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Takekiyo T, Yoshimura Y. Peculiar High-Pressure Phase Behavior of 1-Butyl-3-methylimidazolium Iodide. J Phys Chem B 2020; 124:7659-7667. [PMID: 32701280 DOI: 10.1021/acs.jpcb.0c04954] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigated the stability of the liquid phase of 1-butyl-3-methylimidazolium iodide (hereafter abbreviated as [C4mim][I]) up to 16.7 GPa at room temperature. We observed a peculiar phase transition behavior in the [C4mim][I] sample. In particular, a glassy state was formed at ∼1.3 GPa; however, the reddish-brown precipitate was formed probably due to concentrated I3- or I2- species that were formed above 12 GPa; [C4mim][I] showed a pressure-induced partial crystallization from the glassy state. We concluded that the conformation of [C4mim]+ is essential in iterative modulation to control the environmental formation of iodide precipitate.
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Affiliation(s)
- Takahiro Takekiyo
- Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
| | - Yukihiro Yoshimura
- Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
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Inaoka S, Iwata K, Saha S. Towards the critical understanding of selected vibrational features in biologically important dicyano aromatic conjugated molecules: Importance of electron donating/withdrawal groups and geometry associated with dicyano group. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 224:117419. [PMID: 31369992 DOI: 10.1016/j.saa.2019.117419] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/23/2019] [Accepted: 07/23/2019] [Indexed: 06/10/2023]
Abstract
The Raman spectra of a series of synthesized DC molecules (benzylidene malononitrile derivatives) with different electron donating (EDG) and electron withdrawing (EWG) group have been presented and analyzed with DFT calculated spectra. In particular, different functional groups effect on cyano stretching (∼2200 cm-1), phenyl ring breathing and alkenic double bond stretch which often appears mixed up (1475-1650 cm-1) are studied systematically for several aromatic conjugated DC derivatives. Interestingly, symmetric stretching frequency of the DC compounds having two CN groups at geminal position appears at higher wavenumber (by 11-15 cm-1) compared to their corresponding asymmetric stretch frequency. Angle (between dicyano group) dependent theoretical study indicates that the relative appearance of cyano symmetric/anti-symmetric stretching frequency depends on whether dicyano groups are at the geminal or vicinal position and the angle between them. Complete band assignments of observed Raman frequencies have been performed by potential energy distributions (PEDs) available in GAR2PED software. Our results will help to understand the vibrational feature of this important class of compounds in biological medium when used as probe.
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Affiliation(s)
- Shun Inaoka
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Japan
| | - Koichi Iwata
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Japan
| | - Satyen Saha
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
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Reiss GJ. Halogen and hydrogen bonding in the layered crystal structure of 2-iodoanilinium triiodide, C6H7I4N. Z KRIST-NEW CRYST ST 2019. [DOI: 10.1515/ncrs-2019-0127] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractC6H7I4N, monoclinic, P21/m (no. 11), a = 9.2818(2) Å, b = 6.55289(16) Å, c = 11.0561(3) Å, β = 114.051(3)°, V = 614.08(3) Å3, Z = 2, Rgt(F) = 0.0180, wRref(F2) = 0.0367, T = 109(2) K.
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Affiliation(s)
- Guido J. Reiss
- Institut für Anorganische Chemie und Strukturchemie, Lehrstuhl II: Material- und Strukturforschung, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany, e-mail:
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Faria LFO, Nobrega MM, Falsini N, Fanetti S, Temperini MLA, Bini R, Ribeiro MCC. Structure and Reactivity of the Ionic Liquid 1-Allyl-3-methylimidazolium Iodide under High Pressure. J Phys Chem B 2019; 123:1822-1830. [PMID: 30730744 DOI: 10.1021/acs.jpcb.8b10669] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Poly(ionic liquid)s are an interesting class of compounds because of their unique chemical and physical properties gathering the characteristics of ionic liquids and polymers. Pressure and temperature have been demonstrated to be alternative parameters to obtain polymers from monomeric species using only physical tools. In this work, we investigate the reaction under high pressure and room temperature of the ionic liquid 1-allyl-3-methylimidazolium iodide by using the diamond anvil cell technique in combination with synchrotron X-ray diffraction and electronic and vibrational spectroscopies. The results indicate a chemical reaction happening through the terminal double bond of the allyl group both in crystalline and glassy phases with the onset of the reaction around ∼7 GPa. Vibrational spectra present evidence for an oligomerization reaction in both the phases. The reaction occurring both in glassy and crystal phases indicates a mechanism not driven by collective motions and likely related to local topological arrangements. The results presented herein extend our understanding of ionic liquid instability boundaries under high pressure and contribute to the development of alternative synthetic routes to achieve poly(ionic liquids).
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Affiliation(s)
- Luiz F O Faria
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , Av. Prof. Lineu Prestes 748 , 05508-000 São Paulo , Brazil
| | - Marcelo M Nobrega
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , Av. Prof. Lineu Prestes 748 , 05508-000 São Paulo , Brazil.,LENS, European Laboratory for Nonlinear Spectroscopy , Via Nello Carrara 1 , 50019 Florence , Sesto Fiorentino, Italy
| | - Naomi Falsini
- LENS, European Laboratory for Nonlinear Spectroscopy , Via Nello Carrara 1 , 50019 Florence , Sesto Fiorentino, Italy
| | - Samuele Fanetti
- LENS, European Laboratory for Nonlinear Spectroscopy , Via Nello Carrara 1 , 50019 Florence , Sesto Fiorentino, Italy.,Dipartimento di Chimica"Ugo Schiff"dell'Università degli Studi di Firenze , Via della Lastruccia 3 , 50019 Florence , Sesto Fiorentino, Italy
| | - Marcia L A Temperini
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , Av. Prof. Lineu Prestes 748 , 05508-000 São Paulo , Brazil
| | - Roberto Bini
- LENS, European Laboratory for Nonlinear Spectroscopy , Via Nello Carrara 1 , 50019 Florence , Sesto Fiorentino, Italy.,Dipartimento di Chimica"Ugo Schiff"dell'Università degli Studi di Firenze , Via della Lastruccia 3 , 50019 Florence , Sesto Fiorentino, Italy
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , Av. Prof. Lineu Prestes 748 , 05508-000 São Paulo , Brazil
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