1
|
Franco VG, Rodríguez SJ, Calaza FC, Passeggi MCG, Ruano GD. Novel mixed self-assembled monolayers of L-cysteine and methanol on gold surfaces under ambient conditions. NANOSCALE 2024; 16:15366-15380. [PMID: 39091174 DOI: 10.1039/d4nr01848f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
In this work, we carried out an experimental and theoretical study on the formation of self-assembled monolayers of L-cysteine molecules on gold surfaces in the presence of methanol as a solvent. We report for the first time L-cysteine and methanol ordered structures forming a mixed self-assembled mono-layer on Au(100) surfaces under ambient conditions. Finger-like ordered structures with a relative height of 0.10-0.20 nm, average width of 2.0 nm and variable lengths were observed using scanning tunneling microscopy under room temperature and ambient pressure conditions. Using X-ray photoemission spectroscopy, it was determined that L-cysteine molecules bind to the gold surface through the sulfur atom of their thiol group in two molecular configurations: neutral and zwitterionic. We found that the finger-like structures are the result of complex interactions of L-cysteine molecules with gold surfaces and L-cysteine molecules with methanol molecules and among all three components of the system (L-cysteine + methanol + gold surfaces). These interactions were detected through attenuated total reflectance-Fourier transform infrared spectroscopy. Furthermore, adsorbate/substrate interactions were studied by employing ab initio calculations using density functional theory, resulting in molecular arrangements formed by chains of L-cysteine pairs surrounded by physisorbed methanol molecules.
Collapse
Affiliation(s)
- Vanina Gisela Franco
- Instituto de Física del Litoral (IFIS Litoral), Consejo Nacional de Investigaciones Científicas y Técnicas and Universidad Nacional del Litoral (CONICET-UNL), Güemes 3450, (3000) Santa Fe, Argentina.
- Facultad de Ingeniería Química (FIQ), Universidad Nacional del Litoral (UNL), Santiago del Estero 2829, (3000) Santa Fe, Argentina
| | - Sindy Julieth Rodríguez
- Instituto de Física del Litoral (IFIS Litoral), Consejo Nacional de Investigaciones Científicas y Técnicas and Universidad Nacional del Litoral (CONICET-UNL), Güemes 3450, (3000) Santa Fe, Argentina.
| | - Florencia Carolina Calaza
- Facultad de Ingeniería Química (FIQ), Universidad Nacional del Litoral (UNL), Santiago del Estero 2829, (3000) Santa Fe, Argentina
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), Consejo Nacional de Investigaciones Científicas y Técnicas and Universidad Nacional del Litoral (CONICET-UNL), Güemes 3450, (3000) Santa Fe, Argentina
| | - Mario César Guillermo Passeggi
- Instituto de Física del Litoral (IFIS Litoral), Consejo Nacional de Investigaciones Científicas y Técnicas and Universidad Nacional del Litoral (CONICET-UNL), Güemes 3450, (3000) Santa Fe, Argentina.
- Facultad de Ingeniería Química (FIQ), Universidad Nacional del Litoral (UNL), Santiago del Estero 2829, (3000) Santa Fe, Argentina
| | - Gustavo Daniel Ruano
- Centro Atómico Bariloche (CAB), Comisión Nacional de Energía Atómica (CNEA), Av. Exequiel Bustillo 9500, (8400) San Carlos de Bariloche, Argentina
| |
Collapse
|
2
|
Shao F, Zheng L, Lan J, Zenobi R. Nanoscale Chemical Imaging of Coadsorbed Thiolate Self-Assembled Monolayers on Au(111) by Tip-Enhanced Raman Spectroscopy. Anal Chem 2022; 94:1645-1653. [DOI: 10.1021/acs.analchem.1c03968] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Feng Shao
- Department of Physics and Astronomy, National Graphene Institute, University of Manchester, Manchester M13 9PL, U.K
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Liqing Zheng
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Jinggang Lan
- Department of Chemistry, University of Zurich, 8057 Zurich, Switzerland
| | - Renato Zenobi
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| |
Collapse
|
3
|
Molecular Simulation Study of Gold Clusters for Transporting of Thioguanine Anticancer Drug in Aqueous Solution. J CLUST SCI 2022. [DOI: 10.1007/s10876-020-01974-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
4
|
Engelbrekt C, Nazmutdinov RR, Shermukhamedov S, Ulstrup J, Zinkicheva TT, Xiao X. Complex single‐molecule and molecular scale entities in electrochemical environments: Mechanisms and challenges. ELECTROCHEMICAL SCIENCE ADVANCES 2021. [DOI: 10.1002/elsa.202100157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Christian Engelbrekt
- Department of Chemistry Technical University of Denmark Building 207, DK0‐2800 Kgs. Lyngby Denmark
| | - Renat R. Nazmutdinov
- Department of Inorganic Chemistry Kazan National Research Technological University Karl Marx Str. 68 Kazan 420015 Russian Federation
| | - Shokirbek Shermukhamedov
- Department of Inorganic Chemistry Kazan National Research Technological University Karl Marx Str. 68 Kazan 420015 Russian Federation
| | - Jens Ulstrup
- Department of Chemistry Technical University of Denmark Building 207, DK0‐2800 Kgs. Lyngby Denmark
| | - Tamara T. Zinkicheva
- Department of Inorganic Chemistry Kazan National Research Technological University Karl Marx Str. 68 Kazan 420015 Russian Federation
| | - Xinxin Xiao
- Department of Chemistry Technical University of Denmark Building 207, DK0‐2800 Kgs. Lyngby Denmark
| |
Collapse
|
5
|
Gharabekyan HH, Koetz J, Poghosyan AH. A protonated L-cysteine adsorption on gold surface: A molecular dynamics study. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
6
|
Yadav S, Springborg M, Singhal S, Molayem M, Goel N. Mechanistic Details and Conformational Behavior of Selective Peptide Linkage Facilitated by Au nClusters. ChemistrySelect 2020. [DOI: 10.1002/slct.202001564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sarita Yadav
- Theoretical and Computational Chemistry Group Department of Chemistry Centre of Advanced Studies in Chemistry Panjab University Chandigarh 160014 India
| | - Michael Springborg
- Physical and Theoretical Chemistry University of Saarland Saarbrücken Germany
- School of Materials Science and Engineering Tianjin University Tianjin 300072 China
| | - Sonal Singhal
- Theoretical and Computational Chemistry Group Department of Chemistry Centre of Advanced Studies in Chemistry Panjab University Chandigarh 160014 India
| | - Mohammad Molayem
