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Wang J, Apostol P, Rambabu D, Guo X, Liu X, Robeyns K, Du M, Zhang Y, Pal S, Markowski R, Lucaccioni F, Lakraychi AE, Morari C, Gohy JF, Gupta D, Vlad A. Revealing the reversible solid-state electrochemistry of lithium-containing conjugated oximates for organic batteries. Sci Adv 2023; 9:eadg6079. [PMID: 37115926 PMCID: PMC10146882 DOI: 10.1126/sciadv.adg6079] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In the rising advent of organic Li-ion positive electrode materials with increased energy content, chemistries with high redox potential and intrinsic oxidation stability remain a challenge. Here, we report the solid-phase reversible electrochemistry of the oximate organic redox functionality. The disclosed oximate chemistries, including cyclic, acyclic, aliphatic, and tetra-functional stereotypes, uncover the complex interplay between the molecular structure and the electroactivity. Among the exotic features, the most appealing one is the reversible electrochemical polymerization accompanying the charge storage process in solid phase, through intermolecular azodioxy bond coupling. The best-performing oximate delivers a high reversible capacity of 350 mAh g-1 at an average potential of 3.0 versus Li+/Li0, attaining 1 kWh kg-1 specific energy content at the material level metric. This work ascertains a strong link between electrochemistry, organic chemistry, and battery science by emphasizing on how different phases, mechanisms, and performances can be accessed using a single chemical functionality.
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Affiliation(s)
- Jiande Wang
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Petru Apostol
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Darsi Rambabu
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Xiaolong Guo
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Xuelian Liu
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Koen Robeyns
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Mengyuan Du
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Yan Zhang
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
- College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Shubhadeep Pal
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Robert Markowski
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Fabio Lucaccioni
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Alae Eddine Lakraychi
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Cristian Morari
- Institutul Național de Cercetare-Dezvoltare pentru Tehnologii Izotopice și Moleculare Cluj-Napoca, Cluj-Napoca, România
| | - Jean-François Gohy
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Deepak Gupta
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
- Corresponding author. (D.G.); (A.V.)
| | - Alexandru Vlad
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
- Corresponding author. (D.G.); (A.V.)
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Morari C, Buimaga-Iarinca L, Turcu R. On the contribution of phonons to electrochemical potential of Li-ion metal-organic frameworks. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2022.141734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Buimaga-Iarinca L, Morari C. Calculation of infrared spectra for adsorbed molecules from the dipole autocorrelation function. Theor Chem Acc 2022. [DOI: 10.1007/s00214-022-02932-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wang J, Guo X, Apostol P, Liu X, Robeyns K, Gence L, Morari C, Gohy JF, Vlad A. High performance Li-, Na-, and K-ion storage in electrically conducting coordination polymers. Energy Environ Sci 2022; 15:3923-3932. [PMID: 36275406 PMCID: PMC9472235 DOI: 10.1039/d2ee00566b] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 06/29/2022] [Indexed: 05/15/2023]
Abstract
Coordination polymers (CPs) made of redox-active organic moieties and metal ions emerge as an important class of electroactive materials for battery applications. However, the design and synthesis of high voltage alkali-cation reservoir anionic CPs remains challenging, hindering their practical applications. Herein, we report a family of electrically conducting alkali-cation reservoir CPs with the general formula of A2-TM-PTtSA (wherein A = Li+, Na+, or K+; TM = Fe2+, Co2+, or Mn2+; and PTtSA = benzene-1,2,4,5-tetra-methylsulfonamide). The incorporation of transition metal centers not only enables intrinsic high electrical conductivity, but also shows an impressive redox potential increase of as high as 1 V as compared to A4-PTtSA analogues, resulting in a class of organometallic cathode materials with a high average redox potential of 2.95-3.25 V for Li-, Na- and K-ion batteries. A detailed structure - composition - physicochemical properties - performance correlation study is provided relying on experimental and computational analysis. The best performing candidate shows excellent rate capability (86% of the nominal capacity retained at 10C rate), remarkable cycling stability (96.5% after 1000 cycles), outstanding tolerance to low carbon content (5 wt%), high mass loading (50 mg cm-2), and extreme utilisation conditions of low earth orbit space environment tests. The significance of the disclosed alkali-ion reservoir cathodes is further emphasized by utilizing conventional Li-host graphite anode for full cell assembly, attaining a record voltage of 3 V in an organic cathode Li-ion proof-of-concept cell.
