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Exploring the nature of silicon-noble gas bonds in H3SiNgNSi and HSiNgNSi compounds (Ng = Xe, Rn).

Authors
  • Pan, Sudip1
  • Saha, Ranajit2
  • Chattaraj, Pratim K3
  • 1 Department of Chemistry and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India. [email protected] , (India)
  • 2 Department of Chemistry and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India. [email protected] , (India)
  • 3 Department of Chemistry and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India. [email protected] , (India)
Type
Published Article
Journal
International Journal of Molecular Sciences
Publisher
MDPI AG
Publication Date
Mar 19, 2015
Volume
16
Issue
3
Pages
6402–6418
Identifiers
DOI: 10.3390/ijms16036402
PMID: 25809612
Source
Medline
License
Unknown

Abstract

Ab initio and density functional theory-based computations are performed to investigate the structure and stability of H3SiNgNSi and HSiNgNSi compounds (Ng = Xe, Rn). They are thermochemically unstable with respect to the dissociation channel producing Ng and H3SiNSi or HSiNSi. However, they are kinetically stable with respect to this dissociation channel having activation free energy barriers of 19.3 and 23.3 kcal/mol for H3SiXeNSi and H3SiRnNSi, respectively, and 9.2 and 12.8 kcal/mol for HSiXeNSi and HSiRnNSi, respectively. The rest of the possible dissociation channels are endergonic in nature at room temperature for Rn analogues. However, one three-body dissociation channel for H3SiXeNSi and one two-body and one three-body dissociation channels for HSiXeNSi are slightly exergonic in nature at room temperature. They become endergonic at slightly lower temperature. The nature of bonding between Ng and Si/N is analyzed by natural bond order, electron density and energy decomposition analyses. Natural population analysis indicates that they could be best represented as (H3SiNg)+(NSi)- and (HSiNg)+(NSi)-. Energy decomposition analysis further reveals that the contribution from the orbital term (ΔEorb) is dominant (ca. 67%-75%) towards the total attraction energy associated with the Si-Ng bond, whereas the electrostatic term (ΔEelstat) contributes the maximum (ca. 66%-68%) for the same in the Ng-N bond, implying the covalent nature of the former bond and the ionic nature of the latter.

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