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Bhattacharya I, Banerjee P. From 'halogen' to 'tetrel' bonds: matrix isolation IR spectroscopic and quantum mechanical studies of the effect of central atom substitution in donor tetrahalogens on binary complex formation with formic acid. Phys Chem Chem Phys 2024; 26:21538-21547. [PMID: 39082089 DOI: 10.1039/d4cp01949k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
Binary complex formation between silicon tetrachloride (SiCl4) and formic acid (FA) has been observed in an argon matrix environment. Such complex formation manifests as spectral shifts in signature vibrations of the latter, namely the νCO, νC-O and νO-H vibrations. Quantum chemical calculations reveal that the most stable conformers of the complex involve predominantly the tetrel bond, which has been defined in existing literature as a variant of the "σ-hole" interactions. Here, regions of positive electrostatic potential on the tetrahedral face of SiCl4 act as electrophilic centers (σ-hole) to which the nucleophilic carbonyl group of FA is able to bind. Atoms-in-molecules analysis predicts a bond critical point along the non-covalent contact between the tetrel atom Si and the carbonyl oxygen on FA, corroborating the presence of the tetrel bond. The hyperconjugative interaction parameters at the binding interface obtained from Natural Bond Orbital (NBO) analysis are also consistent with such observations. Although apparently similar to SiCl4, there are noticeable differences in the binding preferences of the lower homologue carbon tetrachloride (CCl4). The binary complexes of the latter with the same FA acceptor molecule have been previously shown to involve halogen bonded, rather than tetrel bonded interactions (Banerjee and Bhattacharya, Spectrochim. Acta Mol. and Biomol. Spectrosc., 2021, 250, 119355). Such variations in the nature of non-covalent interactions of these tetrahalogens are attributed to differences in the distribution of electronic charge density surrounding the central tetrel atom, as obtained from mappings of their electrostatic potential surfaces. Our combined experimental and theoretical findings therefore provide direct evidence of the growing propensity of tetrel atoms to engage in tetrel bonding as we move lower down Group 14, and re-assert the reluctance of the smaller and more electronegative carbon atom to serve as a tetrel bond participant.
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Affiliation(s)
- Indrani Bhattacharya
- Department of Chemical and Biological Sciences, S.N. Bose National Centre for Basic Sciences, Kolkata, West Bengal, India.
| | - Pujarini Banerjee
- Department of Chemistry, Diamond Harbour Women's University, Sarisha, West Bengal, India.
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Cozzolino A, Monaco G, Daniel C, Rizzo P, Guerra G. Monomeric and Dimeric Carboxylic Acid in Crystalline Cavities and Channels of Delta and Epsilon Forms of Syndiotactic Polystyrene. Polymers (Basel) 2021; 13:3330. [PMID: 34641146 PMCID: PMC8512363 DOI: 10.3390/polym13193330] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 09/22/2021] [Accepted: 09/22/2021] [Indexed: 12/03/2022] Open
Abstract
Delta (δ) and epsilon (ε) co-crystalline forms of syndiotactic polystyrene with a carboxylic acid guest were obtained by sorption of liquid hexanoic acid in syndiotactic polystyrene films exhibiting delta and epsilon nanoporous-crystalline forms. The characterization study is facilitated by axially stretched syndiotactic polystyrene films, used both for polarized FTIR spectra and for WAXD fiber patterns. Particularly informative are two carbonyl-stretching FTIR peaks, attributed to monomeric and dimeric hexanoic acid. The dichroism of these carbonyl peaks indicates that both delta and epsilon phases are able to include hexanoic acid as isolated guest molecules, while only the epsilon phase is also able to include dimeric hexanoic acid molecules in its crystalline channels. The inclusion of both isolated and dimeric hexanoic acid species in the epsilon form crystalline channels produces extremely fast hexanoic acid uptakes by syndiotactic polystyrene epsilon form films.
