(s)
- Andrew B. Greytak
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Sakiru L. Abiodun
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Jennii M. Burrell
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Emily N. Cook
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Nuwanthaka P. Jayaweera
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Md Moinul Islam
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Abdulla E Shaker
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
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