1
|
Rajani P, Chandra S, Ramanathan N, Sundararajan K, Rao CB. Exploring the conformations of Dibutyl Phosphonate (DBP): A matrix isolation infrared spectroscopic and density functional theory studies. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
2
|
Sarkar S, Chandra S, Suryaprasad B, Ramanathan N, Sundararajan K, Suresh A. Conformational topography of tris(2-methylbutyl) phosphate and the influence of methyl branching at the non-hyperconjugative carbon on the conformational landscape: insights from matrix isolation infrared spectroscopy and DFT computations. Phys Chem Chem Phys 2020; 22:24372-24392. [PMID: 33084659 DOI: 10.1039/d0cp03403g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The branching of a methyl group in a linear chain has a profound influence on the conformational morphology as it wields a strong control in reducing a large number of conformations. To unravel the effect of branching on the second non-hyperconjugative carbon atom on the conformational landscape, the conformations of tris(2-methylbutyl)phosphate (T2MBP) were studied using Density Functional Theory (DFT) computations and matrix isolation infrared spectroscopy. Experimentally, T2MBP along with N2/Ar/Kr/Xe gases was effusively expanded and deposited at a low temperature of 12 K, which was subsequently probed using infrared spectroscopy. The computations of all the conformations were accomplished using the B3LYP level of theory with the 6-311++G(d,p) basis set. A dimethyl(2-methylbutyl) phosphate (DM2MBP) prototype, a molecule containing a single 2-methylbutyl moiety, was examined for its conformations. Computations predicted 18 and 9 conformations each for the 'gauche' and 'trans' families, respectively, in which the third branched carbon completely influences the orientation of the fourth carbon, which simplifies the conformational problem of DM2MBP. Of the 18 and 9 bunches each in the 'gauche' and 'trans' families, only 7 and 3 conformations, respectively, became energetically important, which when extrapolated to T2MBP resulted in 343 and 147 conformational possibilities. The factor of degeneracy further reduced these numbers and a total of 168 conformations effectively contribute to the conformational composition of T2MBP in the gas phase. The role of stereo electronic and steric factors prevalent in the conformational clusters of T2MBP was unravelled respectively using natural bond orbital and non-covalent interaction analyses.
Collapse
Affiliation(s)
- Subramee Sarkar
- Homi Bhabha National Institute, Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India.
| | | | | | | | | | | |
Collapse
|
3
|
Ramanathan N, Sarkar S, Sundararajan K, Chandrasekar A, Sankaran K, Suresh A. Influence of Branching on the Conformational Space: Case Study of Tri-sec-butyl Phosphate Using Matrix Isolation Infrared Spectroscopy and DFT Computations. J Phys Chem A 2018; 122:8229-8242. [DOI: 10.1021/acs.jpca.8b08157] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N. Ramanathan
- Materials Chemistry & Metal Fuel Cycle Group, Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - Shubhra Sarkar
- Materials Chemistry & Metal Fuel Cycle Group, Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - K. Sundararajan
- Materials Chemistry & Metal Fuel Cycle Group, Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - Aditi Chandrasekar
- Materials Chemistry & Metal Fuel Cycle Group, Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - K. Sankaran
- Materials Chemistry & Metal Fuel Cycle Group, Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - A. Suresh
- Materials Chemistry & Metal Fuel Cycle Group, Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| |
Collapse
|
4
|
Ramanathan N, Sundararajan K, Viswanathan KS. Conformational Landscape of Tri-n-butyl Phosphate: Matrix Isolation Infrared Spectroscopy and Systematic Computational Analysis. J Phys Chem A 2017; 121:6108-6121. [DOI: 10.1021/acs.jpca.7b05006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. Ramanathan
- Materials
Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India
| | - K. Sundararajan
- Materials
Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India
| | - K. S. Viswanathan
- Department of Chemical Sciences, Indian Institute of Science Education & Research, Sector 81, Mohali 140306, Punjab, India
| |
Collapse
|
5
|
Ramanathan N, Brahmmananda Rao CVS, Sankaran K, Sundararajan K. Unraveling the Conformational Landscape of Triallyl Phosphate: Matrix Isolation Infrared Spectroscopy and Density Functional Theory Computations. J Phys Chem A 2015; 119:4017-31. [DOI: 10.1021/acs.jpca.5b00889] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. Ramanathan
