Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 114, Issue 18, Pages 5862-5869Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9122002
Keywords
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Funding
- Japan Society for the Promotion of Science [18066013, 18GS0207, 21750063]
- Kyushu University
- Nanotechnology Support Project
- Ministry of Culture, Sports, Science, and Technology of Japan (MEXT)
- CREST of the Japan Science and Technology Cooperation
- Grants-in-Aid for Scientific Research [21750063] Funding Source: KAKEN
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The spin transition between the low-spin singlet state and the high-spin quintet state in the [Fe(2-pic)(3)](2+) (2-pic: 2-picolylamine) complex is studied by using density functional theory (DFT) calculations. After careful comparison of density functionals BLYP, B3LYP, and B3LYP* (which has 15% Hartree-Fock exchange compared with 20% for B3LYP), we concluded that the spin-state splitting can be accurately reproduced by using the B3LYP* functional. The potential energy surfaces along minimum energy pathways of the three spin states were calculated at the B3LYP*/6-311+G** level of theory to find minimum energy crossing points (MECPs). The MECPs between the singlet and quintet states (SQ(M)) were found (E-SQ = 6.8 kcal/mol), as well as the MECPs between the triplet and singlet states (STM, E-ST = 12.9 kcal/mol) and the triplet and quintet states (TQ(M), E-TQ = 12.8 kcal/mol). Although the distortion leading to SQ(M) from the singlet equilibrium geometry is mainly a symmetric expansion of the Fe-N bonds, the distortions leading to STM and SQ(M) are asymmetric. Normal mode analysis demonstrates that these geometrical distortions contain a combination of several low-frequency normal modes, and therefore, these modes play a significant role in the intersystem crossing via the crossing seam.
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