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Kubo M, Goda R, Muramatsu S, Inokuchi Y. Conformation and Photodissociation Process of Benzo-15-Crown-5 and Benzo-18-Crown-6 Complexes with Ammonium Ions Investigated by Cold UV and IR Spectroscopy in the Gas Phase. J Phys Chem A 2024; 128:7353-7363. [PMID: 39167726 DOI: 10.1021/acs.jpca.4c02121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
We examined the conformation of benzo-15-crown-5 (B15C5) and benzo-18-crown-6 (B18C6) complexes with ammonium ions, NH4+, CH3NH3+ (MeNH3+), CH3CH2NH3+ (EtNH3+), and CH3CH2CH2NH3+ (PrNH3+), using cold UV and IR spectroscopy in the gas phase. We measured the UV photodissociation (UVPD) spectra of the ammonium complexes and compared them with those of the K+(B15C5) and K+(B18C6) complexes in order to identify the conformation on the basis of the band position. The number of possible conformations for the ammonium complexes of B15C5 is limited compared with alkali metal ions with similar ionic radii. The NH4+(B15C5), MeNH3+(B15C5), and EtNH3+(B15C5) complexes show two conformers, whereas the K+(B15C5) complex has three stable conformers. In the case of the PrNH3+(B15C5) complex, one conformer was found predominantly in the UVPD spectrum. The ammonium complexes of B15C5 prefer to adopt crown conformations with large dihedral angles on the C-O-C-C atoms around the benzene moiety. In the case of the ammonium complexes of B18C6, two or three conformers were found in the UVPD spectra. One conformation of the B18C6 complexes is similar to that of the K+(B18C6) complex, which has a planar form on the C-O-C-C atoms around the benzene moiety. The other but dominant conformations of the ammonium complexes could be attributed to those with large C-O-C-C dihedral angles. These conformational findings for the ammonium complexes suggest that the benzo-crown ethers tend to adopt nonplanar conformations around the benzene moiety to encapsulate the ammonium ions. The IR-UV double-resonance (DR) spectra of the B15C5 and B18C6 complexes were compared to those of benzo-12-crown-4 (B12C4) and dibenzo-18-crown-6 (DB18C6) complexes. The N-H···O hydrogen bond (H-bond) is weaker with increasing ring size from B12C4 to B18C6, although the calculated binding energy is smaller for B12C4 than for B18C6. This result indicates that cooperative H-bonds with three N-H groups can strengthen the intermolecular bond between the ammonium ions and B18C6. The difference in the conformational preference between the ammonium and K+ complexes is attributed to directed N-H···O H-bonds in the ammonium complexes. Proton transfer and dissociation of the crown ring were also observed for the photoexcitation of the NH4+(B15C5) and NH4+(B18C6) complexes.
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Affiliation(s)
- Mayuko Kubo
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Ryosuke Goda
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Satoru Muramatsu
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Yoshiya Inokuchi
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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2
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Ito R, Ohshimo K, Misaizu F. Intra-host π-π interactions in crown ether complexes revealed by cryogenic ion mobility-mass spectrometry. Phys Chem Chem Phys 2024; 26:12537-12544. [PMID: 38619106 DOI: 10.1039/d4cp00835a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
Cryogenic ion mobility-mass spectrometry was performed to investigate the relative abundance of conformers of dinaphtho-24-crown-8 (DN24C8) complexes with alkali metal cations M+ (M = Li, Na, K, Rb, and Cs). The "closed" conformers of M+(DN24C8) with short distances between two naphthalene rings in the crown ethers were predominantly observed for all complexes at 86 K. The two noncovalent interactions, host-guest and intra-host interactions, were analyzed separately by density functional theory calculations to reveal the origin of the stability of the closed conformers. As a result, it was revealed that the intra-host π-π interactions have a more critical role in determining the stability of the conformers than the host-guest interactions. The closed conformers of M+(DN24C8) also have wider regions of the π-π interactions than those of the M+(dibenzo-24-crown-8) complexes.
