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Inorganics
Special Issues
Organometallic and Coordination Compounds for Optical and Energy-Related Applications
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Organometallic and Coordination Compounds for Optical and Energy-Related Applications

A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Organometallic Chemistry".

Deadline for manuscript submissions: closed (31 July 2020) | Viewed by 10612

Special Issue Editors

Prof. Dr. Francesca Tessore

E-Mail Website
Guest Editor
Department of Chemistry, University of Milan, Via C. Golgi 19, 20133 Milan, Italy
Interests: porphyrins; DSSC; DSPEC; water splitting; CO2 reduction; energy
Special Issues, Collections and Topics in MDPI journals
Dr. Gabriele Di Carlo

E-Mail Website
Guest Editor
Department of Chemistry, University of Milan, Via C. Golgi 19, 20133 Milan, Italy
Interests: porphyrins; DSSC; DSPEC; water splitting; CO2 reduction; energy
Special Issues, Collections and Topics in MDPI journals
Dr. Alessio Orbelli Biroli

E-Mail Website
Guest Editor
Istituto di Scienze e Tecnologie Chimiche del CNR (CNR-SCITEC), Via Golgi 19, 20133 Milano, Italy
Interests: supramolecular chemistry; coordination chemistry; nonlinear optics; photovoltaics; porphyrin; siloxane; absorption and emission spectroscopy; electrochemistry; thin film deposition

Special Issue Information

Dear Colleagues,

In recent decades, organometallic and coordination compounds have been widely exploited as the key components of molecular materials for advanced applications, such as optoelectronics, photonics, photovoltaics, and artificial photosynthesis. Indeed, the presence of metal can induce low-energy and high-intensity transitions, which can be finely tuned by changing the nature and coordinative environment to produce an optimal match for the requirements of a specific use. This Special Issue, dedicated to Professor Maddalena Pizzotti for her 70th birthday, will gather original research papers and reviews covering all the topics concerning optical and energy-related applications of metal complexes, with the aim of sharing knowledge with a broader audience, thanks to the open access policy of Inorganics. We strongly encourage scientists involved in these fascinating and cutting-edge research fields to contribute.

Dr. Francesca Tessore
Dr. Gabriele Di Carlo
Dr. Alessio Orbelli Biroli
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Inorganics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • organometallic complexes
  • coordination compounds
  • nonlinear optics
  • photovoltaics
  • dye-sensitized solar cells
  • dye-sensititized photoelectrosynthetic cells
  • artificial photosynthesis
  • water splitting

Published Papers (4 papers)

