ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Molecular structure, FT-IR and NMR analyses of dihydrogen-bonded B₃N₃H₆···HM complexes: a DFT and MP2 approach

Parimala Devi Duraisamy, Praveena Gopalan, and Abiram Angamuthu

Department of Physics, Karunya Institute of Technology and Sciences, Coimbatore, India

E-mail: aabiram@gmail.com

Received: 9 July 2019  Accepted: 26 November 2019

Abstract:

A theoretical study on the intermolecular dihydrogen bonding (DHB) of ground state B₃N₃H₆···HM (Li, Na, and K) complexes were investigated by B3LYP and MP2 methods with 6-311++G** basis set. Thermodynamic parameters (entropy, enthalpy, heat capacity and Gibbs free energy) of the complexes were calculated at different temperatures in the gas phase. The vibrational analysis of N–H···H–M DHB bond formation reveals that the calculated N–H and M–H stretching frequencies undergo red and blue shifts, respectively. The calculated interaction energies correlate well with the geometrical parameters wherein the shortest H···H intermolecular distance is obtained for B₃N₃H₆···HK complex. The chemical shift of ¹H, ¹¹B and ¹⁵N NMR predict large variation for B₃N₃H₆···HK complex which has large protonic hydrogen than the hydridic hydrogen. Furthermore, natural bond orbital and quantum theory of atoms in molecule analyses were carried out to explore the non-covalent interaction along with the molecular electrostatic potential to predict the reactive sites of electrophilic and nucleophilic attack.

Graphic Abstract:

Keywords: Dihydrogen bond; DFT; MP2; Borazine; Metal hydrides; Molecular electrostatic potential

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-019-01011-5

Chemical Papers 74 (5) 1609–1619 (2020)