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Sun L, Wang Y, Zhao Y, Qiu Y. A theoretical study on the second-order nonlinear optical properties of Pt(II) bis-acetylide complexes: substituent and redox effects. Phys Chem Chem Phys 2024; 26:6862-6871. [PMID: 38329283 DOI: 10.1039/d3cp04418a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Density functional theory studies on the geometric and electronic structures, UV-vis absorption spectra, and second-order nonlinear optical (NLO) properties of four-coordinate Pt(II) bis-acetylide complexes, cis-[Pt(CNtBu)(ADC)(CCR)2] , have been employed. The effects of ligand variation and the single electron redox process on the structures and NLO response of complexes have also been investigated. It shows that the variations of the ligand and electron have little effect on the geometries of the complexes, but there is a significant effect on their electronic structures and NLO responses. The introduction of a single -NO2 group in acetylide ligands increases the first hyperpolarizability of complex 12 times, while one electron lost in five complexes enhances the first hyperpolarizability 496 times at the most. Both methods are considered effective ways for improving the NLO response of Pt(II) bis-acetylide complexes. Based on the analysis of the electronic and optical properties of fifteen studied complexes, the increase of NLO response is mainly ascribed to strong oscillator strengths, lower electron transition energy, and well-directed effective charge transfer. This work reveals some underlying relationships between the NLO responses and electronic structures of complexes, which is helpful for the design and synthesis of high-performance NLO materials of Pt(II) bis-acetylide complexes.
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Affiliation(s)
- Liting Sun
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China.
| | - Yingying Wang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China.
| | - Yuanyuan Zhao
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China.
| | - Yongqing Qiu
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China.
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2
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Wang Y, Chen Y, Zhao Y, Qiu Y. Substituent and redox effects on the second-order NLO response of Ru( ii) complexes with polypyridine ligands: a theoretical study. NEW J CHEM 2023. [DOI: 10.1039/d3nj00594a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Modifying ligands in four studied Ru(II) complexes have slight influence on their static first hyperpolarizabilities (βtot) values. However, the βtot values of complexes 1+/−–4+/− are all enhanced and the largest βtot value is observed for complex 4−.
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3
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Hou N, Fang XH. Influence of Alkali Metal Doping and BN Substitution on the Second-Order Nonlinear Optical Properties of Graphyne: A Theoretical Perspective. Inorg Chem 2022; 61:10756-10767. [PMID: 35794725 DOI: 10.1021/acs.inorgchem.2c00970] [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 electronic and nonlinear optical (NLO) properties of BN-substituted graphynes and the corresponding alkali-doped hybrid systems have been determined using density functional theory. When the carbon atoms in the graphyne are replaced by BN pairs, the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap (Egap) increases to some extent, and the static first hyperpolarizabilities (β0) of the novel systems hardly increase. However, when an alkali atom is introduced on the surface of BN-substituted graphyne, the doping effect can effectively modulate the electronic and NLO properties. Doping the alkali atom can significantly narrow the wide Egap of BN-substituted graphynes in the range of 1.03-2.03 eV. Furthermore, the doping effect brings considerable β0 values to these alkali-doped systems, which are 52-3609 au for Li-doped systems and 3258-211 053 au for Na/K-doped ones. The result reveals that the β0 values of alkali-doped complexes are influenced by the atomic number of alkali metals and the proportion of BN pairs. The nature of the excellent NLO responses of alkali-doped complexes can be understood by the low excitation energy of the crucial excited state and the analysis of the first hyperpolarizability density. Besides, these alkali-doped complexes have a deep-ultraviolet working region. Therefore, the combined effect of alkali metal doping and BN substitution can be an excellent strategy to design novel high-performance NLO materials based on graphyne.
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Affiliation(s)
- Na Hou
- Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, China
| | - Xiao-Hui Fang
- Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, China
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4
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Yao Y, Xu HL, Qiu YQ, Su ZM. The second-order nonlinear optical property of hydrazones-based photochromic complexes: A DFT study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114882] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Ellestad G, Zask A, Berova N. The enduring legacy of Koji Nakanishi's research on bioorganic chemistry and natural products. Part 1: Isolation, structure determination and mode of action. Chirality 2020; 32:632-651. [PMID: 32157754 DOI: 10.1002/chir.23214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/11/2020] [Accepted: 02/12/2020] [Indexed: 01/09/2023]
Abstract
In this brief review on Koji Nakanishi's remarkable career in natural products chemistry, we have highlighted a number of his accomplishments that illustrate the broad diversity of his interests. These include the isolation, structure determination, and biological mechanism of action of many natural products including the triterpenoid pristimerin; the diterpenoid ginkgolides; insect and crustacean molting hormones; phytoalexins; the toxic red tide principle brevetoxin; the vanadium tunicate pigments; philanthotoxin from killer wasps; antisickling agents; mitomycin DNA adducts; insect antifeedants; a mitotic hormone, the small molecule fish attractants from the sea anemone; new isolation and purification technologies; molecular chemistry of vision; age-related macular degeneration; and the development of the exciton circular dichroism (CD) chirality method for microscale determination of absolute configuration of natural products and chirality of other chiral molecules and supramolecular assembly.