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Affiliation(s)
- Jiande Wang
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain Louvain-la-Neuve Belgium
| | - Xiaolong Guo
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain Louvain-la-Neuve Belgium
| | - Petru Apostol
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain Louvain-la-Neuve Belgium
| | - Xuelian Liu
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain Louvain-la-Neuve Belgium
| | - Koen Robeyns
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain Louvain-la-Neuve Belgium
| | - Loïk Gence
- Instituto de Física, Pontificia Universidad Católica de Chile Santiago Chile
| | - Cristian Morari
- Institutul National de Cercetare-Dezvoltare pentru Tehnologii Izotopice şi Moleculare Cluj-Napoca Cluj-Napoca Romania
| | - Jean-François Gohy
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain Louvain-la-Neuve Belgium
| | - Alexandru Vlad
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain Louvain-la-Neuve Belgium
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Ahsan A, Buimaga-Iarinca L, Nijs T, Nowakowska S, Sk R, Mousavi SF, Heydari M, Stöhr M, Zaman SS, Morari C, Gade LH, Jung TA. Induced Fit and Mobility of Cycloalkanes within Nanometer-Sized Confinements at 5 K. J Phys Chem Lett 2022; 13:7504-7513. [PMID: 35943183 DOI: 10.1021/acs.jpclett.2c01592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Host-guest architectures provide ideal systems for investigating site-specific physical and chemical effects. Condensation events in nanometer-sized confinements are particularly interesting for the investigation of intermolecular and molecule-surface interactions. They may be accompanied by conformational adjustments representing induced fit packing patterns. Here, we report that the symmetry of small clusters formed upon condensation, their registry with the substrate, their lateral packing, and their adsorption height are characteristically modified by the packing of cycloalkanes in confinements. While cyclopentane and cycloheptane display cooperativity upon filling of the hosting pores, cyclooctane and to a lesser degree cyclohexane diffusively redistribute to more favored adsorption sites. The dynamic behavior of cyclooctane is surprising at 5 K given the cycloalkane melting point of >0 °C. The site-specific modification of the interaction and behavior of adsorbates in confinements plays a crucial role in many applications of three-dimensional porous materials as gas storage agents or catalysts/biocatalysts.
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Affiliation(s)
- Aisha Ahsan
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Luiza Buimaga-Iarinca
- CETATEA, National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293 Cluj-Napoca, Romania
| | - Thomas Nijs
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Sylwia Nowakowska
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Rejaul Sk
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - S Fatemeh Mousavi
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Mehdi Heydari
- Laboratory for X-ray Nanoscience and Technologies, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Meike Stöhr
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Sameena S Zaman
- Integrated Sciences and Mathematics, Habib University, Block 18, Gulistan-e-Jauhar, University Avenue, Off Shahrah-e-Faisal Road, Karachi 75290, Sindh, Pakistan
| | - Cristian Morari
- CETATEA, National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293 Cluj-Napoca, Romania
| | - Lutz H Gade
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Thomas A Jung
- Laboratory for X-ray Nanoscience and Technologies, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
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Liu X, Wang J, Du M, Robeyns K, Filinchuk Y, Zhu Q, Kumar V, Garcia Y, Borodi G, Morari C, Gohy J, Vlad A. New Cathode Materials in the Fe-PO 4 -F Chemical Space for High-Performance Sodium-Ion Storage. Adv Sci (Weinh) 2022; 9:e2200924. [PMID: 35619333 PMCID: PMC9353465 DOI: 10.1002/advs.202200924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 04/29/2022] [Indexed: 06/15/2023]
Abstract
Sodium and iron make up the perfect combination for the growing demand for sustainable energy storage systems, given the natural abundance and sustainability of the two building block elements. However, most sodium-iron electrode chemistries are plagued by intrinsic low energy densities with continuous ongoing efforts to solve this. Herein, the chemical space of a series of (meta)stable, off-stoichiometric Fe-PO4 -F phases is analyzed. Some are found to display markedly improved electrochemical activity for sodium storage, as compared to the amorphous or thermodynamically stable phases of equivalent composition. The metastable crystalline Na1.2 Fe1.2 PO4 F0.6 delivers a reversible capacity of more than 140 mAh g-1 with an average discharge potential of 2.9 V (vs Na+ /Na0 ) resulting in a practical specific energy density of 400 Wh kg-1 (estimated at the material level), outperforming many developed Fe-PO4 analogs thus far, with further multiple possibilities to be explored toward improved energy storage metrics. Overall, this study unlocks the possibilities of off-stoichiometric Fe-PO4 -F cathode materials and reveals the importance to explore the oft-overlooked metastable or transient state materials for energy storage.
