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Biswas S, Mandal S, Biswas P, Chakraborty T. Probing the Endo/ Exo Isomeric Variants of a Binary Complex of Cyclopropylamine with p-Fluorophenol by LIF Spectroscopy: A Comparative Study with Ammonia Complex. J Phys Chem A 2020; 124:5896-5906. [PMID: 32559102 DOI: 10.1021/acs.jpca.0c04289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Conformational isomers of an O-H···N hydrogen-bonded binary complex between para-fluorophenol (pFP) and a nonrigid primary amine base, cyclopropylamine (CPA), have been probed by means of laser-induced fluorescence (LIF) spectroscopy in a supersonic jet expansion. Two closely spaced electronic origin bands have been identified in the measured LIF excitation spectrum, and their assignments have been corroborated by making comparisons with the spectra of the parent pFP-NH3 complex recorded under the same expansion condition. The observation is consistent with the presence of endo and exo isomeric variants of the complex predicted by electronic structure theory methods, and the endo isomer is stabilized by ∼2 kcal/mol additionally owing to the formation of a C-H···O and a C-H···π type of weak hydrogen bonds between the two moieties. In the fluorescence excitation (FE) spectrum, the low-frequency bands for different intermolecular modes gain substantial intensity, and this spectral feature is in contrast to that of the pFP-NH3 complex. The Franck-Condon intensity of the bands has been simulated invoking Duschinsky rotation scheme, taking into consideration the ground- and excited-state geometries.
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Affiliation(s)
- Souvick Biswas
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Subhasis Mandal
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Pinakpani Biswas
- Environmental Research Group (R&D), Tata Steel India Ltd., Jamshedpur 831 001, India
| | - Tapas Chakraborty
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
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Kumar S, Singh SK, Vaishnav JK, Hill JG, Das A. Interplay among Electrostatic, Dispersion, and Steric Interactions: Spectroscopy and Quantum Chemical Calculations of π-Hydrogen Bonded Complexes. Chemphyschem 2017; 18:828-838. [PMID: 28124829 DOI: 10.1002/cphc.201601405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 01/24/2017] [Indexed: 11/07/2022]
Abstract
π-Hydrogen bonding interactions are ubiquitous in both materials and biology. Despite their relatively weak nature, great progress has been made in their investigation by experimental and theoretical methods, but this becomes significantly more complicated when secondary intermolecular interactions are present. In this study, the effect of successive methyl substitution on the supramolecular structure and interaction energy of indole⋅⋅⋅methylated benzene (ind⋅⋅⋅n-mb, n=1-6) complexes is probed through a combination of supersonic jet experiments and benchmark-quality quantum chemical calculations. It is demonstrated that additional secondary interactions introduce a subtle interplay among electrostatic and dispersion forces, as well as steric repulsion, which fine-tunes the overall structural motif. Resonant two-photon ionization and IR-UV double-resonance spectroscopy techniques are used to probe jet-cooled ind⋅⋅⋅n-mb (n=2, 3, 6) complexes, with redshifting of the N-H IR stretching frequency showing that increasing the degree of methyl substitution increases the strength of the primary N-H⋅⋅⋅π interaction. Ab initio harmonic frequency and binding energy calculations confirm this trend for all six complexes. Electronic spectra of the three dimers are broad and structureless, with quantum chemical calculations revealing that this is likely to be due to multiple tilted conformations of each dimer possessing similar stabilization energies.
