A computational study on the characteristics of open-shell H-bonding interaction between carbamic acid (NH2COOH) and HO2, HOS or HSO radicals

  • Adnan Ali Khan
  • Mehdi D. Esrafili
  • Aziz Ahmad
  • Emily Hull
  • Rashid AhmadEmail author
  • Saeed Ullah Jan
  • Iftikhar Ahmad
Original Paper


Quantum chemical computations were applied to investigate the characteristics of open-shell hydrogen-bonding interactions in the complexes of carbamic acid (NH2COOH, CA) with HO2, HOS and HSO radicals. All the resulting complexes were studied using the MP2, B3PW91 and B3LYP computational levels and 6311++G** basis set. Geometry optimizations show that the O–H⋯O contact is stronger than N–H⋯O and S–H⋯O. The interaction energies revealed that all the radicals form stronger hydrogen bonded complexes at site-1, as confirmed by electron-density (ρ) and corresponding Laplacian (∇2ρ) values obtained by atoms in molecule (AIM) analysis. Non-covalent interaction and reduced density gradient analysis support the AIM results. Natural bond orbital analysis was employed to obtain the stabilization energies (E(2)) due to charge delocalization between the interacting units. Energy decomposition analysis suggests that, for the title complexes, the exchange energy makes a larger contribution to the total interaction energy compared to other energy terms.

Graphical abstract

Open-shell H-bondinginteraction between carbamic acid (NH2COOH) and HO2, HOS or HSOradicals


Opened-shell hydrogen bonding Ab initio Radical DFT MP2 



We acknowledge the financial support from the Higher Education Commission of Pakistan (HEC), Project No. 20-3959/NRPU/R&D/HEC2014/234.

Supplementary material

894_2019_4070_MOESM1_ESM.docx (3 mb)
ESM 1 (DOCX 3025 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Center for Computational Materials ScienceUniversity of MalakandChakdaraPakistan
  2. 2.Department of ChemistryUniversity of MalakandChakdaraPakistan
  3. 3.Department of Chemistry, Faculty of Basic ScienceUniversity of MaraghehMaraghehIran
  4. 4.CAS Key Laboratory of Carbon MaterialsInstitute of Coal ChemistryTaiyuanPeople’s Republic of China
  5. 5.Eurofins Lancaster LaboratoriesLancasterUSA
  6. 6.Department of PhysicsAbbottabad University of Science and TechnologyHavelianPakistan

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