1
|
Xiong X, Hu Y. Infrared Spectroscopy of Neutral and Cationic Benzonitrile-Methanol Binary Clusters in Supersonic Jets. Molecules 2024; 29:2744. [PMID: 38930810 PMCID: PMC11206090 DOI: 10.3390/molecules29122744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 06/01/2024] [Accepted: 06/05/2024] [Indexed: 06/28/2024] Open
Abstract
The formation of nitrogen-containing organic interstellar molecules is of great importance to reveal chemical processes and the origin of life on Earth. Benzonitrile (BN) is one of the simplest nitrogen-containing aromatic molecules in the interstellar medium (ISM) that has been detected in recent years. Methanol (CH3OH) exists widely in interstellar space with high reactivity. Herein, we measured the infrared (IR) spectra of neutral and cationic BN-CH3OH clusters by vacuum ultraviolet (VUV) photoionization combined with time-of-flight mass spectrometry. Combining IR spectra with the density functional theory calculations, we reveal that the BN-CH3OH intends to form a cyclic H-bonded structure in neutral clusters. However, after the ionization of BN-CH3OH clusters, proton-shared N···H···O and N···H···C structures are confirmed to form between BN and CH3OH, with the minor coexistence of H-bond and O-π structures. The formation of the proton-shared structure expands our knowledge of the evolution of the life-related nitrogen-containing molecules in the universe and provides a possible pathway to the further study of biorelevant aromatic organic macromolecules.
Collapse
Affiliation(s)
| | - Yongjun Hu
- MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| |
Collapse
|
2
|
Palotás J, Daly FC, Douglas-Walker TE, Campbell EK. Mid-infrared spectroscopy of 1-cyanonaphthalene cation for astrochemical consideration. Phys Chem Chem Phys 2024; 26:4111-4117. [PMID: 38226631 DOI: 10.1039/d3cp05784d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
We present the low temperature gas-phase vibrational spectrum of ionised 1-cyanonaphthalene (1-CNN+) in the mid-infrared region. Experimentally, 1-CNN+ ions are cooled below 10 K in a cryogenic ion trapping apparatus, tagged with He atoms and probed with tuneable radiation. Quantum-chemical calculations are carried out at a density functional theory level. The spectrum is dominated by the CN-stretch at 4.516 μm, with weaker CH modes near 3.2 μm.
Collapse
Affiliation(s)
- Julianna Palotás
- School of Chemistry, University of Edinburgh, Joseph Black Building, Kings Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
| | - Francis C Daly
- School of Chemistry, University of Edinburgh, Joseph Black Building, Kings Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
| | - Thomas E Douglas-Walker
- School of Chemistry, University of Edinburgh, Joseph Black Building, Kings Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
| | - Ewen K Campbell
- School of Chemistry, University of Edinburgh, Joseph Black Building, Kings Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK.
| |
Collapse
|
3
|
Arildii D, Matsumoto Y, Dopfer O. Microhydration of the Pyrrole Cation (Py +) Revealed by IR Spectroscopy: Ionization-Induced Rearrangement of the Hydrogen-Bonded Network of Py +(H 2O) 2. J Phys Chem A 2023; 127:2523-2535. [PMID: 36898005 DOI: 10.1021/acs.jpca.3c00363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Microhydration of heterocyclic aromatic molecules can be an appropriate fundamental model to shed light on intermolecular interactions and functions of macromolecules and biomolecules. We characterize herein the microhydration process of the pyrrole cation (Py+) by infrared photodissociation (IRPD) spectroscopy and dispersion-corrected density functional theory calculations (B3LYP-D3/aug-cc-pVTZ). Analysis of IRPD spectra of mass-selected Py+(H2O)2 and its cold Ar-tagged cluster in the NH and OH stretch range combined with geometric parameters of intermolecular structures, binding energies, and natural atomic charge distribution provides a clear picture of the growth of the hydration shell and cooperativity effects. Py+(H2O)2 is formed by stepwise hydration of the acidic NH group of Py+ by a hydrogen-bonded (H2O)2 chain with NH···OH···OH configuration. In this linear H-bonded hydration chain, strong cooperativity, mainly arising from the positive charge, strengthens both the NH···O and OH···O H-bonds with respect to those of Py+H2O and (H2O)2, respectively. The linear chain structure of the Py+(H2O)2 cation is discussed in terms of the ionization-induced rearrangement of the hydration shell of the neutral Py(H2O)2 global minimum characterized by the so-called "σ-π bridge structure" featuring a cyclic NH···OH···OH···π H-bonded network. Emission of the π electron from Py by ionization generates a repulsive interaction between the positive π site of Py+ and the π-bonded OH hydrogen of (H2O)2, thereby breaking this OH···π hydrogen bond and driving the hydration structure toward the linear chain motif of the global minimum on the cation potential.