- Physical and Theoretical Chemistry University of Saarland Saarbrücken Germany
| | - Neetu Goel
- Theoretical and Computational Chemistry Group Department of Chemistry Centre of Advanced Studies in Chemistry Panjab University Chandigarh 160014 India
| |
Collapse
|
7
|
Nhat PV, Nguyen PTN, Si NT. A computational study of thiol-containing cysteine amino acid binding to Au 6 and Au 8 gold clusters. J Mol Model 2020; 26:58. [PMID: 32055987 DOI: 10.1007/s00894-020-4312-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 01/27/2020] [Indexed: 12/23/2022]
Abstract
Density functional theory (DFT) calculations are employed to examine the adsorption behaviors of cysteine on the gold surface using Au6 and Au8 species as model reactants. Computed results show that cysteine molecules prefer to bind with gold clusters via the S-atom of the thiol group in vacuum and thiolate group in water. The gas-phase adsorption energies are around 20.2 kcal/mol for Au6 and 24.4 kcal/mol for Au8. In water environment, such values are slightly reduced for Au6 (19.6 kcal/mol), but increased a little more for Au8 (25.6 kcal/mol). As a result, if a visible light with a frequency of ν ≈ 6 × 1014 Hz (500 nm) is applied, the time for the recovery of Au6 and Au8 from the most stable complexes will be about 0.38 and 9.3 × 103 s, respectively, at 298 K in water. The Au6 is in addition found to benefit from a larger change of energy gap that could be converted to an electrical signal for detection of cysteine.
Collapse
Affiliation(s)
- Pham Vu Nhat
- Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - Pham Tran Nguyen Nguyen
- Institute for Computational Science and Technology, Ho Chi Minh City, Vietnam
- Computational Chemistry Lab, Faculty of Chemistry, VNUHCM-University of Sciences, Ho Chi Minh City, Vietnam
| | - Nguyen Thanh Si
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, 700000, Vietnam.
- Computational Chemistry Research Group, Ton Duc Thang University, Ho Chi Minh City, 700000, Vietnam.
| |
Collapse
|
8
|
Engelbrekt C, Nazmutdinov RR, Zinkicheva TT, Glukhov DV, Yan J, Mao B, Ulstrup J, Zhang J. Chemistry of cysteine assembly on Au(100): electrochemistry, in situ STM and molecular modeling. NANOSCALE 2019; 11:17235-17251. [PMID: 31418761 DOI: 10.1039/c9nr02477h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Cysteine (Cys) is an essential amino acid with a carboxylic acid, an amine and a thiol group. We have studied the surface structure and adsorption dynamics of l-cysteine adlayers on Au(100) from aqueous solution using electrochemistry, high-resolution electrochemical scanning tunnelling microscopy (in situ STM), and molecular modelling. Cys adsorption on this low-index Au-surface has been much less studied than Cys adsorption on Au(111)- and Au(110)-electrode surfaces. Chronopotentiometry was employed to monitor the adsorption dynamics at sub-second resolution and showed that adsorption is completed in 30 minutes at Cys concentrations above 100 μM. Two consecutive steps could be fitted to these data. Two separate reductive desorption peaks of Cys adlayers on Au(100) with a total coverage of 2.52 (±0.15) × 10-10 mol cm-2 were observed. In situ STM showed that the adsorbed Cys is organized in stripes with "fork-like" features which co-exist in (11 × 2)-2Cys and (7 × 2)-2Cys lattices, quite differently from Cys adsorption on Au(111)-electrode surfaces. Stripe structures with bright STM contrast in the center suggest that a second Cys adlayer on top of a first adlayer is formed, supporting the dual-peak reductive desorption of Cys adlayers. In addition, monolayers of both pure l-Cys and pure d-Cys and a 1 : 1 racemic mixture of l- and d-Cys on Au(100) were studied. Virtually identical macroscopic electrochemical features were found, but in situ STM discloses many more defects for the racemic mixture than for the pure enantiomers due to structural mismatch of l- and d-Cys. Density functional theory (DFT) calculations combined with a cluster model for the Au(100) surface were carried out to investigate the adsorption energy and geometry of the adsorbed monomer and dimer Cys species in different orientations, with detailed attention to the chirality effects. Optimized DFT geometries were used to construct model STM images, and kinetic Monte Carlo simulations undertaken to illuminate the growth of adsorbate rows and the mechanism of the adlayer formation as well as the Cys adsorption patterns specific to the Au(100)-electrode surface.
Collapse
Affiliation(s)
- Christian Engelbrekt
- Department of Chemistry, Building 207, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Dourado AHB, Pastrián FC, Torresi SICDE. The long and successful journey of electrochemically active amino acids. From fundamental adsorption studies to potential surface engineering tools. AN ACAD BRAS CIENC 2018; 90:607-630. [PMID: 29340478 DOI: 10.1590/0001-3765201720170434] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 07/26/2017] [Indexed: 12/11/2022] Open
Abstract
Proteins have been the subject of electrochemical studies. It is possible to apply electrochemical techniques to obtain information about their structure due to the presence of five electroactive amino acids that can be oriented to the outside of the peptidic chain. These amino acids are L-Tryptophan (L-Trp), L-Tyrosine (L-Tyr), L-Histidine (L-His), L-Methionine (L-Met) and L-Cysteine (L-Cys); their electrochemical behavior being subject of extensive research, but it is still controversial. No spectroscopic investigations have been reported on L-Trp, and due to the short life time of the intermediates, ex situ techniques cannot be employed, leading to a never-ending discussion about possible intermediates. In the L-Tyr and L-His cases, spectroelectrochemical studies were performed and different intermediates were observed, suggesting that some intermediates may be observed under specific conditions, as proposed for L-Cys. This amino acid is the most interesting among the electroactive ones because of the presence of a thiol moiety at its side chain, leading to a wide range of oxidation states. It can adsorb onto surfaces of different crystallographic orientation in stereoselective conformation, modifying the surface for different applications.as a surface engineering tool since it plays the role of as an anchor for the growing of nanocrystals inside proteic templates.