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Affiliation(s)
- George Ellestad
- Department of Chemistry, Columbia University, New York, New York
| | - Arie Zask
- Department of Biological Sciences, Columbia University, New York, New York
| | - Nina Berova
- Department of Chemistry, Columbia University, New York, New York
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6
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Interaction of antitubercular drug candidates with α 1-acid glycoprotein produced in pulmonary granulomas. Int J Biol Macromol 2019; 147:1318-1327. [PMID: 31759028 DOI: 10.1016/j.ijbiomac.2019.10.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 10/09/2019] [Accepted: 10/09/2019] [Indexed: 11/24/2022]
Abstract
The intracellular pathogen Mycobacterium tuberculosis can survive and replicate within host macrophages. Among various immunomodulatory substances, macrophages also produce α1-acid glycoprotein (AAG) which is secreted into the extracellular matrix of tuberculosis granulomas that represents a specific binding environment. Employing circular dichroism (CD) and UV/VIS absorption spectroscopic methods, we demonstrated and evaluated the AAG binding properties of novel antitubercular drug candidates developed against sensitive and multidrug-resistant strains of M. tuberculosis. As inferred from the CD spectroscopic data, these chemically diverse organic molecules are engulfed within the β-barrel of the protein either in a monomeric or dimeric form. Molecular docking simulations suggested the importance of H-bonds and ligand-aromatic residue π-π stacking interactions in stabilizing the drug molecules at the protein binding site. Based on the estimated Kd values (7-20 μM), AAG could be considered as the significant binding partner of the antitubercular agents studied herein. As such, it may affect the drug distribution and bioavailability not only in serum but also in macrophages and in the extracellular matrix of tuberculosis granulomas.
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7
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Theoretical exploration of second-order nonlinear optical properties of mono- and bimetallic Pt(II) dithienylcyclopentene complexes: Ligands and photoisomerization effect. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.03.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Paulikat M, Wechsler C, Tittmann K, Mata RA. Theoretical Studies of the Electronic Absorption Spectra of Thiamin Diphosphate in Pyruvate Decarboxylase. Biochemistry 2017; 56:1854-1864. [PMID: 28296385 DOI: 10.1021/acs.biochem.6b00984] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electronic absorption spectra are oftentimes used to identify reaction intermediates or substrates/products in enzymatic systems, as long as absorption bands can be unequivocally assigned to the species being studied. The latter task is far from trivial given the transient nature of some states and the complexity of the surrounding environment around the active site. To identify unique spectral fingerprints, controlled experiments with model compounds have been used in the past, but even these can sometimes be unreliable. Circular dichroism (CD) and ultraviolet-visible spectra have been tools of choice in the study of the rich chemistry of thiamin diphosphate-dependent enzymes. In this study, we focus on the Zymomonas mobilis pyruvate decarboxylase, and mutant analogues thereof, as a prototypical representative of the thiamin diphosphate (ThDP) enzyme superfamily. Through the use of electronic structure methods, we analyze the nature of electronic excitations in the cofactor. We find that all the determining CD bands around the 280-340 nm spectral range correspond to charge-transfer excitations between the pyrimidine and thiazolium rings of ThDP, which, most likely, is a general property of related ThDP-dependent enzymes. While we can confirm the assignments of previously proposed bands to chemical states, our calculations further suggest that a hitherto unassigned band of enzyme-bound ThDP reports on the ionization state of the canonical glutamate that is required for cofactor activation. This finding expands the spectroscopic "library" of chemical states of ThDP enzymes, permitting a simultaneous assignment of both the cofactor ThDP and the activating glutamate. We anticipate this finding to be helpful for mechanistic analyses of related ThDP enzymes.
