Spectroscopy of Complex Monolayers

Möbius, Dietmar

doi:10.1007/978-1-4899-3716-2_5

Cited by 8 publications

(2 citation statements)

References 156 publications

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“…The trough was enclosed in a dark cabinet and thermoregulated within ±0.5 °C using a circulating water bath. Reflectivity at normal incidence was measured differentially between the monolayer covered interface and the monolayer free interface behind the compression barrier …”

Section: Methodsmentioning

confidence: 99%

Influence of Substrate Properties on the Topochemical Polymerization of Diacetylene Monolayers

et al. 2001

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The influence of the underlying substrate on the UV initiated polymerization of diacetylene lipid monolayers was investigated using absorption spectroscopy and Brewster angle microscopy (BAM). The lipid/substrate affinity was tuned through choice of lipid headgroup as well as substrate properties. Lipids with positively charged headgroups, which readily polymerized in both blue (6 °C) and red (16 °C) polymer forms at the air/water interface, failed to polymerize when transferred to glass or hydrophobic glass (headgroups facing ambient) at either temperature. BAM analysis revealed that the diacetylene film was disordered on hydrophobic glass, which likely impeded the topochemical polymerization. On glass, however, BAM showed a highly crystalline film identical to that seen at the air/water interface, suggesting that strong interactions between the positively charged lipid headgroups and the glass inhibited polymerization in this case. In agreement, when the lipid/substrate interactions were reduced, either by introducing a cadmium arachidate bilayer between the diacetylene film and the glass or by substituting mica for glass, a limited polymerization occurred, forming the red film exclusively. As a further test, monolayers of acidic diacetylene lipids were deposited on glass. In this case polymerization was possible in both blue and red forms but diminished as the transferred film was aged. These results suggest that a strong lipid/substrate affinity may impede the topochemical polymerization, possibly by restricting the mobility of the lipids. By investigating polymerization as a function of substrate and headgroup chemistry, several factors influencing the lability of diacetylene films toward topochemical polymerization are presented.

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Section: Methodsmentioning

confidence: 99%

Influence of Substrate Properties on the Topochemical Polymerization of Diacetylene Monolayers

et al. 2001

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“…Methods to measure the in situ FL from Langmuir monolayer has been reported so far and we have also reported using similar methods . The surface‐reflective FL emission spectra were measured using a photodiode array‐equipped spectrometer (Otsuka Electronics, model MCPD‐9800) with an excitation wavelength shown.…”

Section: Methodsmentioning

confidence: 99%

Monitoring Fluorescence Response of Amphiphilic Flapping Molecules in Compressed Monolayers at the Air–Water Interface

Nakanishi

Saito

Sakamoto

et al. 2019

Chemistry An Asian Journal

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The air-water interface, which is the boundary of two phases with alarge difference in polarity, gives adistinct environmentc ompared with bulk water or air.S ince the interface provides af ield for various biomolecules to work, it is importantt ou nderstand the molecular behaviors at the interface. Here, polarity-independentf lapping viscosity probes (FLAP) equipped with hydrophobic/hydrophilic substituents have been synthesized and studied at the airwater interface. In situ fluorescence( FL), which is related to the internal motion and orientation, of three different FLAPs were investigated att he interface, and the internal motion of the molecule was indicated to be suppressed at the interface. In addition, the molecular response was compared with that of conventional viscosity probes (molecular rotors), which indicatest he different behaviors of FLAP probably due to the distinct molecular orientation as wella sm olecular motion.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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