Collapse
Affiliation(s)
- André H B Dourado
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Fabián C Pastrián
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Susana I Córdoba DE Torresi
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| |
Collapse
|
10
|
Wang C, Luo X, Jia Z. Linkage, charge state and layer of L-Cysteine on copper surfaces. Colloids Surf B Biointerfaces 2017; 160:33-39. [PMID: 28915499 DOI: 10.1016/j.colsurfb.2017.09.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 08/24/2017] [Accepted: 09/06/2017] [Indexed: 11/17/2022]
Abstract
The control of linkage and charge state between biomolecules and metals represents a key issue for the architect of bioactive systems. In this paper, the linkage, charge state and layer of L-Cysteine (L-Cys) self-assembled films were handled on copper surfaces at pH=6.86. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed to measure the film quality and the details of self-assembled progress. X-ray photoelectron spectroscopy (XPS) and quantum chemical calculations of density functional theory (DFT) were used to characterize the linkage, charge state and layer of the L-Cys molecules on copper surfaces. The results indicate that, from 0s to 24h, the self-assembled process can be classified as three steps, fast adsorption at the beginning, and then rearrangement to form a monolayer, and then the formation of double layer. And L-Cys molecules link to the copper surface through CuS bond, not CuN bond. The thickness of monolayer is 10.5Å. Then the L-Cys molecules of second layer recline on the first layer. Finally, by the interaction of amine group and carboxylic acid group between the two layers, the second self-assembled film stands uprightly, and the -S- group of the second layer point outward. The thickness of the double layer is 19.7Å. All the Cu/L-Cys films have negative charges because the pH (6.86) of the self-assembled solution is more than the isoelectric point of the L-Cys (5.05).
Collapse
Affiliation(s)
- Chuntao Wang
- Department of Chemistry, Taiyuan Normal University, Jinzhong, 030619, PR China; Institute of Energy and Environmental Electrochemistry, Taiyuan Normal University, Jinzhong, 030619, PR China.
| | - Xiaoxiao Luo
- Stuart School of Business, Illinois Institute of Technology, Chicago, 60661-3061,USA
| | - Zehui Jia
- Department of Chemistry, Taiyuan Normal University, Jinzhong, 030619, PR China; Institute of Energy and Environmental Electrochemistry, Taiyuan Normal University, Jinzhong, 030619, PR China
| |
Collapse
|
11
|
Srivastava R. Interaction of Cysteine with Au
n
(n
=8, 10, 12) Even Neutral Clusters: A Theoretical Study. ChemistrySelect 2017. [DOI: 10.1002/slct.201700041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Ruby Srivastava
- Center for Molecular Modelling; CSIR-Indian Institute of Chemical Technology; Hyderabad- 50060 India
| |
Collapse
|
12
|
Lazarescu V, Toader AM, Enache M, Preda L, Anastasescu M, Dobrescu G, Negrila C, Lazarescu MF. Field - dipole interactions in L-cysteine-thiolate self assembled at p- and n-GaAs(100) electrodes. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.06.121] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
13
|
Salvatore P, Nazmutdinov RR, Ulstrup J, Zhang J. DNA Bases Assembled on the Au(110)/Electrolyte Interface: A Combined Experimental and Theoretical Study. J Phys Chem B 2015; 119:3123-34. [DOI: 10.1021/jp511909f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Princia Salvatore
- Department
of Chemistry, Building 207, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Renat R. Nazmutdinov
- Kazan National
Research Technological University, K. Marx Str., 68, 420015 Kazan, Republic of Tatarstan, Russian Federation
| | - Jens Ulstrup
- Department
of Chemistry, Building 207, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Jingdong Zhang
- Department
of Chemistry, Building 207, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| |
Collapse
|
14
|
Interface Electronic Structures of the L-Cysteine on Noble Metal Surfaces Studied by Ultraviolet Photoelectron Spectroscopy. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2015. [DOI: 10.1380/ejssnt.2015.373] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
15
|
Gogoi N, Chowdhury D. Fragmentation of supported gold nanoparticles@agarose film by thiols and the role of their synergy in efficient catalysis. RSC Adv 2015. [DOI: 10.1039/c5ra19567e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A non-conventional fragmentation of supported gold nanoparticles@agarose film by thiols through a prompt electron transfer is demonstrated. The film also shows catalysis of p-nitrophenol reduction in only ∼20 to 30 s.
Collapse
Affiliation(s)
- Neelam Gogoi
- Material Nanochemistry Laboratory
- Physical Sciences Division
- Institute of Advanced Study in Science and Technology
- Guwahati
- India
| | - Devasish Chowdhury
- Material Nanochemistry Laboratory
- Physical Sciences Division
- Institute of Advanced Study in Science and Technology
- Guwahati
- India
| |
Collapse
|
16
|
Fajín JLC, Gomes JRB, Cordeiro MNDS. DFT study of the adsorption of D-(L-)cysteine on flat and chiral stepped gold surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8856-64. [PMID: 23772917 DOI: 10.1021/la401057f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The adsorption of cysteine onto the intrinsically chiral gold surface, Au(321)(R,S), was investigated by means of a periodic supercell density functional theory approach. The results are compared to those obtained at the same level of theory with a nonchiral surface having the same terrace orientation, the Au(111) surface. Neutral and zwitterionic cysteine forms of the L and D enantiomers are considered, as are surface coverage effects. It was found that at high coverage the zwitterionic forms of L- and D-cysteine are more stable on the Au(321)(R,S) faces of the stepped surface and also on the flat Au(111) surface, leading to highly organized cysteine monolayers. However, at low coverage the adsorption of cysteine dimers, with the pairs interacting through their carbonyl groups, is more favorable than or at least equally favorable to the adsorption of single cysteine molecules on both surfaces. A comparison between the cysteine adsorption on the two different surface structures shows that the adsorption on the stepped surface is clearly more favorable than on the flat surface, revealing the importance of the low-coordinated gold atoms in the adsorption of these species. Furthermore, non-negligible differences between the adsorption energy of the enantiomers of cysteine were found both at high and low coverage, thus showing the enantiospecificity of this intrinsically chiral surface regarding cysteine adsorption. This adsorption occurs with the cysteine binding the surface through only one contact point (by its sulfur atom), in contrast to previous work where the enantiospecific adsorption of cysteine has been related to two nonequivalent binding sites of the cysteine enantiomers with the surface.
