Quantum chemical replica-exchange umbrella sampling molecular dynamics simulations reveal the formation mechanism of iron phthalocyanine from iron and phthalonitrile
Abstract
Phthalocyanine (Pc) and its metal complexes (MPcs) have been used industrially since their discovery in the early 20th century. The phthalonitrile (PN) method is a well-known synthesis method in which Pc or MPc can be afforded by heating a mixture of PN and metal powders over 280 °C with only moderate yield. However, the formation mechanism of the phthalocyanines and the intermediate stages of this seemingly simple reaction have yet to be fully understood. To study this mechanism computationally, we carried out quantum chemical molecular dynamics (MD) simulations based on the density-functional tight-binding (DFTB) method, applying the replica-exchange umbrella sampling (REUS) method, starting from four PN molecules and one iron atom. The DFTB-REUS-MD simulations successfully yielded FePc, and a metastable structure very similar to FePc but with a reactive nitrene unit was also identified that might explain the incomplete conversion of the reactants into FePc. Furthermore, analysis of the MD trajectories reveals a three-step FePc formation mechanism for the PN method.
- Authors:
-
- Nagoya Univ., Nagoya (Japan)
- Nagoya Univ., Nagoya (Japan); Chinese Academy of Sciences, Changchun (People's Republic of China)
- Nagoya Univ., Nagoya (Japan); JST-CREST, Nagoya (Japan)
- Nagoya Univ., Nagoya (Japan); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1474873
- Alternate Identifier(s):
- OSTI ID: 1460501
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 149; Journal Issue: 7; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; phthalocyanine; phthalonitrile; density-functional tight-binding; replica-exchange umbrella sampling; formation mechanism
Citation Formats
Ito, Shingo, Wang, Ying, Okamoto, Yuko, and Irle, Stephan. Quantum chemical replica-exchange umbrella sampling molecular dynamics simulations reveal the formation mechanism of iron phthalocyanine from iron and phthalonitrile. United States: N. p., 2018.
Web. doi:10.1063/1.5026956.
Ito, Shingo, Wang, Ying, Okamoto, Yuko, & Irle, Stephan. Quantum chemical replica-exchange umbrella sampling molecular dynamics simulations reveal the formation mechanism of iron phthalocyanine from iron and phthalonitrile. United States. https://doi.org/10.1063/1.5026956
Ito, Shingo, Wang, Ying, Okamoto, Yuko, and Irle, Stephan. Mon .
"Quantum chemical replica-exchange umbrella sampling molecular dynamics simulations reveal the formation mechanism of iron phthalocyanine from iron and phthalonitrile". United States. https://doi.org/10.1063/1.5026956. https://www.osti.gov/servlets/purl/1474873.
@article{osti_1474873,
title = {Quantum chemical replica-exchange umbrella sampling molecular dynamics simulations reveal the formation mechanism of iron phthalocyanine from iron and phthalonitrile},
author = {Ito, Shingo and Wang, Ying and Okamoto, Yuko and Irle, Stephan},
abstractNote = {Phthalocyanine (Pc) and its metal complexes (MPcs) have been used industrially since their discovery in the early 20th century. The phthalonitrile (PN) method is a well-known synthesis method in which Pc or MPc can be afforded by heating a mixture of PN and metal powders over 280 °C with only moderate yield. However, the formation mechanism of the phthalocyanines and the intermediate stages of this seemingly simple reaction have yet to be fully understood. To study this mechanism computationally, we carried out quantum chemical molecular dynamics (MD) simulations based on the density-functional tight-binding (DFTB) method, applying the replica-exchange umbrella sampling (REUS) method, starting from four PN molecules and one iron atom. The DFTB-REUS-MD simulations successfully yielded FePc, and a metastable structure very similar to FePc but with a reactive nitrene unit was also identified that might explain the incomplete conversion of the reactants into FePc. Furthermore, analysis of the MD trajectories reveals a three-step FePc formation mechanism for the PN method.},
doi = {10.1063/1.5026956},
journal = {Journal of Chemical Physics},
number = 7,
volume = 149,
place = {United States},
year = {Mon Jul 16 00:00:00 EDT 2018},
month = {Mon Jul 16 00:00:00 EDT 2018}
}
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