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Light-Harvesting Complexes
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Light-Harvesting Complexes

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Computational and Theoretical Chemistry".

Deadline for manuscript submissions: closed (30 April 2015) | Viewed by 24198

Special Issue Editor

Prof. Dr. Pall Thordarson

E-Mail Website
Guest Editor
School of Chemistry, The University of New South Wales, NSW 2052, Australia
Interests: nanomedicine (self-assembled gels for drug release, cancer cell targeting peptides, gels as 3D cell culture mimicking, AFM as a tool in drug discovery); biophysical and protein chemistry (light-activiated bioconjugates, proteins and polymer self-assembly, controlling protein self-assembly); supramolecular chemistry (supramolecular chemistry of peptides and proteins in water, non-linear interactons in supramolecular chemistry, the formation of self-assembled gels, bio-mimetic light-harvesting and donor-acceptor arrays, binding constants and statistical treatment of supramolecular binding data)

Special Issue Information

Dear Colleagues,

Light-harvesting, the capture, storage and concentration of photon energy, is the first step in photosynthesis as light energy is converted to chemical energy. This incredibly efficient process is carried out by a fascinating array of proteins and chromophores in nature. The structural and photophysical properties of these systems provide a rich source of important challenges for chemistry researchers. The synthesis of artificial light-harvesting complexes is of particular note in this context because synthetic bio-mimetic light-harvesting complexes have and will continue to help us understand how their natural counterparts work. Additionally, synthetic light-harvesting complexes could be used to form novel solar concentrators to enhance the cost-efficiency of current and future generations of solar cells and other photovoltaic devices. The special issue invites submission in any area related to light-harvesting complexes, ranging from, but not limited to, biophysical and photophysical investigations into light-harvesting in nature to reports on synthetic organic and inorganic light-harvesting complexes in one-, two- or three-dimensions formed by covalent or non-covalent chemistry.

Prof. Pall Thordarson
Guest Editor

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Keywords

  • light-harvesting
  • biomimetics
  • chromophores
  • energy transfer
  • donor-acceptor systems

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Published Papers (3 papers)

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Research

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20 pages, 3111 KiB  
Article
Synthesis and Photoluminescent Properties of Geometrically Hindered cis-Tris(diphenylaminofluorene) as Precursors to Light-Emitting Devices
by Nam-Goo Kang, Ken Kokubo, Seaho Jeon, Min Wang, Chang-Lyoul Lee, Taizoon Canteenwala, Loon-Seng Tan and Long Y. Chiang
Molecules 2015, 20(3), 4635-4654; https://doi.org/10.3390/molecules20034635 - 13 Mar 2015
Cited by 7 | Viewed by 6631
Abstract
A novel highly luminescent tris-fluorenyl ring-interconnected chromophore tris(DPAF-C9) was synthesized using a C3 symmetrical triaminobenzene core as the synthon. This structure bears three light-harvesting 2-diphenylamino-9,9-dialkylfluorenyl (DPAF) ring moieties with each attached by two branched 3',5',5'-trimethylhexyl (C9) arms. A [...] Read more.
A novel highly luminescent tris-fluorenyl ring-interconnected chromophore tris(DPAF-C9) was synthesized using a C3 symmetrical triaminobenzene core as the synthon. This structure bears three light-harvesting 2-diphenylamino-9,9-dialkylfluorenyl (DPAF) ring moieties with each attached by two branched 3',5',5'-trimethylhexyl (C9) arms. A major stereoisomer was chromatographically isolated and characterized to possess a 3D structural configuration of cis-conformer in a cup-form. Molecular calculation at B3LYP/6-31G* level revealed the unexpected stability of this cis-cup-conformer of tris(DPAF-C9) better than that of the stereoisomer in a propeller-form and the trans-conformer. The structural geometry is proposed to be capable of minimizing the aggregation related self-quenching effect in the condensed phase. Fluorescence emission wavelength of tris(DPAF-C9) was found to be in a close range to that of PVK that led to its potential uses as the secondary blue hole-transporting material for enhancing the device property toward the modulation of PLED performance. Full article
(This article belongs to the Special Issue Light-Harvesting Complexes)
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Review