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Affiliation(s)
- Mirko Paulikat
- Institute of Physical Chemistry, University of Goettingen , Tammannstraße 6, D-37077 Göttingen, Germany
| | - Cindy Wechsler
- Department of Molecular Enzymology, Albrecht-von-Haller-Institute for Plant Sciences, and Göttingen Center for Molecular Biosciences, University of Goettingen , Julia-Lermontowa-Weg 3, D-37077 Göttingen, Germany
| | - Kai Tittmann
- Department of Molecular Enzymology, Albrecht-von-Haller-Institute for Plant Sciences, and Göttingen Center for Molecular Biosciences, University of Goettingen , Julia-Lermontowa-Weg 3, D-37077 Göttingen, Germany
| | - Ricardo A Mata
- Institute of Physical Chemistry, University of Goettingen , Tammannstraße 6, D-37077 Göttingen, Germany
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9
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Wang HQ, Wang L, Li RR, Ye JT, Chen ZZ, Chen H, Qiu YQ, Xie HM. Second-Order Nonlinear Optical Properties of Carboranylated Square-Planar Pt(II) Zwitterionic Complexes: One-/Two-Dimensional Difference and Substituent Effect. J Phys Chem A 2016; 120:9330-9340. [DOI: 10.1021/acs.jpca.6b09797] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Hong-Qiang Wang
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
| | - Li Wang
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
| | - Rong-Rong Li
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
| | - Jin-Ting Ye
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
| | - Zhen-Zhen Chen
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
| | - He Chen
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
| | - Yong-Qing Qiu
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
| | - Hai-Ming Xie
- Institute of Functional Material Chemistry, Faculty of Chemistry, and ‡National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
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10
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Chen H, Wang WY, Wang L, Zhu CL, Fang XY, Qiu YQ. Ion-π interaction in impacting the nonlinear optical properties of ion-buckybowl complexes. J Mol Graph Model 2016; 64:139-146. [PMID: 26851864 DOI: 10.1016/j.jmgm.2016.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 01/20/2016] [Accepted: 01/21/2016] [Indexed: 10/22/2022]
Abstract
Ion-buckybowl complexes have received considerable attention in modern chemical research due to its fundamental and practical importance. Herein, we performed density functional theory (DFT) to calculate the geometical structure, binding interactions, dipole moments and the first hyperpolarizabilities (βtot) of ion-buckybowl complexes (ions are Cl(-) and Na(+), buckybowls are quadrannulene, corannulene and sumanene). It is found that the stabilities of ion-buckybowl compounds primarily originate from the interaction energy, which was proved by a new isomerization energy decomposition analysis approach. Plots of reduced density gradient mirror the ion-π weak interaction has been formed between the ions and buckybowls. Significantly, the buckybowl subunits cannot effectively impact the nonlinear optical (NLO), but the kind of ion has marked influence on the second-order NLO responses. The βtot values of Cl(-)-buckybowl complexes are all larger as compared to that of Na(+)-buckybowl complexes, which is attributed to the large charge-transfer (CT) from Cl(-) to buckybowl. Our present work will be beneficial for further theoretical and experimental studies on the NLO properties of ion-buckybowl compounds.
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Affiliation(s)
- He Chen
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Wen-Yong Wang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Li Wang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Chang-Li Zhu
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Xin-Yan Fang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Yong-Qing Qiu
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China.
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11
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Chen H, Wang L, Wang WY, Qiu YQ, Xie HM. The effect of heterocyclic π bridges on second order nonlinear optical properties of compounds formed between ferrocenyl and corannulenyl. RSC Adv 2016. [DOI: 10.1039/c6ra22020g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Among D–π–A type compounds, when imidazole acts as a π bridge (endo/exo-3), the βtot values are almost 2 times as large as when the phenyl acts as a π bridge (endo/exo-2).
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Affiliation(s)
- He Chen
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- China
| | - Li Wang
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- China
| | - Wen-Yong Wang
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- China
| | - Yong-Qing Qiu
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- China
| | - Hai-Ming Xie
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- China
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12
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Wakabayashi M, Yokojima S, Fukaminato T, Ohtani H, Nakamura S. Anisotropic elliptical dichroism and influence of imperfection of circular polarization upon anisotropic circular dichroism. J Chem Phys 2015; 142:154102. [PMID: 25903861 DOI: 10.1063/1.4917174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In spite of the importance of anisotropic circular dichroism, in practice, it is difficult to get rid of the artifacts that arise from the imperfection of the circular polarization. Undesirable linear dichroism, interference of two orthogonal polarization states, and linear birefringence prevent us from making accurate measurements. We propose a theoretical method for evaluating the contributions of the first two, which are thought to be the main artifacts when specimens are not thick enough. Using the time-dependent perturbation theory and taking into account the direction of light propagation toward an orientationally fixed molecule, we formulated the transition probability of systems perturbed by arbitrarily polarized light and the absorption difference associated with two kinds of polarized light. We also formulated, as an extension of the dissymmetry factor of circular dichroism, a newly defined dissymmetry factor associated with two arbitrary polarization states. Furthermore, we considered a mixed-state of photon ensemble in which polarization states distribute at a certain width around a certain average. Although the purity of polarization and ellipticity does not correspond immediately, by considering the mixed state it is possible to treat them consistently. We used quantum statistical mechanics to describe the absorption difference for two kinds of photon ensembles and applied the consequent formula to examine the reported experimental results of single-molecule chiroptical responses under discussion in the recent past. The artifacts are theoretically suggested to be sensitive to the incident direction of elliptically polarized light and to the oriented systems, the ellipticity, and the orientation of ellipse. The mixed state has little, if any, effect when the polarization state distribution is narrow.
