Nitrogen as a pnicogen?: Evidence for π-hole driven novel N…N interaction in nitromethane-ammonia dimers using matrix isolation infrared spectroscopy and ab initio computations

2021 ◽  
Author(s):  
Swaroop Chandra ◽  
B. Suryaprasad ◽  
Nagarajan Ramanathan ◽  
Sundararajan Kalyanasundaram
Keyword(s):  
Infrared Spectroscopy ◽  
Ab Initio ◽  
Electron Donor ◽  
Matrix Isolation ◽  
Non Covalent Interactions ◽  
Ab Initio Computations ◽  
Covalent Interactions

The role of nitrogen, the first member of pnicogen group, as an electron donor in hypervalent non-covalent interactions, has been established long ago, while observation of its electron accepting capability...

Strong proton-shared hydrogen bonding in a methyl imidazole⋯HCl complex: evidence from matrix isolation infrared spectroscopy and ab initio computations

2020 ◽  
Vol 44 (17) ◽  
pp. 7116-7128 ◽  
Author(s):  
Shubhra Sarkar ◽  
P. K. Sruthi ◽  
N. Ramanathan ◽  
K. Sundararajan
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectroscopy ◽  
Ab Initio ◽  
Matrix Isolation ◽  
Methyl Imidazole ◽  
Ab Initio Computations

Evidence for proton-shared hydrogen bonding is provided in a methyl imidazole⋯HCl complex using matrix isolation infrared spectroscopy and ab initio computations.

Role of non-covalent interactions in the supramolecular architectures of mercury(ii) diphenyldithiophosphates: An experimental and theoretical investigation

2021 ◽  
Vol 45 (4) ◽  
pp. 2249-2263
Author(s):  
Pretam Kumar ◽  
Snehasis Banerjee ◽  
Anu Radha ◽  
Tahira Firdoos ◽  
Subash Chandra Sahoo ◽  
...  
Keyword(s):  
Theoretical Investigation ◽  
Supramolecular Organization ◽  
Π Interactions ◽  
Supramolecular Architectures ◽  
Non Covalent Interactions ◽  
Covalent Interactions

The H-bond, spodium bond and CH⋯π interactions playing an important role in the supramolecular organization of two mercury(ii) diphenyldithiophosphate complexes have been discussed.

The important role of non-covalent interactions for the vibrational circular dichroism of lactic acid in aqueous solution

2021 ◽  
Author(s):  
Sascha Jähnigen ◽  
Daniel Sebastiani ◽  
Rodolphe Vuilleumier
Keyword(s):  
Lactic Acid ◽  
Circular Dichroism ◽  
Computational Study ◽  
Bulk Water ◽  
Vibrational Circular Dichroism ◽  
Ab Initio Molecular Dynamics ◽  
Non Covalent Interactions ◽  
Circular Dichroïsm ◽  
Covalent Interactions

We present a computational study of vibrational circular dichroism (VCD) in solutions of (S)-lactic acid, relying on ab initio molecular dynamics (AIMD) and full solvation with bulk water. We discuss...

scholarly journals Binding From both sides: TolR and full-length OmpA bind and maintain the local structure of the E. coli cell wall

2018 ◽  
Author(s):  
Alister T. Boags ◽  
Firdaus Samsudin ◽  
Syma Khalid
Keyword(s):  
Cell Wall ◽  
Electrostatic Interactions ◽  
Cell Envelope ◽  
Binding Domain ◽  
Gram Negative Bacteria ◽  
Inner Membrane ◽  
E Coli ◽  
Non Covalent Interactions ◽  
Covalent Interactions

SUMMARYWe present a molecular modeling and simulation study of the of the E. coli cell envelope, with a particular focus on the role of TolR, a native protein of the E. coli inner membrane in interactions with the cell wall. TolR has been proposed to bind to peptidoglycan, but the only structure of this protein thus far is in a conformation in which the putative peptidoglycan binding domain is not accessible. We show that a model of the extended conformation of the protein in which this domain is exposed, binds peptidoglycan largely through electrostatic interactions. We show that non-covalent interactions of TolR and OmpA with the cell wall, from the inner membrane and outer membrane sides respectively, maintain the position of the cell wall even in the absence of Braun’s lipoprotein. When OmpA is truncated to remove the peptidoglycan binding domain, TolR is able to pull the cell wall down towards the inner membrane. The charged residues that mediate the cell-wall interactions of TolR in our simulations, are conserved across a number of species of Gram-negative bacteria.

Non-covalent interactions and their impact on the complexation thermodynamics of noble gases with methanol

2020 ◽  
Vol 22 (30) ◽  
pp. 17171-17180 ◽  
Author(s):  
Lúcio Renan Vieira ◽  
Sandro Francisco de Brito ◽  
Mateus Rodrigues Barbosa ◽  
Thiago Oliveira Lopes ◽  
Daniel Francisco Scalabrini Machado ◽  
...  
Keyword(s):  
Potential Energy ◽  
Ab Initio ◽  
Potential Energy Surfaces ◽  
Noble Gases ◽  
Van Der Waals ◽  
Reliable Information ◽  
Van Der Waals Complexes ◽  
Non Covalent Interactions ◽  
Energy Surfaces ◽  
Covalent Interactions

Accurate ab initio calculations provide the reliable information needed to study the potential energy surfaces that control the non-covalent interactions (NCIs) responsible for the formation of weak van der Waals complexes.

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