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Affiliation(s)
- Ryosuke Ito
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
| | - Keijiro Ohshimo
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
| | - Fuminori Misaizu
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
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3
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Tureček F. UV-vis spectroscopy of gas-phase ions. MASS SPECTROMETRY REVIEWS 2023; 42:206-226. [PMID: 34392556 DOI: 10.1002/mas.21726] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 06/07/2021] [Accepted: 06/08/2021] [Indexed: 06/13/2023]
Abstract
Photodissociation action spectroscopy has made a great progress in expanding investigations of gas-phase ion structures. This review deals with aspects of gas-phase ion electronic excitations that result in wavelength-dependent dissociation and light emission via fluorescence, chiefly covering the ultraviolet and visible regions of the spectrum. The principles are briefly outlined and a few examples of instrumentation are presented. The main thrust of the review is to collect and selectively present applications of UV-vis action spectroscopy to studies of stable gas-phase ion structures and combinations of spectroscopy with ion mobility, collision-induced dissociation, and ion-ion reactions leading to the generation of reactive intermediates and electronic energy transfer.
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Affiliation(s)
- František Tureček
- Department of Chemistry, University of Washington, Seattle, Washington, USA
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4
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Goda R, Kanazawa S, Machida S, Muramatsu S, Inokuchi Y. Conformation of Benzo-12-Crown-4 Complexes with Ammonium Ions Investigated by Cold Gas-Phase Spectroscopy. J Phys Chem A 2021; 125:10410-10418. [PMID: 34818015 DOI: 10.1021/acs.jpca.1c09091] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, we examined the conformation and intermolecular interactions of benzo-12-crown-4 (B12C4) complexes with NH4+, CH3NH3+ (MeNH3+), CH3CH2NH3+ (EtNH3+), and CH3CH2CH2NH3+ (PrNH3+) using cold gas-phase spectroscopy. All of the B12C4 complexes showed sharp vibronic features in the UV photodissociation spectra, and the position of the 0-0 band was close to that of the B12C4 complex with an isotropic K+ guest. This result suggests that the conformation of B12C4 is maintained despite oriented interactions with ammonium guests via anisotropic N-H···O interactions. Further, we measured the IR-UV double-resonance spectra of these complexes in the NH stretching region. In the IR-UV spectra of the EtNH3+ and PrNH3+ complexes, two distinct IR fingerprints were observed depending on the UV probe wavelength selected, indicating the existence of another (second) conformer for these complexes. Quantum chemical calculations clarified that the second conformer of the EtNH3+ and PrNH3+ complexes was partially stabilized by the C-H···π hydrogen bond. The conformation of B12C4 complexes with ammonium ions is strongly affected by the interaction between the alkyl chain of the ion guest and the benzene ring of the B12C4 host, although the main intermolecular interaction occurs between the NH3+ group and crown cavity through the N-H···O hydrogen bonds.
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Affiliation(s)
- Ryosuke Goda
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Saya Kanazawa
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Shiori Machida
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Satoru Muramatsu
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Yoshiya Inokuchi
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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5
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Tainaka S, Ujihira T, Kubo M, Kida M, Shimoyama D, Muramatsu S, Abe M, Haino T, Ebata T, Misaizu F, Ohshimo K, Inokuchi Y. Conformation of K+(Crown Ether) Complexes Revealed by Ion Mobility–Mass Spectrometry and Ultraviolet Spectroscopy. J Phys Chem A 2020; 124:9980-9990. [DOI: 10.1021/acs.jpca.0c09068] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sota Tainaka
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Tomoyuki Ujihira
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Mayuko Kubo
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Motoki Kida
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Daisuke Shimoyama
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Satoru Muramatsu
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Manabu Abe
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Fuminori Misaizu
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Keijiro Ohshimo
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Yoshiya Inokuchi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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6
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Zhou D, Hao H, Ma Y, Zhong H, Dai Y, Cai K, Mukherjee S, Liu J, Bian H. Specific Host-Guest Interactions in the Crown Ether Complexes with K + and NH 4+ Revealed from the Vibrational Relaxation Dynamics of the Counteranion. J Phys Chem B 2020; 124:9154-9162. [PMID: 32965118 DOI: 10.1021/acs.jpcb.0c07032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The specific host-guest interactions in the corresponding complexes of K+ and NH4+ with typical crown ethers were investigated by using FTIR and ultrafast IR spectroscopies. The counteranions, i.e., SCN-, were employed as a local vibrational probe to report the structural dynamics of the complexation. It was found that the vibrational relaxation dynamics of the SCN- was strongly affected by the cations confined in the cavities of the crown ethers. The time constant of the vibrational population decay of SCN- in the complex of NH4+ with the 18-crown-6 was determined to be 6 ± 2 ps, which is ∼30 times faster than that in the complex of K+ with the crown ethers. Control experiments showed that the vibrational population decay of SCN- depended on the size of the cavities of the crown ethers. A theoretical calculation further indicated that the nitrogen atom of SCN- showed preferential coordination to the K+ ions hosted by the crown ethers, while the NH4+ can form hydrogen bonds with the oxygen atoms in the studied crown ethers. The geometric constraints formed in the complex of crown ethers can cause a specific interaction between the NH4+ and SCN-, which can facilitate the intermolecular vibrational energy redistribution of the SCN-.