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Affiliation(s)
- Xuelian Liu
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Jiande Wang
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Mengyuan Du
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Koen Robeyns
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Yaroslav Filinchuk
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Qi Zhu
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Varun Kumar
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Yann Garcia
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Gheorghe Borodi
- Institutul National de Cercetare‐Dezvoltare pentru Tehnologii Izotopice si Moleculare Cluj‐NapocaStr. Donat nr. 67‐103, PO 5 Box 700Cluj‐Napoca400293Romania
| | - Cristian Morari
- Institutul National de Cercetare‐Dezvoltare pentru Tehnologii Izotopice si Moleculare Cluj‐NapocaStr. Donat nr. 67‐103, PO 5 Box 700Cluj‐Napoca400293Romania
| | - Jean‐Francois Gohy
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
| | - Alexandru Vlad
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainLouvain‐la‐NeuveB‐1348Belgium
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7
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Wang J, Lakraychi AE, Liu X, Sieuw L, Morari C, Poizot P, Vlad A. Conjugated sulfonamides as a class of organic lithium-ion positive electrodes. Nat Mater 2021; 20:665-673. [PMID: 33318677 DOI: 10.1038/s41563-020-00869-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 11/03/2020] [Indexed: 05/27/2023]
Abstract
The applicability of organic battery materials in conventional rocking-chair lithium (Li)-ion cells remains deeply challenged by the lack of Li-containing and air-stable organic positive electrode chemistries. Decades of experimental and theoretical research in the field has resulted in only a few recent examples of Li-reservoir materials, all of which rely on the archetypal conjugated carbonyl redox chemistry. Here we extend the chemical space of organic Li-ion positive electrode materials with a class of conjugated sulfonamides (CSAs) and show that the electron delocalization on the sulfonyl groups endows the resulting CSAs with intrinsic oxidation and hydrolysis resistance when handled in ambient air, and yet display reversible electrochemistry for charge storage. The formal redox potential of the uncovered CSA chemistries spans a wide range between 2.85 V and 3.45 V (versus Li+/Li0), finely tunable through electrostatic or inductive molecular design. This class of organic Li-ion positive electrode materials challenges the realm of the inorganic battery cathode, as this first generation of CSA chemistries already displays gravimetric energy storage metrics comparable to those of the stereotypical LiFePO4.
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Affiliation(s)
- Jiande Wang
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Alae Eddine Lakraychi
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Xuelian Liu
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Louis Sieuw
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Cristian Morari
- Institutul National de Cercetare-Dezvoltare pentru Tehnologii Izotopice si Moleculare Cluj-Napoca, Cluj-Napoca, Romania
| | - Philippe Poizot
- Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, Nantes, France
| | - Alexandru Vlad
- Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, Louvain-la-Neuve, Belgium.
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Miklík D, Fatemeh Mousavi S, Burešová Z, Middleton A, Matsushita Y, Labuta J, Ahsan A, Buimaga-Iarinca L, Karr PA, Bureš F, Richards GJ, Švec P, Mori T, Ariga K, Wakayama Y, Morari C, D’Souza F, Jung TA, Hill JP. Pyrazinacenes exhibit on-surface oxidation-state-dependent conformational and self-assembly behaviours. Commun Chem 2021; 4:29. [PMID: 36697553 PMCID: PMC9814942 DOI: 10.1038/s42004-021-00470-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 02/09/2021] [Indexed: 01/31/2023] Open
Abstract
Acenes and azaacenes lie at the core of molecular materials' applications due to their important optical and electronic features. A critical aspect is provided by their heteroatom multiplicity, which can strongly affect their properties. Here we report pyrazinacenes containing the dihydro-decaazapentacene and dihydro-octaazatetracene chromophores and compare their properties/functions as a model case at an oxidizing metal substrate. We find a distinguished, oxidation-state-dependent conformational adaptation and self-assembly behaviour and discuss the analogies and differences of planar benzo-substituted decaazapentacene and octaazatetracene forms. Our broad experimental and theoretical study reveals that decaazapentacene is stable against oxidation but unstable against reduction, which is in contrast to pentacene, its C-H only analogue. Decaazapentacenes studied here combine a planar molecular backbone with conformationally flexible substituents. They provide a rich model case to understand the properties of a redox-switchable π-electronic system in solution and at interfaces. Pyrazinacenes represent an unusual class of redox-active chromophores.
