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Structures and stability of isomers of [Si,N,N,P] system

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Abstract

Some stationary points on the potential energy surface of [Si, N, N, P] system were located at the B3LYP/6-311G(d) and QCISD(t)/6-311+G(2df)(single-point) levels of theory, while the isomerization, structures, and stability of these obtained isomers were suggested. The computed results indicate that only four-membered ring isomer SiNPN(E1, 2A"), which possesses butterfly-like structure and Si-P cross bonding, is kinetically stable in all optimized isomers. Other isomers may be considered as kinetically unstable towards isomerization or dissociation because of the corresponding smaller reaction barriers. Furthermore, the present paper also proposes electronic and geometric structures, vibrational frequencies and the corresponding vibrational modes, dipole moments, and rotational constants of isomer E1. To make use of the computed results, we can clearly know that the reaction pathway via an intermediate E3 (SiNPN) is the most favorable channel producing isomer E1 from fragments SiN(2Π) and PN (1Σ), which have been well characterized in space, and thus, isomer E1 can be considered as a candidate for interstellar observation. The reaction enthalpy of SiN(2Π) + PN(1Σ)→ E1 and the standard enthalpy of formation of isomer E1 are 215.25 and 457.99 kJ/mol, respectively, at 298.15 K.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Heilongjiang University, 150080, Harbin, China

    Wei Kan, Haitao Yu, Mingxia Li, Honggang Fu & Jiazhong Sun

  2. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, 130023, Changchun, China

    Honggang Fu & Jiazhong Sun

Authors
  1. Wei Kan
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  2. Haitao Yu
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  3. Mingxia Li
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  4. Honggang Fu
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  5. Jiazhong Sun
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Correspondence to Honggang Fu.

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Kan, W., Yu, H., Li, M. et al. Structures and stability of isomers of [Si,N,N,P] system. Sc. China Ser. B-Chem. 47, 98–105 (2004). https://doi.org/10.1360/03yb0126

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  • DOI: https://doi.org/10.1360/03yb0126

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