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Affiliation(s)
- Dexia Zhou
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Hongxing Hao
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Yinhua Ma
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Hongmei Zhong
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Ya'nan Dai
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Kaicong Cai
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Somnath Mukherjee
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Jing Liu
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Hongtao Bian
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
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7
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Iwai NT, Kramaric M, Crabbe D, Wei Y, Chen R, Shen M. GABA Detection with Nano-ITIES Pipet Electrode: A New Mechanism, Water/DCE-Octanoic Acid Interface. Anal Chem 2018; 90:3067-3072. [PMID: 29388419 PMCID: PMC6126903 DOI: 10.1021/acs.analchem.7b03099] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Interface between two immiscible electrolyte solutions (ITIES) supported on the orifice of a pipet have become a powerful platform to detect a broad range of analytes. We present here the detection of γ-aminobutyric acid (GABA) with the nanoITIES pipet electrodes for the first time. GABA has a net charge of zero in an aqueous solution at pH ≈ 7, and it has not previously been detected at ITIES. In this work, we demonstrated GABA detection at ITIES in an aqueous solution at pH ≈ 7, where we introduced a novel detection strategy based on "pH modulation from the oil phase". To the best of our knowledge, this is the first report of such. Current increases linearly with increasing concentrations of GABA, ranging from 0.25 mM to 1.0 mM. The measured half-wave transfer potential of GABA is -0.401 ± 0.010 V ( n = 22) vs E1/2,TBA. The measured diffusion coefficient for GABA detection at nanoITIES pipet electrode is 6.09 (±0.58) × 10-10 m2/s ( n = 5). Experimental results indicate that protons generated from octanoic acid dissociation in the oil phase do not come out from the oil phase into the aqueous phase; neither were protons produced in the aqueous phase. NanoITIES pipet electrodes with radii of 320-340 nm were used in the current study. This new strategy and knowledge presented here lays the groundwork for the future development of ITIES pipet electrodes, especially for the detection of electrochemically nonredox active analytes.
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Affiliation(s)
- Nicholas Toshio Iwai
- Department of Chemistry, University of Illinois at Urbana–Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Michelle Kramaric
- Department of Chemistry, University of Illinois at Urbana–Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Daniel Crabbe
- Department of Chemistry, University of Illinois at Urbana–Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Yuanyuan Wei
- Department of Chemistry, University of Illinois at Urbana–Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Ran Chen
- Department of Chemistry, University of Illinois at Urbana–Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Mei Shen
- Corresponding Author, Fax: +1 (217) 265-6290.