Collapse
Affiliation(s)
- José L C Fajín
- REQUIMTE, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | | | | |
Collapse
|
17
|
Zhao Y, Zhou F, Zhou H, Su H. The structural and bonding evolution in cysteine–gold cluster complexes. Phys Chem Chem Phys 2013; 15:1690-8. [DOI: 10.1039/c2cp42830j] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
18
|
Riaz S, Ma W, Jing C, Nawaz MH, Li DW, Long YT. Thiol-ubiquinone assisted fragmentation of gold nanoparticles. Chem Commun (Camb) 2013; 49:1738-40. [DOI: 10.1039/c3cc38398a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
19
|
Caprile L, Cossaro A, Falletta E, Della Pina C, Cavalleri O, Rolandi R, Terreni S, Ferrando R, Rossi M, Floreano L, Canepa M. Interaction of L-cysteine with naked gold nanoparticles supported on HOPG: a high resolution XPS investigation. NANOSCALE 2012; 4:7727-7734. [PMID: 23135640 DOI: 10.1039/c2nr32741d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report the results of a synchrotron-based high-resolution XPS study of the interaction of L-cysteine (Cys) with well-characterized colloidal gold nanoparticles (NPs, typical size 3-4 nm), which were pre-deposited on highly oriented pyrolytic graphite and then brought into contact with the aqueous solution of Cys by drop-casting. By comparison with data previously obtained for Cys deposition on flat Au substrates (single crystals and high quality films), we demonstrate the formation of a strong Cys/NP thiolate bond. The analysis of the line shape and adsorbate-induced Au 4f core level shift, backed by simulations of the NP structure, reveals the interaction of Cys with low-coordinated Au atoms belonging to the NP edge and corners. The analysis of the N 1s core-level indicates that neutral molecules are the most abundant species. The small facet size limits the formation of extended networks of zwitterionic molecules, typical of single crystal surfaces. This study provides a spectroscopic insight into the intense poisoning effect caused by a limited amount of Cys on Au catalysts described in previous reports.
Collapse
Affiliation(s)
- Laura Caprile
- CNISM and Dipartimento di Fisica, Universitá di Genova, via Dodecaneso 33, Genova, Italy
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Luque NB, Santos E. Ab initio studies of Ag-S bond formation during the adsorption of L-cysteine on Ag(111). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11472-11480. [PMID: 22799749 DOI: 10.1021/la302376w] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ab initio studies of Ag-S bond formation during the adsorption of L-cysteine on Ag(111) have been performed by combining density functional theory with a quantum mechanical model developed in our group. The adsorbate-silver bond formation has been investigated by analyzing the projected density of states onto the different atoms of the molecule and by charge density difference calculations when the zwitterion radical approaches the surface. The polar character of the bond can be distinguished. For the first time, the coupling constants of the sulfur orbitals with the d and sp bands have been calculated by fitting the density of states. The role of the sp bands in the stabilization of the sulfur-silver bond is analyzed. The differences with the catalysis of hydrogen adsorption are discussed. Copper, gold, and silver are not good catalysts for the adsorption of hydrogen because of the position of the d bands lying too far below the Fermi level. However, the coin metals are excellent for the adsorption of thiols. The reason is that at the equilibrium position the sulfur atom is much farther from the surface than hydrogen, and thus the interactions with the sp bands stabilize its bond to the surface.
Collapse
Affiliation(s)
- N B Luque
- Institute of Theoretical Chemistry, Ulm University, Ulm, Germany
| | | |
Collapse
|
21
|
Abraham A, Ilott AJ, Miller J, Gullion T. 1H MAS NMR Study of Cysteine-Coated Gold Nanoparticles. J Phys Chem B 2012; 116:7771-5. [PMID: 22708845 DOI: 10.1021/jp3011298] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anuji Abraham
- Department of Chemistry, West Virginia University, Morgantown,
West Virginia 26506, United States
| | - Andrew J. Ilott
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York
11794, United States
| | - Joel Miller
- Chemistry Division, Naval Research Laboratory, Code 6122,
Washington, DC 20375, United States
| | - Terry Gullion
- Department of Chemistry, West Virginia University, Morgantown,
West Virginia 26506, United States
| |
Collapse
|
22
|
Luque NB, Vélez P, Pötting K, Santos E. Ab initio studies of the electronic structure of L-cysteine adsorbed on Ag(111). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8084-8099. [PMID: 22568393 DOI: 10.1021/la301107k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have performed ab initio calculations for the adsorption of L-cysteine on Ag(111) using density functional theory. We have focused on two possible adsorbed species: the L-cysteine radical (•S-CH(2)-CH-NH(2)-COOH) adsorbed almost flat at a bridge site, slightly displaced toward an fcc location, and the zwitterionic radical Z-cysteine (•S-CH(2)-CH-NH(3)(+)-COO(-)) adsorbed at a bridge site, shifted to a hcp site forming a (4 × 4) unit cell (θ = 0.06) and a (√3 × √3) R 30° unit cell (θ = 0.33), respectively. Special attention has been paid to the electronic structure of the system. The adsorbate-silver bond formation has been exhaustively investigated by analyzing the density of states projected onto the different atoms of the molecule, and by charge density difference calculations. A complicated interplay between sp and d states of silver in the formation of bonds between the adsorbates and the surface has been found. The role of the carboxyl group in the interaction with the surface has been also analyzed.