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Affiliation(s)
- Antonietta Cozzolino
- Dipartimento di Chimica e Biologia “A. Zambelli” and INSTM Research Unit, Università degli Studi di Salerno, Via Giovanni Paolo II, 13284084 Fisciano, Italy; (G.M.); (C.D.); (G.G.)
| | | | | | - Paola Rizzo
- Dipartimento di Chimica e Biologia “A. Zambelli” and INSTM Research Unit, Università degli Studi di Salerno, Via Giovanni Paolo II, 13284084 Fisciano, Italy; (G.M.); (C.D.); (G.G.)
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Feldman VI, Ryazantsev SV, Kameneva SV. Matrix isolation in laboratory astrochemistry: state-of-the-art, implications and perspective. RUSSIAN CHEMICAL REVIEWS 2021. [DOI: 10.1070/rcr4995] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Banerjee P, Bhattacharya I. Direct matrix isolation IR spectroscopic evidence of halogen bonding from a comparative study of complexes of CBr 4 and CCl 4with acetone and formic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 250:119355. [PMID: 33482573 DOI: 10.1016/j.saa.2020.119355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 12/15/2020] [Accepted: 12/16/2020] [Indexed: 06/12/2023]
Abstract
Binary complexes of acetone and formic acid with tetrahalomethanes CBr4 and CCl4 have been isolated in argon matrix. Spectral shifts in the characteristic νC=O region of acetone, as well as in the fingerprint regions, are unambiguously assigned to the formation of halogen bond involving one of the halogen atoms on CBr4/CCl4 as donor, and the carbonyl oxygen of acetone as acceptor. The higher magnitude of shifts of νC=O and the fingerprint vibrations for the CBr4 complex, as compared to the CCl4 complex, is consistent with theoretical predictions of higher value of positive electrostatic potential in the "σ-hole" region of the former, and hence its higher susceptibility to halogen bonding. The formation of halogen bonded complexes involving formic acid as acceptor and CBr4/CCl4 as donors is also being reported for the first time. In this case too, distinct shifts are obtained in the νC=O as well as νC-O regions of formic acid, which again are significantly larger in magnitude for the CBr4 complex, as compared to the CCl4 complex. Electronic structure calculations have been carried out using different theoretical methods to identify the various possible structural isomers of the halogen bonded complexes, and to obtain relevant information regarding their energies and intermolecular geometrical parameters. In addition, NBO and AIM analysis have been carried out to understand the role of local interactions at the halogen bonded interface. Such predicted data are found to be consistent with experimental observations, and re-assert the stronger nature of CBr4 as halogen bond donor, as compared to CCl4.
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Affiliation(s)
- Pujarini Banerjee
- Department of Chemistry, Diamond Harbour Women's University, Sarisha, West Bengal, India.