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8
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Inokuchi Y, Kida M, Ebata T. Geometric and Electronic Structures of Dibenzo-15-Crown-5 Complexes with Alkali Metal Ions Studied by UV Photodissociation and UV–UV Hole-Burning Spectroscopy. J Phys Chem A 2017; 121:954-962. [DOI: 10.1021/acs.jpca.6b09653] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshiya Inokuchi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Motoki Kida
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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9
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Inokuchi Y, Nakatsuma M, Kida M, Ebata T. Conformation of Alkali Metal Ion–Benzo-12-Crown-4 Complexes Investigated by UV Photodissociation and UV–UV Hole-Burning Spectroscopy. J Phys Chem A 2016; 120:6394-401. [DOI: 10.1021/acs.jpca.6b06626] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yoshiya Inokuchi
- Department
of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Maki Nakatsuma
- Department
of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Motoki Kida
- Department
of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- Department
of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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10
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Ebata T, Inokuchi Y. Laser Spectroscopic Study of Cold Gas-Phase Host-Guest Complexes of Crown Ethers. CHEM REC 2016; 16:1034-53. [DOI: 10.1002/tcr.201500287] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Takayuki Ebata
- Department of Chemistry, Graduate School of Science; Hiroshima University; Higashi-Hiroshima 739-8526 Japan
| | - Yoshiya Inokuchi
- Department of Chemistry, Graduate School of Science; Hiroshima University; Higashi-Hiroshima 739-8526 Japan
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11
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Baek JY, Choi CM, Eun HJ, Park KS, Choi MC, Heo J, Kim NJ. Ultraviolet photodissociation spectroscopy of cold, isolated adenine complexes with a potassium cation. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.06.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Inokuchi Y, Soga K, Hirai K, Kida M, Morishima F, Ebata T. Ultraviolet Photodissociation Spectroscopy of the Cold K+·Calix[4]arene Complex in the Gas Phase. J Phys Chem A 2015; 119:8512-8. [DOI: 10.1021/acs.jpca.5b05328] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshiya Inokuchi
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Kazuki Soga
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Kenta Hirai
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Motoki Kida
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Fumiya Morishima
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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13
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Inokuchi Y, Ebata T, Ikeda T, Haino T, Kimura T, Guo H, Furutani Y. New insights into metal ion–crown ether complexes revealed by SEIRA spectroscopy. NEW J CHEM 2015. [DOI: 10.1039/c5nj01787d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate the SEIRA spectroscopy of crown ether complexes for examining the relationship between the guest selectivity, structure, and solvent effect.
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Affiliation(s)
- Yoshiya Inokuchi
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Hiroshima 739-8526
| | - Takayuki Ebata
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Hiroshima 739-8526
| | - Toshiaki Ikeda
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Hiroshima 739-8526
| | - Takeharu Haino
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Hiroshima 739-8526
| | | | - Hao Guo
- Institute for Molecular Science
- Myodaiji
- Japan
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14
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Kang H, Féraud G, Dedonder-Lardeux C, Jouvet C. New Method for Double-Resonance Spectroscopy in a Cold Quadrupole Ion Trap and Its Application to UV-UV Hole-Burning Spectroscopy of Protonated Adenine Dimer. J Phys Chem Lett 2014; 5:2760-2764. [PMID: 26277976 DOI: 10.1021/jz5012466] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A novel method for double-resonance spectroscopy in a cold quadrupole ion trap is presented, which utilizes dipolar resonant excitation of fragment ions in the quadrupole ion trap. Photofragments by a burn laser are removed by applying an auxiliary RF to the trap, and a probe laser detects the depletion of photofragments by the burn laser. By scanning the wavelength of the burn laser, conformation-specific UV spectrum of a cold ion is obtained. This simple and powerful method is applicable to any type of double-resonance spectroscopy in a cold quadrupole ion trap and was applied to UV-UV hole-burning spectroscopy of protonated adenine dimer. It was found that protonated adenine dimer has multiple conformers/tautomers, each with multiple excited states with drastically different excited state dynamics.
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Affiliation(s)
- Hyuk Kang
- †Department of Chemistry, Ajou University, San5, Wonchon-dong, Youngtong-gu, Suwon 443-749, Korea
| | - Géraldine Féraud
- ‡CNRS, Aix-Marseille Université, Physique des Interactions Ioniques et Moléculaire (PIIM) UMR 7345, 13397 Marseille Cedex, France
| | - Claude Dedonder-Lardeux
- ‡CNRS, Aix-Marseille Université, Physique des Interactions Ioniques et Moléculaire (PIIM) UMR 7345, 13397 Marseille Cedex, France
| | - Christophe Jouvet
- ‡CNRS, Aix-Marseille Université, Physique des Interactions Ioniques et Moléculaire (PIIM) UMR 7345, 13397 Marseille Cedex, France
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15
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Berdakin M, Féraud G, Dedonder-Lardeux C, Jouvet C, Pino GA. Effect of Ag(+) on the Excited-State Properties of a Gas-Phase (Cytosine)2Ag(+) Complex: Electronic Transition and Estimated Lifetime. J Phys Chem Lett 2014; 5:2295-2301. [PMID: 26279549 DOI: 10.1021/jz5009455] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Recently, DNA molecules have received great attention because of their potential applications in material science. One interesting example is the production of highly fluorescent and tunable DNA-Agn clusters with cytosine (C)-rich DNA strands. Here, we report the UV photofragmentation spectra of gas-phase cytosine···Ag(+)···cytosine (C2Ag(+)) and cytosine···H(+)···cytosine (C2H(+)) complexes together with theoretical calculations. In both cases, the excitation energy does not differ significantly from that of isolated cytosine or protonated cytosine, indicating that the excitation takes place on the DNA base. However, the excited-state lifetime of the C2H(+) (τ = 85 fs), estimated from the bandwidth of the spectrum, is at least 2 orders of magnitude shorter than that of the C2Ag(+) (τ > 5000 fs). The increased excited-state lifetime upon silver complexation is quite unexpected, and it clearly opens the question about what factors are controlling the nonradiative decay in pyrimidine DNA bases. This is an important result for the expanding field of metal-mediated base pairing and may also be important to the photophysical properties of DNA-templated fluorescent silver clusters.