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Affiliation(s)
- David Miklík
- grid.21941.3f0000 0001 0789 6880International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki Japan ,grid.11028.3a000000009050662XInstitute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic
| | - S. Fatemeh Mousavi
- grid.6612.30000 0004 1937 0642Department of Physics, University of Basel, Basel, Switzerland
| | - Zuzana Burešová
- grid.11028.3a000000009050662XInstitute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic
| | - Anna Middleton
- grid.266869.50000 0001 1008 957XDepartment of Chemistry, University of North Texas, Denton, TX USA
| | - Yoshitaka Matsushita
- grid.21941.3f0000 0001 0789 6880Research Network and Facility Services Division, National Institute for Materials Science, Tsukuba, Ibaraki Japan
| | - Jan Labuta
- grid.21941.3f0000 0001 0789 6880International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki Japan
| | - Aisha Ahsan
- grid.6612.30000 0004 1937 0642Department of Physics, University of Basel, Basel, Switzerland
| | - Luiza Buimaga-Iarinca
- grid.435410.70000 0004 0634 1551National Institute for Research and Development of Isotopic and Molecular Technologies (NIRDIMT), Cluj-Napoca, Romania
| | - Paul A. Karr
- grid.439142.90000 0001 0357 7380Department of Physical Sciences and Mathematics, Wayne State College, Wayne, NE USA
| | - Filip Bureš
- grid.11028.3a000000009050662XInstitute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic
| | - Gary J. Richards
- grid.21941.3f0000 0001 0789 6880International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki Japan ,grid.419152.a0000 0001 0166 4675Department of Applied Chemistry, Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama-shi, Saitama Japan
| | - Pavel Švec
- grid.21941.3f0000 0001 0789 6880International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki Japan
| | - Toshiyuki Mori
- grid.21941.3f0000 0001 0789 6880Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science, Tsukuba, Ibaraki Japan
| | - Katsuhiko Ariga
- grid.21941.3f0000 0001 0789 6880International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki Japan ,grid.26999.3d0000 0001 2151 536XGraduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
| | - Yutaka Wakayama
- grid.21941.3f0000 0001 0789 6880International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki Japan
| | - Cristian Morari
- grid.435410.70000 0004 0634 1551National Institute for Research and Development of Isotopic and Molecular Technologies (NIRDIMT), Cluj-Napoca, Romania
| | - Francis D’Souza
- grid.266869.50000 0001 1008 957XDepartment of Chemistry, University of North Texas, Denton, TX USA
| | - Thomas A. Jung
- grid.5991.40000 0001 1090 7501Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, Villigen, Switzerland
| | - Jonathan P. Hill
- grid.21941.3f0000 0001 0789 6880International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki Japan
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Calborean A, Murariu T, Morari C. Optimized lead-acid grid architectures for automotive lead-acid batteries: An electrochemical analysis. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.137880] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Malaeru T, Patroi D, Enescu E, Georgescu G, Manta E, Patroi EA, Marinescu V, Morari C, Lungu MV. Synthesis and Characterization of Water Dispersible Iron Oxide (�a-Fe2O3) Nanoparticles for Biomedical Applications. Rev Chim 2020. [DOI: 10.37358/rc.20.10.8353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In this study, L-lysine coated �a-Fe2O3 nanoparticles were synthesized by a chemical approach in two steps. In the first step �a-Fe2O3 nanoparticles were synthesized by a polyol-reduction method. XRD analysis confirmed the presence of cubic maghemite phase with an average crystallite size of 9.2 nm. SEM analysis showed that the prepared �a-Fe2O3 nanoparticles have a spherical structural morphology with the tendency of agglomeration and with size in the range 8.36- 10.69 nm. The �a-Fe2O3 nanoparticles were coated with L-lysine in the second stage in an aqueous dispersion with ultrasonication followed by a gentle heating at 40��C. FT-IR spectroscopy confirmed the presence of L-lysine on the nanoparticles surface and the Zeta potential also supported the coating of nanoparticles with a hydrophilic layer of amino acid (L-lysine) and a good stability in aqueous medium. Hysteresis loop shows a ferromagnetic behavior at room temperature for both samples.
