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Emmons ED, Guicheteau JA, Fountain AW, Tripathi A. Effect of substituents on surface equilibria of thiophenols and isoquinolines on gold substrates studied using surface-enhanced Raman spectroscopy. Phys Chem Chem Phys 2020; 22:15953-15965. [PMID: 32628226 DOI: 10.1039/d0cp01125h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of substituents on the surface adsorption equilibria of thiophenols and isoquinolines on gold substrates was studied using surface-enhanced Raman spectroscopy (SERS) in order to determine the effects of the localized dipole moments and charge donating/withdrawing properties on the binding affinity. Two common classes of molecules used in SERS studies were examined, which included substituted aromatic thiols and nitrogen heterocyclic aromatic molecules (azaarenes), due to their strong affinity for gold surfaces. Unsubstituted thiophenol in aqueous solution binds strongly to gold surfaces. Therefore, it is difficult to measure an equilibrium constant, since even at concentrations of 10-8 M nearly a complete self-assembled monolayer (SAM) forms. In contrast, substituted thiophenols with electron-withdrawing groups, such as halogenated thiophenols, bind much less strongly, allowing equilibrium constants to be obtained. It is believed that the substituent withdrawing charge away from the sulfur atom affects the adsorption/binding between the analyte and surface. Thiophenols substituted with electron donating groups behaved similar to unsubstituted thiophenol, where a SAM was observed at concentrations as low as 10-8 M. These functional groups did not hinder the ability of the sulfur groups to bind with gold. In addition, a series of bromine-substituted isoquinolines, a group of azaarene compounds, were measured to determine the effects that the bromine substituent has when it is bound to the two different rings and if position on the rings has an effect. The azaarene class of molecules, including isoquinoline, adsorbs less strongly than thiophenols, and a dual Langmuir isotherm phenomenon is observed where protonated and neutral bromoisoquinoline molecules occupy two different types of sites on Klarite substrates, which consist of inverted micro-pyramids on Si wafers with rough/nanostructured Au coatings. Protonated isoquinolines bind to nucleophilic sites on the substrates which tend to occur on flatter regions of the substrate. By contrast, neutral isoquinolines bind to electrophilic sites which are predominant near microscopic edges on the substrate. The presence of the bromine substituent and its position in the fused ring structure changes the Gibbs free energies of adsorption, depending on which ring the substituent is in. These results can help to guide the development of SERS for analytical applications by demonstrating how changes in functional groups can affect the equilibrium constants, which are critical for determining the effectiveness of SERS as a tool for trace detection of analytes.
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Affiliation(s)
- Erik D Emmons
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Jason A Guicheteau
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Augustus W Fountain
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Ashish Tripathi
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
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Li YS. Vibrational spectroscopic studies of triethoxy(4-(trifluoromethyl)-phenyl) silane and its sol-gel coating. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 96:868-873. [PMID: 22925916 DOI: 10.1016/j.saa.2012.07.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 06/08/2012] [Accepted: 07/05/2012] [Indexed: 06/01/2023]
Abstract
We have prepared a silica sol-gel using triethoxy (4-(trifluoromethyl)-phenyl) silane (TETFMPS) as a precursor in ethanol solution under acidic condition. The prepared sol-gel was applied to the surface treatment of aluminum for corrosion prevention. Infrared and Raman spectra of the silane coupling agent, sol-gel and sol-gel films on metal have been collected. Infrared spectroscopy has been used to study the thermal effect on the chemical composition of xerogel. Results suggested that TETFMPS molecule has a C(s) point group symmetry with the plane of reflection orthogonal to the phenyl ring and the organic part of the sol-gel film remains essentially unchanged at or below 450 °C but decomposes at or above 550 °C. After the decomposition of the organic branch, the remaining film is composed of silica. Vibrational assignments were suggested by using the collected spectroscopic data in different states along with the group vibrational frequencies and other related references.
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Affiliation(s)
- Ying-Sing Li
- Department of Chemistry, University of Memphis, Memphis, TN 38152-6060, USA.