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Affiliation(s)
- Matias Berdakin
- †INFIQC (CONICET - UNC), Departamento de Fisicoquı́mica, Facultad de Ciencias Quı́micas, Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Géraldine Féraud
- ‡Physique des Interactions Ioniques et Moléculaires (PIIM), CNRS, Aix Marseille Université: UMR-7345, 13397 Marseille, France
| | - Claude Dedonder-Lardeux
- ‡Physique des Interactions Ioniques et Moléculaires (PIIM), CNRS, Aix Marseille Université: UMR-7345, 13397 Marseille, France
| | - Christophe Jouvet
- ‡Physique des Interactions Ioniques et Moléculaires (PIIM), CNRS, Aix Marseille Université: UMR-7345, 13397 Marseille, France
| | - Gustavo A Pino
- †INFIQC (CONICET - UNC), Departamento de Fisicoquı́mica, Facultad de Ciencias Quı́micas, Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina
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16
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Féraud G, Dedonder C, Jouvet C, Inokuchi Y, Haino T, Sekiya R, Ebata T. Development of Ultraviolet-Ultraviolet Hole-Burning Spectroscopy for Cold Gas-Phase Ions. J Phys Chem Lett 2014; 5:1236-1240. [PMID: 26274477 DOI: 10.1021/jz500478w] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new ultraviolet-ultraviolet hole-burning (UV-UV HB) spectroscopic scheme has been developed for cold gas-phase ions in a quadrupole ion trap (QIT) connected with a time-of-flight (TOF) mass spectrometer. In this method, a pump UV laser generates a population hole for the ions trapped in the cold QIT, and a second UV laser (probe) monitors the population hole for the ions extracted to the field-free region of the TOF mass spectrometer. Here, the neutral fragments generated by the UV dissociation of the ions with the second laser are detected. This UV-UV HB spectroscopy was applied to protonated dibenzylamine and to protonated uracil. Protonated uracil exhibits two strong electronic transitions; one has a band origin at 31760 cm(-1) and the other at 39000 cm(-1). From the UV-UV HB measurement and quantum chemical calculations, the lower-energy transition is assigned to the enol-keto tautomer and the higher-energy one to the enol-enol tautomer.
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Affiliation(s)
- Géraldine Féraud
- †Physique des Interactions Ioniques et Moleculaires (PIIM) UMR 7345, CNRS, Aix Marseille Université, 13397 Marseille Cedex, France
| | - Claude Dedonder
- †Physique des Interactions Ioniques et Moleculaires (PIIM) UMR 7345, CNRS, Aix Marseille Université, 13397 Marseille Cedex, France
| | - Christophe Jouvet
- †Physique des Interactions Ioniques et Moleculaires (PIIM) UMR 7345, CNRS, Aix Marseille Université, 13397 Marseille Cedex, France
| | - Yoshiya Inokuchi
- ‡Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Takeharu Haino
- ‡Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Ryo Sekiya
- ‡Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- ‡Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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17
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Choi CM, Baek JY, Park KS, Heo J, Kim NJ. Conformation-specific ultraviolet spectroscopy of benzo-18-crown-6 complexes with a potassium cation. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Inokuchi Y, Ebata T, Rizzo TR, Boyarkin OV. Microhydration Effects on the Encapsulation of Potassium Ion by Dibenzo-18-Crown-6. J Am Chem Soc 2014; 136:1815-24. [DOI: 10.1021/ja4086066] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yoshiya Inokuchi
- Department
of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima,
Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- Department
of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima,
Hiroshima 739-8526, Japan
| | - Thomas R. Rizzo
- Laboratoire
de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - Oleg V. Boyarkin
- Laboratoire
de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
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19
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Berdakin M, Féraud G, Dedonder-Lardeux C, Jouvet C, Pino GA. Excited states of protonated DNA/RNA bases. Phys Chem Chem Phys 2014; 16:10643-50. [DOI: 10.1039/c4cp00742e] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The excited state lifetime of protonated DNA/RNA bases is strongly dependent on the tautomeric form.