- Chemistry
Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | | | - K. Sankaran
- Chemistry
Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - K. Sundararajan
- Chemistry
Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| |
Collapse
|
6
|
Kar BP, Ramanathan N, Sundararajan K, Viswanathan K. Matrix isolation and DFT study of the conformations of diethylcarbonate. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.04.044] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
7
|
Szekrényes Z, Kamarás K, Tarczay G, Llanes-Pallás A, Marangoni T, Prato M, Bonifazi D, Björk J, Hanke F, Persson M. Melting of Hydrogen Bonds in Uracil Derivatives Probed by Infrared Spectroscopy and ab Initio Molecular Dynamics. J Phys Chem B 2012; 116:4626-33. [DOI: 10.1021/jp212115h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Zsolt Szekrényes
- Institute for Solid State Physics
and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary
| | - Katalin Kamarás
- Institute for Solid State Physics
and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary
| | - György Tarczay
- Laboratory of Molecular Spectroscopy,
Institute of Chemistry, Eötvös Loránd University, H-1518 Budapest, Hungary
| | - Anna Llanes-Pallás
- Dipartimento di Scienze Farmaceutiche
and INSTM UdR di Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy
| | - Tomas Marangoni
- Dipartimento di Scienze Farmaceutiche
and INSTM UdR di Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy
| | - Maurizio Prato
- Dipartimento di Scienze Farmaceutiche
and INSTM UdR di Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy
| | - Davide Bonifazi
- Dipartimento di Scienze Farmaceutiche
and INSTM UdR di Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy
- Department of Chemistry, University of Namur (FUNDP), Rue de Bruxelles 61, 5000
Namur, Belgium
| | - Jonas Björk
- The Surface
Science Research
Centre, The University of Liverpool, Liverpool
L69 3BX, U.K
- Department of Physics,
Chemistry, and
Biology, IFM, Linköping University, 58183 Linköping, Sweden
| | - Felix Hanke
- The Surface
Science Research
Centre, The University of Liverpool, Liverpool
L69 3BX, U.K
| | - Mats Persson
- The Surface
Science Research
Centre, The University of Liverpool, Liverpool
L69 3BX, U.K
- Department of Applied Physics, Chalmers University of Technology, 41296 Göteborg,
Sweden
| |
Collapse
|
8
|
Ramanathan N, Sundararajan K, Kar BP, Viswanathan KS. Conformations of Trimethyl Phosphite: A Matrix Isolation Infrared and ab Initio Study. J Phys Chem A 2011; 115:10059-68. [DOI: 10.1021/jp205368k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. Ramanathan
- Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
| | - K. Sundararajan
- Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
| | - Bishnu Prasad Kar
- Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
| | - K. S. Viswanathan
- Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
| |
Collapse
|
9
|
|
10
|
|
11
|
Kavitha V, Viswanathan KS. Conformations of dimethoxydimethylsilane: matrix isolation infrared and ab initio studies. J Phys Chem A 2007; 111:1879-86. [PMID: 17388276 DOI: 10.1021/jp066837j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Conformations of dimethoxydimethylsilane (DMDMS) were studied using matrix isolation infrared spectroscopy, by trapping the silane in argon and nitrogen matrixes. The matrix was deposited using both an effusive and a supersonic jet source. The effusive source was maintained at two different temperatures, viz. 298 and 433 K, during deposition to alter the conformational population of the silane. The experimental results were supported by computations performed at both the HF and B3LYP levels, using 6-31++G** basis set. Vibrational frequency calculations were carried out to assign the experimental features and also to ensure that the computed structures did indeed correspond to minima. A conformer with a G+/-G-/+ structure was found to be the ground state, while G+/-T and G+/-G+/- structures were the next higher energy conformers with energies of 1.32 and 1.48 kcal/mol, respectively. Natural bond orbital analysis was carried out at both HF/6-31++G** and B3LYP/6-31++G** level which indicated that the charge-transfer hyperconjugative interactions largely determine the conformational preferences in this molecule. This interaction appears to be smaller in DMDMS than in the corresponding carbon analogue, dimethoxypropane (DMP).
Collapse
Affiliation(s)
- V Kavitha
- Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
| | | |
Collapse
|