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Affiliation(s)
- Masamitsu Wakabayashi
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan
| | - Satoshi Yokojima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachiouji-shi, Tokyo 192-0392, Japan
| | - Tuyoshi Fukaminato
- Research Institute for Electronic Science, Hokkaido University, N20, W10, Kita-ku, Sapporo 001-0020, Japan
| | - Hiroyuki Ohtani
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan
| | - Shinichiro Nakamura
- RIKEN, Research Cluster for Innovation, Nakamura Lab, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Valsson O, Filippi C, Casida ME. Regarding the use and misuse of retinal protonated Schiff base photochemistry as a test case for time-dependent density-functional theory. J Chem Phys 2015; 142:144104. [DOI: 10.1063/1.4916354] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Tian DM, Ma NN, Wang WY, Wang J, Zhu CL, Qiu YQ. Mechanistic insight into the second-order nonlinear optical properties of Ru-coordinated DTE complexes: Photoisomerization, redox, and protonation switches. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.09.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Pescitelli G, Kato HE, Oishi S, Ito J, Maturana AD, Nureki O, Woody RW. Exciton circular dichroism in channelrhodopsin. J Phys Chem B 2014; 118:11873-85. [PMID: 25247388 DOI: 10.1021/jp505917p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Channelrhodopsins (ChRs) are of great interest currently because of their important applications in optogenetics, the photostimulation of neurons. The absorption and circular dichroism (CD) spectra of C1C2, a chimera of ChR1 and ChR2 of Chlamydomonas reinhardtii, have been studied experimentally and theoretically. The visible absorption spectrum of C1C2 shows vibronic fine structure in the 470 nm band, consistent with the relatively nonpolar binding site. The CD spectrum has a negative band at 492 nm (Δε(max) = -6.17 M(-1) cm(-1)) and a positive band at 434 nm (Δε(max) = +6.65 M(-1) cm(-1)), indicating exciton coupling within the C1C2 dimer. Time-dependent density functional theory (TDDFT) calculations are reported for three models of the C1C2 chromophore: (1) the isolated protonated retinal Schiff base (retPSB); (2) an ion pair, including the retPSB chromophore, two carboxylate side chains (Asp 292, Glu 162), modeled by acetate, and a water molecule; and (3) a hybrid quantum mechanical/molecular mechanical (QM/MM) model depicting the binding pocket, in which the QM part consists of the same ion pair as that in (2) and the MM part consists of the protein residues surrounding the ion pair within 10 Å. For each of these models, the CD of both the monomer and the dimer was calculated with TDDFT. For the dimer, DeVoe polarizability theory and exciton calculations were also performed. The exciton calculations were supplemented by calculations of the coupling of the retinal transition with aromatic and peptide group transitions. For the dimer, all three methods and three models give a long-wavelength C2-axis-polarized band, negative in CD, and a short-wavelength band polarized perpendicular to the C2 axis with positive CD, differing in wavelength by 1-5 nm. Only the retPSB model gives an exciton couplet that agrees qualitatively with experiment. The other two models give a predominantly or solely positive band. We further analyze an N-terminal truncated mutant because it was assumed that the N-terminal domain has a crucial role in the dimerization of ChRs. However, the CD spectrum of this mutant has an exciton couplet comparable to that of the wild-type, demonstrating that it is dimeric. Patch-clamp experiments suggest that the N-terminal domain is involved in protein stabilization and channel kinetics rather than dimerization or channel activity.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Moruzzi 3, I-56124 Pisa, Italy
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16
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Wang WY, Ma NN, Sun SL, Qiu YQ. Impact of Redox Stimuli on Ferrocene–Buckybowl Complexes: Switchable Optoelectronic and Nonlinear Optical Properties. Organometallics 2014. [DOI: 10.1021/om500224g] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wen-Yong Wang
- Institute of Functional Material
Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Na-Na Ma
- Institute of Functional Material
Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Shi-Ling Sun
- Institute of Functional Material
Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Yong-Qing Qiu
- Institute of Functional Material
Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
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17
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Wakabayashi M, Yokojima S, Fukaminato T, Shiino KI, Irie M, Nakamura S. Anisotropic dissymmetry factor, g: theoretical investigation on single molecule chiroptical spectroscopy. J Phys Chem A 2014; 118:5046-57. [PMID: 24919679 DOI: 10.1021/jp409559t] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A formula for an anisotropic dissymmetry factor g evaluating the chiroptical response of orientationally fixed molecules is derived. Incorporating zeroth- and first-order multipole expansion terms, it is applied to bridged triarylamine helicene molecules to examine the experimental results of single-molecule chiroptical spectroscopy. The ground- and excited-state wave functions and a series of transition moments required for the evaluation of the anisotropic g value are calculated using time-dependent density functional theory (TDDFT). The probability histograms obtained for simulated g values, uniformly sampled in regard to the direction of light propagation toward the fixed molecule, show that even for a given diastereomer, the dissymmetry factors have positive and negative values and can deviate from their averages to a considerable extent when the angle between the electric dipole transition moment and the propagation vector of the incident light is near 0 or 180°.