Collapse
Affiliation(s)
- Dashjargal Arildii
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany
| | - Yoshiteru Matsumoto
- Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany
- International Research Frontiers Initiative, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| |
Collapse
|
4
|
George MAR, Dopfer O. Microhydrated clusters of a pharmaceutical drug: infrared spectra and structures of amantadineH +(H 2O) n. Phys Chem Chem Phys 2023; 25:5529-5549. [PMID: 36723361 DOI: 10.1039/d2cp04556g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Solvation of pharmaceutical drugs has an important effect on their structure and function. Analysis of infrared photodissociation spectra of amantadineH+(H2O)n=1-4 clusters in the sensitive OH, NH, and CH stretch range by quantum chemical calculations (B3LYP-D3/cc-pVTZ) provides a first impression of the interaction of this pharmaceutically active cation with water at the molecular level. The size-dependent frequency shifts reveal detailed information about the acidity of the protons of the NH3+ group of N-protonated amantadineH+ (AmaH+) and the strength of the NH⋯O and OH⋯O hydrogen bonds (H-bonds) of the hydration network. The preferred cluster growth begins with sequential hydration of the NH3+ group by NH⋯O ionic H-bonds (n = 1-3), followed by the extension of the solvent network through OH⋯O H-bonds. However, smaller populations of cluster isomers with an H-bonded solvent network and free N-H bonds are already observed for n ≥ 2, indicating the subtle competition between noncooperative ion hydration and cooperative H-bonding. Interestingly, cyclic water ring structures are identified for n ≥ 3, each with two NH⋯O and two OH⋯O H-bonds. Despite the increasing destabilization of the N-H proton donor bonds upon gradual hydration, no proton transfer to the (H2O)n solvent cluster is observed up to n = 4. In addition to ammonium cluster ions, a small population of microhydrated iminium isomers is also detected, which is substantially lower for the hydrophilic H2O than for the hydrophobic Ar environment.
Collapse
Affiliation(s)
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany.
| |
Collapse
|
5
|
Mason KA, Pearcy AC, Christensen ZA, Attah IK, Meot-Ner Mautner M, El-Shall MS. Water-Assisted Proton Transfer in the Sequential Hydration of Benzonitrile Radical Cation C 6H 5CN •+(H 2O) n: Transition to Hydrated Distonic Cation •C 6H 4CNH +(H 2O) n with n ≥ 4. J Am Chem Soc 2022; 144:9684-9694. [PMID: 35609235 DOI: 10.1021/jacs.2c01143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stepwise hydration of the benzonitrile•+ radical cation with one-seven H2O molecules was investigated experimentally and computationally with density functional theory in C6H5CN•+(H2O)n clusters. The stepwise binding energies (ΔHn-1,n°) were determined by equilibrium measurements for C6H5CN•+(H2O) and for •C6H4CNH+(H2O)n with n = 5, 6, and 7 to be 8.8 and 11.3, 11.0, and 10.0 kcal/mol, respectively. The populations of n = 2 and 3 of the C6H5CN•+(H2O)n clusters were observed only in trace abundance due to fast depletion processes leading to the formation of the hydrated distonic cations •C6H4CNH+(H2O)n with n = 4-7. The observed transition occurs between conventional radical cations hydrated on the ring in C6H5CN•+(H2O)n clusters with n = 1-3 and the protonated radical •C6H4CNH+ (distonic ion) formed by a proton transfer to the CN nitrogen and ionic hydrogen bonding to water molecules in •C6H4CNH+(H2O)n clusters with n = 4-7. The measured binding energy of the hydrated ion C6H5CN•+(H2O) (8.8 kcal/mol) is similar to that of the hydrated benzene radical cation (8.5 kcal/mol) that involves a relatively weak CHδ+···O hydrogen bonding interaction. Also, the measured binding energies of the •C6H4CNH+(H2O)n clusters with n = 5-7 are similar to those of the protonated benzonitrile (methanol)n clusters [C6H5CNH+(CH3OH)n, n = 5-7] that involve CNH+···O ionic hydrogen bonds. The proton shift from the para-•C ring carbon to the nitrogen of the benzonitrile radical cation is endothermic without solvent but thermoneutral for n = 1 and exothermic for n = 2-4 in C6H5CN•+(H2O)n clusters to form the distonic •C6H4CN···H+(OH2)n clusters. The distonic clusters •C6H4CN···H+(OH2)n constitute a new class of structures in radical ion/solvent clusters.
