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Morimoto K, Kitagawa D, Tong F, Chalek K, Mueller LJ, Bardeen CJ, Kobatake S. Correlating Reaction Dynamics and Size Change during the Photomechanical Transformation of 9‐Methylanthracene Single Crystals. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202114089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kohei Morimoto
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
| | - Daichi Kitagawa
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
| | - Fei Tong
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
- Present address: Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China
| | - Kevin Chalek
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Leonard J. Mueller
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Christopher J. Bardeen
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Seiya Kobatake
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
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Morimoto K, Kitagawa D, Tong F, Chalek K, Mueller LJ, Bardeen CJ, Kobatake S. Correlating Reaction Dynamics and Size Change during the Photomechanical Transformation of 9-Methylanthracene Single Crystals. Angew Chem Int Ed Engl 2021; 61:e202114089. [PMID: 34761506 DOI: 10.1002/anie.202114089] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Indexed: 01/16/2023]
Abstract
Photomechanical molecular crystals that expand under illumination could potentially be used as photon-powered actuators. In this study, we find that the use of high-quality single crystals of 9-methylanthracene (9MA) leads to more homogeneous reaction kinetics than that previously seen for polycrystalline samples, presumably due to a lower concentration of defects. Furthermore, simultaneous observation of absorbance and shape changes in single crystals revealed that the dimensional change mirrors the reaction progress, resulting in a smooth expansion of 7 % along the c-axis that is linearly correlated with reaction progress. The same expansion dynamics are highly reproducible across different single crystal samples. Organic single crystals exhibit well-defined linear expansions during 100 % photoconversion, suggesting that this class of solid-state phase change material could be used for actuation.
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Affiliation(s)
- Kohei Morimoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Daichi Kitagawa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Fei Tong
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA.,Present address: Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Kevin Chalek
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA
| | - Leonard J Mueller
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA
| | - Christopher J Bardeen
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA
| | - Seiya Kobatake
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
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Xavier P, Viswanath P. The Role of Molecular Packing in Dictating the Miscibility of Some Cholesteryl n-Alkanoates at Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11203-11211. [PMID: 34525810 DOI: 10.1021/acs.langmuir.1c01025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Cholesteryl n-alkanoates of saturated fatty acids and their mixtures are widely studied in different physical states and also due to their significance in biology. Here, we address the miscibility of some homologues of cholesteryl n-alkanoates at interfaces, which are known to exhibit different (cholesteryl octanoate, ChC8, and cholesteryl stearate, ChC18) or the same (cholesteryl nonanoate, ChC9, and cholesteryl laurate, ChC12) molecular packing in bulk. Surface manometry and Brewster angle microscopy studies on ChC8 (cholesteryl-cholesteryl interaction, referred to as m-i packing)/ChC9 (cholesteryl-chain interaction, referred to as m-ii packing) and also on ChC18 (chain-chain interactions, referred to as the crystalline bilayer)/ChC9 mixtures reveal phase separation at the air-water (A-W) interface plausibly due to the difference in the molecular packing. In contrast, ChC12/ChC9 (both m-ii packing) mixtures form a homogeneous phase and exhibit a higher collapse pressure (almost twice) than that of ChC9 indicating higher stability. At the air-solid (A-S) interface, the height profiles extracted from the surface topography images using an atomic force microscope yielded thicknesses of 3.6 ± 0.1 and 5.6 ± 0.1 nm for ChC18/ChC9 mixtures (at 0.66 and 0.5 mole fractions (MF)) corresponding to individual assembly, whereas a uniform thickness of 3.5 ± 0.2 nm is obtained for the case of ChC12/ChC9 mixtures (at 0.2, 0.5, and 0.8 MF) corresponding to m-ii packing. Ellipsometry studies reveal that the desorption temperature increases with the mole fraction of ChC9 and attains a maximum at 406.8 ± 4.8 K for 0.4 MF of ChC9, beyond which it decreases. Raman spectroscopy studies are carried out for ChC12/ChC9 mixtures in the homogeneous phase and in the collapsed state. Here, the dependency of peak positions on different physical states was assessed. Our studies offer new insights into the compatibility of molecular packing influencing the phase behavior and may be of relevance to tear film studies and on the formation of crystals in atherosclerosis.