| | - Indrani Bhattacharya
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata, West Bengal, India
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Bhattacharya I, Sadhukhan J, Biswas S, Chakraborty T. Medium-Dependent Crossover from the Red to Blue Shift of the Donor’s Stretching Fundamental in the Binary Hydrogen-Bonded Complexes of CDCl3 with Ethers and Ketones. J Phys Chem A 2020; 124:7259-7270. [DOI: 10.1021/acs.jpca.0c03946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Indrani Bhattacharya
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Jayshree Sadhukhan
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
- Department of Chemistry, Govt. General Degree College, Singur, Hooghly 712409, West Bengal, India
| | - Souvick Biswas
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Tapas Chakraborty
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
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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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Tang S, Du L. Effects of methylation in acceptors on the hydrogen bond complexes between 2,2,2-trifluoroethanol and cyclic ethers. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 217:237-246. [PMID: 30947132 DOI: 10.1016/j.saa.2019.03.088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/24/2019] [Accepted: 03/25/2019] [Indexed: 05/15/2023]
Abstract
In order to explore the effect of methylation on the stability and spectral shift of hydrogen bond complexes, the complexes of 2,2,2-trifluoroethanol (TFE) with propylene oxide (PO) and isobutylene oxide (IBO) were investigated by Fourier transform infrared (FTIR) spectroscopy and ab initio computations. The comparable OH-stretching red shifts were observed upon complexation, and an enhancement of the OH-stretching band is shown with the partial pressure of monomers increasing. The OH-stretching frequency of TFE is red shifted by 180 and 201 cm-1 with PO and IBO, respectively. By using quantum chemical calculations, we predicted the geometric parameters, binding energies, and spectral shifts of TFEPO/IBO hydrogen bond complexes. The calculated and observed spectral shifts follow the same trends. Compared with the TFEethylene oxide (EO) complex, the strength of the hydrogen bond in complex increases with the addition of methyl group, which likely results from the increase in basicity of the hydrogen bond acceptor. By combining the experimental integrated absorbance and the calculated IR intensity of the OH-stretching vibrational transition, the equilibrium constant for the complex formation was determined. In addition, atoms-in-molecules (AIM) and natural bond orbital (NBO) analyses were carried out to explain the red shift and the nature of the interaction in these complexes.
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Affiliation(s)
- Shanshan Tang
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China
| | - Lin Du
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China.
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Aljaber AS, Bani-Yaseen AD. Computational exploration of the effect of molecular medium on the tautomerization of azo prodrug of 5-aminosalicylic acid. J Mol Graph Model 2019; 86:160-169. [DOI: 10.1016/j.jmgm.2018.10.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 09/14/2018] [Accepted: 10/16/2018] [Indexed: 12/18/2022]
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Behera B, Das PK. Blue- and Red-Shifting Hydrogen Bonding: A Gas Phase FTIR and Ab Initio Study of RR'CO···DCCl 3 and RR'S···DCCl 3 Complexes. J Phys Chem A 2018; 122:4481-4489. [PMID: 29683668 DOI: 10.1021/acs.jpca.7b11962] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Blue-shifting H-bonded (C-D···O) complexes between CDCl3 and CH3HCO, (CH3)2CO, and C2H5(CH3)CO, and red-shifting H-bonded (C-D···S) complexes between CDCl3 with (CH3)2S and (C2H5)2S have been identified by Fourier transform infrared spectroscopy in the gas phase at room temperature. With increasing partial pressure of the components, a new band appears in the C-D stretching region of the vibrational spectra. The intensity of this band decreases with an increase in temperature at constant pressure, which provides the basis for identification of the H-bonded bands in the spectrum. The C-D stretching frequency of CDCl3 is blue-shifted by +7.1, +4, and +3.2 cm-1 upon complexation with CH3HCO, (CH3)2CO, and C2H5(CH3)CO, respectively, and red-shifted by -14 and -19.2 cm-1 upon complexation with (CH3)2S and (C2H5)2S, respectively. By using quantum chemical calculations at the MP2/6-311++G** level, we predict the geometry, electronic structural parameters, binding energy, and spectral shift of H-bonded complexes between CDCl3 and two series of compounds named RCOR' (H2CO, CH3HCO, (CH3)2CO, and C2H5(CH3)CO) and RSR' (H2S, CH3HS, (CH3)2S, and (C2H5)2S) series. The calculated and observed spectral shifts follow the same trends. With an increase in basicity of the H-bond acceptor, the C-D bond length increases, force constant decreases, and the frequency shifts to the red from the blue. The potential energy scans of the above complexes are done, which show that electrostatic attraction between electropositive D and electron-rich O/S causes bond elongation and red shift, and the electronic and nuclear repulsions lead to bond contraction and blue shifts. The dominance of the two opposing forces at the equilibrium geometry of the complex determines the nature of the shift, which changes both in magnitude and in direction with the basicity of the hydrogen-bond acceptor.