Collapse
Affiliation(s)
- Kyle A Mason
- Department of Chemistry, Virginia Commonwealth University, Richmond 23284-2006 Virginia, United States
| | - Adam C Pearcy
- Department of Chemistry, Virginia Commonwealth University, Richmond 23284-2006 Virginia, United States
| | - Zachary A Christensen
- Department of Chemistry, Virginia Commonwealth University, Richmond 23284-2006 Virginia, United States
| | - Isaac K Attah
- Department of Chemistry, Virginia Commonwealth University, Richmond 23284-2006 Virginia, United States
| | - Michael Meot-Ner Mautner
- Department of Chemistry, Virginia Commonwealth University, Richmond 23284-2006 Virginia, United States
| | - M Samy El-Shall
- Department of Chemistry, Virginia Commonwealth University, Richmond 23284-2006 Virginia, United States
| |
Collapse
|
6
|
Simbizi R, Nduwimana D, Niyoncuti J, Cishahayo P, Gahungu G. On the formation of 2- and 3-cyanofurans and their protonated forms in interstellar medium conditions: quantum chemical evidence. RSC Adv 2022; 12:25332-25341. [PMID: 36199317 PMCID: PMC9446509 DOI: 10.1039/d2ra04351c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 08/23/2022] [Indexed: 11/21/2022] Open
Abstract
The literature is still poor in theoretical and experimental, including both spectroscopic and thermodynamic data for protonated furan and protonated 2-cyanofuran and 3-cyanofuran (FH+, 2CFH+ and 3CFH+). These data are, however, crucial for astrophysicists and astrochemists in the detection of new species in interstellar medium (ISM), the discovery of these molecular species being not yet reported. It is in this perspective that a computational study based on quantum chemistry on FH+, 2CFH+ and 3CFH+ was undertaken. A series of properties including the proton affinity (PA) of furan and the two cyanofurans, the variations of enthalpy (ΔrH), entropy (ΔrS), and Gibbs free energy (ΔrG) for the reactions yielding cyanofurans (neutral and protonated forms), were studied at different temperatures (5 K, 10 K, 150 K and 298 K) and pressures (P = 1 atm and P = 10−5 atm) based on modern computational models (G2MP2, G3, G4MP2 and G4). While confirming that the protonation favors the α-position for furan, the PA values show that the protonation favors the nitrogen atom in cases of 2CFH+ and 3CFH+. The ΔrH, ΔrS and ΔrG values revealed spontaneous reactions producing these species under ISM conditions of temperature and pressure. In addition quadrupole hyperfine structures and vibrational spectra which are essential tools for the characterization and the identification of interstellar molecular species are predicted, while the region where brightest lines fall for different temperatures is discussed. The results reported in this work are expected to assist astrophysicists and astrochemists, in the search for new chemical species in interstellar environments. The literature is still poor in theoretical and experimental, including both spectroscopic and thermodynamic, data for protonated furan and protonated 2-cyanofuran and 3-cyanofuran (FH+, 2CFH+ and 3CFH+).![]()
Collapse
Affiliation(s)
- René Simbizi
- Faculté des Sciences, Département de Physique, Université du Burundi, BP 2700 Bujumbura, Burundi
