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Komatsu Y, Takizawa K. A quantum chemical study on the effects of varying the central metal in extended photosynthetic pigments. Phys Chem Chem Phys 2021; 23:14404-14414. [PMID: 34180470 DOI: 10.1039/d1cp00760b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In a certain period of Earth's history, chlorophylls with Mg as their central metal would have been selected as the major photosynthetic pigments, reflecting the radiation in habitats. Assuming evolution in different light and material environments, different photosynthetic pigments would occur. This study is the first attempt to evaluate the physical and chemical properties of model photosynthetic pigments and their potential to function in a variety of light environments using quantum chemistry calculations. Specifically, bacteriochlorophyll b (Bchl b), phthalocyanine (Pht) and meso-dibenzoporphycene (mDBPc) were selected as template molecules, while Be, Mg, Ca, Ni, Zn, Sr, Pd, Cd, Ba, Pt, Hg, Pb and H2 were examined as the central metals in each molecule in various solvents. The results showed that the light absorption by each of these compounds varied over a range of 100 nm depending on the central metal and the surrounding solvent, and Pb produced the largest red shift in the absorption bands of all three photosynthetic pigments. The Pht molecules showed similar redox properties to the chlorophylls, suggesting that these derivatives could be substituted for the special pairs in reaction centers, while the mDBPc molecules appear to be more suitable as accessory pigments due to their extraordinarily broad absorption ranges of approximately 500 nm depending on the conditions.
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Affiliation(s)
- Yu Komatsu
- AstroBiology Center, Osawa 2-21-1, Mitaka, Tokyo, Japan. and National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo, Japan
| | - Kenji Takizawa
- AstroBiology Center, Osawa 2-21-1, Mitaka, Tokyo, Japan. and National Institute for Basic Biology, Nishigonaka 38, Myodaiji, Okazaki, Aichi, Japan
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2
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Tuning the Photophysical Features of Self-Assembling Photoactive Polypeptides for Light-Harvesting. MATERIALS 2019; 12:ma12213554. [PMID: 31671513 PMCID: PMC6862114 DOI: 10.3390/ma12213554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 10/25/2019] [Accepted: 10/27/2019] [Indexed: 01/03/2023]
Abstract
The LH1 complex is the major light-harvesting antenna of purple photosynthetic bacteria. Its role is to capture photons, and then store them and transfer the excitation energy to the photosynthetic reaction center. The structure of LH1 is modular and it cooperatively self-assembles from the subunits composed of short transmembrane polypeptides that reversibly bind the photoactive cofactors: bacteriochlorophyll and carotenoid. LH1 assembly, the intra-complex interactions and the light-harvesting features of LH1 can be controlled in micellar media by varying the surfactant concentration and by adding carotenoid and/or a co-solvent. By exploiting this approach, we can manipulate the size of the assembly, the intensity of light absorption, and the energy and lifetime of its first excited singlet state. For instance, via the introduction of Ni-substituted bacteriochlorophyll into LH1, the lifetime of this electronic state of the antenna can be shortened by almost three orders of magnitude. On the other hand, via the exchange of carotenoid, light absorption in the visible range can be tuned. These results show how in a relatively simple self-assembling pigment-polypeptide system a sophisticated functional tuning can be achieved and thus they provide guidelines for the construction of bio-inspired photoactive nanodevices.