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Affiliation(s)
- B Behera
- Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - Puspendu K Das
- Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India
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Banerjee P, Chakraborty T. Weak hydrogen bonds: insights from vibrational spectroscopic studies. INT REV PHYS CHEM 2018. [DOI: 10.1080/0144235x.2018.1419731] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Pujarini Banerjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata, India
| | - Tapas Chakraborty
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata, India
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Karir G, Kumar G, Kar BP, Viswanathan KS. Multiple Hydrogen Bond Tethers for Grazing Formic Acid in Its Complexes with Phenylacetylene. J Phys Chem A 2018; 122:2046-2059. [DOI: 10.1021/acs.jpca.7b11428] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ginny Karir
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Sector 81, Mohali 140306, Punjab India
| | - Gaurav Kumar
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Sector 81, Mohali 140306, Punjab India
| | - Bishnu Prasad Kar
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Sector 81, Mohali 140306, Punjab India
| | - K. S. Viswanathan
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Sector 81, Mohali 140306, Punjab India
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Duarte L, Rekola I, Khriachtchev L. Complex between Formic Acid and Nitrous Oxide: A Matrix-Isolation and Computational Study. J Phys Chem A 2017; 121:8728-8737. [DOI: 10.1021/acs.jpca.7b09586] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luís Duarte
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - Iiris Rekola
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - Leonid Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
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Samanta AK, Banerjee P, Bandyopadhyay B, Pandey P, Chakraborty T. Antagonistic Interplay Between an Intermolecular CH···O and an Intramolecular OH···O Hydrogen Bond in a 1:1 Complex Between 1,2-Cyclohexanedione and Chloroform: A Combined Matrix Isolation Infrared and Quantum Chemistry Study. J Phys Chem A 2017; 121:6012-6020. [PMID: 28737917 DOI: 10.1021/acs.jpca.7b05615] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Matrix isolation infrared spectra of a weak C-H···O hydrogen-bonded complex between the keto-enol form of 1,2-cyclohexanedione (HCHD) and chloroform have been measured. The spectra reveal that the intramolecular O-H···O H-bond of HCHD is weakened as a result of complex formation, manifesting in prominent blue shift (∼23 cm-1) of the νO-H band and red shifts (∼7 cm-1) of νC═O bands of the acceptor (HCHD). The νC-H band of donor CHCl3 undergoes a large red shift of ∼33 cm-1. Very similar spectral effects are also observed for formation of the complex in CCl4 solution at room temperature. Our analysis reveals that out of several possible iso-energetic conformational forms of the complex, the one involving antagonistic interplay between the two hydrogen bonds (intermolecular C-H···O and intramolecular O-H···O) is preferred. The combined experimental and calculated data presented here suggest that in condensed media, conformational preferences are guided by directional hyperconjugative charge transfer interactions at the C-H···O hydrogen bonding site of the complex.