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Affiliation(s)
- Sumit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Pashan, Pune, 411008, Maharashtra, India.,Present address: Department of Dynamics at Surfaces, Max Planck Institute of Biophysical Chemistry, Am Faßberg 11, 37077, Gottingen, Germany
| | - Santosh K Singh
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Pashan, Pune, 411008, Maharashtra, India
| | - Jamuna K Vaishnav
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Pashan, Pune, 411008, Maharashtra, India.,Present address: Indian Institute of Technology (IIT) Indore, Khandwa Rd, Simrol, Madhya, Pradesh, 452020, India
| | - J Grant Hill
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
| | - Aloke Das
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Pashan, Pune, 411008, Maharashtra, India
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Singh SK, Vaishnav JK, Das A. Experimental observation of structures with subtle balance between strong hydrogen bond and weak n → π* interaction: Gas phase laser spectroscopy of 7-azaindole⋯fluorosubstituted pyridines. J Chem Phys 2016; 145:104302. [DOI: 10.1063/1.4962358] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Santosh K. Singh
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Jamuna K. Vaishnav
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Aloke Das
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
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Frey JA, Holzer C, Klopper W, Leutwyler S. Experimental and Theoretical Determination of Dissociation Energies of Dispersion-Dominated Aromatic Molecular Complexes. Chem Rev 2016; 116:5614-41. [DOI: 10.1021/acs.chemrev.5b00652] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jann A. Frey
- Departement
für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Christof Holzer
- Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, D-76131 Karlsruhe, Germany
| | - Wim Klopper
- Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, D-76131 Karlsruhe, Germany
| | - Samuel Leutwyler
- Departement
für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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Balmer FA, Trachsel MA, van der Avoird A, Leutwyler S. The elusive S2 state, the S1/S2 splitting, and the excimer states of the benzene dimer. J Chem Phys 2015; 142:234306. [DOI: 10.1063/1.4922608] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Franziska A. Balmer
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Maria A. Trachsel
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Ad van der Avoird
- Theoretical Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Samuel Leutwyler
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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Trachsel MA, Ottiger P, Frey HM, Pfaffen C, Bihlmeier A, Klopper W, Leutwyler S. Modeling the Histidine–Phenylalanine Interaction: The NH···π Hydrogen Bond of Imidazole·Benzene. J Phys Chem B 2015; 119:7778-90. [DOI: 10.1021/jp512766r] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Maria A. Trachsel
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Philipp Ottiger
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Hans-Martin Frey
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Chantal Pfaffen
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Angela Bihlmeier
- Institute of Physical
Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg
2, D-76131 Karlsruhe, Germany
| | - Wim Klopper
- Institute of Physical
Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg
2, D-76131 Karlsruhe, Germany
| | - Samuel Leutwyler
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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Ahnen S, Hehn AS, Vogiatzis KD, Trachsel MA, Leutwyler S, Klopper W. Accurate computations of the structures and binding energies of the imidazole ⋯benzene and pyrrole ⋯benzene complexes. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2014.05.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kumar S, Das A. Effect of acceptor heteroatoms on π-hydrogen bonding interactions: a study of indole···thiophene heterodimer in a supersonic jet. J Chem Phys 2013; 137:094309. [PMID: 22957571 DOI: 10.1063/1.4748818] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Resonant two photon ionization (R2PI), IR-UV, and UV-UV double resonance spectroscopic techniques combined with quantum chemistry calculations have been used to determine the structure of indole···thiophene dimer observed in a supersonic jet. With the help of combined experimental and theoretical IR spectra it has been found that the observed dimer has a N-H···π hydrogen bonded slanted T-shaped structure. The present study demonstrates the effect of heteroatoms present in the acceptors on the strength of the π-hydrogen bonding interactions. It was concluded by Sherrill and co-workers from their theoretical study of benzene···pyridine dimer that aromatic rings containing heteroatoms are poorest π-hydrogen bond acceptors [E. G. Hohenstein and C. D. Sherrill, J. Phys. Chem. A 113, 878 (2009)]. But the current spectroscopic investigation exhibits that five membered aromatic heterocycles are favorable π-hydrogen bond acceptors. In this study, it has also been shown that thiophene is a better π-hydrogen bond acceptor than furan. The present work has immense biological significance as indole is the chromophore of tryptophan residue in the proteins and thiophene derivatives have potential therapeutic applications. Thus, understanding the binding motif between indole and thiophene in the heterodimer studied in this work may help in designing efficient drugs.