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Malaeru T, Enescu E, Georgescu G, Patroi D, Manta E, Patroi EA, Morari C, Marinescu V. Synthesis and Characterization of Hydrophilic gama-Fe2O3 Nanoparticles for Biomedical Applications. Rev Chim 2019. [DOI: 10.37358/rc.19.6.7268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The hydrophilic g-Fe2O3 nanoparticles coated with polyvinylpyrrolidone (PVP) were prepared in one step of the modified polyol method combined with an additional heat treating. The presence of maghemite (g-Fe2O3) phase was confirmed by using X-ray diffraction (XRD) and Raman Spectrometry on powder. FT-IR spectroscopy confirmed the presence of PVP on the nanoparticles surface and the Zeta potential also supported the coating of nanoparticles with a layer of PVP and a good stability in aqueous medium. SEM analysis showed that the prepared g-Fe2O3 nanoparticles have a spherical structural morphology with the tendency of agglomeration. Hysteresis loop shows a ferromagnetic behaviour at room temperature with a saturation magnetization up to 57 emu/g.
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Malaeru T, Patroi EA, Marinescu V, Oprea O, Patroi D, Morari C, Manta E, Georgescu G. Preparation and Characterization of Fe3O4 Magnetic Nanofluid in Vegetable Oil. Rev Chim 2019. [DOI: 10.37358/rc.19.2.6935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This paper reports the synthesis of Fe3O4 nanoparticles with a hydrophobic surface functionalized with oleic acid through a simple and efficient route in air atmosphere and by co-precipitation. The hydrophobic surfactant agent was added in the magnetic crystal growth stage. Magnetic nanofluid was obtained by ultrasonic dispersion of magnetic nanoparticles in a carrier liquid � vegetable oil. The sample as powder has been characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, Transmission Electron Microscopy (TEM), and Vibrating Sample Magnetometry (VSM) at room temperature. The magnetic nanofluid in vegetal oil was investigated by determining the stability of the nanoparticles in the vegetable oil through UV-Vis spectrometry method, the magnetic properties through Vibrating Sample Magnetometry (VSM) method at room temperature, and thermal conductivity as function of magnetic nanoparticles volume concentration and of temperature.
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Buimaga-Iarinca L, Morari C. The effect of translation on the binding energy for transition-metal porphyrines adsorbed on Ag(111) surface. Beilstein J Nanotechnol 2019; 10:706-717. [PMID: 30931212 PMCID: PMC6423576 DOI: 10.3762/bjnano.10.70] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 02/22/2019] [Indexed: 06/09/2023]
Abstract
The characteristics of interaction between six transition-metal porphyrines and the Ag(111) surface are detailed here as resulted from DFT calculations. Van der Waals interactions as well as the strong correlation in 3d orbitals of transition metals were taken into account in all calculations, including the structural relaxation. For each system we investigate four relative positions of the metallic atom on top the surface. We show that the interaction between the transition metal and silver is the result of a combination between the dispersion interaction, charge transfer and weak chemical interaction. The detailed analysis of the physical properties, such as dipolar and magnetic moments and the molecule-surface charge transfer, analyzed for different geometric configurations allows us to propose qualitative models, relevant for the understanding of the self-assembly processes and related phenomena.
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Affiliation(s)
- Luiza Buimaga-Iarinca
- National Institute for Research and Development of Isotopic and Molecular Technologies,67-103 Donat, 400293 Cluj-Napoca, Romania
| | - Cristian Morari
- National Institute for Research and Development of Isotopic and Molecular Technologies,67-103 Donat, 400293 Cluj-Napoca, Romania
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Buimaga-Iarinca L, Morari C. Charge transport pathways in metal porphyrin as interplay between long and short range scattering processes. Nanotechnology 2019; 30:045204. [PMID: 30468678 DOI: 10.1088/1361-6528/aaed75] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We have investigated the ballistic transport for Mn, Fe-porphyrin molecules in contact with Au(111) electrodes by using density functional theory. We show that the information resulted from the projected density of electronic states does not provide a complete picture of the transport mechanism. Instead, we propose a methodology based on the concept of the orbital projected transmissions for selected groups of atoms. We have found that the transmission channels for occupied states can be assigned to short range scattering processes at gold-molecule interface, while for the states above Fermi level the transmission takes place via long range scattering processes. The interplay between these two conduction mechanisms is responsible for the transport path in metal-porphyrin; our model is in qualitative agreement with the existing experimental data on transport pathway on single porphyrin molecules.
