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Begum F, Ikram M, Twamley B, Baker RJ. Perfluorinated phosphine and hybrid P-O ligands for Pd catalysed C-C bond forming reactions in solution and on Teflon supports. RSC Adv 2019; 9:28936-28945. [PMID: 35528399 PMCID: PMC9071828 DOI: 10.1039/c9ra04863d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 09/08/2019] [Indexed: 11/21/2022] Open
Abstract
The synthesis of two types of phosphine ligands that feature perfluorinated ponytails is reported. A bidentate (RfCH2CH2)2PCH2CH2P(CH2CH2Rf)2 (Rf = CF3(CF2) n ; n = 5, 7) and an alkoxyphosphine made by ring opening a fluorous epoxide, RfCH2CH(OH)CH2PR2 (Rf = CF3(CF2)7), have been prepared and spectroscopically characterised. The electronic effects of the fluorous chains have been elucidated from either the 1 J Pt-P or 1 J P-Se coupling constants in Pt(ii) or phosphine selenide compounds. Whilst the bidentate phosphines do not give stable or active Pd catalysts, the hybrid ligand does allow Susuki, Heck and Sonogashira catalysis to be demonstrated with low catalyst loadings and good turnovers. Whilst a fluorous extraction methodology does not give good performance, the ligand can be adsorbed onto Teflon tape and for the Suzuki cross coupling reaction the catalytic system can be run 6 times before activity drops and this has been traced to oxidation of the ligand. Additionally the crystal structure of the hybrid phosphine oxide is reported and the non-covalent interactions discussed.
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Affiliation(s)
- Farzana Begum
- School of Chemistry, University of Dublin Trinity College Dublin 2 Ireland
- Department of Chemistry, Mirpur University of Science and Technology Mirpur AJK Pakistan
| | - Muhammad Ikram
- School of Chemistry, University of Dublin Trinity College Dublin 2 Ireland
- Department of Chemistry, Abdul Wali Khan University Mardan Pakistan
| | - Brendan Twamley
- School of Chemistry, University of Dublin Trinity College Dublin 2 Ireland
| | - Robert J Baker
- School of Chemistry, University of Dublin Trinity College Dublin 2 Ireland
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Tran RJ, Sly KL, Conboy JC. Applications of Surface Second Harmonic Generation in Biological Sensing. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2017; 10:387-414. [PMID: 28301745 DOI: 10.1146/annurev-anchem-071015-041453] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Surface second harmonic generation (SHG) is a coherent, nonlinear optical technique that is well suited for investigations of biomolecular interactions at interfaces. SHG is surface specific due to the intrinsic symmetry constraints on the nonlinear process, providing a distinct analytical advantage over linear spectroscopic methods, such as fluorescence and UV-Visible absorbance spectroscopies. SHG has the ability to detect low concentrations of analytes, such as proteins, peptides, and small molecules, due to its high sensitivity, and the second harmonic response can be enhanced through the use of target molecules that are resonant with the incident (ω) and/or second harmonic (2ω) frequencies. This review describes the theoretical background of SHG, and then it discusses its sensitivity, limit of detection, and the implementation of the method. It also encompasses the applications of surface SHG directed at the study of protein-surface, small-molecule-surface, and nanoparticle-membrane interactions, as well as molecular chirality, imaging, and immunoassays. The versatility, high sensitivity, and surface specificity of SHG show great potential for developments in biosensors and bioassays.