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Affiliation(s)
- Pinchu Xavier
- Centre for Nano and Soft Matter Sciences, Shivanapura, Bengaluru 562 162, India
- Manipal Academy of Higher Education, Madhav Nagar, Manipal 576 104, India
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Perczyk P, Wójcik A, Wydro P, Broniatowski M. The role of phospholipid composition and ergosterol presence in the adaptation of fungal membranes to harsh environmental conditions-membrane modeling study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1862:183136. [PMID: 31751523 DOI: 10.1016/j.bbamem.2019.183136] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 09/30/2019] [Accepted: 10/28/2019] [Indexed: 01/18/2023]
Abstract
Soil fungi play an important role in the environment decomposing dead organic matter and degrading persistent organic pollutants (POP). The presence of hydrophobic POP in the soil and membrane-lytic substances excreted by competing microorganism to the soil solution is the constant threat to these organisms. To survive in the harsh environment and counteract these hazards the fungal cells have to strictly control the composition of the lipids in their cellular membranes. However, in the case of fungal membranes the correlation between their composition and physical properties is not fully understood. In our studies we applied Langmuir monolayers formed by phospholipids typical to fungal membranes and ergosterol as versatile model membranes. These membranes were characterized by the Langmuir technique, Brewster Angle Microscopy and Grazing Incidence X-ray Diffraction, as well as were exposed to the action of phospholipase A2 treated as a model membrane-lytic protein. We started our studies from the equimolar mixture of phosphatidylethanolamine with phosphatidylcholine and doped this matrix with phosphatidylserine (PS) or phosphatidylinositol (PI). It turned out that the membranes with PS were much more condensed at the mesoscale and periodically organized at the molecular level. Starting from these models we derived two families of model fungal membranes adding to these phospholipid matrices ergosterol. It turned out that the level of ergosterol content is of crucial importance for the model membrane structure and its durability. Changing the ergosterol mole ratio from 0 to 0.5 we defined and described in detail four different 2D crystalline phases.
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Affiliation(s)
- Paulina Perczyk
- Department of Environmental Chemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Aneta Wójcik
- Department of Environmental Chemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Paweł Wydro
- Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Marcin Broniatowski
- Department of Environmental Chemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland.
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Ratajczak MK, Chi EY, Frey SL, Cao KD, Luther LM, Lee KYC, Majewski J, Kjaer K. Ordered nanoclusters in lipid-cholesterol membranes. PHYSICAL REVIEW LETTERS 2009; 103:028103. [PMID: 19659249 DOI: 10.1103/physrevlett.103.028103] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2008] [Indexed: 05/28/2023]
Abstract
X-ray diffraction of sphingomyelin-dihydrocholesterol (SM-DChol) monolayers revealed short-ranged ( approximately 25 A) 2D ordering. These nanoclusters show two distinct regions: below the cusp point of the phase diagram (35 mol% DChol), a constant d spacing was observed; above the cusp, the d spacing increases linearly with DChol in accordance to Vegard's law for binary alloys. The components in this lipidic alloy are thus a 65ratio35 SM-DChol entity and excess DChol. Reflectivity data further support the emergence above the cusp of an uncomplexed DChol population with greater vertical mobility.
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Affiliation(s)
- Maria K Ratajczak
- Department of Physics, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, USA
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Lilley SJ, Andreev YG, Bruce PG. Ionic Conductivity in Crystalline PEO6:Li(AsF6)1-x(SbF6)x. J Am Chem Soc 2006; 128:12036-7. [PMID: 16967931 DOI: 10.1021/ja063091u] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ionic conductivity of PEO6:LiXF6 (X = As, Sb) complexes may be raised by over an order of magnitude by forming solid solutions of PEO6:Li(AsF6)1-x(SbF6)x.
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Affiliation(s)
- Scott J Lilley
- School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, Scotland
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McCourt MP, Li N, Pangborn WA, Miller R, Weeks CM, Dorset DL. Crystallography of Linear Molecule Binary Solids. X-ray Structure of a Cholesteryl Myristate/Cholesteryl Pentadecanoate Solid Solution. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9537116] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mary P. McCourt
- Electron Diffraction Department and Molecular Biophysics Department, Hauptman-Woodward Medical Research Institute, 73 High Street, Buffalo, New York 14203, and Computer Science Department, State University of New York at Buffalo, Amherst, New York 14260
| | - Niayin Li
- Electron Diffraction Department and Molecular Biophysics Department, Hauptman-Woodward Medical Research Institute, 73 High Street, Buffalo, New York 14203, and Computer Science Department, State University of New York at Buffalo, Amherst, New York 14260
| | - Walter A. Pangborn
- Electron Diffraction Department and Molecular Biophysics Department, Hauptman-Woodward Medical Research Institute, 73 High Street, Buffalo, New York 14203, and Computer Science Department, State University of New York at Buffalo, Amherst, New York 14260
| | - Russ Miller
- Electron Diffraction Department and Molecular Biophysics Department, Hauptman-Woodward Medical Research Institute, 73 High Street, Buffalo, New York 14203, and Computer Science Department, State University of New York at Buffalo, Amherst, New York 14260
| | - Charles M. Weeks
