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Wu T, Fitchett CM, Downard AJ. Para-Fluoro-Thiol Reaction on Anchor Layers Grafted from an Aryldiazonium Salt: A Tool for Surface Functionalization with Thiols. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11397-11405. [PMID: 34520216 DOI: 10.1021/acs.langmuir.1c02012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A new coupling reaction, the para-fluoro-thiol (PFT) reaction, activated by base at room temperature, is reported for carbon surface functionalization. 4-Nitrothiophenol (4-NTP) and (3-nitrobenzyl)mercaptan (3-NBM) were coupled to pentafluorophenyl (F5-Ph) anchor layers grafted from the aryldiazonium ion formed in situ. The relative yields of the PFT reactions, estimated from the electrochemical responses of coupled nitrophenyl (NP) and nitrobenzyl (NB) groups, depended on the nucleophilicity of the thiolate and the strength of the base. The highest surface concentration (4.6 × 10-10 mol cm-2) was obtained using 3-NBM in the presence of [Bu4N]OH; this concentration corresponds to the maximum that is typically achieved for other high-yielding coupling reactions at aryldiazonium ion anchor layers. The PFT reaction is expected to be applicable to the numerous thiol derivatives commonly restricted to self-assembled monolayer (SAM) formation at gold and other noble metals, thereby opening a simple new approach for interface design on carbon substrates. The strategy may also have advantages for modification of gold surfaces: the layer prepared by coupling 3-NBM to F5-Ph films on gold was found to be more stable to storage under ambient conditions than self-assembled monolayers of 3-NBM.
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Affiliation(s)
- Ting Wu
- School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
| | - Christopher M Fitchett
- School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
| | - Alison J Downard
- School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
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Ortiz M, Debela AM, Méthivier C, Thorimbert S, Hasenknopf B, O'Sullivan CK. Stable Carboxylate-Terminated Gold Surfaces Produced by Spontaneous Grafting of an Alkyltin Compound. Chemistry 2018; 24:11177-11184. [PMID: 29782690 DOI: 10.1002/chem.201801854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Indexed: 11/08/2022]
Abstract
Self-assembled monolayers formed by chemisorption of thiolated molecules on gold surfaces are widely applied for biosensing. Moreover, and due to the low stability of thiol-gold chemistry, contributions to the functionalisation of gold substrates with linkers that provide a more stable platform for the immobilisation of electroactive or biological molecules are highly appreciated. Herein, it is demonstrated that a carboxylated organotin compound can be successfully grafted onto gold substrates to form a highly stable organic layer with reactivity for subsequent binding to an aminated molecule. A battery of techniques were used to characterise the surface chemistry. The grafted layer was used to anchor aminoferrocene and subjected to both thermostability tests and long-term stability studies over a period of one year, demonstrating thermostability up to 90 °C and storage stability for at least 12 months at 4 °C protected from light. The stable surface tethering of molecules on gold substrates can be exploited in a plethora of applications, including molecular techniques, such as solid-phase amplification and solid-phase melting curve analysis, that require elevated temperature stability, as well as biosensors, which require long-term storage stability.
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Affiliation(s)
- Mayreli Ortiz
- Departament d'Enginyeria Química, Universitat Rovira i Virgili, Avinguda Països Catalans 26, 43007, Tarragona, Spain
| | - Ahmed M Debela
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire IPCM, 4 place Jussieu, 75005, Paris, France
| | - Christophe Méthivier
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface LRS, 75005, Paris, France
| | - Serge Thorimbert
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire IPCM, 4 place Jussieu, 75005, Paris, France
| | - Bernold Hasenknopf
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire IPCM, 4 place Jussieu, 75005, Paris, France
| | - Ciara K O'Sullivan
- Departament d'Enginyeria Química, Universitat Rovira i Virgili, Avinguda Països Catalans 26, 43007, Tarragona, Spain.,ICREA, Passeig Lluis Companys 23, 08010, Barcelona, Spain
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Wang X, Xi M, Guo M, Sheng F, Xiao G, Wu S, Uchiyama S, Matsuura H. An electrochemically aminated glassy carbon electrode for simultaneous determination of hydroquinone and catechol. Analyst 2016; 141:1077-82. [DOI: 10.1039/c5an02098k] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A simple strategy based on the easy modification of GCE by pre-electrolyzing it in ammonium carbamate aqueous solution was employed for the simultaneous determination of HQ and CC.
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Affiliation(s)
- Xiuyun Wang
- School of Chemistry
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Min Xi
- School of Chemistry
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Mengmeng Guo
- School of Chemistry
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Fangmeng Sheng
- School of Chemistry
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Guang Xiao
- School of Chemistry
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Shuo Wu
- School of Chemistry
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Shunichi Uchiyama
- Department of Applied Chemistry
- Graduate School of Engineering
- Saitama Institute of Technology
- Fukaya
- Japan
| | - Hiroaki Matsuura
- Department of Applied Chemistry
- Graduate School of Engineering
- Saitama Institute of Technology
- Fukaya
- Japan
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