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Affiliation(s)
- Renee J Tran
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112;
| | - Krystal L Sly
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112;
| | - John C Conboy
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112;
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Lipovská P, Rathouská L, Šimůnek O, Hošek J, Kolaříková V, Rybáčková M, Cvačka J, Svoboda M, Kvíčala J. Synthesis and catalytic activity of ruthenium complexes modified with chiral racemic per- and polyfluorooxaalkanoates. J Fluor Chem 2016. [DOI: 10.1016/j.jfluchem.2016.09.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Jin X, Zhou P, Zheng C, Li H. A new coordination mode of (E)-3-(3-hydroxyl-phenyl)-acrylic acid in copper complex: Crystal structure and magnetic properties. J SOLID STATE CHEM 2015. [DOI: 10.1016/j.jssc.2014.11.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Cadmium (II) dicarboxylate complexes of 2,2′-[2-fluoro-phenylmethylidenebis(3,5-methyl-2-phenyleneoxy)]diacetic acid formed in different solvents. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.04.057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Babuněk M, Šimůnek O, Hošek J, Rybáčková M, Cvačka J, Březinová A, Kvíčala J. Heavy fluorous phosphine-free ruthenium catalysts for alkene metathesis. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Sly KL, Nguyen TT, Conboy JC. Lens-less surface second harmonic imaging. OPTICS EXPRESS 2012; 20:21953-21967. [PMID: 23037346 PMCID: PMC3601730 DOI: 10.1364/oe.20.021953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 09/06/2012] [Accepted: 09/07/2012] [Indexed: 06/01/2023]
Abstract
Lens-less surface second harmonic generation imaging (SSHGI) is used to image an SHG active molecule, (S)-(+)-1,1'-bi-2-naphthol (SBN), incorporated into a lipid bilayer patterned with the 1951 United States Air Force resolution test target. Data show the coherent plane-wave nature of SHG allows direct imaging without the aid of a lens system. Lens-less SSHGI readily resolves line-widths as small as 223 μm at an object-image distance of 7.6 cm and line-widths of 397 μm at distances as far as 30 cm. Lens-less SSHGI simplifies the detection method, raises photon collection efficiency, and expands the field-of-view. These advantages allow greater throughput and make lens-less SSHGI a potentially valuable detection method for biosensors and medical diagnostics.
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Affiliation(s)
- Krystal L. Sly
- Department of Chemistry, University of Utah, 315 South 1400 East, Rm. 2020, Salt Lake City, Ut. 84112,
USA
| | - Trang T. Nguyen
- School of Biotechnology, International University, Vietnam National University-HCMC, Quarter 6, Linh Trung Ward, Thu Duc Distict, HCMC,
Vietnam
| | - John C. Conboy
- Department of Chemistry, University of Utah, 315 South 1400 East, Rm. 2020, Salt Lake City, Ut. 84112,
USA
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Krafft MP. Large organized surface domains self-assembled from nonpolar amphiphiles. Acc Chem Res 2012; 45:514-24. [PMID: 22185721 DOI: 10.1021/ar200178a] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
For years, researchers had presumed that Langmuir monolayers of small C(n)F(2n+1)C(m)H(2m+1) (FnHm) diblock molecules (such as F8H16) consisted of continuous, featureless films. Recently we have discovered that they instead form ordered arrays of unusually large (~30-60 nm), discrete self-assembled surface domains or hemimicelles both at the surface of water and on solid substrates. These surface micelles differ in several essential ways from all previously reported or predicted molecular surface aggregates. They self-assemble spontaneously, even at zero surface pressure, depending solely on a critical surface concentration. They are very large (~100 times the length of the diblock) and involve thousands of molecules (orders of magnitude more than classical micelles). At the same time, the surface micelles are highly monodisperse and self-organize in close-packed hexagonal patterns (two-dimensional crystals). Their size is essentially independent from pressure, and they do not coalesce and are unexpectedly sturdy for soft matter (persisting even beyond surface film collapse). We and other researchers have observed large surface micelles for numerous diblocks, using Langmuir-Blodgett (LB) transfer, spin-coating and dip-coating techniques, or expulsion from mixed monolayers, and on diverse supports, establishing that hemimicelle formation and ordering are intrinsic properties of (perfluoroalkyl)alkanes. Notably, they involve "incomplete" surfactants with limited amphiphilic character, which further illustrates the outstanding capacity for perfluoroalkyl chains to promote self-assembly and interfacial film structuring. Using X-ray reflectivity, we determined a perfluoroalkyl-chain-up orientation. Theoretical