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Affiliation(s)
- Masamitsu Wakabayashi
- Department of Biomolecular Engineering, Tokyo Institute of Technology , 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan
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18
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Nakano T. Tricks of Light on Helices: Transformation of Helical Polymers by Photoirradiation. CHEM REC 2014; 14:369-85. [DOI: 10.1002/tcr.201300042] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Tamaki Nakano
- Catalysis Research Center; Hokkaido University; Sapporo 001-0021 Japan
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19
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Ruíz A, Morera-Boado C, Almagro L, Coro J, Maroto EE, Herranz MÁ, Filippone S, Molero D, Martínez-Álvarez R, Garcia de la Vega JM, Suárez M, Martín N. Dumbbell-Type Fullerene-Steroid Hybrids: A Join Experimental and Theoretical Investigation for Conformational, Configurational, and Circular Dichroism Assignments. J Org Chem 2014; 79:3473-86. [DOI: 10.1021/jo500178t] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
| | | | | | | | | | | | | | | | | | - José M. Garcia de la Vega
- Departamento de
Química Física Aplicada, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049-Madrid, Spain
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20
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Si Y, Yang G. Nonplanar Donor–Acceptor Chiral Molecules with Large Second-Order Optical Nonlinearities: 1,1,4,4-Tetracyanobuta-1,3-diene Derivatives. J Phys Chem A 2014; 118:1094-102. [PMID: 24467250 DOI: 10.1021/jp4099717] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yanling Si
- College
of Resource and Environmental Science, Jilin Agricultural University, Changchun, 130118 Jilin, China
| | - Guochun Yang
- Institute
of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 Jilin, China
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21
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Jastrzebska B. GPCR: G protein complexes--the fundamental signaling assembly. Amino Acids 2013; 45:1303-14. [PMID: 24052187 DOI: 10.1007/s00726-013-1593-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 09/10/2013] [Indexed: 12/15/2022]
Abstract
G protein coupled receptors (GPCR) constitute the largest group of cell surface receptors that transmit various signals across biological membranes through the binding and activation of heterotrimeric G proteins, which amplify the signal and activate downstream effectors leading to the biological responses. Thus, the first critical step in this signaling cascade is the interaction between receptor and its cognate G protein. Understanding this critical event at the molecular level is of high importance because abnormal function of GPCRs is associated with many diseases. Thus, these receptors are targets for drug development.
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Affiliation(s)
- Beata Jastrzebska
- Department of Pharmacology, School of Medicine, Case Western Reserve University, 10900 Euclid Ave, Cleveland, OH, 44106-4965, USA,
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22
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Pietropaolo A, Nakano T. Molecular mechanism of polyacrylate helix sense switching across its free energy landscape. J Am Chem Soc 2013; 135:5509-12. [PMID: 23551335 DOI: 10.1021/ja4002508] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Helical polymers with switchable screw sense are versatile frameworks for chiral functional materials. In this work, we reconstructed the free energy landscape of helical poly(2,7-bis(4-tert-butylphenyl)fluoren-9-yl acrylate) [poly(BBPFA)], as its racemization is selectively driven by light without any rearrangement of chemical bonds. The chirality inversion was enforced by atomistic free energy simulations using chirality indices as reaction coordinates. The free energy landscape reproduced the experimental electronic circular dichroism spectra. We propose that the chirality inversion of poly(BBPFA) proceeds from a left-handed 31 helix via multistate free energy pathways to reach the right-handed 31 helix. The inversion is triggered by the rotation of biphenyl units with an activation barrier of 38 kcal/mol. To the best of our knowledge, this is the first report on the chiral inversion mechanism of a helical polymer determined in a quantitative way in the framework of atomistic free energy simulations.
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Affiliation(s)
- Adriana Pietropaolo
- Dipartimento di Scienze della Salute, Università di Catanzaro, Viale Europa, 88100 Catanzaro, Italy.
