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Formation of long-range-ordered self-assembled monolayers of dodecyl thiocyanates on Au(111) via ambient-pressure vapor deposition. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123969] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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An Efficient Selectfluor-Mediated Oxidative Thio- and Selenocyanation of Diversely Substituted Indoles and Carbazoles. HETEROATOM CHEMISTRY 2019. [DOI: 10.1155/2019/1459681] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A facile Selectfluor-mediated oxidative method for direct introduction of SCN and SeCN groups into diversely substituted indoles and carbazoles is described, by employing readily available thiocyanate and selenocyanate salts, and the scope of the method is underscored by providing 24 examples. The feasibility to sequentially introduce SCN followed by SeCN on a carbazole framework and to synthesize the corresponding S-tetrazole and Se-tetrazole derivatives is also demonstrated.
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3
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Maity P, Paroi B, Ranu BC. Transition-Metal-Free Iodine Catalyzed Selenocayanation of Styrenyl Bromides and an Easy Access to Benzoselenophenes via Intermediacy of Styrenyl Selenocyanate. Org Lett 2017; 19:5748-5751. [DOI: 10.1021/acs.orglett.7b02571] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pintu Maity
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Bidisha Paroi
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Brindaban C. Ranu
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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4
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Muniraj N, Dhineshkumar J, Prabhu KR. N-Iodosuccinimide Catalyzed Oxidative Selenocyanation and Thiocyanation of Electron Rich Arenes. ChemistrySelect 2016. [DOI: 10.1002/slct.201600292] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Nachimuthu Muniraj
- Department of Organic Chemistry; Indian Institute of Science; Bangalore 560 012 Karnataka India
| | - Jayaraman Dhineshkumar
- Department of Organic Chemistry; Indian Institute of Science; Bangalore 560 012 Karnataka India
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5
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Yin X, Peretz Y, Oppenheimer PG, Zeiri L, Masarwa A, Froumin N, Jelinek R. Conductive and SERS-active colloidal gold films spontaneously formed at a liquid/liquid interface. RSC Adv 2016. [DOI: 10.1039/c6ra03403a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Colloidal Au film forms at a water/pentane interface through spontaneous crystallization/reduction of water-soluble gold complex.
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Affiliation(s)
- Xiuxiu Yin
- Department of Chemistry
- Ben Gurion University of the Negev
- Beer Sheva 84105
- Israel
| | - Yossef Peretz
- Department of Chemistry
- Ben Gurion University of the Negev
- Beer Sheva 84105
- Israel
| | | | - Leila Zeiri
- Ilse Katz Institute for Nanotechnology
- Ben Gurion University of the Negev
- Beer Sheva 84105
| | - Alexandra Masarwa
- Department of Chemistry
- Ben Gurion University of the Negev
- Beer Sheva 84105
- Israel
| | - Natalya Froumin
- Ilse Katz Institute for Nanotechnology
- Ben Gurion University of the Negev
- Beer Sheva 84105
| | - Raz Jelinek
- Department of Chemistry
- Ben Gurion University of the Negev
- Beer Sheva 84105
- Israel
- Ilse Katz Institute for Nanotechnology
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6
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Rousseau G, Lavenn C, Cardenas L, Loridant S, Wang Y, Hahn U, Nierengarten JF, Demessence A. One-pot synthesis of sub-3 nm gold nanoparticle networks connected by thio-based multidentate fullerene adducts. Chem Commun (Camb) 2015; 51:6730-3. [PMID: 25670346 DOI: 10.1039/c5cc00204d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new organo-soluble [60]fullerene hexaadduct bearing twelve thiocyanate functions has been synthesized and successfully used as a stabilizing/assembling agent to assemble homogeneous sub-3 nm gold nanoparticles into extended tridimensional networks.
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Affiliation(s)
- Guillaume Rousseau
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), UMR CNRS 5256, Lyon 1 University, 2 avenue A. Einstein, 69628 Villeurbanne, France.
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7
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Niebel C, Calard F, Jarrosson T, Lère-Porte JP, Breton T, Serein-Spirau F. Spontaneous assembly of silylethane-thiol derivatives on Au(111): a chemically robust thiol protecting group as the precursor for the direct formation of aromatic gold thiolate monolayers. Chem Commun (Camb) 2015; 51:7622-5. [PMID: 25848655 DOI: 10.1039/c5cc00600g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembled monolayers (SAMs) on gold were obtained by the direct absorption of a fully conjugated phenylenethienylene derivative () presenting robust silylethane-thiol protecting groups as anchoring agents. The thiol deprotection and SAM formation have been evidenced by quartz crystal microbalance (QCM) measurements and X-ray photoelectron spectroscopy (XPS), and have been compared to the SAM obtained from its thioacetate analog (5). The chemically robust silylethane-thiol protecting group appeared as a surprisingly effective anchoring agent for the preparation of aromatic SAMs on Au(111), suitable for subsequent post-functionalization.