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Affiliation(s)
- Matias Berdakin
- INFIQC (CONICET – Universidad Nacional de Córdoba) Dpto. de Fisicoquímica – Facultad de Ciencias Químicas – Centro Láser de Ciencias Moleculares – Universidad Nacional de Córdoba
- Ciudad Universitaria
- X5000HUA Córdoba, Argentina
| | - Géraldine Féraud
- CNRS
- Aix Marseille Université
- Physique des Interactions Ioniques et Moléculaires (PIIM): UMR-7345
- 13397 Marseille, France
| | - Claude Dedonder-Lardeux
- CNRS
- Aix Marseille Université
- Physique des Interactions Ioniques et Moléculaires (PIIM): UMR-7345
- 13397 Marseille, France
| | - Christophe Jouvet
- CNRS
- Aix Marseille Université
- Physique des Interactions Ioniques et Moléculaires (PIIM): UMR-7345
- 13397 Marseille, France
| | - Gustavo A. Pino
- INFIQC (CONICET – Universidad Nacional de Córdoba) Dpto. de Fisicoquímica – Facultad de Ciencias Químicas – Centro Láser de Ciencias Moleculares – Universidad Nacional de Córdoba
- Ciudad Universitaria
- X5000HUA Córdoba, Argentina
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20
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Inokuchi Y, Mizuuchi T, Ebata T, Ikeda T, Haino T, Kimura T, Guo H, Furutani Y. Formation of host–guest complexes on gold surface investigated by surface-enhanced IR absorption spectroscopy. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2013.12.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Kellner ID, Nye LC, von Gernler MS, Li J, Tzirakis MD, Orfanopoulos M, Drewello T. Ion formation pathways of crown ether–fullerene conjugates in the gas phase. Phys Chem Chem Phys 2014; 16:18982-92. [DOI: 10.1039/c4cp02374a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crown ether–fullerene conjugates are studied by ESI and MALDI-MS covering ionisation mechanisms, charge localisation and relative affinity to alkali metal ions.
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Affiliation(s)
- Ina D. Kellner
- Physical Chemistry I
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen, Germany
| | - Leanne C. Nye
- Physical Chemistry I
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen, Germany
| | - Marc S. von Gernler
- Physical Chemistry I
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen, Germany
| | - Jing Li
- Physical Chemistry I
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen, Germany
| | - Manolis D. Tzirakis
- Organic Chemistry
- Department of Chemistry
- University of Crete
- Heraklion, Greece
| | | | - Thomas Drewello
- Physical Chemistry I
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen, Germany
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22
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Li YP, Zhao Q, Yang HR, Liu SJ, Liu XM, Zhang YH, Hu TL, Chen JT, Chang Z, Bu XH. A new ditopic ratiometric receptor for detecting zinc and fluoride ions in living cells. Analyst 2013; 138:5486-94. [PMID: 23894743 DOI: 10.1039/c3an00351e] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The synthesis, characterization and ion binding properties of a new ditopic ratiometric receptor (1), based on 2-(4,5-dihydro-1H-imidazol-2-yl)phenol and crown ether moieties, have been described. The ditopic ratiometric receptor has been studied in sensing both F(-) and Zn(2+) ions, exhibiting different fluorescent colour changes from cyan green to blue/black observable by the naked eye under UV-light. The addition of Zn(2+) to the solution of 1 induced the formation of a 2 : 2 ligand-metal complex 1-Zn(2+), which displays a remarkable blue shift of the emission maxima of 1 from 455 nm to 400 nm due to the inhibition of excited-state intramolecular proton transfer (ESIPT) mechanism. The sensing processes were monitored by fluorescence/absorption titrations, and further confirmed by Job's plot and (1)H NMR titrations. The crystal structure of 1-Zn(2+) reveals that 1 binds Zn(2+) in four-coordinated modes. Furthermore, 1 is cell permeable and may be applied to detect trace Zn(2+) and F(-) during the development of a living organism.