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Affiliation(s)
- L Buimaga-Iarinca
- National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293 Cluj-Napoca, Romania
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Buimaga-Iarinca L, Morari C. Translation of metal-phthalocyanines adsorbed on Au(111): from van der Waals interaction to strong electronic correlation. Sci Rep 2018; 8:12728. [PMID: 30143696 PMCID: PMC6109120 DOI: 10.1038/s41598-018-31147-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 08/13/2018] [Indexed: 11/23/2022] Open
Abstract
Using first-principles calculations, we investigate the binding energy for six transition metal - phthalocyanine molecules adsorbed on Au(111). We focus on the effect of translation on molecule - surface physical properties; van der Waals interactions as well as the strong correlation in d orbitals of transition metals are taken into account in all calculations. We found that dispersion interaction and charge transfer have the dominant role in the molecule-surface interaction, while the interaction between the transition metal and gold has a rather indirect influence over the physics of the molecule-surface system. A detailed analysis of the physical properties of the adsorbates at different geometric configurations allows us to propose qualitative models to account for all values of interface dipole charge transfer and magnetic moment of metal-phthalocyanines adsorbed on Au(111).
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Affiliation(s)
- L Buimaga-Iarinca
- National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293, Cluj-Napoca, Romania
| | - C Morari
- National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293, Cluj-Napoca, Romania.
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Calborean A, Morari C, Maldivi P. Combined molecular and periodic DFT analysis of the adsorption of co macrocycles on graphene. J Comput Chem 2018; 39:130-138. [PMID: 29094373 DOI: 10.1002/jcc.25093] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 09/27/2017] [Accepted: 10/16/2017] [Indexed: 01/09/2023]
Abstract
The molecular doping of graphene with π-stacked conjugated molecules has been widely studied during the last 10 years, both experimentally or using first-principle calculations, mainly with strongly acceptor or donor molecules. Macrocyclic metal complexes have been far less studied and their behavior on graphene is less clear-cut. The present density functional theory study of cobalt porphyrin and phthalocyanine adsorbed on monolayer or bilayer graphene allows to compare the outcomes of two models, either a finite-sized flake of graphene or an infinite 2D material using periodic calculations. The electronic structures yielded by both models are compared, with a focus on the density of states around the Fermi level. Apart from the crucial choice of calculation conditions, this investigation also shows that unlike strongly donating or accepting organic dopants, these macrocycles do not induce a significant doping of the graphene sheet and that a finite size model of graphene flake may be confidently used for most modeling purposes. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Adrian Calborean
- National Institute for Research and Development of Isotopic and Molecular Technologies, Department of Molecular and Biomolecular Physics, Donat 67-103, Cluj-Napoca, 400293, Romania
| | - Cristian Morari
- National Institute for Research and Development of Isotopic and Molecular Technologies, Department of Molecular and Biomolecular Physics, Donat 67-103, Cluj-Napoca, 400293, Romania
| | - Pascale Maldivi
- University of Grenoble Alpes, CEA, CNRS, INAC, SYMMES, Grenoble, F-38000, France
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Bogdan M, Floare CG, Buimaga-Iarinca L, Morari C, Pirnau A. NMR study and computational assays of meclofenamic Na salt and β-cyclodextrin inclusion complex. J INCL PHENOM MACRO 2016. [DOI: 10.1007/s10847-016-0610-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Morari C, Beiuşeanu F, Di Marco I, Peters L, Burzo E, Mican S, Chioncel L. Magnetism and electronic structure calculation of SmN. J Phys Condens Matter 2015; 27:115503. [PMID: 25738224 DOI: 10.1088/0953-8984/27/11/115503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The results of the electronic structure calculations performed on SmN by using the LDA+U method with and without including the spin-orbit coupling are presented. Within the LDA+U approach, a N(2p) band polarization of about 0.3 μB is induced by Sm(4f)-N(2p) hybridization, and a half-metallic ground state is obtained. By including spin-orbit coupling the magnetic structure was shown to be antiferromagnetic of type II, with Sm spin and orbital moments nearly cancelling. This results into a semiconducting ground state, which is in agreement with experimental results.