investigations assigned self-assembly and hemimicelle stability to electrostatic dipole-dipole interactions at the interface between Fn- and Hm-sublayers. Grazing-incidence small-angle X-ray scattering (GISAXS) data collected directly on the surface of water unambiguously demonstrated the presence of surface micelles in monolayers of diblocks prior to LB transfer for atomic force microscopy imaging. We characterized an almost perfect two-dimensional crystal, with 12 assignable diffraction peaks, which established that self-assembly and regular nanopatterning were not caused by transfer or induced by the solid support. These experiments also provide the first direct identification of surface micelles on water, and the first identification of such large-size domains using GISAXS. Revisiting Langmuir film compression behavior after we realized that it actually was a compression of nanometric objects led to further unanticipated observations. These films could be compressed far beyond the documented film "collapse", eventually leading to the buildup of two superimposed, less-organized bilayers of diblocks on top of the initially formed monolayer of hemimicelles. Remarkably, the latter withstood the final, irreversible collapse of the composite films. "Gemini" tetrablocks, di(FnHm), with two Fn-chains and two Hm-chains, provided two superposed layers of discrete micelles, apparently the first example of thin films made of stacked discrete self-assembled nanoobjects. Decoration of solid surfaces with domains of predetermined size of these small "nonpolar" molecules is straightforward. Initial examples of applications include deposition of metal dots and catalytic oxidation of CO, and nanopatterning of SiO(2) films.
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Affiliation(s)
- Marie Pierre Krafft
- Systèmes Organisés Fluorés à Finalités Thérapeutiques (SOFFT), Institut Charles Sadron (CNRS UPR 22), Université de Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex 2, France
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Motreff A, Correa da Costa R, Allouchi H, Duttine M, Mathonière C, Duboc C, Vincent JM. A fluorous copper(II)–carboxylate complex which magnetically and reversibly responds to humidity in the solid state. J Fluor Chem 2012. [DOI: 10.1016/j.jfluchem.2011.03.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vincent JM. Recent advances of fluorous chemistry in material sciences. Chem Commun (Camb) 2012; 48:11382-91. [DOI: 10.1039/c2cc34750d] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Motiei L, Sassi M, Kaminker R, Evmenenko G, Dutta P, Iron MA, van der Boom ME. Synergism in multicomponent self-propagating molecular assemblies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1319-1325. [PMID: 21128588 DOI: 10.1021/la103936t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Multicomponent self-propagating molecular assemblies (SPMAs) have been generated from an organic chromophore, a redox-active polypyridyl complex, and PdCl(2). The structure of the multicomponent SPMA is not a linear combination of two assemblies generated with a single molecular constituent. Surface-confined assemblies formed from only the organic chromophore and PdCl(2) are known to follow linear growth, whereas the combination of polypyridyl complexes and PdCl(2) results in exponential growth. The present study demonstrates that an iterative deposition of both molecular building blocks with PdCl(2) results in an exponentially growing assembly. The nature of the assembly mechanism is dictated by the polypyridyl complex and overrides the linear growth process of the organic component. Relatively smooth, multicomponent SPMAs have been obtained with a thickness of ∼20 nm on silicon, glass, and indium-tin oxide (ITO) coated glass. Detailed information of the structure and of the surface-assembly chemistry were obtained using transmission optical (UV/Vis) spectroscopy, ellipsometry, atomic force microscopy (AFM), synchrotron X-ray reflectivity (XRR), and electrochemistry.
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Affiliation(s)
- Leila Motiei
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel
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Corrêa da Costa R, Buffeteau T, Guerzo AD, McClenaghan ND, Vincent JM. Reversible hydrocarbon/perfluorocarbon phase-switching of [Ru(bipy)3]2+ driven by supramolecular heteromeric fluorous carboxylate–carboxylic acid H-bond interactions. Chem Commun (Camb) 2011; 47:8250-2. [DOI: 10.1039/c1cc12641e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Motreff A, Belin C, Correa da Costa R, El Bakkari M, Vincent JM. Self-adaptive hydrophilic and coordinating Teflon surfaces through a straightforward physisorption process. Chem Commun (Camb) 2010; 46:6261-3. [DOI: 10.1039/c0cc01994a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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