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23
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Si Y, Yang G. Theoretical study on the photophysical properties of chiral mononuclear and dinuclear zinc complexes. RSC Adv 2013. [DOI: 10.1039/c2ra23116f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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24
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Yang G, Si Y, Su Z. Chiroptical, linear, and second-order nonlinear optical properties of binaphthol derivatives. Org Biomol Chem 2012; 10:8418-25. [PMID: 23032517 DOI: 10.1039/c2ob26374b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have investigated the chiroptical, linear, and second-order nonlinear optical (NLO) properties of seven binaphthol derivatives and elucidated structure-property relationships from the micromechanism for the first time. The excitation energies, oscillator strengths, and rotational strengths of the 150 lowest energy electron excitations for the most stable conformers have been calculated at TDB3LYP/cc-pVDZ level of theory. The experimental UV-vis absorption energies were reproduced well by our calculations. The simulated circular dichroism (CD) spectra and calculated optical rotation (OR) values are in reasonable agreement with experimental ones. These results demonstrate that TDDFT calculations can not only describe the electron transition property but also can be used to assign the absolute configurations (ACs) of binaphthol derivatives with high confidence. Whereas OR values are more sensitive to the molecular structures than CD spectra. The electron transition property and chiroptical origin have been assigned and analyzed. These derivatives possess remarkably large molecular first hyperpolarizabilities, especially compound 7 which has a value of 241.65 × 10(-30) esu. This value is about 60 times as large as that of highly π-delocalized phenyliminomethyl ferrocene complex. Moreover, compound 6 exhibits pronounced different second-order NLO response values from neutral state to the two cationic states (6(2+) and 6(4+)), which indicates that this compound could act as a potential NLO switch material. The cooperativity of intramolecular charge transfer of the studied compounds was also discussed.
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Affiliation(s)
- Guochun Yang
- Institute of Functional Material Chemistry, Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024, China.
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25
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LI YUANZUO, SONG PENG, SHI YING, DING YONG, ZHOU FENGJIE, ZHAO MEIYU, CHEN MAODU. STUDY OF THE S1 AND S2 EXCITED STATES OF GAS-PHASE PROTONATED SCHIFF BASE RETINAL CHROMOPHORES IN ONE AND TWO PHOTON ABSORPTION. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2012. [DOI: 10.1142/s0219633611006372] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The S1 and S2 excited states of gas-phase protonated Schiff base retinal chromophores in the one- and two-photon absorptions (TPAs) are investigated with time-dependent density functional theory. In one-photon absorption, the two-dimensional (2D) site and three-dimensional (3D) cube representations reveal that S1 and S2 excited states of gas-phase protonated Schiff base retinal chromophores are all charge transfer excited states. To better study the weak S2 excited states of gas-phase protonated Schiff base retinal chromophores, we investigated theoretically excited state properties of them in TPA. For 11-cis dimethyl retinal, it is found that the cross section of S2 excited state is 51.04 GM in PTA, which is only slightly smaller than that of S1 (77.04 GM) in TPA. Therefore, the S2 excited state of 11-cis dimethyl retinal can be clearly observed in TPA experiment. The 2D site and 3D cube representations reveal that electronic transition from S1 to S2 excited state of gas-phase protonated Schiff base retinal chromophores in TPA are also of charge transfer character.
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Affiliation(s)
- YUANZUO LI
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China
- School of Physics and Material Engineering, and School of Science, Dalian Nationalities University, Dalian, 116600, P. R. China
| | - PENG SONG
- Department of Physics, Liaoning University, Shenyang, 110036, P. R. China
| | - YING SHI
- Institute of Atomic and Molecular Physics, Jilin University, Changchun, P. R. China
| | - YONG DING
- Department of Physics, Liaoning University, Shenyang, 110036, P. R. China
| | - FENGJIE ZHOU
- Department of Physics, Liaoning University, Shenyang, 110036, P. R. China
| | - MEIYU ZHAO
- Department of Chemistry, University of Alberta, Edmonton, AB, T6G 2G2, Canada
| | - MAODU CHEN
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China
- School of Physics and Material Engineering, and School of Science, Dalian Nationalities University, Dalian, 116600, P. R. China
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26
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Pescitelli G, Woody RW. The Exciton Origin of the Visible Circular Dichroism Spectrum of Bacteriorhodopsin. J Phys Chem B 2012; 116:6751-63. [DOI: 10.1021/jp212166k] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gennaro Pescitelli
- Dipartimento
di Chimica e Chimica
Industriale, Università degli Studi di Pisa, via Risorgimento 35, I-56126 Pisa, Italy
| | - Robert W. Woody
- Department of Biochemistry and
Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, United States
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27
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Yang G, Si Y, Su Z. Theoretical Study on the Chiroptical Optical Properties of Chiral Fullerene C60 Derivative. J Phys Chem A 2011; 115:13356-63. [DOI: 10.1021/jp204860x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Guochun Yang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 Jilin, China
| | - Yanling Si
- College of Resource and Environmental Science Jilin Agricultural University, Changchun, 130118 Jilin, China
| | - Zhongmin Su
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 Jilin, China
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28
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Evidence from Chlamydomonas on the photoactivation of rhodopsins without isomerization of their chromophore. ACTA ACUST UNITED AC 2011; 18:733-42. [PMID: 21700209 DOI: 10.1016/j.chembiol.2011.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 03/12/2011] [Accepted: 04/04/2011] [Indexed: 12/16/2022]
Abstract
Attachment of retinal to opsin forms the chromophore N-retinylidene, which isomerizes during photoactivation of rhodopsins. To test whether isomerization is crucial, custom-tailored chromophores lacking the β-ionone ring and any isomerizable bonds were incorporated in vivo into the opsin of a blind mutant of the eukaryote Chlamydomonas reinhardtii. The analogs restored phototaxis with the anticipated action spectra, ruling out the need for isomerization in photoactivation. To further elucidate photoactivation, responses to chromophores formed from naphthalene aldehydes were studied. The resulting action spectral shifts suggest that charge separation within the excited chromophore leads to electric field-induced polarization of nearby amino acid residues and altered hydrogen bonding. This redistribution of charge facilitates the reported multiple bond rotations and protein rearrangements of rhodopsin activation. These results provide insight into the activation of rhodopsins and related GPCRs.