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Affiliation(s)
- C Morari
- National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath, RO-400293 Cluj Napoca, Romania
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Muntean CM, Bratu I, Leopold N, Morari C, Buimaga-Iarinca L, Purcaru MAP. Subpicosecond surface dynamics in genomic DNA from in vitro-grown plant species: a SERS assessment. Phys Chem Chem Phys 2015; 17:21323-30. [PMID: 25687823 DOI: 10.1039/c4cp05425c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work the surface-enhanced Raman total half band widths of seven genomic DNAs from leaves of chrysanthemum (Dendranthema grandiflora Ramat.), common sundew (Drosera rotundifolia L.), edelweiss (Leontopodium alpinum Cass), Epilobium hirsutum L., Hypericum richeri ssp. transsilvanicum (Čelak) Ciocârlan, rose (Rosa x hybrida L.) and redwood (Sequoia sempervirens D. Don. Endl.) have been measured. We have shown that surface-enhanced Raman spectroscopy (SERS) can be used to study the fast subpicosecond dynamics of DNA in the proximity of a metallic surface. The dependencies of the total half band widths and the global relaxation times, on the DNA molecular subgroup structure and on the type of genomic DNA, are reported. In our study, the full widths at half-maximum (FWHMs) for the SERS bands of genomic DNAs from different leaf tissues are typically in the wavenumber range from 15 to 55 cm(-1). Besides, it can be observed that molecular relaxation processes studied in this work have a global relaxation time smaller than 0.71 ps and larger than 0.19 ps. A comparison between different ranges of FT-Raman and SERS band parameters, respectively, corresponding to DNA extracted from leaf tissues is given. It is shown that the interaction between DNA and a metallic surface has the potential to lead to a shortening of the global relaxation times, as compared with molecular dynamics in solution. We have found that the surface dynamics of molecular subgroups in plant DNA is, in some cases, about two times faster than the solution dynamics of nucleic acids. This can be rationalized in a qualitative manner by invoking the complex landscape of the interaction energy between the molecule and the silver surface.
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Affiliation(s)
- Cristina M Muntean
- National Institute for Research & Development of Isotopic and Molecular Technologies, 67-103 Donat Str., 400293 Cluj-Napoca, Romania.
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Bogdan D, Morari C. Effect of van der Waals Interaction on the Geometric and Electronic Properties of DNA Nucleosides Adsorbed on Cu(111) Surface: A DFT Study. J Phys Chem A 2013; 117:4669-78. [DOI: 10.1021/jp401041a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Diana Bogdan
- National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath
Street, 400293 Cluj-Napoca, Romania
| | - Cristian Morari
- National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath
Street, 400293 Cluj-Napoca, Romania
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Cîntă Pînzaru S, Falamaş A, Dehelean C, Morari C, Venter M. Double Amino Functionalized Ag Nanoparticles as SERS Tags in Raman Diagnostic. CROAT CHEM ACTA 2013. [DOI: 10.5562/cca2067] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Morari C, Bogdan D, Muntean CM. Binding effects of Mn2+ and Zn2+ ions on the vibrational properties of guanine-cytosine base pairs in the Watson-Crick and Hoogsteen configurations. J Mol Model 2012; 18:4781-6. [DOI: 10.1007/s00894-012-1480-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Accepted: 05/21/2012] [Indexed: 11/28/2022]
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Bende A, Bogdan D, Muntean CM, Morari C. Localization and anharmonicity of the vibrational modes for GC Watson-Crick and Hoogsteen base pairs. J Mol Model 2011; 17:3265-74. [PMID: 21369937 DOI: 10.1007/s00894-011-1002-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Accepted: 01/28/2011] [Indexed: 10/18/2022]
Abstract
We present an ab initio study of the vibrational properties of cytosine and guanine in the Watson-Crick and Hoogsteen base pair configurations. The results are obtained by using two different implementations of the DFT method. We assign the vibrational frequencies to cytosine or to guanine using the vibrational density of states. Next, we investigate the importance of anharmonic corrections for the vibrational modes. In particular, the unusual anharmonic effect of the H(+) vibration in the case of the Hoogsteen base pair configuration is discussed.