- Faculté des Sciences, Centre de Recherche en Mathématique & Physique (CRMP), Université du Burundi, BP 2700 Bujumbura, Burundi
| | - Désiré Nduwimana
- Faculté des Sciences, Département de Physique, Université du Burundi, BP 2700 Bujumbura, Burundi
- Faculté des Sciences, Centre de Recherche en Mathématique & Physique (CRMP), Université du Burundi, BP 2700 Bujumbura, Burundi
| | - Joël Niyoncuti
- Faculté des Sciences, Département de Physique, Université du Burundi, BP 2700 Bujumbura, Burundi
- Faculté des Sciences, Centre de Recherche en Mathématique & Physique (CRMP), Université du Burundi, BP 2700 Bujumbura, Burundi
| | - Prosper Cishahayo
- Faculté des Sciences, Département de Chimie, Université du Burundi, BP 2700 Bujumbura, Burundi
- Faculté des Sciences, Centre de Recherche en Sciences Naturelles et Environnementales (CRSNE), Université du Burundi, BP 2700 Bujumbura, Burundi
| | - Godefroid Gahungu
- Faculté des Sciences, Département de Chimie, Université du Burundi, BP 2700 Bujumbura, Burundi
- Faculté des Sciences, Centre de Recherche en Sciences Naturelles et Environnementales (CRSNE), Université du Burundi, BP 2700 Bujumbura, Burundi
| |
Collapse
|
7
|
Khatri J, Roy TK, Chatterjee K, Schwaab G, Havenith M. Vibrational Spectroscopy of Benzonitrile-(Water) 1-2 Clusters in Helium Droplets. J Phys Chem A 2021; 125:6954-6963. [PMID: 34355893 DOI: 10.1021/acs.jpca.1c04553] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Polycyclic aromatic hydrocarbons are considered as primary carriers of the unidentified interstellar bands. The recent discovery of the first interstellar aromatic molecule, benzonitrile (C6H5CN), suggests a repository of aromatic hydrocarbons in the outer earth environment. Herein, we report an infrared (IR) study of benzonitrile-(D2O)n clusters using mass-selective detection in helium nanodroplets. In this work, we use isotopically substituted water, D2O, instead of H2O because of our restricted IR frequency range (2565-3100 cm-1). A comparison of the experimental and predicted spectra computed at the MP2/6-311++G(d,p) level of benzonitrile-(water)1-2 clusters reveals the formation of a unique local minimum structure, which was not detected in previous gas-phase molecular beam experiments. Here, the solvent water forms a nearly linear hydrogen bond (H-bond) with the nitrile nitrogen of benzonitrile, while the previously reported most stable cyclic H-bonded isomer is not observed. This can be rationalized by the stepwise aggregation process of precooled monomers. The addition of a second water molecule results in the formation of two different isomers. In one of the observed isomers, a H-bonded water chain binds linearly to the nitrile nitrogen similar to the monohydrated benzonitrile-water complex. In the other observed isomer, the water dimer forms a ring-type structure, where a H-bonded water dimer simultaneously interacts with the nitrile nitrogen and the adjacent ortho CH group. Finally, we compare the water-binding motif in the neutral benzonitrile-water complex with the corresponding positively and negatively charged benzonitrile-water monohydrates to comprehend the charge-induced alteration of the solvent binding motif.