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29
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Si Y, Yang G, Hu M, Wang M. Assignment of the absolute configuration of dinuclear zirconium complexes containing two homochiral N atoms using TDDFT calculations of ECD. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2010.12.041] [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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30
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Abstract
The implementation of multiconfigurational quantum chemistry methods into a quantum-mechanics/molecular-mechanics protocol has allowed the construction of a realistic computer model for the sensory rhodopsin of the cyanobacterium Anabaena PCC 7120. The model, which reproduces the absorption spectra of both the all-trans and 13-cis forms of the protein and their associated K and L intermediates, is employed to investigate the light-driven steps of the photochromic cycle exhibited by the protein. It is found that the photoisomerizations of the all-trans and 13-cis retinal chromophores occur through unidirectional, counterclockwise 180° rotations of the =C14-C15= moiety with respect to the Lys210-linked end of the chromophore axis. Thus, the sequential interconversions of the all-trans and 13-cis forms during a single photochromic cycle yield a complete (360°) unidirectional rotation of the =C14-C15= moiety. This finding implies that Anabaena sensory rhodopsin is a biological realization of a light-driven molecular rotor.
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31
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Abstract
This tutorial review covers the recent development in the synthesis and application of molecules and finite assemblies that are chiral owing to their curvature. A modified definition of inherent chirality is provided. Various classes of chiral concave molecules are presented including salphen complexes, cyclic amides, derivatives of sumanene, trioxatricornan or subphthalocyanine, cyclotriveratrylenes, homooxacalix[3]arenes, calixarenes, resorcinarenes, phthalocyanines, corannulenes and cavitands. Some of these bowl shaped compounds exhibit high inversion barriers, comparable with the stability of classical carbon chirality centres, while the others (e.g. hydrogen bonded assemblies) can only be detected by NMR. This review is focused on practical aspects of synthesis, resolution and applications in chiral recognition and asymmetric synthesis.
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Affiliation(s)
- Agnieszka Szumna
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland.
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32
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Pescitelli G, Kurtán T, Flörke U, Krohn K. Absolute structural elucidation of natural products--a focus on quantum-mechanical calculations of solid-state CD spectra. Chirality 2010; 21 Suppl 1:E181-201. [PMID: 19902530 DOI: 10.1002/chir.20795] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this review article we examine state-of-the-art techniques for the structural elucidation of organic compounds isolated from natural sources. In particular, we focus on the determination of absolute configuration (AC), perhaps the most challenging but inevitable step in the whole process, especially when newly isolated compounds are screened for biological activity. Among the many methods employed for AC assignment that we review, special attention is paid to electronic circular dichroism (CD) and to the modern tools available for quantum-mechanics CD predictions, including TDDFT. In this context, we stress that conformational flexibility often poses a limit to practical CD calculations of solution CD spectra. Many crystalline natural products suitable for X-ray analysis do not contain heavy atoms for a confidential AC assignment by resonant scattering. However, their CD spectra can be recorded in the solid state, for example with the KCl pellet technique, and analyzed possibly by nonempirical means to provide stereochemical information. In particular, solid-state CD spectra can be compared with those calculated with TDDFT or other high-level methods, using the X-ray geometry as input. The solid-state CD/TDDFT approach, described in detail, represents a quick and reliable tool for AC assignment of natural products.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, Pisa, Italy.