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Affiliation(s)
- Ya-Ping Li
- Department of Chemistry, TKL of Metal and Molecule-based Material Chemistry, Synergetic Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
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23
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Inokuchi Y, Kusaka R, Ebata T, Boyarkin OV, Rizzo TR. Laser Spectroscopic Study of Cold Host–Guest Complexes of Crown Ethers in the Gas Phase. Chemphyschem 2012. [DOI: 10.1002/cphc.201200746] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yoshiya Inokuchi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi‐Hiroshima 739‐8526 (Japan)
| | - Ryoji Kusaka
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi‐Hiroshima 739‐8526 (Japan)
| | - Takayuki Ebata
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi‐Hiroshima 739‐8526 (Japan)
| | - Oleg V. Boyarkin
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne 1015 (Switzerland)
| | - Thomas R. Rizzo
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne 1015 (Switzerland)
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24
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Li YP, Yang HR, Zhao Q, Song WC, Han J, Bu XH. Ratiometric and Selective Fluorescent Sensor for Zn2+ as an “Off–On–Off” Switch and Logic Gate. Inorg Chem 2012; 51:9642-8. [DOI: 10.1021/ic300738e] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ya-Ping Li
- Tianjin Key
Lab on Metal and Molecule-based Material
Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Hua-Rong Yang
- Tianjin Key
Lab on Metal and Molecule-based Material
Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Qiang Zhao
- Tianjin Key
Lab on Metal and Molecule-based Material
Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Wei-Chao Song
- Tianjin Key
Lab on Metal and Molecule-based Material
Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Jie Han
- Tianjin Key
Lab on Metal and Molecule-based Material
Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Xian-He Bu
- Tianjin Key
Lab on Metal and Molecule-based Material
Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
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25
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Choi CM, Heo J, Kim NJ. Binding selectivity of dibenzo-18-crown-6 for alkali metal cations in aqueous solution: A density functional theory study using a continuum solvation model. Chem Cent J 2012; 6:84. [PMID: 22873431 PMCID: PMC3464923 DOI: 10.1186/1752-153x-6-84] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 08/01/2012] [Indexed: 12/02/2022] Open
Abstract
Background Dibenzo-18-crown-6 (DB18C6) exhibits the binding selectivity for alkali metal cations in solution phase. In this study, we investigate the main forces that determine the binding selectivity of DB18C6 for the metal cations in aqueous solution using the density functional theory (DFT) and the conductor-like polarizable continuum model (CPCM). Results The bond dissociation free energies (BDFE) of DB18C6 complexes with alkali metal cations (M+-DB18C6, M = Li, Na, K, Rb, and Cs) in aqueous solution are calculated at the B3LYP/6-311++G(d,p)//B3LYP/6-31 + G(d) level using the CPCM. It is found that the theoretical BDFE is the largest for K+-DB18C6 and decreases as the size of the metal cation gets larger or smaller than that of K+, which agrees well with previous experimental results. Conclusion The solvation energy of M+-DB18C6 in aqueous solution plays a key role in determining the binding selectivity of DB18C6. In particular, the non-electrostatic dispersion interaction between the solute and solvent, which depends strongly on the complex structure, is largely responsible for the different solvation energies of M+-DB18C6. This study shows that the implicit solvation model like the CPCM works reasonably well in predicting the binding selectivity of DB18C6 in aqueous solution.
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Affiliation(s)
- Chang Min Choi
- Department of Chemistry, Chungbuk National University, Chungbuk, 361-763, South Korea.