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3
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Kotkowiak M, Dudkowiak A, Fiedor L. Intrinsic Photoprotective Mechanisms in Chlorophylls. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705357] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Michał Kotkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Alina Dudkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Leszek Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology; Jagiellonian University; Gronostajowa 7 30-387 Krakow Poland
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4
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Kotkowiak M, Dudkowiak A, Fiedor L. Intrinsic Photoprotective Mechanisms in Chlorophylls. Angew Chem Int Ed Engl 2017; 56:10457-10461. [DOI: 10.1002/anie.201705357] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Michał Kotkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Alina Dudkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Leszek Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology; Jagiellonian University; Gronostajowa 7 30-387 Krakow Poland
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Orzeł Ł, Waś J, Kania A, Susz A, Rutkowska-Zbik D, Staroń J, Witko M, Stochel G, Fiedor L. Factors controlling the reactivity of divalent metal ions towards pheophytin a. J Biol Inorg Chem 2017. [PMID: 28639057 PMCID: PMC5517585 DOI: 10.1007/s00775-017-1472-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In this study, we evaluate the factors which determine the reactivity of divalent metal ions in the spontaneous formation of metallochlorophylls, using experimental and computational approaches. Kinetic studies were carried out using pheophytin a in reactions with various divalent metal ions combined with non- or weakly-coordinative counter ions in a series of organic solvents. To obtain detailed insights into the solvent effect, the metalations with the whole set of cations were investigated in three solvents and with Zn2+ in seven solvents. The reactions were monitored using electronic absorption spectroscopy and the stopped-flow technique. DFT calculations were employed to shed light on the role of solvent in activating the metal ions towards porphyrinoids. This experimental and computational analysis gives detailed information regarding how the solvent and the counter ion assist/hinder the metalation reaction as activators/inhibitors. The metalation course is dictated to a large extent by the reaction medium, via either the activation or deactivation of the incoming metal ion. The solvent may affect the metalation in several ways, mainly via H-bonding with pyrrolenine nitrogens and the activation/deactivation of the incoming cation. It also seems to affect the activation enthalpy by causing slight conformational changes in the macrocyclic ligand. These new mechanistic insights contribute to a better understanding of the “metal–counterion–solvent” interplay in the metalation of porphyrinoids. In addition, they are highly relevant to the mechanisms of metalation reactions catalyzed by chelatases and explain the differences between the insertion of Mg2+ and other divalent cations.
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Affiliation(s)
- Ł Orzeł
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland.
| | - J Waś
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
| | - A Kania
- Institute of Biology, Pedagogical University of Cracow, Podchorążych 2, 30-084, Kraków, Poland
| | - A Susz
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
| | - D Rutkowska-Zbik
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Kraków, Poland
| | - J Staroń
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
- Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343, Kraków, Poland
| | - M Witko
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Kraków, Poland
| | - G Stochel
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland
| | - L Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland.
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Fiedor L, Fiedor J, Pilch M. Effects of Molecular Symmetry on the Electronic Transitions in Carotenoids. J Phys Chem Lett 2016; 7:1821-9. [PMID: 27138647 DOI: 10.1021/acs.jpclett.6b00637] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The aim of this work is the verification of symmetry effects on the electronic absorption spectra of carotenoids. The symmetry breaking in cis-β-carotenes and in carotenoids with nonlinear π-electron system is of virtually no effect on the dark transitions in these pigments, in spite of the loss of the inversion center and evident changes in their electronic structure. In the cis isomers, the S2 state couples with the higher excited states and the extent of this coupling depends on the position of the cis bend. A confrontation of symmetry properties of carotenoids with their electronic absorption and IR and Raman spectra shows that they belong to the C1 or C2 but not the C2h symmetry group, as commonly assumed. In these realistic symmetries all the electronic transitions are symmetry-allowed and the absence of some transitions, such as the dark S0 → S1 transition, must have another physical origin. Most likely it is a severe deformation of the carotenoid molecule in the S1 state, unachievable directly from the ground state, which means that the Franck-Condon factors for a vertical S0 → S1 transition are negligible because the final state is massively displaced along the vibrational coordinates. The implications of our findings have an impact on the understanding of the photophysics and functioning of carotenoids.
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Affiliation(s)
- Leszek Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University , Gronostajowa 7, 30-387 Kraków, Poland
| | - Joanna Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University , Gronostajowa 7, 30-387 Kraków, Poland
- Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology , Mickiewicza 30, 30-059 Kraków, Poland
| | - Mariusz Pilch
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University , Gronostajowa 7, 30-387 Kraków, Poland
- Faculty of Chemistry, Jagiellonian University , Ingardena 3, 30-060 Kraków, Poland
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Bursa B, Wróbel D, Barszcz B, Kotkowiak M, Vakuliuk O, Gryko DT, Kolanowski Ł, Baraniak M, Lota G. The impact of solvents on the singlet and triplet states of selected fluorine corroles – absorption, fluorescence, and optoacoustic studies. Phys Chem Chem Phys 2016; 18:7216-28. [DOI: 10.1039/c5cp06335c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This paper examines the influence of aprotic solvents on the spectroscopic properties as well as the energy deactivation of two free-base corrole dyes substituted with C6F5 and/or 4-NO2C6H4 groups.