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33
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Iyama T, Kawabata H, Tachikawa H. Effects of Point Charges on the Excitation Energies of Protonated Schiff Base of Retinal. ACTA ACUST UNITED AC 2010. [DOI: 10.1080/15533174.2010.486814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Tetsuji Iyama
- a Division of Materials Chemistry, Graduate School of Engineering , Hokkaido University , Sapporo, Japan
| | - Hiroshi Kawabata
- a Division of Materials Chemistry, Graduate School of Engineering , Hokkaido University , Sapporo, Japan
| | - Hiroto Tachikawa
- a Division of Materials Chemistry, Graduate School of Engineering , Hokkaido University , Sapporo, Japan
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34
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Thomas YG, Szundi I, Lewis JW, Kliger DS. Microsecond time-resolved circular dichroism of rhodopsin photointermediates. Biochemistry 2010; 48:12283-9. [PMID: 19905009 DOI: 10.1021/bi901657b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Time-resolved circular dichroism measurements, over a spectral range from 300 to 700 nm, were made at delays of 5, 100, and 500 micros after room-temperature photoexcitation of bovine rhodopsin in a lauryl maltoside suspension. The purpose was to provide more structural information about intermediate states in the activation of rhodopsin and other G protein-coupled receptors. In particular, information was sought about photointermediates that are isochromic or nearly isochromic in their unpolarized absorbance. The circular dichroism spectrum of lumirhodopsin, obtained after correcting the 5 micros difference CD data for the bleached rhodopsin, was in reasonable agreement with the lumirhodopsin CD spectrum obtained previously by thermal trapping at -76 degrees C. Similarly, the metarhodopsin II spectrum obtained with a 500 micros delay was also in agreement with the results of previous work on the temperature-trapped form of metarhodopsin II. However, the CD of the mixture formed with a 100 micros delay after photoexcitation, whose only visible absorbing component is lumirhodopsin, could not be accounted for near 480 nm in terms of the initially formed, 5 micros lumirhodopsin CD spectrum. Thus, the CD spectrum of lumirhodopsin changes on the time scale from 5 to 100 micros, showing reduced rotational strength in its visible band, possibly associated with either a process responsible for a small spectral shift that occurs in the lumirhodopsin absorbance spectrum at earlier times or the Schiff base deprotonation-reprotonation which occurs during equilibration of lumirhodopsin with the Meta I(380) photointermediate. Either explanation suggests a chromophore conformation change closely associated with deprotonation which could be the earliest direct trigger of activation.
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Affiliation(s)
- Yiren Gu Thomas
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA
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35
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Autschbach J, Nitsch-Velasquez L, Rudolph M. Time-dependent density functional response theory for electronic chiroptical properties of chiral molecules. Top Curr Chem (Cham) 2010; 298:1-98. [PMID: 21321799 DOI: 10.1007/128_2010_72] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Methodology to calculate electronic chiroptical properties from time-dependent density functional theory (TDDFT) is outlined. Applications of TDDFT to computations of electronic circular dichroism, optical rotation, and optical rotatory dispersion are reviewed. Emphasis is put on publications from 2005 to 2010, but much of the older literature is also cited and discussed. The determination of the absolute configuration of chiral molecules by combined measurements and computations is an important application of TDDFT chiroptical methods and discussed in some detail. Raman optical activity (ROA) spectra are obtained from normal-mode derivatives of the optical rotation tensor and other linear response tensors. A few selected (ROA) benchmarks are reviewed.
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Affiliation(s)
- Jochen Autschbach
- Department of Chemistry, University at Buffalo State University of New York, New York, NY, USA.
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36
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Send R, Sundholm D, Johansson MP, Pawłowski F. Excited State Potential Energy Surfaces of Polyenes and Protonated Schiff Bases. J Chem Theory Comput 2009; 5:2401-14. [DOI: 10.1021/ct900240s] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert Send
- Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany
| | - Dage Sundholm
- Department of Chemistry, P.O. Box 55 (A.I. Virtanens plats 1), University of Helsinki, FI-00014 Helsinki, Finland
| | - Mikael P. Johansson
- Lundbeck Foundation Centre for Theoretical Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Århus C, Denmark
| | - Filip Pawłowski
- Physics Institute, Kazimierz Wielki University, Plac Weyssenhoffa 11, PL-85-072 Bydgoszcz, Poland
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37
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Kock I, Draeger S, Schulz B, Elsässer B, Kurtán T, Kenéz Á, Antus S, Pescitelli G, Salvadori P, Speakman JB, Rheinheimer J, Krohn K. Pseudoanguillosporin A and B: Two New Isochromans Isolated from the Endophytic FungusPseudoanguillosporasp. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801083] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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38
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Hussain H, Akhtar N, Draeger S, Schulz B, Pescitelli G, Salvadori P, Antus S, Kurtán T, Krohn K. New Bioactive 2,3-Epoxycyclohexenes and Isocoumarins from the Endophytic FungusPhomopsissp. fromLaurus Azorica. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801052] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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39
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Nielsen MB. Model systems for understanding absorption tuning by opsin proteins. Chem Soc Rev 2009; 38:913-24. [DOI: 10.1039/b802068j] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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