Polarization Raman Imaging of Organic Monolayer Islands for Crystal Orientation Analysis

Moriyama, Toki; Umakoshi, Takayuki; Hattori, Yoshiaki; Taguchi, Koki; Verma, Prabhat; Kitamura, M.

doi:10.1021/acsomega.0c06313

Cited by 4 publications

(2 citation statements)

References 53 publications

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“…The signals were finally detected using a Peltier-cooled CCD camera (PIXIS_100BRX, Teledyne). Further details are described in our earlier reports. − We have also tried to obtain Raman spectra with COA-Cl solution. However, the concentration of COA-Cl solution could not be high enough for Raman measurements because the saturated concentration was as low as ∼10 mM.…”

Section: Methodsmentioning

confidence: 99%

Raman Spectroscopic and DFT Study of COA-Cl and Its Analogues

et al. 2023

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COA-Cl is a newly synthesized adenosine analogue that exhibits various physiological activities. Its angiogenic, neurotropic, and neuroprotective potencies make it promising for the development of medicines. In this study, we show Raman spectroscopic study of COA-Cl to elucidate molecular vibrations and related chemical properties. Density functional theory calculations were combined with the Raman spectroscopic data to understand the details of each vibrational mode. Comparative analysis with adenine, adenosine, and other nucleic acid analogues enabled identification of unique Raman peaks originating from the cyclobutane moiety and chloro group of COA-Cl. This study provides fundamental knowledge and crucial insights for further development of COA-Cl and related chemical species.

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Section: Methodsmentioning

confidence: 99%

Raman Spectroscopic and DFT Study of COA-Cl and Its Analogues

et al. 2023

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“…19 These anisotropy effects, originating from the vibrational symmetry and molecular orientation, are consistent with the molecular alignment in the specimen, which persists across the domain of a single fibre. 20 Grazing incidence wide-angle X-ray scattering (GIWAXS) analysis was performed on a thin film of fibres drop cast onto a silicon substrate, in order to further elucidate the molecular packing of VsA inside the fibres (Fig. 2b).…”

Section: Mainmentioning

confidence: 99%

Exerting pulling forces in fluids by directional disassembly of microcrystalline fibres

Kudernac,

Pantaleone,

Calicchia

et al. 2024

Preprint

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Bio-molecular polymerization motors are molecular systems that use supramolecular (de-)polymerization to mediate the conversion of chemical potential into useful mechanical work. Microcrystallization is ideally suited to reverse-engineer this strategy in artificial systems since self-organization of molecules in a crystal lattice resembles the process of polymer growth/disassembly but with increased predictability of molecular events in a highly ordered microscopic structure. With the intent to explore new chemo-mechanical transduction strategies, we developed a synthetic mechanically-active molecular system that can generate forces via controlled disassembly while being freely suspended in fluid. The amphiphilic monomer self-assembles into rigid, high-aspect ratio microcrystalline fibres with assembly regulated by a coumarin-based pH switching motif. In the structures formed, the crystal morphology determines the monomer reactivity at the interface, resulting in anisotropic etching of the fibres. This effect is used to exert directional pulling forces on microscopic beads adsorbed on the crystal surface through weak multivalent interactions. Mechanistic insights were provided by optical tweezers force spectroscopy, which quantified a stall force of 2.3 pN (+/- 0.1 pN) exerted by this ratcheting mechanism and the mechanical work produced by the disassembly of the fibres.

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Multimodal Microscopy of Partially Oriented para-Hexaphenylene Nanoaggregates

Balzer,

Fratschko,

Resel

et al. 2024

Langmuir

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Organic molecular beam deposition (OMBD) of para-hexaphenylene (p6P) on polycrystalline platinum results in the formation of unique nanoaggregates, predominantly as nanofibers and nanoribbons. These aggregates exhibit distinct morphological properties, as revealed by atomic force microscopy (AFM). Grazing incidence X-ray diffraction (GIXD) confirms the p6P herringbone structure as partially oriented aggregates with a bias of previously observed contact planes parallel to the substrate. The optical properties of the aggregates are analyzed using polarization microscopy, fluorescence microscopy, and Raman microscopy to distinguish three different aggregate types with a focus on aspects such as molecule orientation within the aggregates, including those lying and standing upright. Polarized microscopy indicates that the molecular orientation within the fluorescing, fiber-like aggregates is generally perpendicular to the long fiber axis and parallel to the substrate, which seems not to be the case for the other two types. This finding is crucial for applications utilizing p6P's polarized emission, such as in photonic and optoelectronic devices.

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Polarization Raman Imaging of Organic Monolayer Islands for Crystal Orientation Analysis

Cited by 4 publications

References 53 publications

Raman Spectroscopic and DFT Study of COA-Cl and Its Analogues

Raman Spectroscopic and DFT Study of COA-Cl and Its Analogues

Exerting pulling forces in fluids by directional disassembly of microcrystalline fibres

Multimodal Microscopy of Partially Oriented para-Hexaphenylene Nanoaggregates

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