Collapse
Affiliation(s)
- N B Luque
- Instituto de Física Enrique Gaviola (IFEG-CONICET), Faculdad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, Córdoba, Argentina
| | | | | | | |
Collapse
|
23
|
Nazmutdinov RR, Bronshtein MD, Zinkicheva TT, Chi Q, Zhang J, Ulstrup J. Modeling and computations of the intramolecular electron transfer process in the two-heme protein cytochrome c(4). Phys Chem Chem Phys 2012; 14:5953-65. [PMID: 22430606 DOI: 10.1039/c2cp24084j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The di-heme protein Pseudomonas stutzeri cytochrome c(4) (cyt c(4)) has emerged as a useful model for studying long-range protein electron transfer (ET). Recent experimental observations have shown a dramatically different pattern of intramolecular ET between the two heme groups in different local environments. Intramolecular ET in homogeneous solution is too slow (>10 s) to be detected but fast (ms-μs) intramolecular ET in an electrochemical environment has recently been achieved by controlling the molecular orientation of the protein assembled on a gold electrode surface. In this work we have performed computational modeling of the intramolecular ET process by a combination of density functional theory (DFT) and quantum mechanical charge transfer theory to disclose reasons for this difference. We first address the electronic structures of the model heme core with histidine and methionine axial ligands in both low- and high-spin states by structure-optimized DFT. The computations enable estimating the intramolecular reorganization energy of the ET process for different combinations of low- and high-spin heme couples. Environmental reorganization free energies, work terms ("gating") and driving force were determined using dielectric continuum models. We then calculated the electronic transmission coefficient of the intramolecular ET rate using perturbation theory combined with the electronic wave functions determined by the DFT calculations for different heme group orientations and Fe-Fe separations. The reactivity of low- and high-spin heme groups was notably different. The ET rate is exceedingly low for the crystallographic equilibrium orientation but increases by several orders of magnitude for thermally accessible non-equilibrium configurations. Deprotonation of the propionate carboxyl group was also found to enhance the ET rate significantly. The results are discussed in relation to the observed surface immobilization effect and support the notion of conformationally gated ET.
Collapse
Affiliation(s)
- Renat R Nazmutdinov
- Kazan National Research Technological University, 420015 Kazan, Republic Tatarstan, Russian Federation
| | | | | | | | | | | |
Collapse
|
24
|
Xu LP, Liu Y, Zhang X. Interfacial self-assembly of amino acids and peptides: scanning tunneling microscopy investigation. NANOSCALE 2011; 3:4901-4915. [PMID: 22057641 DOI: 10.1039/c1nr11070e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Proteins play important roles in human daily life. To take advantage of the lessons learned from nature, it is essential to investigate the self-assembly of subunits of proteins, i.e., amino acids and polypeptides. Due to its high resolution and versatility of working environment, scanning tunneling microscopy (STM) has become a powerful tool for studying interfacial molecular assembly structures. This review is intended to reflect the progress in studying interfacial self-assembly of amino acids and peptides by STM. In particular, we focus on environment-induced polymorphism, chiral recognition, and coadsorption behavior with molecular templates. These studies would be highly beneficial to research endeavors exploring the mechanism and nanoscale-controlling molecular assemblies of amino acids and polypeptides on surfaces, understanding the origin of life, unravelling the essence of disease at the molecular level and deeming what is necessary for the "bottom-up" nanofabrication of molecular devices and biosensors being constructed with useful properties and desired performance.
Collapse
Affiliation(s)
- Li-Ping Xu
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing, Beijing, 100083, PR China.
| | | | | |
Collapse
|
25
|
Interfacial electrochemical electron transfer in biology - towards the level of the single molecule. FEBS Lett 2011; 586:526-35. [PMID: 22024483 DOI: 10.1016/j.febslet.2011.10.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 10/04/2011] [Accepted: 10/11/2011] [Indexed: 11/21/2022]
Abstract
Physical electrochemistry has undergone a remarkable evolution over the last few decades, integrating advanced techniques and theory from solid state and surface physics. Single-crystal electrode surfaces have been a core notion, opening for scanning tunnelling microscopy directly in aqueous electrolyte (in situ STM). Interfacial electrochemistry of metalloproteins is presently going through a similar transition. Electrochemical surfaces with thiol-based promoter molecular monolayers (SAMs) as biomolecular electrochemical environments and the biomolecules themselves have been mapped with unprecedented resolution, opening a new area of single-molecule bioelectrochemistry. We consider first in situ STM of small redox molecules, followed by in situ STM of thiol-based SAMs as molecular views of bioelectrochemical environments. We then address electron transfer metalloproteins, and multi-centre metalloenzymes including applied single-biomolecular perspectives based on metalloprotein/metallic nanoparticle hybrids.
Collapse
|
26
|
Fang Y, Nguyen P, Ivasenko O, Aviles MP, Kebede E, Askari MS, Ottenwaelder X, Ziener U, Siri O, Cuccia LA. Charge-assisted hydrogen bond-directed self-assembly of an amphiphilic zwitterionic quinonemonoimine at the liquid-solid interface. Chem Commun (Camb) 2011; 47:11255-7. [PMID: 21927761 DOI: 10.1039/c1cc14085j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Charge-assisted hydrogen bond-directed self-assembly of a zwitterionic quinonemonoimine was investigated at the liquid/solid interface using scanning tunnelling microscopy. Factors governing morphology, chirality and multilayer formation are discussed, presenting an important foundation for understanding the properties of a large family of related molecules with interesting potential in supramolecular design.