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Affiliation(s)
- Bartosz Bursa
- Faculty of Technical Physics
- Institute of Physics
- Poznan University of Technology
- 60-965 Poznan
- Poland
| | - Danuta Wróbel
- Faculty of Technical Physics
- Institute of Physics
- Poznan University of Technology
- 60-965 Poznan
- Poland
| | - Bolesław Barszcz
- Faculty of Technical Physics
- Institute of Physics
- Poznan University of Technology
- 60-965 Poznan
- Poland
| | - Michał Kotkowiak
- Faculty of Technical Physics
- Institute of Physics
- Poznan University of Technology
- 60-965 Poznan
- Poland
| | - Olena Vakuliuk
- Institute of Organic Chemistry
- Polish Academy of Sciences
- 01-224 Warsaw
- Poland
| | - Daniel T. Gryko
- Institute of Organic Chemistry
- Polish Academy of Sciences
- 01-224 Warsaw
- Poland
| | - Łukasz Kolanowski
- Institute of Chemistry and Technical Electrochemistry
- Poznan University of Technology
- 60-965 Poznan
- Poland
| | - Marek Baraniak
- Institute of Chemistry and Technical Electrochemistry
- Poznan University of Technology
- 60-965 Poznan
- Poland
| | - Grzegorz Lota
- Institute of Chemistry and Technical Electrochemistry
- Poznan University of Technology
- 60-965 Poznan
- Poland
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Calogero G, Bartolotta A, Di Marco G, Di Carlo A, Bonaccorso F. Vegetable-based dye-sensitized solar cells. Chem Soc Rev 2015; 44:3244-94. [DOI: 10.1039/c4cs00309h] [Citation(s) in RCA: 254] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this review we provide an overview of vegetable pigments in dye-sensitized solar cells, starting from main limitations of cell performance to cost analysis and scaling-up prospects.
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Affiliation(s)
| | | | - Gaetano Di Marco
- CNR-IPCF
- Istituto per i Processi Chimico-Fisici
- 98158 Messina
- Italy
| | - Aldo Di Carlo
- CHOSE – Centre for Hybrid and Organic Solar Energy – University of Rome “Tor Vergata”
- 00133 Roma
- Italy
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Lessons from chlorophylls: modifications of porphyrinoids towards optimized solar energy conversion. Molecules 2014; 19:15938-54. [PMID: 25286377 PMCID: PMC6271569 DOI: 10.3390/molecules191015938] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 08/20/2014] [Accepted: 09/05/2014] [Indexed: 11/16/2022] Open
Abstract
Practical applications of photosynthesis-inspired processes depend on a thorough understanding of the structures and physiochemical features of pigment molecules such as chlorophylls and bacteriochlorophylls. Consequently, the major structural features of these pigments have been systematically examined as to how they influence the S1 state energy, lifetimes, quantum yields, and pigment photostability. In particular, the effects of the macrocyclic π-electron system, central metal ion (CMI), peripheral substituents, and pigment aggregation, on these critical parameters are discussed. The results obtained confirm that the π-electron system of the chromophore has the greatest influence on the light energy conversion capacity of porphyrinoids. Its modifications lead to changes in molecular symmetry, which determine the energy levels of frontier orbitals and hence affect the S1 state properties. In the case of bacteriochlorophylls aggregation can also strongly decrease the S1 energy. The CMI may be considered as another influential structural feature which only moderately influences the ground-state properties of bacteriochlorophylls but strongly affects the singlet excited-state. An introduction of CMIs heavier than Mg2+ significantly improves pigments' photostabilities, however, at the expense of S1 state lifetime. Modifications of the peripheral substituents may also influence the S1 energy, and pigments’ redox potentials, which in turn influence their photostability.