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Affiliation(s)
- Claude Niebel
- Equipe Architectures Moléculaires et Matériaux Nanostructurés, UMR CNRS 5253, Institut Charles Gerhardt, Ecole Nationale Supérieure de Chimie de Montpellier, 8 rue de l'Ecole Normale, 34293 Montpellier Cedex, France.
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Rietzler F, Piermaier M, Deyko A, Steinrück HP, Maier F. Electrospray ionization deposition of ultrathin ionic liquid films: [C8C1Im]Cl and [C8C1Im][Tf2N] on Au(111). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1063-1071. [PMID: 24405292 DOI: 10.1021/la404429q] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We introduce a new method for preparing ultrathin ionic liquid (IL) films on surfaces by means of electrospray ionization deposition (ESID) under ultraclean and well-defined ultra-high-vacuum (UHV) conditions. In contrast to physical vapor deposition (PVD) of ILs under UHV, ESID even allows deposition of ILs, which are prone to thermal decomposition. As proof of concept, we first investigated ultrathin [C8C1Im][Tf2N] (=1-methyl-3-octyl imidazolium bis(trifluoromethyl)imide) films on Au(111) by angle-resolved X-ray photoelectron spectroscopy (ARXPS). Films obtained by ESID are found to be virtually identical to films grown by standard PVD. Thereafter, ESID of [C8C1Im]Cl on Au(111) was studied as a first example of an IL that cannot be prepared as ultrathin film otherwise. [C8C1Im]Cl forms a wetting layer with a checkerboard arrangement with the cationic imidazolium ring and the chloride anion adsorbed next to each other on the substrate and the alkyl chain pointing toward vacuum. This arrangement within the wetting layer is similar to that observed for [C8C1Im][Tf2N], albeit with a higher degree of order of the alkyl chains. Further deposition of [C8C1Im]Cl leads to a pronounced island growth on top of the wetting layer, which is independently confirmed by ARXPS and atomic force microscopy. This behavior contrasts the growth behavior found for [C8C1Im][Tf2N], where layer-by-layer growth on top of the wetting layer is observed. The dramatic difference between both ILs is attributed to differences in the cation-anion interactions and in the degree of order in the wetting layer of the two ILs.
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Affiliation(s)
- Florian Rietzler
- Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstrasse 3, 91058 Erlangen, Germany
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9
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Metal complex oligomer and polymer wires on electrodes: Tactical constructions and versatile functionalities. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.04.019] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Lee SY, Choi Y, Ito E, Hara M, Lee H, Noh J. Growth, solvent effects, and thermal desorption behavior of octylthiocyanate self-assembled monolayers on Au(111). Phys Chem Chem Phys 2013; 15:3609-17. [DOI: 10.1039/c3cp44425b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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11
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Koczkur KM, Hamed EM, Hesp CR, Houmam A. The intriguing reaction of aromatic sulfonyl phthalimides with gold surfaces. Phys Chem Chem Phys 2013; 15:348-57. [DOI: 10.1039/c2cp42943h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Kallum M Koczkur
- University of Guelph, Department of Chemistry, Electrochemical Technology Centre, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
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Houmam A, Muhammad H, Koczkur KM. Rapid formation of a dense sulfur layer on gold through use of triphenylmethane sulfenyl chloride as a precursor. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:16881-16889. [PMID: 23131048 DOI: 10.1021/la3032607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The use of triphenylmethane sulfenyl chloride as a new precursor leads to the efficient deposition of sulfur on polycrystalline gold and Au(111) substrates. The modified surfaces are characterized using X-ray photoelectron spectroscopy (XPS), electrochemistry and scanning tunneling microscopy (STM). The XPS data shows the rapid deposition of polymeric sulfur within very short times. Electrochemical stripping cyclic voltammetry (CV) confirms the rapid deposition and shows that high coverage values are achieved. STM imaging shows the formation of a wide range sulfur layer and production of the well-known etch pits. High-resolution STM images confirm the high density of the sulfur layers and show formation of a long-range phase consisting of rhombus structures close to the previously described rectangular structures along with other parallelograms and partial parallelograms. The present results do not show the initial formation of any organic self-assembled monolayer (SAM) indicating that the formation of polymeric sulfur does not result from the decomposition of an initial SAM as previously observed with alkyl and aryl thiolate-based SAMs. The suggested mechanism involves an initial reductive process similar to the one reported for thiocyanates and sulfenyl chlorides. This is followed by the dissociation of the Ph(3)C-S bond, leaving only sulfur on the surface, through a process leading to the recombination of the remaining fragments to yield triphenylmethyl chloride.