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Affiliation(s)
- Amit Kumar Samanta
- Center for Free-Electron Laser Science (CFEL) , Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - Pujarini Banerjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science , Kolkata, India
| | - Biman Bandyopadhyay
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, J. L. N. Marg , Jaipur, India
| | | | - Tapas Chakraborty
- Department of Physical Chemistry, Indian Association for the Cultivation of Science , Kolkata, India
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Karir G, Viswanathan KS. H−π Landscape of the Phenylacetylene–HCl System: Does This Provide the Gateway to the Markovnikov Addition? J Phys Chem A 2017; 121:5797-5808. [DOI: 10.1021/acs.jpca.7b04853] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ginny Karir
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Sector 81, Mohali 140306, Punjab India
| | - K. S. Viswanathan
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Sector 81, Mohali 140306, Punjab India
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Verma K, Viswanathan KS. The borazine dimer: the case of a dihydrogen bond competing with a classical hydrogen bond. Phys Chem Chem Phys 2017; 19:19067-19074. [PMID: 28702569 DOI: 10.1039/c7cp04056c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dimers of borazine were studied using matrix isolation infrared spectroscopy and ab initio quantum chemical calculations. Computations were performed at the MP2 and M06-2X levels of theory using the 6-311++G(d,p) and aug-cc-pVDZ basis sets for the various homodimers. At both levels of theory, an aligned stacked structure was found to be the global minimum, which was nearly isoenergetic to a parallel displaced structure. A T-shaped structure, where the N-H of one borazine pointed towards the N of the second borazine, was found to be a local minimum. In addition to these structures, a dihydrogen bonded structure, where the hydrogen attached to the nitrogen of borazine interacted with the hydrogen attached to the boron atom of another borazine, was also indicated. Experimentally, we observed the T-shaped dimer and the dihydrogen bonded dimer. This is one of the rare examples of experimental evidence for a dihydrogen bond, in a system other than in a metal hydride. These results for the borazine dimer were clearly different from the benzene dimer where the parallel displaced structure was found to be the global minimum followed by the T-shaped structure at the MP2/aug-cc-pVDZ level of theory. AIM, EDA and NBO analyses were carried out for all the structures to explore the nature of interactions.
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Affiliation(s)
- Kanupriya Verma
- Department of Chemical Sciences, Indian Institute of Science Education & Research, Mohali, 140306 Punjab, India.
| | - K S Viswanathan
- Department of Chemical Sciences, Indian Institute of Science Education & Research, Mohali, 140306 Punjab, India.
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Banerjee P, Bhattacharya I, Chakraborty T. Cooperative effect on phenolic ν O-H frequencies in 1:1 hydrogen bonded complexes of o-fluorophenols with water: A matrix isolation infrared spectroscopic study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 181:116-121. [PMID: 28347922 DOI: 10.1016/j.saa.2017.03.042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Revised: 03/14/2017] [Accepted: 03/17/2017] [Indexed: 06/06/2023]
Abstract
Matrix isolation infrared spectra of 1:1 complexes of two ortho-fluorophenols, 2-fluorophenol (2-FPh) and 2,6-difluorophenol (2,6-DFPh), with water and benzene have been analyzed in combination with electronic structure calculations to investigate cooperative effect in O-H···O-H···F hydrogen bonded linkage, which manifests as large spectral shifts of the phenolic O-H stretching fundamental. Calculation predicts that a nearly planar cyclic geometry is preferred by the binary water complexes of the syn conformer of 2-FPh as well as 2,6-DFPh, and the observed spectral shifts are in good agreement with the predicted shifts for such conformers. On the other hand, for other possible isomeric structures, the molecular plane of water moiety is oriented perpendicular to that of the fluorophenols, and the observed as well as predicted shifts are smaller than those of the ortho substituted fluorophenols, although the total binding energies are predicted to be larger for the former. The observed spectral shifts are however consistent with local interaction energy parameters, like hyperconjugative charge transfer and accumulation of electron density (ρ) along the O-H···O hydrogen bond path. For the binary O-H···π hydrogen bonded benzene complexes of the fluorophenols, where cooperative interaction is not possible, the observed shifts are consistent with the conformers preferred according to total binding energies as well as local charge transfer effects of the complexes.
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Affiliation(s)
- Pujarini Banerjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India.
| | - Indrani Bhattacharya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Tapas Chakraborty
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India.
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Sapunov VN, Voronov MS, Gustyakova SI, Kozeeva IS, Makarova EM. Specific process features of epoxidation of fatty acid methyl esters of vegetable oils with performic acid generated in situ. RUSS J APPL CHEM+ 2017. [DOI: 10.1134/s1070427217010098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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BANERJEE PUJARINI, BHATTACHARYA INDRANI, CHAKRABORTY TAPAS. Matrix isolation infrared spectra of O-H ⋯ π Hydrogen bonded complexes of Acetic acid and Trifluoroacetic acid with Benzene. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1165-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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