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Affiliation(s)
- Attila Bende
- Molecular and Biomolecular Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Donath Street, No. 65-103, 400293 Cluj-Napoca, Romania
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Hangan A, Borodi G, Filip X, Tripon C, Morari C, Oprean L, Filip C. Structure of N-(5-ethyl-[1,3,4]-thiadiazole-2-yl)toluenesulfonamide by combined X-ray powder diffraction, 13C solid-state NMR and molecular modelling. Acta Crystallogr B Struct Sci 2010; 66:615-21. [DOI: 10.1107/s0108768110039327] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Accepted: 10/01/2010] [Indexed: 11/10/2022]
Abstract
The crystal structure solution of the title compound is determined from microcrystalline powder using a multi-technique approach that combines X-ray powder diffraction (XRPD) data analysis based on direct-space methods with information from 13C solid-state NMR (SSNMR), and molecular modelling using the GIPAW (gauge including projector augmented-wave) method. The space group is Pbca with one molecule in the asymmetric unit. The proposed methodology proves very useful for unambiguously characterizing the supramolecular arrangement adopted by the N-(5-ethyl-[1,3,4]-thiadiazole-2-yl)toluenesulfonamide molecules in the crystal, which consists of extended double strands held together by C—H...π non-covalent interactions.
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Morari C, Rungger I, Rocha AR, Sanvito S, Melinte S, Rignanese GM. Electronic transport properties of 1,1'-ferrocene dicarboxylic acid linked to Al(111) electrodes. ACS Nano 2009; 3:4137-4143. [PMID: 19928996 DOI: 10.1021/nn9012059] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The electronic transport properties of the 1,1'-ferrocene dicarboxylic acid sandwiched between Al(111) electrodes are studied using first-principles methods. The transmission spectra and the current-voltage characteristics are computed for various two-terminal device models and their relation with the electronic structure of the molecule is thoroughly discussed. The current-voltage characteristics are asymmetric, spin-independent, and vary with the anchoring structure of the molecule to the electrodes. A fine-tuning of the molecular conductance can be easily achieved by applying a gate potential, which is included in our simulations. Interestingly, a spin-polarized current can emerge as a consequence of the gate potential with the relative contribution of the two spin channels varying with the bias.
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Affiliation(s)
- Cristian Morari
- Universite Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
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Morari C, Bogdan D. A study of the anharmonic effects on the vibrational spectra of a realistic retinal chromophore model. Spectrochim Acta A Mol Biomol Spectrosc 2005; 61:1881-1886. [PMID: 15863060 DOI: 10.1016/j.saa.2004.07.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2004] [Revised: 07/20/2004] [Accepted: 07/20/2004] [Indexed: 05/24/2023]
Abstract
Ab initio and vibrational self-consistent field (VSCF) computations are used to investigate the vibrational normal coordinates of the protonated Schiff base (PSB) 4-cis-gamma,eta-dimethyl-C9H9 NH2+. The ground and the first excited states are investigated. Both harmonic and anharmonic frequencies for the first three overtones of the ground and first excited states are reported. Special attention is payed to the discussion of the normal coordinates modes that involve the central C=C bond which plays a significant role in the isomerization process.
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Affiliation(s)
- C Morari
- INCDTIM, Molecular Physics, P.O. BOX 700, Cluj Napoca, R-400293, str. Donath 71-103, Romania.
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Abstract
This work presents results of quantum mechanical calculations of reaction probabilities for the ion-neutral molecule collisions H- + D2 <--> HD + D-. Time-dependent wave packet propagations for total angular momentum J not equal to 0, including the full Coriolis coupling, are performed. The calculated state-to-state reaction probabilities using product Jacobi coordinates are compared with energy-resolved reaction probabilities calculated with the flux-operator using reactant Jacobi coordinates and with time-independent calculations. Differences between nearly converged integral cross sections and those using the J-shifting method and centrifugal sudden approximation and comparison with experimental results will be presented.
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Affiliation(s)
- Cristian Morari
- Theoretische Chemie, Universität Siegen, D-57068 Siegen, Germany
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Bogdan M, Caira MR, Bogdan D, Morari C, Fărcaş SI. Evidence of a Bimodal Binding between Diclofenac-Na and -Cyclodextrin in Solution. ACTA ACUST UNITED AC 2004. [DOI: 10.1023/b:jiph.0000048311.02653.23] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
Theoretical density functional theory (DFT) calculation, ab initio and experimental vibrational characterization of acridone were performed. The computed vibrational modes agree well with the experimental values of the related crystal structure. Surface enhanced Raman scattering (SERS) of acridone in silver colloids with different surface potential values was studied. FT-SERS spectrum of acridone revealed different adsorption behavior of the title compound on the silver particles.
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Affiliation(s)
- S Cîntã Pînzaru
- Physics Faculty, Babes-Bolyai University, Kogalniceanu 1, RO-3400 Cluj-Napoca, Romania.
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