Collapse
Affiliation(s)
- Jai Khatri
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Tarun Kumar Roy
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Kuntal Chatterjee
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Gerhard Schwaab
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Martina Havenith
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| |
Collapse
|
8
|
George MAR, Buttenberg F, Förstel M, Dopfer O. Microhydration of substituted diamondoid radical cations of biological relevance: infrared spectra of amantadine +-(H 2O) n = 1-3 clusters. Phys Chem Chem Phys 2020; 22:28123-28139. [PMID: 33290468 DOI: 10.1039/d0cp05299j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Hydration of biomolecules and pharmaceutical compounds has a strong impact on their structure, reactivity, and function. Herein, we explore the microhydration structure around the radical cation of the widespread pharmaceutical drug amantadine (C16H15NH2, Ama) by infrared photodissociation (IRPD) spectroscopy of mass-selected Ama+Wn = 1-3 clusters (W = H2O) recorded in the NH, CH, and OH stretch range of the cation ground electronic state. Analysis of the size-dependent frequency shifts by dispersion-corrected density functional theory calculations (B3LYP-D3/cc-pVTZ) provides detailed information about the acidity of the protons of the NH2 group of Ama+ and the structure and strength of the NHO and OHO hydrogen bonds (H-bonds) of the hydration network. The preferred sequential cluster growth begins with hydration of the two acidic NH protons of the NH2 group (n = 1-2) and continues with an extension of the H-bonded hydration network by forming an OHO H-bond of the third W to one ligand in the first hydration subshell (n = 3), like in the W2 dimer. For n = 2, a minor population corresponds to Ama+W2 structures with a W2 unit attached to Ama+via a NHW2 H-bond. Although the N-H proton donor bonds are progressively destabilized by gradual microhydration, no proton transfer to the Wn solvent cluster is observed in the investigated size range (n ≤ 3). Besides the microhydration structure, we also obtain a first impression of the structure and IR spectrum of bare Ama+, as well as the effects of both ionization and hydration on the structure of the adamantyl cage. Comparison of Ama+ with aliphatic and aromatic primary amine radical cations reveals differences in the acidity of the NH2 group and the resulting interaction with W caused by substitution of the cycloalkyl cage.
Collapse
|
9
|
Simbizi R, Gahungu G, Nguyen MT. Theoretical investigation of protonated thiophene and two of its nitrile substituted derivatives (2-cyanothiophene and 3-cyanothiophene). Phys Chem Chem Phys 2020; 22:24735-24743. [PMID: 33107518 DOI: 10.1039/d0cp03154b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theoretical and experimental spectroscopic data for protonated cyano-thiophenes (R-CNH+ with R = C4H3S), which are needed for their interstellar search and/or detection, are still lacking in the literature. Considering the high abundance and reactivity of H3+ in the interstellar medium (ISM), a quantum chemical investigation on protonated thiophene and two of its nitrile-substituted derivatives (2-cyanothiophene and 3-cyanothiophene) is undertaken for their characterization. The geometrical structures for the title species are calculated at the M06-2X/6-31G(d,p) level of theory, followed by an empirical correction for systematic errors. At the same level of theory, IR and Raman spectra are explored and the rotational parameters are calculated. The proton affinity (PA) of R-CN and the enthalpy, entropy and Gibbs free energy changes (ΔrH, ΔrS and ΔrG) of the reactions producing R-CNH+ are computed at the G2(MP2) and G3B3 levels of theory and at different temperatures. The PA calculations show that the protonation favors the nitrogen atom, while ΔrH, ΔrS, and ΔrG reveal the spontaneous reactions producing R-CNH+ and their neutral forms. In addition, quadrupole hyperfine structures are predicted, while the region where the brightest lines fall at different temperatures is discussed. These results are expected to assist astrophysicists and astrochemists in the search for new species in the ISM.
Collapse
Affiliation(s)
- René Simbizi
- Département de Physique, Faculté des Sciences Université du Burundi, B.P. 2700 Bujumbura, Burundi.
