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Frandsen BN, Vaida V. Spectroscopy of Retinoic Acid at the Air-Water Interface. J Phys Chem A 2022; 126:6908-6919. [PMID: 36129815 DOI: 10.1021/acs.jpca.2c04873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The spectroscopy of all-trans-retinoic acid (ATRA), an important molecule of biological origin that can be found in nature, is investigated at the air-water interface using UV-Vis and IR reflection spectroscopy. We employ a UV-Vis reflection absorption spectroscopy (RAS) experiment along with infrared reflection absorption spectroscopy (IR-RAS) to probe ATRA at the air-water interface. We elucidate the factors influencing the spectroscopy of ATRA at the air-water interface and compare its spectra at the water surface with results of bulk samples obtained with conventional spectroscopic methods and computational chemistry. Monolayers of pure ATRA as well as mixed ATRA with stearic-d35 acid were prepared, and the spectroscopy reveals that ATRA forms J-aggregates with itself, causing a significant redshift of its S0 to S1 electronic transition. Pure ATRA monolayers are found to be unstable at the air-water interface and are lost from the surface over time due to the formation of aggregates. The mixture of ATRA and stearic-d35 acid has been shown to stabilize the monolayers and inhibit the loss of surface ATRA. On the basis of our observations, we propose that ATRA could be a significant photosensitizer in natural aqueous environments.
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Affiliation(s)
- Benjamin N Frandsen
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States.,Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, UCB 216, Boulder, Colorado 80309, United States
| | - Veronica Vaida
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States.,Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, UCB 216, Boulder, Colorado 80309, United States
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Hupfer ML, Koszarna B, Ghosh S, Gryko DT, Presselt M. Langmuir-Blodgett Films of Diketopyrrolopyrroles with Tunable Amphiphilicity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10272-10278. [PMID: 34405682 DOI: 10.1021/acs.langmuir.1c01113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this work, we present the formation of H- and J-aggregates of amphiphilic centrosymmetric diketopyrrolopyrroles containing aliphatic or aromatic amino groups. The inherent amphiphilicity of these dyes predestines their assembly at interfaces to form ordered supramolecular structures. In this work, we employed the Langmuir-Blodgett (LB) technique to generate, manipulate, and deposit such supramolecular structures. The aforementioned amines provide an additional means to control the formation of the supramolecular assemblies. In the resulting LB films, both H- and J-aggregates of the dyes can be realized, leading to very broad absorption spectra. In contrast to many reports on H- and J-aggregates, the interactions between the symmetric diketopyrrolopyrroles are controlled via interface assembly and π-stacking and not by dipolar interactions. We show that in the case of the aliphatic, but not for the aromatic amine functionalization, the usage of an acidic subphase enables the transition from H- to J-aggregate-dominated LB films via an increase in the surface pressure during deposition.
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Affiliation(s)
- Maximilian L Hupfer
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
- Institute of Physical Chemistry, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Beata Koszarna
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Soumik Ghosh
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
- SciClus GmbH & Co. KG, Moritz-von-Rohr-Str. 1a, 07745 Jena, Germany
| | - Daniel T Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Martin Presselt
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
- Institute of Physical Chemistry, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
- SciClus GmbH & Co. KG, Moritz-von-Rohr-Str. 1a, 07745 Jena, Germany
- Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
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Michailov A, Povolotskiy A, Kuzmin V. Angular invariance of the contribution of an anisotropic thin surface layer to reflectance and reflectance-absorbance. OPTICS EXPRESS 2021; 29:3090-3096. [PMID: 33770915 DOI: 10.1364/oe.413642] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 01/04/2021] [Indexed: 06/12/2023]
Abstract
The absorbance studies of the optical radiation reflection from the boundary of two soft-matter media with a thin monolayer between are performed for a number of angles of incidence. The reflectance and absorbance spectra are described in terms of a unique spectrum invariant with respect to the incidence angles. The angular dependence of the absorbance for s-polarized radiation is shown to not provide any extra information as compared with a single-angle study in line with the previously developed theoretical considerations. We verify it experimentally performing the multi-angle infrared reflection-absorption spectroscopy measurements at the air-water interface with a thin lipid film.
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Rubia-Payá C, de Miguel G, Martín-Romero MT, Giner-Casares JJ, Camacho L. UV-Vis Reflection-Absorption Spectroscopy at air-liquid interfaces. Adv Colloid Interface Sci 2015; 225:134-45. [PMID: 26385430 DOI: 10.1016/j.cis.2015.08.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 08/27/2015] [Accepted: 08/27/2015] [Indexed: 11/26/2022]
Abstract
UV-Visible Reflection-Absorption Spectroscopy (UVRAS) technique is reviewed with a general perspective on fundamental and applications. UVRAS is formally identical to IR Reflection-Absorption Spectroscopy (IRRAS), and therefore, the methodology developed for this IR technique can be applied in the UV-visible region. UVRAS can be applied to air-solid, air-liquid or liquid-liquid interfaces. This review focuses on the use of UVRAS for studying Langmuir monolayers. We introduce the theoretical framework for a successful understanding of the UVRAS data, and we illustrate the usage of this data treatment to a previous study from our group comprising an amphiphilic porphyrin. For ultrathin films with a thickness of few nm, UVRAS produces positive or negative bands when p-polarized radiation is used, depending on the incidence angle and the orientation of dipole absorption. UVRAS technique provides highly valuable information on tilt of chromophores at the air-liquid interface, and moreover allows the determination of optical parameters. We propose UVRAS as a powerful technique to investigate the in situ optical properties of Langmuir monolayers.
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Rubia-Payá C, Giner-Casares JJ, de Miguel G, Martín-Romero MT, Möbius D, Camacho L. Aggregation and structural study of the monolayers formed by an amphiphilic thiapentacarbocyanine. RSC Adv 2015. [DOI: 10.1039/c5ra05192d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Exotic assemblies with unique photophysical features can be built based on organic dyes at the air–liquid interface.
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Affiliation(s)
- Carlos Rubia-Payá
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - Juan J. Giner-Casares
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - Gustavo de Miguel
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - María T. Martín-Romero
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - Dietmar Möbius
- Max-Planck-Institut für biophysikali Chemie
- Göttingen
- Germany
| | - Luis Camacho
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
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