Collapse
Affiliation(s)
- Yuan Fang
- Department of Chemistry & Biochemistry, Concordia University, 7141 Sherbrooke St. West, Montréal, QC, Canada H4B 1R6
| | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Xie HJ, Lei QF, Fang WJ. Intermolecular interactions between gold clusters and selected amino acids cysteine and glycine: a DFT study. J Mol Model 2011; 18:645-52. [DOI: 10.1007/s00894-011-1112-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 04/28/2011] [Indexed: 11/28/2022]
|
28
|
Zhang J, Welinder AC, Chi Q, Ulstrup J. Electrochemically controlled self-assembled monolayers characterized with molecular and sub-molecular resolution. Phys Chem Chem Phys 2011; 13:5526-45. [PMID: 21336358 DOI: 10.1039/c0cp02183k] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Self-assembled organization of functional molecules on solid surfaces has developed into a powerful and sophisticated tool for surface chemistry and nanotechnology. A number of reviews on the topic have been available since the mid 1990s. This perspective article aims to focus on recent development in the investigations of electronic structures and assembling dynamics of electrochemically controlled self-assembled monolayers (SAMs) of thiol containing molecules on gold surfaces. A brief introduction is first given and particularly illustrated by a Table summarizing the molecules studied, the surface lattice structures and the experimental operating conditions. This is followed by discussion of two major high-resolution experimental methods, scanning tunnelling microscopy (STM) and single-crystal electrochemistry. In Section 3, we briefly address choice of supporting electrolytes and substrate surfaces, and their effects on the SAM structures. Section 4 constitutes the major body of the article by offering some details of recent studies for the selected cases, including in situ monitoring of assembling dynamics, molecular electronic structures, and the key external factors determining the SAM packing. In Section 5, we give examples of what can be offered by theoretical computations for the detailed understanding of the SAM electronic structures revealed by STM images. A brief summary of the current applications of SAMs in wiring metalloproteins, design and fabrication of sensors, and single-molecule electronics is described in Section 6. In the final two sections (7 and 8), we discuss the current status in understanding of electronic structures and properties of SAMs in electrochemical environments and what could be expected for future perspectives.
Collapse
Affiliation(s)
- Jingdong Zhang
- Department of Chemistry and NanoDTU, Technical University of Denmark, Lyngby, Denmark.
| | | | | | | |
Collapse
|
29
|
El Garah M, Makoudi Y, Duverger E, Palmino F, Rochefort A, Chérioux F. Large-scale patterning of zwitterionic molecules on a Si(111)-7 × 7 surface. ACS NANO 2011; 5:424-428. [PMID: 21105746 DOI: 10.1021/nn102398g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The formation of a large scale pattern on Si(111)-7 × 7 reconstruction is still a challenge. We report herein a new solution to achieve this type of nanostructuration by using of zwitterionic molecules. The formation of a large-scale pattern is successfully obtained due to the perfect match between the molecular geometry and the surface topology and to electrostatic interactions between molecules and surface. The adsorption is described by high-resolution scanning tunneling microscopy (STM) images and supported by density functional theory and STM calculations.
Collapse
Affiliation(s)
- Mohamed El Garah
- Institut FEMTO-ST, Université de Franche-Comté, CNRS, ENSMM, 32, Avenue de l'Observatoire, F-25044 Besançon Cedex, France
| | | | | | | | | | | |
Collapse
|
30
|
Gudavarthy RV, Burla N, Kulp EA, Limmer SJ, Sinn E, Switzer JA. Epitaxial electrodeposition of chiral CuO films from copper(ii) complexes of malic acid on Cu(111) and Cu(110) single crystals. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03423a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
|
31
|
Zhang H, Li Y, Xu X, Sun T, Fuchs H, Chi L. Ion strength and pH sensitive phase transition of N-isobutyryl-L-(D)-cysteine monolayers on Au(111) surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7343-7348. [PMID: 20355723 DOI: 10.1021/la904237d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Self-assembled monolayers (SAMs) of N-isobutyryl-L-(D)-cysteine (NIBC) on Au(111) surfaces were successfully prepared by immersing the Au(111) surfaces in the preheated pure NIBC aqueous solutions for a certain time and characterized by means of scanning tunneling microscopy. Close-packed lamellar structures with a rectangular (4 x radical3) lattice were found both in the SAMs of L-NIBC and D-NIBC. The pH value of the aqueous solutions was found to be sensitive to adjust the SAM structures during the assembly. Changing the pH value from 5 to 7 may completely shift the SAM structures from close-packed lamellar phase to loose-packed perpendicular phase. Combined with density functional theory calculations, such kind of phase transition was explained by the breaking of hydrogen bonds between carboxylic groups and the formation of extra interactions between COO(-) and Au.