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Kania A, Pilch M, Rutkowska-Zbik D, Susz A, Heriyanto, Stochel G, Fiedor L. High-pressure and theoretical studies reveal significant differences in the electronic structure and bonding of magnesium, zinc, and nickel ions in metalloporphyrinoids. Inorg Chem 2014; 53:8473-84. [PMID: 25072655 DOI: 10.1021/ic501029b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High pressure in combination with optical spectroscopy was used to gain insights into the interactions between Mg(2+), Zn(2+), and Ni(2+) ions and macrocyclic ligands of porphyrinoid type. In parallel, the central metal ion-macrocycle bonding was investigated using theoretical approaches. The symmetry properties of the orbitals participating in this bonding were analyzed, and pigment geometries and pressure/ligation effects were computed within DFT. Bacteriopheophytin a was applied as both a model chelator and a highly specific spectroscopic probe. The analysis of solvent and pressure effects on the spectral properties of the model Mg(2+), Zn(2+), and Ni(2+) complexes with bacteriopheophytin a shows that various chemical bonds are formed in the central pocket, depending on the valence configuration of the central metal ion. In addition, the character of this bonding depends on symmetry of the macrocyclic system. Since in most cases it is not coordinative bonding, these results challenge the conventional view of metal ion bonding in such complexes. In (labile) complexes with the main group metals, the metal ion-macrocycle interaction is mostly electrostatic. Significantly, water molecules are not preferred as a second axial ligand in such complexes, mainly due to the entropic constraints. The metal ions with a closed d shell may form (stable) complexes with the macrocycle via classical coordination bonds, engaging their p and s orbitals. Transition metals, due to the unfilled d shell, do form much more stable complexes, because of strong bonding via both coordination and covalent interactions. These conclusions are confirmed by DFT computations and theoretical considerations, which altogether provide the basis to propose a consistent and general mechanism of how the central metal ion and its interactions with the core nitrogens govern the physicochemical properties of metalloporphyrinoids.
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Affiliation(s)
- Agnieszka Kania
- Faculty of Chemistry, Jagiellonian University , ul. Ingardena 3, 30-060 Kraków, Poland
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Lambrev PH, Miloslavina Y, van Stokkum IHM, Stahl AD, Michalik M, Susz A, Tworzydło J, Fiedor J, Huhn G, Groot ML, van Grondelle R, Garab G, Fiedor L. Excitation energy trapping and dissipation by Ni-substituted bacteriochlorophyll a in reconstituted LH1 complexes from Rhodospirillum rubrum. J Phys Chem B 2013; 117:11260-71. [PMID: 23837465 DOI: 10.1021/jp4020977] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bacteriochlorophyll a with Ni(2+) replacing the central Mg(2+) ion was used as an ultrafast excitation energy dissipation center in reconstituted bacterial LH1 complexes. B870, a carotenoid-less LH1 complex, and B880, an LH1 complex containing spheroidene, were obtained via reconstitution from the subunits isolated from chromatophores of Rhodospirillum rubrum . Ni-substituted bacteriochlorophyll a added to the reconstitution mixture partially substituted the native pigment in both forms of LH1. The excited-state dynamics of the reconstituted LH1 complexes were probed by femtosecond pump-probe transient absorption spectroscopy in the visible and near-infrared spectral region. Spheroidene-binding B880 containing no excitation dissipation centers displayed complex dynamics in the time range of 0.1-10 ps, reflecting internal conversion and intersystem crossing in the carotenoid, exciton relaxation in BChl complement, and energy transfer from carotenoid to the latter. In B870, some aggregation-induced excitation energy quenching was present. The binding of Ni-BChl a to both B870 and B880 resulted in strong quenching of the excited states with main deexcitation lifetime of ca. 2 ps. The LH1 excited-state lifetime could be modeled with an intrinsic decay time constant in Ni-substituted bacteriochlorophyll a of 160 fs. The presence of carotenoid in LH1 did not influence the kinetics of energy trapping by Ni-BChl unless the carotenoid was directly excited, in which case the kinetics was limited by a slower carotenoid S1 to bacteriochlorophyll energy transfer.
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Affiliation(s)
- Petar H Lambrev
- Biological Research Centre, Hungarian Academy of Sciences , Temesvári krt. 62, 6726 Szeged, Hungary
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