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Updated: Jul 14, 2026

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
Published on: November 29, 2018
Ab initio chemical kinetics for the OH+HNCN reaction
1Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA. sxu@emory.edu
This study investigates the reaction between cyanomidyl radical (HNCN) and hydroxyl radical (OH) using advanced computational methods. It predicts reaction rate constants and product distributions crucial for atmospheric chemistry.
Area of Science:
- Chemical Kinetics
- Atmospheric Chemistry
- Computational Chemistry
Background:
- The cyanomidyl radical (HNCN) is a reactive intermediate with implications in atmospheric chemistry.
- Understanding its reactions with radicals like hydroxyl (OH) is vital for atmospheric modeling.
Purpose of the Study:
- To investigate the kinetics and mechanism of the HNCN + OH reaction.
- To predict rate constants and product branching ratios across a wide temperature range.
- To provide data for atmospheric models.
Main Methods:
- Ab initio calculations using CCSD(T) and B3LYP levels of theory.
- Geometry optimization at B3LYP/6-311+G(3df,2p) and CCSD/6-311++G(d,p).
- Rate constant prediction using variational transition-state theory and RRKM theory.
Main Results:
- Total rate constants were derived for temperature ranges 300-1000 K and 1000-3000 K.
- Branching ratios for primary product channels (HON(H)CN, HONCNH, H2O+NCN) were determined.
- Rate constants for specific product channels under various conditions are provided.
Conclusions:
- The study provides crucial kinetic data for the HNCN + OH reaction.
- Predicted rate constants and branching ratios enhance atmospheric chemistry models.
- This research contributes to a better understanding of atmospheric radical reactions.
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