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Affiliation(s)
- Abdelaziz Houmam
- Electrochemical Technology Centre, Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
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Muhammad H, Koczkur KM, Kycia AH, Houmam A. Nitro-substituted arene sulfenyl chlorides as precursors to the formation of aromatic SAMs. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:15853-15863. [PMID: 23078107 DOI: 10.1021/la303395e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The formation of aromatic SAMs on Au(111) using three nitro-substituted arene sulfenyl chlorides (4-nitrophenyl sulfenyl chloride (1), 2-nitrophenyl sulfenyl chloride (2), and 2,4-dinitrophenyl sulfenyl chloride (3)) is studied. The formation of SAMs and their quality are investigated as a function of the position of the nitro substituent(s) on the aromatic ring. The modified surfaces are characterized by X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), polarization modulation infrared reflection absorption spectroscopy (PMIRRAS), and cyclic voltammetry (CV). The results show that all three compounds are deposited on Au within very short times. The corresponding coverages are determined using CV. However, only compound 1 forms stable, long-range, well-ordered SAMs. The 4-nitrophenyl thiolate is adsorbed nearly vertically on the Au surface. Compounds 2 and 3 both form lower-quality SAMs where the adsorbed nitro-phenyl thiolates are more tilted. These SAMs are less stable than the ones obtained with the 4-nitrosubsituted precursor and decompose with time, leaving only sulfur on the gold surface.
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Affiliation(s)
- Hamida Muhammad
- Electrochemical Technology Centre, Department of Chemistry, University of Guelph, Guelph, Ontario, Canada
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Houmam A, Muhammad H, Koczkur KM. Physical structure of standing-up aromatic SAMs revealed by scanning tunneling microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:13544-13553. [PMID: 21970561 DOI: 10.1021/la202928z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Long-range-ordered aromatic SAMs are formed on Au(111) using 4-nitrophenyl sulfenyl chloride as a precursor. Although the main structure is a √3 × √3 with a molecular density similar to that usually found for aliphatic SAMs, particular spots presenting specific shapes are also observed by STM. These include hexagons, partial hexagons, parallelograms, and zigzags resulting from specific arrangements of adsorbed molecules. These molecular arrangements are reversible as they form and dissociate or "vanish" in various areas on the surface. STM shows that these particular structures provide some order to their surrounding because areas void of these structures look less ordered. More interestingly, STM shows submolecular details of the molecules involved in forming these structures, hence providing direct experimental evidence for the ability of the STM to provide physical structure information of standing up SAMs. This is indeed a heavily debated question, and this work reports the first experimental example where submolecular physical structure is revealed by STM for standing-up SAMs.
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Affiliation(s)
- Abdelaziz Houmam
- Electrochemical Technology Centre, Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
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Koczkur KM, Hamed EM, Houmam A. Sulfur multilayer formation on Au(111): new insights from the study of hexamethyldisilathiane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:12270-12274. [PMID: 21916512 DOI: 10.1021/la202591j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Hexamethyldisilathiane was successfully used as a new precursor for the formation of S layers on Au and to study their interaction. Characterization of the S modified gold surface was done by X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), and scanning tunneling microscopy (STM). Key findings include the direct observation by STM of (i) coexistence of different phases, (ii) multiple sulfur layers formation, (ii) formation of rectangular structures not only on the adlayer but also on the top layer, and (iv) rectangular structure mobility on different layers. These results provide clear evidence regarding the adsorbate nature of the rectangular structures, solving a highly debated question.
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Affiliation(s)
- Kallum M Koczkur
- Department of Chemistry, Electrochemical Technology Centre, University of Guelph, Guelph, Ontario N1G 2W1, Canada
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Houmam A, Muhammad H, Chahma M, Koczkur K, Thomas DF. 4-Nitrophenyl sulfenyl chloride as a new precursor for the formation of aromatic SAMs on gold surfaces. Chem Commun (Camb) 2011; 47:7095-7. [DOI: 10.1039/c1cc11451d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Choi YS, Kang HG, Choi IC, Lee NS, Cho JH, Jang CH, Noh JE. Coexistence of Closely Packed c(4 × 2) and Striped Phases in Self-Assembled Monolayers of Decylthiocyanates on Au(111). B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.04.901] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Haryono M, Heinemann FW, Petukhov K, Gieb K, Müller P, Grohmann A. Parallel Crystallization of a “Static” and a Spin-Crossover Polymorph of an Iron(II) Complex from the Same Solution. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900130] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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