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Knochenmuss R, Sinha RK, Leutwyler S. Intermolecular dissociation energies of dispersively bound complexes of aromatics with noble gases and nitrogen. J Chem Phys 2018; 148:134302. [DOI: 10.1063/1.5019432] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Richard Knochenmuss
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Rajeev K. Sinha
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Samuel Leutwyler
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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2
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Schmies M, Patzer A, Schütz M, Miyazaki M, Fujii M, Dopfer O. Microsolvation of the acetanilide cation (AA+) in a nonpolar solvent: IR spectra of AA+–Lnclusters (L = He, Ar, N2; n ≤ 10). Phys Chem Chem Phys 2014; 16:7980-95. [DOI: 10.1039/c4cp00401a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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3
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Schmies M, Patzer A, Kruppe S, Miyazaki M, Ishiuchi S, Fujii M, Dopfer O. Microsolvation of the 4‐Aminobenzonitrile Cation (ABN
+
) in a Nonpolar Solvent: IR Spectra of ABN
+
L
n
(L=Ar and N
2
,
n
≤4). Chemphyschem 2012. [DOI: 10.1002/cphc.201200790] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Matthias Schmies
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin (Germany)
| | - Alexander Patzer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin (Germany)
| | - Sarah Kruppe
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin (Germany)
| | - Mitsuhiko Miyazaki
- Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226‐8503 (Japan)
| | - Shun‐ichi Ishiuchi
- Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226‐8503 (Japan)
| | - Masaaki Fujii
- Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226‐8503 (Japan)
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin (Germany)
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4
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SCHÄFER MARTIN, BORST DAVIDR, PRATT DAVIDW, BRENDEL KAI. Tunnelling splittings in the high resolution microwave and UV spectra of the benzonitrile—water complex: modelling the internal motion in its S0and S1states. Mol Phys 2009. [DOI: 10.1080/00268970210162754] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- MARTIN SCHÄFER
- a Department of Chemistry , University of Pittsburgh , Pittsburgh , Pennsylvania , 15260 , USA
| | - DAVID R. BORST
- a Department of Chemistry , University of Pittsburgh , Pittsburgh , Pennsylvania , 15260 , USA
| | - DAVID W. PRATT
- a Department of Chemistry , University of Pittsburgh , Pittsburgh , Pennsylvania , 15260 , USA
| | - KAI BRENDEL
- b Institut für Physikalische Chemie, Universität Kiel , Olshausenstr. 40, D-24098 , Kiel , Germany
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5
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Pasker FM, Solcà N, Dopfer O. Spectroscopic Identification of Carbenium and Ammonium Isomers of Protonated Aniline (AnH+): IR Spectra of Weakly Bound AnH+−Ln Clusters (L = Ar, N2). J Phys Chem A 2006; 110:12793-804. [PMID: 17125293 DOI: 10.1021/jp064571a] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Infrared photodissociation (IRPD) spectra of mass-selected clusters composed of protonated aniline (C6H8N+ = AnH+) and a variable number of neutral ligands (L = Ar, N2) are obtained in the N-H stretch range. The AnH+ -Ln complexes (n < or = 3) are produced by chemical ionization in a supersonic expansion of An, H2, and L. The IRPD spectra of AnH+-Ln feature the unambiguous fingerprints of at least two different AnH+ nucleation centers, namely, the ammonium isomer (5) and the carbenium ions (1 and/or 3) corresponding to protonation at the N atom and at the C atoms in the para and/or ortho positions, respectively. Protonation at the meta and ipso positions is not observed. Both classes of observed AnH+-Ln isomers exhibit very different photofragmentation behavior upon vibrational excitation arising from the different interaction strengths of the AnH+ cores with the surrounding neutral ligands. Analysis of the incremental N-H stretch frequency shifts as a function of cluster size shows that microsolvation of both 5 and 1/3 in Ar and N2 starts with the formation of intermolecular H bonds of the ligands to the acidic NH protons and proceeds by intermolecular pi bonding to the aromatic ring. The analysis of both the photofragmentation branching ratios and the N-H stretch frequencies demonstrates that the N-H bonds in 5 are weaker and more acidic than those in 1/3, leading to stronger intermolecular H bonds with L. The interpretation of the spectroscopic data is supported by density functional calculations conducted at the B3LYP level using the 6-31G* and 6-311G(2df,2pd) basis sets. Comparison with clusters of neutral aniline and the aniline radical cation demonstrates the drastic effect of protonation and ionization on the acidity of the N-H bonds and the topology of the intermolecular potential, in particular on the preferred aromatic substrate-nonpolar ligand recognition motif.
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Affiliation(s)
- Felix M Pasker
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, D-10623 Berlin, Germany
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Hobza P, Zahradník R, Müller-Dethlefs K. The World of Non-Covalent Interactions: 2006. ACTA ACUST UNITED AC 2006. [DOI: 10.1135/cccc20060443] [Citation(s) in RCA: 166] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The review focusses on the fundamental importance of non-covalent interactions in nature by illustrating specific examples from chemistry, physics and the biosciences. Laser spectroscopic methods and both ab initio and molecular modelling procedures used for the study of non-covalent interactions in molecular clusters are briefly outlined. The role of structure and geometry, stabilization energy, potential and free energy surfaces for molecular clusters is extensively discussed in the light of the most advanced ab initio computational results for the CCSD(T) method, extrapolated to the CBS limit. The most important types of non-covalent complexes are classified and several small and medium size non-covalent systems, including H-bonded and improper H-bonded complexes, nucleic acid base pairs, and peptides and proteins are discussed with some detail. Finally, we evaluate the interpretation of experimental results in comparison with state of the art theoretical models: this is illustrated for phenol...Ar, the benzene dimer and nucleic acid base pairs. A review with 270 references.