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49 pages, 4102 KiB  
Review
Optimal Energy Transfer in Light-Harvesting Systems
by Lipeng Chen, Prathamesh Shenai, Fulu Zheng, Alejandro Somoza and Yang Zhao
Molecules 2015, 20(8), 15224-15272; https://doi.org/10.3390/molecules200815224 - 20 Aug 2015
Cited by 41 | Viewed by 10768
Abstract
Photosynthesis is one of the most essential biological processes in which specialized pigment-protein complexes absorb solar photons, and with a remarkably high efficiency, guide the photo-induced excitation energy toward the reaction center to subsequently trigger its conversion to chemical energy. In this work, [...] Read more.
Photosynthesis is one of the most essential biological processes in which specialized pigment-protein complexes absorb solar photons, and with a remarkably high efficiency, guide the photo-induced excitation energy toward the reaction center to subsequently trigger its conversion to chemical energy. In this work, we review the principles of optimal energy transfer in various natural and artificial light harvesting systems. We begin by presenting the guiding principles for optimizing the energy transfer efficiency in systems connected to dissipative environments, with particular attention paid to the potential role of quantum coherence in light harvesting systems. We will comment briefly on photo-protective mechanisms in natural systems that ensure optimal functionality under varying ambient conditions. For completeness, we will also present an overview of the charge separation and electron transfer pathways in reaction centers. Finally, recent theoretical and experimental progress on excitation energy transfer, charge separation, and charge transport in artificial light harvesting systems is delineated, with organic solar cells taken as prime examples. Full article
(This article belongs to the Special Issue Light-Harvesting Complexes)
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21 pages, 1659 KiB  
Review
Light-Induced Infrared Difference Spectroscopy in the Investigation of Light Harvesting Complexes
by Alberto Mezzetti
Molecules 2015, 20(7), 12229-12249; https://doi.org/10.3390/molecules200712229 - 3 Jul 2015
Cited by 11 | Viewed by 6026
Abstract
Light-induced infrared difference spectroscopy (IR-DS) has been used, especially in the last decade, to investigate early photophysics, energy transfer and photoprotection mechanisms in isolated and membrane-bound light harvesting complexes (LHCs). The technique has the definite advantage to give information on how the pigments [...] Read more.
Light-induced infrared difference spectroscopy (IR-DS) has been used, especially in the last decade, to investigate early photophysics, energy transfer and photoprotection mechanisms in isolated and membrane-bound light harvesting complexes (LHCs). The technique has the definite advantage to give information on how the pigments and the other constituents of the biological system (proteins, membranes, etc.) evolve during a given photoreaction. Different static and time-resolved approaches have been used. Compared to the application of IR-DS to photosynthetic Reaction Centers (RCs), however, IR-DS applied to LHCs is still in an almost pioneering age: very often sophisticated techniques (step-scan FTIR, ultrafast IR) or data analysis strategies (global analysis, target analysis, multivariate curve resolution) are needed. In addition, band assignment is usually more complicated than in RCs. The results obtained on the studied systems (chromatophores and RC-LHC supercomplexes from purple bacteria; Peridinin-Chlorophyll-a-Proteins from dinoflagellates; isolated LHCII from plants; thylakoids; Orange Carotenoid Protein from cyanobacteria) are summarized. A description of the different IR-DS techniques used is also provided, and the most stimulating perspectives are also described. Especially if used synergically with other biophysical techniques, light-induced IR-DS represents an important tool in the investigation of photophysical/photochemical reactions in LHCs and LHC-containing systems. Full article
(This article belongs to the Special Issue Light-Harvesting Complexes)
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