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26
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Choi CM, Choi DH, Heo J, Kim NJ, Kim SK. Ultraviolet-Ultraviolet Hole Burning Spectroscopy in a Quadrupole Ion Trap: Dibenzo[18]crown-6 Complexes with Alkali Metal Cations. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201202640] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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27
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Choi CM, Choi DH, Heo J, Kim NJ, Kim SK. Ultraviolet-Ultraviolet Hole Burning Spectroscopy in a Quadrupole Ion Trap: Dibenzo[18]crown-6 Complexes with Alkali Metal Cations. Angew Chem Int Ed Engl 2012; 51:7297-300. [DOI: 10.1002/anie.201202640] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Indexed: 11/11/2022]
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28
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Inokuchi Y, Boyarkin OV, Kusaka R, Haino T, Ebata T, Rizzo TR. Ion Selectivity of Crown Ethers Investigated by UV and IR Spectroscopy in a Cold Ion Trap. J Phys Chem A 2012; 116:4057-68. [DOI: 10.1021/jp3011519] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yoshiya Inokuchi
- Department of Chemistry, Graduate
School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Oleg V. Boyarkin
- Laboratoire de Chimie Physique
Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - Ryoji Kusaka
- Department of Chemistry, Graduate
School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate
School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- Department of Chemistry, Graduate
School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Thomas R. Rizzo
- Laboratoire de Chimie Physique
Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
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29
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Inokuchi Y, Boyarkin OV, Kusaka R, Haino T, Ebata T, Rizzo TR. UV and IR Spectroscopic Studies of Cold Alkali Metal Ion–Crown Ether Complexes in the Gas Phase. J Am Chem Soc 2011; 133:12256-63. [DOI: 10.1021/ja2046205] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yoshiya Inokuchi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Oleg V. Boyarkin
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - Ryoji Kusaka
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takayuki Ebata
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Thomas R. Rizzo
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
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30
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Choi CM, Lee JH, Choi YH, Kim HJ, Kim NJ, Heo J. Ultraviolet photodepletion spectroscopy of dibenzo-18-crown-6-ether complexes with alkaline Earth metal divalent cations. J Phys Chem A 2011; 114:11167-74. [PMID: 20961155 DOI: 10.1021/jp1027299] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Ultraviolet photodepletion spectra of dibenzo-18-crown-6-ether complexes with alkaline earth metal divalent cations (A(2+)-DB18C6, A = Ba, Sr, Ca, and Mg) were obtained in the gas phase using electrospray ionization quadrupole ion-trap reflectron time-of-flight mass spectrometry. Each spectrum exhibits the lowest energy absorption band in the wavenumber region of 35 400-37 800 cm(-1), which is tentatively assigned as the origin of the S(0)-S(1) transition of A(2+)-DB18C6. This origin band shows a red shift as the size of the metal dication increases from Mg(2+) to Ba(2+). The binding energies of the metal dications to DB18C6 at the S(0) state were calculated at the lowest energy structures optimized by the density functional theory and employed with the experimental energies of the origin bands to estimate the binding energies at the S(1) state. We suggest that the red shifts of the origin bands arise from the decrease in the binding energies of the metal dications at the S(1) state by nearly constant ratios with respect to the binding energies at the S(0) state, which decrease with increasing size of the metal dication. This unique relationship of the binding energies between the S(0) and S(1) states gives rise to a linear correlation between the relative shift of the origin band of A(2+)-DB18C6 and the binding energy of the metal dication at the S(0) state. The size effects of the metal cations on the properties of metal-DB18C6 complex ions are also manifested in the linear plot of the relative shift of the origin band as a function of the size to charge ratio of the metal cations, where the shifts of the origin bands for all DB18C6 complexes with alkali and alkaline earth metal cations are fit to the same line.
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Affiliation(s)
- Chang Min Choi
- Department of Chemistry, Chungbuk National University, Chungbuk 361-763, Korea
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31
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Choi CM, Heo J, Park CJ, Kim NJ. Theoretical calculations for mass resolution of a quadrupole ion trap reflectron time-of-flight mass spectrometer. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2010; 24:422-428. [PMID: 20069692 DOI: 10.1002/rcm.4413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have developed a theoretical method of predicting the mass resolution for a quadrupole ion trap reflectron time-of-flight (QIT-reTOF) mass spectrometer as a function of the spatial and velocity distributions of ions, voltages applied to the electrodes, and dimensions of the instrument. The flight times of ions were calculated using theoretical equations derived with an assumption of uniform electric fields inside the QIT and with the analytical description of the potential including the monopole, dipole, and quadrupole components. The mass resolution was then estimated from the flight-time spread of the ions with finite spatial and velocity distributions inside the QIT. The feasibility of the theoretical method was confirmed by the reasonable agreement of the theoretical resolution with the experimental one measured by varying the extraction voltage of the QIT or the deceleration voltage of the reflectron. We found that the theoretical resolution estimated with the assumption of the uniform electric fields inside the QIT reproduced the experimental one better than that with the analytical description of the potential. The possible applications of this theoretical method include the optimization of the experimental parameters of a given QIT-reTOF mass spectrometer and the design of new instruments with higher mass resolution.
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Affiliation(s)
- Chang Min Choi
- Department of Chemistry, Chungbuk National University, Chungbuk 361-763, Korea
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