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Research

13 pages, 1167 KiB  
Article
Second Order Nonlinear Optical Properties of 4-Styrylpyridines Axially Coordinated to A4 ZnII Porphyrins: A Comparative Experimental and Theoretical Investigation
by Francesca Tessore, Gabriele Di Carlo, Alessandra Forni, Stefania Righetto, Francesca Limosani and Alessio Orbelli Biroli
Inorganics 2020, 8(8), 45; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8080045 - 14 Aug 2020
Cited by 8 | Viewed by 2096
Abstract
In this research, two 4-styrylpyridines carrying an acceptor –NO2 (L1) or a donor –NMe2 group (L2) were axially coordinated to A4 ZnII porphyrins displaying in 5,10,15,20 meso position aryl moieties with remarkable electron withdrawing properties [...] Read more.
In this research, two 4-styrylpyridines carrying an acceptor –NO2 (L1) or a donor –NMe2 group (L2) were axially coordinated to A4 ZnII porphyrins displaying in 5,10,15,20 meso position aryl moieties with remarkable electron withdrawing properties (pentafluorophenyl (TFP)), and with moderate to strong electron donor properties (phenyl (TPP) < 3,5-di-tert-butylphenyl (TBP) < bis(4-tert-butylphenyl)aniline) (TNP)). The second order nonlinear optical (NLO) properties of the resulting complexes were measured in CHCl3 solution by the Electric-Field-Induced Second Harmonic generation technique, and the quadratic hyperpolarizabilities βλ were compared to the Density Functional Theory (DFT)-calculated scalar quantities β||. Our combined experimental and theoretical approach shows that different interactions are involved in the NLO response of L1- and L2-substituted A4 ZnII porphyrins, suggesting a role of backdonation-type mechanisms in the determination of the negative sign of Electric-Field-Induced Second Harmonic generation (EFISH) βλ, and a not negligible third order contribution for L1-carrying complexes. Full article
(This article belongs to the Special Issue Organometallic and Coordination Compounds for Optical and Energy-Related Applications)
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12 pages, 1361 KiB  
Article
Cyclometalated Ir(III) Complexes with Curcuminoid Ligands as Active Second-Order NLO Chromophores and Building Blocks for SHG Polymeric Films
by Mattia Fontani, Alessia Colombo, Claudia Dragonetti, Stefania Righetto, Dominique Roberto and Daniele Marinotto
Inorganics 2020, 8(5), 36; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8050036 - 14 May 2020
Cited by 6 | Viewed by 2597
Abstract
The second-order nonlinear optical (NLO) properties of iridium(III) complexes having two cyclometalated 2-phenylpyridines and curcumin or tetrahydrocurcumin as ancillary ligand have been investigated both in solution and as guest in a polymeric organic matrix. In solution, these complexes are characterized by a significant [...] Read more.
The second-order nonlinear optical (NLO) properties of iridium(III) complexes having two cyclometalated 2-phenylpyridines and curcumin or tetrahydrocurcumin as ancillary ligand have been investigated both in solution and as guest in a polymeric organic matrix. In solution, these complexes are characterized by a significant second-order NLO response, as determined by the Electric Field Induced Second Harmonic (EFISH) technique, like the related complex with acetylacetonate. Whereas the low second-harmonic generation response of a composite film of [Ir(2-phenylpyridine)2(acetylacetonate)] in polymethyl methacrylate was not stable and fell down to zero upon turning off the electric field. A good and stable response was obtained with a film based on the iridium(III) complex bearing two cyclometalated 2-phenylpyridines and curcumin. Full article
(This article belongs to the Special Issue Organometallic and Coordination Compounds for Optical and Energy-Related Applications)
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13 pages, 2631 KiB  
Article
Chimera Diimine Ligands in Emissive [Cu(P^P)(N^N)][PF6] Complexes
by Marco Meyer, Fabian Brunner, Alessandro Prescimone, Edwin C. Constable and Catherine E. Housecroft
Inorganics 2020, 8(5), 33; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8050033 - 12 May 2020
Cited by 6 | Viewed by 2789
Abstract
The syntheses and characterizations of the chelating ligand 6-chloro-6′-methyl-2,2′-bipyridine (6-Cl-6′-Mebpy) and of the copper(I) compounds [Cu(POP)(6-Cl-6′-Mebpy)][PF6] and [Cu(xantphos)(6-Cl-6′-Mebpy)][PF6] (POP = bis(2-(diphenylphosphanyl)phenyl)ether and xantphos = 4,5-bis(diphenylphosphanyl)-9,9-dimethyl-9H-xanthene) are described. The single crystal structures of both complexes were determined; the [...] Read more.
The syntheses and characterizations of the chelating ligand 6-chloro-6′-methyl-2,2′-bipyridine (6-Cl-6′-Mebpy) and of the copper(I) compounds [Cu(POP)(6-Cl-6′-Mebpy)][PF6] and [Cu(xantphos)(6-Cl-6′-Mebpy)][PF6] (POP = bis(2-(diphenylphosphanyl)phenyl)ether and xantphos = 4,5-bis(diphenylphosphanyl)-9,9-dimethyl-9H-xanthene) are described. The single crystal structures of both complexes were determined; the copper(I) ion is in a distorted tetrahedral environment and in [Cu(xantphos)(6-Cl-6′-Mebpy)][PF6], the disorder of the 6-Cl-6′-Mebpy ligand indicates there is no preference of the ‘bowl’-like cavity of the xanthene unit to host either the methyl or chloro-substituent, consistent with comparable steric effects of the two groups. The electrochemical and photophysical properties of [Cu(POP)(6-Cl-6′-Mebpy)][PF6] and [Cu(xantphos)(6-Cl-6′-Mebpy)][PF6] were investigated and are compared with those of the related compounds containing 6,6′-dichloro-2,2′-bipyridine or 6,6′-dimethyl-2,2′-bipyridine ligands. Trends in properties of the [Cu(P^P)(N^N)]+ complexes were consistent with 6-Cl-6′-Mebpy behaving as a combination of the two parent ligands. Full article
(This article belongs to the Special Issue Organometallic and Coordination Compounds for Optical and Energy-Related Applications)
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15 pages, 2144 KiB  
Article
An Optical Power Limiting and Ultrafast Photophysics Investigation of a Series of Multi-Branched Heavy Atom Substituted Fluorene Molecules
by Hampus Lundén, Delphine Pitrat, Jean-Christophe Mulatier, Cyrille Monnereau, Iulia Minda, Adrien Liotta, Pavel Chábera, Didrik K. Hopen, Cesar Lopes, Stéphane Parola, Tönu Pullerits, Chantal Andraud and Mikael Lindgren
Inorganics 2019, 7(10), 126; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics7100126 - 18 Oct 2019
Cited by 3 | Viewed by 2581
Abstract
A common molecular design paradigm for optical power limiting (OPL) applications is to introduce heavy atoms that promote intersystem crossing and triplet excited states. In order to investigate this effect, three multi-branched fluorene molecules were prepared where the central moiety was either an [...] Read more.
A common molecular design paradigm for optical power limiting (OPL) applications is to introduce heavy atoms that promote intersystem crossing and triplet excited states. In order to investigate this effect, three multi-branched fluorene molecules were prepared where the central moiety was either an organic benzene unit, para-dibromobenzene, or a platinum(II)–alkynyl unit. All three molecules showed good nanosecond OPL performance in solution. However, only the dibromobenzene and Pt–alkynyl compounds showed strong microsecond triplet excited state absorption (ESA). To investigate the photophysical cause of the OPL, especially for the fully organic molecule, photokinetic measurements including ultrafast pump–probe spectroscopy were performed. At nanosecond timescales, the ESA of the organic molecule was larger than the two with intersystem crossing (ISC) promoters, explaining its good OPL performance. This points to a design strategy where the singlet-state ESA is balanced with the ISC rate to increase OPL performance at the beginning of a nanosecond pulse. Full article
(This article belongs to the Special Issue Organometallic and Coordination Compounds for Optical and Energy-Related Applications)
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