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Andrei HS, Solcà N, Dopfer O. Interaction of Ionic Biomolecular Building Blocks with Nonpolar Solvents: Acidity of the Imidazole Cation (Im+) Probed by IR Spectra of Im+−Ln Complexes (L = Ar, N2; n ≤ 3). J Phys Chem A 2005; 109:3598-607. [PMID: 16839026 DOI: 10.1021/jp0441487] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The intermolecular interaction between the imidazole cation (Im+ = C3N2H4+) and nonpolar ligands is characterized in the ground electronic state by infrared photodissociation (IRPD) spectroscopy of size-selected Im+-Ln complexes (L = Ar, N2) and quantum chemical calculations performed at the UMP2/6-311G(2df,2pd) and UB3LYP/6-311G(2df,2pd) levels of theory. The complexes are created in an electron impact cluster ion source, which predominantly produces the most stable isomers of a given cluster ion. The analysis of the size-dependent frequency shifts of both the N-H and the C-H stretch vibrations and the photofragmentation branching ratios provides valuable information about the stepwise microsolvation of Im+ in a nonpolar hydrophobic environment, including the formation of structural isomers, the competition between various intermolecular binding motifs (H-bonding and pi-bonding) and their interaction energies, and the acidity of both the CH and NH protons. In line with the calculations, the IRPD spectra show that the most stable Im+-L dimers feature planar H-bound equilibrium structures with nearly linear H-bonds of L to the acidic NH group of Im+. Further solvation occurs at the aromatic ring of Im+ via the formation of intermolecular pi-bonds. Comparison with neutral Im-Ar demonstrates the drastic effect of ionization on the topology of the intermolecular potential, in particular in the preferred aromatic substrate-nonpolar recognition motif, which changes from pi-bonding to H-bonding. .
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Affiliation(s)
- Horia-Sorin Andrei
- Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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Kang C, Pratt * DW. Structures, charge distributions, and dynamical properties of weakly bound complexes of aromatic molecules in their ground and electronically excited states. INT REV PHYS CHEM 2005. [DOI: 10.1080/01442350500161453] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Schmitt M, Ratzer C, Meerts WL. The structure of the phenol-nitrogen cluster: A joint experimental andab initiostudy. J Chem Phys 2004; 120:2752-8. [PMID: 15268420 DOI: 10.1063/1.1638378] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The rotationally resolved LIF spectra of four different isotopomers of the phenol--nitrogen cluster have been measured to elucidate the structural parameters of the cluster in ground and electronically excited (S1) state. The fit of the rotational constants has been performed by a genetic algorithm and by an assigned fit to the line frequencies. The results of both methods are compared. The intermolecular structures are fit to the inertial parameters and are compared to the results of ab initio calculations for both states. This fit was performed under the restriction that the geometry of the monomer moieties do not change upon complexation. Of the remaining five intermolecular parameters two dihedral angles were fixed due to the planarity of the complex, which was inferred from the inertial defects of all isotopomers. The distance of the nearest nitrogen atom to the hydrogen atom of the phenolic hydroxy group is found to decrease upon electronic excitation of the chromophore considerably more than predicted from ab initio calculations. This deviation between theory and experiment can be traced back to the absence of electron-electron correlation in the performed complete active space self-consistent field calculations. The shortening of the OH...NN "hydrogen" bond upon electronic excitation is in agreement with the increased dipole moment of phenol in the S1-state.
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Affiliation(s)
- Michael Schmitt
- Heinrich-Heine-Universität, Institut für Physikalische Chemie, D-40225 Düsseldorf, Germany.
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10
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Schäfer M. Internal rotation in the para-difluorobenzene–nitrogen van der Waals complex. Phys Chem Chem Phys 2004. [DOI: 10.1039/b401230p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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11
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Solcà N, Dopfer O. Microsolvation of the indole cation (In+) in a nonpolar environment: IR spectra of In+–Lncomplexes (L = Ar and N2, n ≤ 8). Phys Chem Chem Phys 2004. [DOI: 10.1039/b313110f] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Andrei HS, Solcà N, Dopfer O. Ionization-induced switch in aromatic molecule–nonpolar ligand recognition: Acidity of 1-naphthol+(1-Np+) rotamers probed by IR spectra of 1-Np+–Lncomplexes (L = Ar/N2, n ≤ 5). Phys Chem Chem Phys 2004. [DOI: 10.1039/b403970j] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Schäfer M, Kang C, Pratt DW. High Resolution Electronic Spectrum of the N2 van der Waals Complex of p-Difluorobenzene. Structure and Internal Motion. J Phys Chem A 2003. [DOI: 10.1021/jp035201e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Martin Schäfer
- Laboratorium für Physikalische Chemie, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland
| | - Cheolhwa Kang
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - David W. Pratt
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
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Stiles PL, Moore DT, Miller RE. Infrared spectroscopy of the isomers of magnesium–HCN formed in helium nanodroplets: Comparisons with ab initio calculations. J Chem Phys 2003. [DOI: 10.1063/1.1562160] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Solcà N, Dopfer O. Interaction between Aromatic Amine Cations and Quadrupolar Ligands: Infrared Spectra of Aniline+−(N2)n (n = 1−5) Complexes. J Phys Chem A 2002. [DOI: 10.1021/jp020900x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicola Solcà
- Institut für Physikalische Chemie, Universität Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Otto Dopfer
- Institut für Physikalische Chemie, Universität Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
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17
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Schäfer M. Internal rotation in high-resolution ultraviolet spectra. I. Semirigid model of a C2v top–Cs frame internal motion. J Chem Phys 2001. [DOI: 10.1063/1.1416874] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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