Collapse
Affiliation(s)
- Haiming Zhang
- Physicalisches Institut, Muenster University, D-48149 Muenster, Germany
| | | | | | | | | | | |
Collapse
|
32
|
Calzolari A, Cicero G, Cavazzoni C, Di Felice R, Catellani A, Corni S. Hydroxyl-Rich β-Sheet Adhesion to the Gold Surface in Water by First-Principle Simulations. J Am Chem Soc 2010; 132:4790-5. [DOI: 10.1021/ja909823n] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Arrigo Calzolari
- Centro S3, CNR-Istituto di Nanoscienze, Modena, Italy, Department of Material Science and Chemical Engineering, Politecnico of Torino, Torino, Italy, CNR-IMEM Institute of Materials for Electronics and Magnetisms, Parma, Italy, and CINECA, Interuniversity Computing Center, Bologna, Italy
| | - Giancarlo Cicero
- Centro S3, CNR-Istituto di Nanoscienze, Modena, Italy, Department of Material Science and Chemical Engineering, Politecnico of Torino, Torino, Italy, CNR-IMEM Institute of Materials for Electronics and Magnetisms, Parma, Italy, and CINECA, Interuniversity Computing Center, Bologna, Italy
| | - Carlo Cavazzoni
- Centro S3, CNR-Istituto di Nanoscienze, Modena, Italy, Department of Material Science and Chemical Engineering, Politecnico of Torino, Torino, Italy, CNR-IMEM Institute of Materials for Electronics and Magnetisms, Parma, Italy, and CINECA, Interuniversity Computing Center, Bologna, Italy
| | - Rosa Di Felice
- Centro S3, CNR-Istituto di Nanoscienze, Modena, Italy, Department of Material Science and Chemical Engineering, Politecnico of Torino, Torino, Italy, CNR-IMEM Institute of Materials for Electronics and Magnetisms, Parma, Italy, and CINECA, Interuniversity Computing Center, Bologna, Italy
| | - Alessandra Catellani
- Centro S3, CNR-Istituto di Nanoscienze, Modena, Italy, Department of Material Science and Chemical Engineering, Politecnico of Torino, Torino, Italy, CNR-IMEM Institute of Materials for Electronics and Magnetisms, Parma, Italy, and CINECA, Interuniversity Computing Center, Bologna, Italy
| | - Stefano Corni
- Centro S3, CNR-Istituto di Nanoscienze, Modena, Italy, Department of Material Science and Chemical Engineering, Politecnico of Torino, Torino, Italy, CNR-IMEM Institute of Materials for Electronics and Magnetisms, Parma, Italy, and CINECA, Interuniversity Computing Center, Bologna, Italy
| |
Collapse
|
33
|
Welinder AC, Zhang J, Steensgaard DB, Ulstrup J. Adsorption of human insulin on single-crystal gold surfaces investigated by in situ scanning tunnelling microscopy and electrochemistry. Phys Chem Chem Phys 2010; 12:9999-10011. [DOI: 10.1039/c0cp01021a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
34
|
Canepa M, Lavagnino L, Pasquali L, Moroni R, Bisio F, De Renzi V, Terreni S, Mattera L. Growth dynamics of L-cysteine SAMs on single-crystal gold surfaces: a metastable deexcitation spectroscopy study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:264005. [PMID: 21828453 DOI: 10.1088/0953-8984/21/26/264005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report on a metastable deexcitation spectroscopy investigation of the growth of L-cysteine layers deposited under UHV conditions on well-defined Au(110)- (1 × 2) and Au(111) surfaces. The interaction of He(*) with molecular orbitals gave rise to well-defined UPS-like Penning spectra which provided information on the SAM assembly dynamics and adsorption configurations. Penning spectra have been interpreted through comparison with molecular orbital DFT calculations of the free molecule and have been compared with XPS results of previous works. Regarding adsorption of first-layer molecules at room temperature (RT), two different growth regimes were observed. On Au(110), the absence of spectral features related to orbitals associated with SH groups indicated the formation of a compact SAM of thiolate molecules. On Au(111), the data demonstrated the simultaneous presence, since the early stages of growth, of strongly and weakly bound molecules, the latter showing intact SH groups. The different growth mode was tentatively assigned to the added rows of the reconstructed Au(110) surface which behave as extended defects effectively promoting the formation of the S-Au bond. The growth of the second molecular layer was instead observed to proceed similarly for both substrates. Second-layer molecules preferably adopt an adsorption configuration in which the SH group protrudes into the vacuum side.
Collapse
Affiliation(s)
- M Canepa
- CNISM and Department of Physics, University of Genova, via Dodecaneso 33, I-16145 Genova, Italy
| | | | | | | | | | | | | | | |
Collapse
|
35
|
Zhang J, Chi Q, Nazmutdinov RR, Zinkicheva TT, Bronshtein MD. Submolecular electronic mapping of single cysteine molecules by in situ scanning tunneling imaging. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2232-2240. [PMID: 19161269 DOI: 10.1021/la8034006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have used L-cysteine (Cys) as a model system to study the surface electronic structures of single molecules at the submolecular level in aqueous buffer solution by a combination of electrochemical scanning tunneling microscopy (in situ STM), electrochemistry including voltammetry and chronocoulometry, and density functional theory (DFT) computations. Cys molecules were assembled on single-crystal Au(110) surfaces to form a highly ordered monolayer with a periodic lattice structure of c(2x2) in which each unit contains two molecules; this conclusion is confirmed by the results of calculations based on a slab model for the metal surface. The ordered monolayer offers a platform for submolecular scale electronic mapping that is an issue of fundamental interest but remains a challenge in STM imaging science and surface chemistry. Single Cys molecules were mapped as three electronic subunits contributed mainly from three chemical moieties: thiol (-SH), carboxylic (-COOH), and amine (-NH2) groups. The contrasts of the three subunits depend on the environment (e.g., pH), which affects the electronic structure of adsorbed species. From the DFT computations focused on single molecules, rational analysis of the electronic structures is achieved to delineate the main factors that determine electronic contrasts in the STM images. These factors include the molecular orientation, the chemical nature of the elements or groups in the molecule, and the interaction of the elements with the substrate and tip. The computational images recast as constant-current-height profiles show that the most favorable molecular orientation is the adsorption of cysteine as a radical in zwitterionic form located on the bridge between the Au(110) atomic rows and with the amine and carboxyl group toward the solution bulk. The correlation between physical location and electronic contrast of the adsorbed molecules was also revealed by the computational data. The present study shows that cysteine packing in the adlayer on Au(110) from the liquid environment is in contrast to that from the ultrahigh-vacuum environment, suggesting solvent plays a role during molecular assembly.
Collapse
Affiliation(s)
- Jingdong Zhang
- Department of Chemistry, NanoDTU, Building 207, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | | | | | | | | |
Collapse
|
36
|
MacLaren DA, Johnston J, Duncan DA, Marchetto H, Dhesi SS, Gadegaard N, Kadodwala M. Asymmetric photoelectron transmission through chirally-sculpted, polycrystalline gold. Phys Chem Chem Phys 2009; 11:8413-6. [DOI: 10.1039/b911447e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
37
|
Duchesne L, Gentili D, Comes-Franchini M, Fernig DG. Robust ligand shells for biological applications of gold nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:13572-13580. [PMID: 18991409 DOI: 10.1021/la802876u] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
An important point regarding the development of stable biofunctional nanoparticles for biomedical applications is their potential for aspecific interactions with the molecules of the biological environment. Here we report a new self-assembled ligand monolayer system for gold nanoparticles called Mix-matrices, formed by a mixture of HS-PEG and alcohol peptides (peptidols) molecules. Stability of the Mix-capped nanoparticles prepared in various conditions was assessed using tests of increasing stringency. The results highlight the importance of identifying a concentration of ligands sufficiently high to obtain a compact matrix when preparing nanoparticles and that the stability of capped nanoparticles in biological environments cannot be predicted solely on their resistance to electrolyte-induced aggregation. The Mix-capped nanoparticles are resistant to aggregation induced by electrolytes and to aspecific interactions with proteins and ligand exchange. In addition, Mix-matrices allow the easy introduction of a single recognition function per nanoparticle, allowing the specific and stoichiometric labeling of proteins with gold nanoparticles. Therefore, the Mix-matrices provide a useful tool for the development of nanoparticle-based quantitative bioanalytical and imaging techniques, as well as for therapeutic purposes, such as the specific targeting of cancerous cells for photothermal destruction.