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Affiliation(s)
- Sumit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research, 900 NCL Innovation Park, Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India
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Kumar S, Pande V, Das A. π-Hydrogen Bonding Wins over Conventional Hydrogen Bonding Interaction: A Jet-Cooled Study of Indole···Furan Heterodimer. J Phys Chem A 2012; 116:1368-74. [DOI: 10.1021/jp211366z] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sumit Kumar
- Department of Chemistry, Indian Institute of Science Education & Research (IISER), 900 NCL Innovation Park, Dr. Homi Bhabha Road, Pune-411008, Maharashtra, India
| | - Vedant Pande
- Department of Chemistry, Indian Institute of Science Education & Research (IISER), 900 NCL Innovation Park, Dr. Homi Bhabha Road, Pune-411008, Maharashtra, India
| | - Aloke Das
- Department of Chemistry, Indian Institute of Science Education & Research (IISER), 900 NCL Innovation Park, Dr. Homi Bhabha Road, Pune-411008, Maharashtra, India
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Uhl W, Voß M, Müller J, Seubert K. Synthesis of a Large Functional Cage Compound Based on Four GaGa Single Bonds and Its Application as an Oligoacceptor: On the Way to Bio‐Organogallium Hybrid Molecules. Chemistry 2011; 17:7852-7. [DOI: 10.1002/chem.201100865] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Werner Uhl
- Institut für Anorganische und Analytische Chemie der Universität Münster, Corrensstrasse 30, 48149 Münster (Germany), Fax: (+49) 251‐8336660
| | - Matthias Voß
- Institut für Anorganische und Analytische Chemie der Universität Münster, Corrensstrasse 30, 48149 Münster (Germany), Fax: (+49) 251‐8336660
| | - Jens Müller
- Institut für Anorganische und Analytische Chemie der Universität Münster, Corrensstrasse 30, 48149 Münster (Germany), Fax: (+49) 251‐8336660
| | - Kristof Seubert
- Institut für Anorganische und Analytische Chemie der Universität Münster, Corrensstrasse 30, 48149 Münster (Germany), Fax: (+49) 251‐8336660
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Bachorz RA, Bischoff FA, Glöss A, Hättig C, Höfener S, Klopper W, Tew DP. The MP2-F12 method in the Turbomole program package. J Comput Chem 2011; 32:2492-513. [PMID: 21590779 DOI: 10.1002/jcc.21825] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Revised: 03/25/2011] [Accepted: 03/27/2011] [Indexed: 01/21/2023]
Abstract
A detailed description of the explicitly correlated second-order Møller-Plesset perturbation theory (MP2-F12) method, as implemented in the TURBOMOLE program package, is presented. The TURBOMOLE implementation makes use of density fitting, which greatly reduces the prefactor for integral evaluation. Methods are available for the treatment of ground states of open- and closed-shell species, using unrestricted as well as restricted (open-shell) Hartree-Fock reference determinants. Various methodological choices and approximations are discussed. The performance of the TURBOMOLE implementation is illustrated by example calculations of the molecules leflunomide, prednisone, methotrexate, ethylenedioxytetrafulvalene, and a cluster model for the adsorption of methanol on the zeolite H-ZSM-5. Various basis sets are used, including the correlation-consistent basis sets specially optimized for explicitly correlated calculations (cc-pVXZ-F12).
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Affiliation(s)
- Rafał A Bachorz
- Center for Functional Nanostructures (CFN, Karlsruhe Institute of Technology, Karlsruhe, Germany
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Pfaffen C, Infanger D, Ottiger P, Frey HM, Leutwyler S. N–H⋯π hydrogen-bonding and large-amplitude tipping vibrations in jet-cooled pyrrole–benzene. Phys Chem Chem Phys 2011; 13:14110-8. [DOI: 10.1039/c1cp20793h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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