Citation: CI Cheng-Gang, DUAN Xue-Mei, LIU Jing-Yao, SUN Chia-Chung. Photodissociation Mechanism of Cyanogen Azide[J]. Acta Physico-Chimica Sinica, ;2010, 26(10): 2787-2792. doi: 10.3866/PKU.WHXB20100914 shu

Photodissociation Mechanism of Cyanogen Azide

1.
State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry,Jilin University, Changchun 130023, P. R. China

Received Date: 4 May 2010
Available Online: 27 September 2010
Fund Project: 国家自然科学基金(20333050, 20303007, 20973077) 和教育部新世纪优秀人才支持计划(NCET) 资助项目 (20333050, 20303007, 20973077) 和教育部新世纪优秀人才支持计划(NCET)

We investigated the photodissociation mechanism of cyanogen azide (N₃CN) at the MRCI+Q//CAS(10,9)/6-311+G(2df) level of theory using the multi-reference state method. The optimized structures and energies of the minima, transition states, singlet/singlet conical intersection and singlet/triplet crossing points of the ground and low-lying excited states were obtained to explore the potential energy surfaces of N₃CN. The vertical excited energies calculated at the MRCI+Q//CAS(10, 9) level were compared with the experimental data. It is shown that N—N bond fission to form N₂+NCN is the predominant dissociation pathway on the S0, S1, S2, and T1 surfaces whereas the C—N bond fission channel is the minor pathway. The 220 nm absorption peak observed experimentally corresponds to an excitation from the S0 to the S1 state leading to the major photodissociation product NCN[a¹Δ_g]. The 275 nm absorption peak corresponds to the S0-T1 transition leading to the formed ground-state product NCN[X³Σ^-_g ] via the barrierlessly direct dissociation in the T1 state. Our theoretical results agree well with experimental observations.
- Reaction mechanism,
- Cyanogens azide,
- Photodissociation,
- Potential energy surface intersectionpoint
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