Collapse
Affiliation(s)
- Laurence Duchesne
- Liverpool Institute for Nanoscale Science, Engineering and Technology, School of Biological Sciences, Biosciences Building, Crown Street, University of Liverpool, Liverpool, L69 7ZB, UK.
| | | | | | | |
Collapse
|
38
|
Santos E, Avalle L, Pötting K, Vélez P, Jones H. Experimental and theoretical studies of l-cysteine adsorbed at Ag(111) electrodes. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2007.12.080] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
39
|
Zong W, Liu R, Zhao L, Tian Y, Yuan D, Gao C. Side-chain oxidative damage to cysteine on a glassy carbon electrode. Amino Acids 2008; 37:559-64. [PMID: 18726172 DOI: 10.1007/s00726-008-0173-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2008] [Accepted: 08/01/2008] [Indexed: 11/25/2022]
Abstract
In this paper, oxidative damage to the cysteine (CySH) side-chain on a glassy carbon electrode (GCE) was investigated. Voltammetric studies show that there are three anodic peaks for the oxidation of CySH, which arise from (1) the oxidation of the -SH side-chain, forming cystine (0.71 V, vs. SCE) and (2) CySO( x )H, x = 2, 3 (0.98 V vs. SCE), and (3) the oxidation of the amino acid carboxyl group (around 1.51 V vs. SCE). The influence of dissolved oxygen, pH, scan rate, scan time, temperature and CySH concentration were investigated and the oxidative mechanism proposed. The peaks near 0.71 and 0.98 V are the promising candidates for measuring the oxidation of CySH on the GCE. This paper provides a new strategy for researching oxidative damage of amino acids, sulfur-containing peptides and proteins.
Collapse
Affiliation(s)
- Wansong Zong
- School of Environmental Science and Engineering, Shandong University, 27# Shanda South Road, 250100, Jinan, People's Republic of China
| | | | | | | | | | | |
Collapse
|
40
|
Nishino T, Umezawa Y. Single-molecule chiral recognition on a surface by chiral molecular tips. Anal Chem 2008; 80:6968-73. [PMID: 18693750 DOI: 10.1021/ac800818f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chiral surfaces attract increasing interest due to their vital role in a variety of scientific fields, such as chiral separation and heterogeneous enantioselective catalysis. The most urgent issue in research on such two-dimensional chirality is a lack of methodologies that recognize molecular chirality on a surface. Here we show that the chiral molecular tips enable for the first time discrimination of enantiomers on a single-molecule basis. The chiral selectivity is attributed to favorable chemical interactions that the molecular tips form with only one of two enantiomers. The stereoselective observation reveals spatial distribution of the enantiomers on a surface at the molecular level. The chiral molecular tips open a way for control of organization of enantiomers toward the advanced functionality of these chiral surfaces through knowledge on pivotal roles of chirality on molecular assemblies as shown here.
Collapse
Affiliation(s)
- Tomoaki Nishino
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | | |
Collapse
|
41
|
Zhang J, Kuznetsov AM, Medvedev IG, Chi Q, Albrecht T, Jensen PS, Ulstrup J. Single-Molecule Electron Transfer in Electrochemical Environments. Chem Rev 2008; 108:2737-91. [PMID: 18620372 DOI: 10.1021/cr068073+] [Citation(s) in RCA: 252] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
42
|
Popoff A, Fichou D. Immobilization of paracetamol and benzocaine pro-drug derivatives as long-range self-organized monolayers on graphite. Colloids Surf B Biointerfaces 2008; 63:153-8. [DOI: 10.1016/j.colsurfb.2007.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Revised: 11/01/2007] [Accepted: 11/06/2007] [Indexed: 11/16/2022]
|
43
|
|
44
|
Bovet N, McMillan N, Gadegaard N, Kadodwala M. Supramolecular assembly facilitating adsorbate-induced chiral electronic states in a metal surface. J Phys Chem B 2007; 111:10005-11. [PMID: 17661515 DOI: 10.1021/jp074056s] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Through the application of optically active second-harmonic generation measurements (OA-SHG) we have demonstrated that the adsorption of amino acids cysteine (HSCH(2)CHNH(2)COOH) and penicillamine (HSC(CH3)(2)CHNH(2)COOH) from solution can induce chiral electronic states in an initially achiral polycrystalline Au film. The chiral induction is strongly dependent upon the pH of the deposition solution; adsorption of penicillamine and cysteine under acidic conditions (pH = 3) induces the same level of optical activity, whereas at pH = 11, the optical activity induced by cysteine is reduced by ca. 50% and penicillamine does not induce optical activity at all. The pH dependence indicates that the presence of interadsorbate hydrogen bonds, and consequently the supramolecular assembly of the adsorbates, facilitates the induction of chiral electronic states in the Au surface. This observation demonstrates that the symmetry properties of the extended structure of the self-assembled layer, and not the local adsorption geometry of the isolated adsorbed moiety, play the lead role in the induction of chiral metallic electronic states. The dependence of the chiral induction on COOH groups is identical to that observed in studies of optical activity in chiral thiol-protected nanoparticles, suggesting a common mechanism for the chiral perturbation in extended films and nanoparticles.
Collapse
Affiliation(s)
- Nicolas Bovet
- Department of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK
| | | | | | | |
Collapse
|