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Leusink AJ, Noltes JG, Budding HA, van der Kerk GJM. Studies in IVth group organometallic chemistry. XVI: Synthesis of organogermanium compounds containing the p-phenylene group. Some infrared characteristics of p-phenylene derivatives of silicon, germanium, tin and lead. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19640830811] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kübler R, Lüttke W. Infrarotspektroskopische Untersuchungen an isotopen Stickstoffverbindungen III. Mitteilung: Isomerie und Struktur der aromatischen Diazotate. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19630670103] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mishra AK, Tandon P. DFT Study and Heat Capacity of Polyaniline Pernigraniline Base. J Phys Chem B 2009; 113:9702-7. [DOI: 10.1021/jp901143m] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Abhishek Kumar Mishra
- Department of Physics, Amity School of Engineering and Technology, Amity University, Noida 201 301, India, and Department of Physics, University of Lucknow, Lucknow 226 007, India
| | - Poonam Tandon
- Department of Physics, Amity School of Engineering and Technology, Amity University, Noida 201 301, India, and Department of Physics, University of Lucknow, Lucknow 226 007, India
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Mishra AK, Tandon P, Gupta VD. Vibrational Dynamics of Polyaniline Pernigraniline Base Form: A Conducting Polymer. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/masy.200850512] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Damman P, Dosière M, Wittmann JC. Epitaxial Polymerization of Poly(p-oxybenzoate) on Friction-Transfer Poly(tetrafluoroethylene) Substrates. Macromolecules 1997. [DOI: 10.1021/ma9710343] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- P. Damman
- Laboratoire de Physico-Chimie des Polymères, Université de Mons-Hainaut, Place du Parc, 20, B-7000 Mons, Belgium and Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg, France
| | - M. Dosière
- Laboratoire de Physico-Chimie des Polymères, Université de Mons-Hainaut, Place du Parc, 20, B-7000 Mons, Belgium and Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg, France
| | - J. C. Wittmann
- Laboratoire de Physico-Chimie des Polymères, Université de Mons-Hainaut, Place du Parc, 20, B-7000 Mons, Belgium and Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg, France
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Damman P, Dosière M, Brunel M, Wittmann JC. Nucleation and Oriented Growth of Aromatic Crystals on Friction-Transferred Poly(tetrafluoroethylene) Layers. J Am Chem Soc 1997. [DOI: 10.1021/ja961173k] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- P. Damman
- Laboratoire de Physico-Chimie des Polymères, Université de Mons-Hainaut, Place du Parc, 20, B-7000 Mons, Belgium, Laboratoire de Cristallographie du CNRS, Avenue des Martyrs, 25, F-38000 Grenoble, France, and Institut Charles Sadron, rue de Boussingault, 6, F-67083 Strasbourg, France
| | - M. Dosière
- Laboratoire de Physico-Chimie des Polymères, Université de Mons-Hainaut, Place du Parc, 20, B-7000 Mons, Belgium, Laboratoire de Cristallographie du CNRS, Avenue des Martyrs, 25, F-38000 Grenoble, France, and Institut Charles Sadron, rue de Boussingault, 6, F-67083 Strasbourg, France
| | - M. Brunel
- Laboratoire de Physico-Chimie des Polymères, Université de Mons-Hainaut, Place du Parc, 20, B-7000 Mons, Belgium, Laboratoire de Cristallographie du CNRS, Avenue des Martyrs, 25, F-38000 Grenoble, France, and Institut Charles Sadron, rue de Boussingault, 6, F-67083 Strasbourg, France
| | - J. C. Wittmann
- Laboratoire de Physico-Chimie des Polymères, Université de Mons-Hainaut, Place du Parc, 20, B-7000 Mons, Belgium, Laboratoire de Cristallographie du CNRS, Avenue des Martyrs, 25, F-38000 Grenoble, France, and Institut Charles Sadron, rue de Boussingault, 6, F-67083 Strasbourg, France
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Moerlein S. Synthesis and spectroscopic characteristics of aryltrimethyl-silicon, -germanium, and -tin compounds. J Organomet Chem 1987. [DOI: 10.1016/0022-328x(87)80344-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Cossart-Magos C, Cossart D, Leach S. Jahn—Teller effects in substituted benzene cations. III. Gas phase emission spectrum of sym-C6Cl3H+3. Chem Phys 1979. [DOI: 10.1016/0301-0104(79)80040-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Bishop M, Schaefferr C, Zuckerman J. Far i.r. and Raman assignments of substituted aryltrimethyltins. ACTA ACUST UNITED AC 1976. [DOI: 10.1016/0584-8539(76)80273-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Witke K, Reich P, Kriesmann H. Spektroskopische Untersuchungen an Siliciumverbindungen. XXXI. Schwingungsverhalten von p-substituierten N,N-Bistrimethylsilylanilinen. Z Anorg Allg Chem 1971. [DOI: 10.1002/zaac.19713800207] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Campagnaro G, Wood J. The vibrational spectra and origin of torsional barriers in some aromatic systems. J Mol Struct 1970. [DOI: 10.1016/0022-2860(70)87004-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vibrational spectra of benzene derivatives—VII. 4-Fluoro- and 4-bromo-benzenethiol, 4-chloro- and 4-bromophenylmethylsulphide. ACTA ACUST UNITED AC 1970. [DOI: 10.1016/0584-8539(70)80212-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Cvitaš T, Hollas J. Rotational band contour analysis in the 2760 Å system of p-chlorofluorobenzene. Mol Phys 1970. [DOI: 10.1080/00268977000100271] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Vibrational spectra of organometallic compounds—I. Alkyl and aryl compounds of mercury(II). ACTA ACUST UNITED AC 1968. [DOI: 10.1016/0584-8539(68)80185-0] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Singh V, Singh R, Singh I. Vibrational spectra of ortho-, meta- and para-chloroanilines. ACTA ACUST UNITED AC 1966. [DOI: 10.1016/0371-1951(66)80121-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zur Struktur von Organoschwefelverbindungen, 10. Mitteilung: IR- und Raman Spektren von Methylarylsulfiden, -sulfoxiden und -sulfonen. ACTA ACUST UNITED AC 1965. [DOI: 10.1016/0371-1951(65)80075-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Étude comparée des spectres de vibration des dérivés p-disubstitués du benzène—II région 3000–3200 cm−1. ACTA ACUST UNITED AC 1959. [DOI: 10.1016/s0371-1951(59)80311-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Garrigou-Lagrange C, Lebas JM, Josien ML. Etude comparée des spectres de vibration des dérivés paradisubstitués du benzène—i. ACTA ACUST UNITED AC 1958. [DOI: 10.1016/0371-1951(58)80057-0] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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