| | | | | |
Collapse
|
10
|
Chatterjee K, Dopfer O. Spectroscopic identification of fragment ions of DNA/RNA building blocks: the case of pyrimidine. Phys Chem Chem Phys 2020; 22:17275-17290. [PMID: 32685941 DOI: 10.1039/d0cp02919j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Pyrimidine (Pym, 1,3-diazine, 1,3-diazabenzene) is an important N-heterocyclic building block of nucleobases. Understanding the structures of its fragment and precursor ions provides insight into its prebiotic and abiotic synthetic route. The long-standing controversial debate about the structures of the primary fragment ions of the Pym+ cation (C4H4N2+, m/z 80) resulting from loss of HCN, C3H3N+ (m/z 53), is closed herein with the aid of a combined approach utilizing infrared photodissociation (IRPD) spectroscopy in the CH and NH stretch ranges (νCH/NH) and density functional theory (DFT) calculations. IRPD spectra of cold Ar/N2-tagged fragment ions reveal that the C3H3N+ population is dominated by cis-/trans-HCCHNCH+ ions (∼90%) along with a minor contribution of the most stable H2CCCNH+ and cis-/trans-HCCHCNH+ isomers (∼10%). We also spectroscopically confirm that the secondary fragment resulting from further loss of HCN, C2H2+ (m/z 26), is the acetylene cation (HCCH+). The spectroscopic characterization of the identified C3H3N+ isomers and their hydrogen-bonded dimers with Ar and N2 provides insight into the acidity of their CH and NH groups. Finally, the vibrational properties of Pym+ in the 3 μm range are probed by IRPD of Pym+-(N2)1-2 clusters, which shows a high π-binding affinity of Pym+ toward a nonpolar hydrophobic ligand. Its νCH spectrum confirms the different acidity of the three nonequivalent CH groups.
Collapse
Affiliation(s)
- Kuntal Chatterjee
- Institut für Optik und Atomare Physik, TU Berlin, Hardenbergstr. 36, 10623 Berlin, Germany.
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, TU Berlin, Hardenbergstr. 36, 10623 Berlin, Germany.
| |
Collapse
|
11
|
Chatterjee K, Dopfer O. Protonation of Naphthalene–(Water)n Nanoclusters: Intracluster Proton Transfer to Hydration Shell Revealed by Infrared Photodissociation Spectroscopy. J Phys Chem A 2020; 124:1134-1151. [DOI: 10.1021/acs.jpca.9b11779] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kuntal Chatterjee
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany
| |
Collapse
|
12
|
Chatterjee K, Matsumoto Y, Dopfer O. Aromatic Charge Resonance Interaction Probed by Infrared Spectroscopy. Angew Chem Int Ed Engl 2019; 58:3351-3355. [DOI: 10.1002/anie.201811432] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/22/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Kuntal Chatterjee
- Institut für Optik und Atomare PhysikTechnische Universität Berlin Hardenbergstr. 36 10623 Berlin Germany
| | - Yoshiteru Matsumoto
- Department of ChemistryFaculty of ScienceShizuoka University 836 Ohya, Suruga Shizuoka 422-8529 Japan
| | - Otto Dopfer
- Institut für Optik und Atomare PhysikTechnische Universität Berlin Hardenbergstr. 36 10623 Berlin Germany
| |
Collapse
|
13
|
Chatterjee K, Dopfer O. Intracluster proton transfer in protonated benzonitrile–(H2O)n≤6 nanoclusters: hydrated hydronium core for n ≥ 2. Phys Chem Chem Phys 2019; 21:25226-25246. [DOI: 10.1039/c9cp05042f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Infrared spectroscopy and density functional theory calculations of protonated benzonitrile–(H2O)n clusters reveal proton transfer to solvent for n ≥ 2 and the drastic effects of the aromatic dopant molecule on the network of H+(H2O)n+1.
Collapse
Affiliation(s)
- Kuntal Chatterjee
- Institut für Optik und Atomare Physik
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - Otto Dopfer
- Institut für Optik und Atomare Physik
- Technische Universität Berlin
- 10623 Berlin
- Germany
| |
Collapse
|
14
|
Chatterjee K, Matsumoto Y, Dopfer O. Aromatic Charge Resonance Interaction Probed by Infrared Spectroscopy. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Kuntal Chatterjee
- Institut für Optik und Atomare PhysikTechnische Universität Berlin Hardenbergstr. 36 10623 Berlin Germany
| | - Yoshiteru Matsumoto
- Department of ChemistryFaculty of ScienceShizuoka University 836 Ohya, Suruga Shizuoka 422-8529 Japan
| | - Otto Dopfer
- Institut für Optik und Atomare PhysikTechnische Universität Berlin Hardenbergstr. 36 10623 Berlin Germany
| |
Collapse
|