- Electron Diffraction Department and Molecular Biophysics Department, Hauptman-Woodward Medical Research Institute, 73 High Street, Buffalo, New York 14203, and Computer Science Department, State University of New York at Buffalo, Amherst, New York 14260
| | - Douglas L. Dorset
- Electron Diffraction Department and Molecular Biophysics Department, Hauptman-Woodward Medical Research Institute, 73 High Street, Buffalo, New York 14203, and Computer Science Department, State University of New York at Buffalo, Amherst, New York 14260
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8
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Dorset DL, Annis BK. Lamellar Order and the Crystallization of Linear Chain Solid Solutions. Macromolecules 1996. [DOI: 10.1021/ma9514277] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Douglas L. Dorset
- Electron Diffraction Department, Hauptman−Woodward Medical Research Institute, Inc., 73 High St., Buffalo, New York 14203
| | - Brian K. Annis
- Chemical and Analytical Sciences Dvision, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831
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9
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Guo W, Hamilton JA. Phase behavior and crystalline structures of cholesteryl ester mixtures: a C-13 MASNMR study. Biophys J 1995; 68:2376-86. [PMID: 7647242 PMCID: PMC1282148 DOI: 10.1016/s0006-3495(95)80420-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Cholesteryl esters are a transport and storage form of cholesterol in normal physiology but also a significant lipid in atherosclerotic plaques. To understand better the molecular properties of cholesteryl esters in tissues and plaques, we have studied the polymorphic and mesomorphic features of pure and mixed cholesteryl esters by solid state C-13 NMR with magic angle sample spinning (MASNMR). The temperature-dependent properties of two single components (cholesteryl linoleate (CL, C18:2) and cholesteryl linolenate (CLL, C18:3)), four binary systems (cholesteryl palmitate (CP, C16:0) with CL, CLL or cholesteryl oleate (CO, C18:1), and CO/CL), one ternary system (CO/CP/CL), and one quaternary system (CO/CP/CL/CLL) were studied. The mixing ratios were based on the composition of an atherosclerosis plaque dissected from a cholesterol-fed New Zealand white rabbit. C-13 MASNMR determined the phase transition temperatures, identified the phases present in all systems, and provided novel information about molecular structures. For example, solid CL exhibited a disordered structure with multiple molecular conformations, whereas pure CLL had a crystalline structure different from the three most commonly characterized forms (MLII, MLI, BL). In binary mixtures, the crystalline structure of each cholesteryl ester species was identified by its own characteristic resonances. It was found that CP always existed in its native BL form, but CL and CO were influenced by the composition of the mixture. CL was induced to form MLII crystals by the coexisting CP (55 wt%). When CO was cooled from the isotropic phase, it existed as a mixture of MLII and an amorphous form. The presence of CP significantly accelerated the conversion of the amorphous form to the MLII form. For the ternary mixture co-dried from chloroform, CL cocrystallized with CO in the MLII form and CP existed in BL form. Addition of a small amount of CLL slightly increased the heterogeneity of the solid mixture, but had little effect on the crystal structures or the phase transitions. C-13 MASNMR represents a powerful method for physical characterization of cholesteryl ester mixtures reflecting the composition of biological samples.
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Affiliation(s)
- W Guo
- Biophysics Department, Boston University School of Medicine, Massachusetts 02118, USA
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Dorset DL. Direct determination of layer packing for a phospholipid solid solution at 0.32-nm resolution. Proc Natl Acad Sci U S A 1994; 91:4920-4. [PMID: 8197158 PMCID: PMC43901 DOI: 10.1073/pnas.91.11.4920] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Electron diffraction intensity data were collected from a 2:3 binary solid solution of two homologous phosphatidylethanolamines (1,2-dimyristoyl-sn-glycerophosphoethanolamine and 1,2-dipalmitoyl-sn-glycerophosphoethanolamine) epitaxially oriented by cocrystallization with naphthalene. The layer packing was determined directly by predicting the value of 12 of the 17 phases from sigma 1- and sigma 2-triplet invariants in space group P1. A reverse Fourier transform of the resulting potential maps provides estimates for three other phases and the two remaining ones were found by generating maps for the 2(2) = 4 possible phase combinations and then testing the smoothness of the potential profile of the hydrocarbon chain packing. The same phase solution can be found by translating a molecular model (based on the known x-ray crystal structure of a shorter homologue) past the unit cell origin. The solid solution is found to retain a stable polar group packing while the statistical occupancy of two terminal-chain carbons is expressed by a reduced potential profile at the nonpolar interface at the bilayer center.
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Affiliation(s)
- D L Dorset
- Electron Diffraction Department, Medical Foundation of Buffalo, Inc., NY 14203
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11
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McCourt M, Strong P, Pangborn W, Dorset D. Structural determination and packing analysis of a cholesteryl caprate/cholesteryl laurate solid solution. J Lipid Res 1994. [DOI: 10.1016/s0022-2275(20)41172-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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12
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Electron Crystallography of Organic Molecules. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/s0065-2539(08)60548-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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