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采用密度泛函(DFT)B3LYP/6-311g(d)对C5F10O分子进行几何结构优化, 研究外加电场(0-0.03 a.u., 1 a.u. = 5.142 × 1011 V/m)对分子的几何结构、能量、前线轨道能级、红外光谱的影响. 在相同基组下, 采用TD-DFT方法计算和分析C5F10O的轨道成分和激发特性. 研究表明: 随着电场增加, 5C—15F与4C=16O键能逐渐减小, 键长增大; 13F原子的电荷布居数变化最快, 更容易在外电场力的作用下失去电子; 分子体系势能不断增加, 稳定性逐渐减低; 能隙EG值不断减小, 分子更容易激发到激发态参与到化学反应中. 红外光谱中, 4个吸收峰发生蓝移, 4个吸收峰发生了红移. 使用空穴-电子分析法, 指认了C5F10O分子前8个单重激发态的激发特征. 第一激发态的激发能微小增长, 波长减小, 出现蓝移; 其余激发态的激发能均降低, 波长均变长, 发生红移, 导致C5F10O分子中的电子变得越来越容易激发, 体系的稳定程度减小.In this paper, we use the density functional theory (B3LYP) method with 6-311g(d) basis sets to optimize the molecular structure of C5F10O and obtain the stable structure of its ground state. On this basis, the geometric characteristics, energy, frontier orbital energy levels, and infrared spectra of C5F10O under the different external electric fields (from 0 to 0.03 a.u., 1 a.u. = 5.142 × 1011 V/m) are studied by the same method. Under the same basis sets, the orbital composition and excitation characteristics of C5F10O are calculated and analyzed by the TD-DFT method. The conclusions show that as the electric field increases, the bond energy of 5C—15F and 4C=16O gradually decrease, their bond lengths increase. The charge of 13F atoms changes fastest, and it is easier to lose electrons under the action of electric field force. The potential energy of the molecule increases, and the stability gradually decreases. The energy gap EG value continuously decreases, and the molecules are more likely to be excited to participate in the chemical reaction. In the infrared spectrum, four absorption peaks are blue-shifted, and four absorption peaks are red-shifted. The excitation characteristics of the first 8 singlet excited states of the C5F10O are identified by the hole-electron analysis method. The excitation energy of the first excited state increases slightly, and the wavelength decreases, and blue shift occurs. The excitation energy values of the other excited states decrease, their wavelengths increase, and red shifts occur. Because the electrons in C5F10O become easier to excite, the stability of the system is lower.
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Keywords:
- C5F10O /
- density functional theory /
- external electric field /
- excited state
[1] 周安春, 高理迎, 冀肖彤, 张名 2018 电网技术 42 3429
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图 6 能量随电场强度的变化 (a), (b), (c)分别是总能量、动能和势能随电场强度的变化
Fig. 6. Variation of energy of C5F10O at different electric field. Panels (a), (b), and (c) are changes of total energy, kinetic energy, and potential energy at different electric field.
图 9 不同电场强度下C5F10O的红外光谱
Fig. 9. Infrared spectrum of C5F10O at different electric field.
图 10 C5F10O前8个单重激发态的电子跃迁图(等值面为0.02)
Fig. 10. Electron transition of first 8 single-excited states of C5F10O (value = 0.02).
图 11 C5F10O第5个单重激发态的电子跃迁图(等值面为0.01)
Fig. 11. Electron transition of the 5 single-excited states of C5F10O (value = 0.01).
表 1 C5F10O分子键长与文献值的对比
Table 1. The bond length of C5F10O compared with the reference
Contrast R(4, 16)/nm R(5, 15)/nm R(3, 4)/nm R(3, 12)/nm R(4, 5)/nm Reference 0.117000 0.130600 0.154000 0.132800 0.153900 Theoretical calculation 0.119086 0.132933 0.155896 0.135497 0.155892 Relative error/% 1.783 0.1786 1.231 2.030 1.294 
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表 2 不同电场强度下C5F10O的前线轨道能级
Table 2. Frontier orbital energy levels of C5F10O at different electric field.
F/a.u. EL/eV EH/eV EG/eV 0.000 –3.197 –8.968 5.771 0.003 –3.260 –9.021 5.760 0.006 –3.324 –9.073 5.748 0.009 –3.388 –9.123 5.735 0.012 –3.453 –9.172 5.719 0.015 –3.517 –9.219 5.702 0.018 –3.583 –9.265 5.683 0.021 –3.649 –9.310 5.661 0.024 –3.715 –9.353 5.638 0.027 –3.783 –9.395 5.612 0.030 –3.852 –9.435 5.582
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表 3 C5F10O前8个单重激发态的激发特性
Table 3. Excitation characteristics of first 8 singlet-excited states of C5F10O.
Excited State D/Å t/Å EC/eV Orbital-Contribution (hole) Orbital-Contribution (electron) S(0) → S(1) 0.267 –0.700 9.775374 MO 64-95.39% MO 65-99.352% S(0) → S(2) 1.723 0.648 6.741638 MO 63-78.436% MO 65-98.828% S(0) → S(3) 0.570 –0.355 8.394609 MO 55-13.986% MO 57-44.649%, MO 65-99.139% S(0) → S(4) 1.135 –0.139 6.968679 MO 52-19.354% MO 55-17.810% MO 62-28.358%, MO 65-99.049% S(0) → S(5) 1.144 –0.300 7.015306 MO 64-86.457% MO 66-84.652% S(0) → S(6) 1.862 0.879 6.505353 MO 60-34.078% MO 61-55.521% MO 65-91.502% S(0) → S(7) 1.601 0.566 6.600581 MO 56-19.786% MO 58-16.594% MO 59-30.422% MO 65-96.849% S(0) → S(8) 0.948 –0.079 6.641575 MO 55-33.730% MO 57-21.883% MO 62-22.257% MO 65-99.078%
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表 4 不同电场强度下C5F10O前8个单重激发态的激发能
Table 4. Excitation energy of first 8 singlet-excited states of C5F10O at different electric field.
F/a.u. Eex/eV 0.000 0.003 0.006 0.009 0.012 0.015 0.018 0.021 0.024 0.027 0.030 n = 1 4.041 4.052 4.063 4.072 4.078 4.086 4.091 4.095 4.097 4.097 4.095 n = 2 7.324 7.283 7.240 7.195 7.148 7.099 7.048 6.996 6.940 6.883 6.823 n = 3 8.427 8.400 8.368 8.329 8.283 8.210 8.089 7.963 7.833 7.700 7.565 n = 4 8.691 8.651 8.560 8.451 8.336 8.236 8.168 8.087 7.980 7.853 7.719 n = 5 8.715 8.673 8.618 8.567 8.499 8.397 8.277 8.154 8.041 7.935 7.823 n = 6 8.776 8.759 8.787 8.693 8.588 8.509 8.444 8.381 8.307 8.208 8.098 n = 7 9.019 8.919 8.811 8.814 8.770 8.663 8.553 8.446 8.351 8.283 8.225 n = 8 9.159 9.076 8.983 8.883 8.826 8.772 8.682 8.583 8.481 8.378 8.277
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表 5 不同电场强度下C5F10O前8个单重激发态的波长
Table 5. Wavelength of first 8 singlet-excited states of C5F10O at different electric field.
F/a.u. λ/nm 0.000 0.003 0.006 0.009 0.012 0.015 0.018 0.021 0.024 0.027 0.030 n = 1 306.80 305.93 305.16 304.48 303.89 303.41 303.04 302.78 302.64 302.63 302.75 n = 2 169.28 170.24 171.25 172.32 173.45 174.64 175.90 177.23 178.64 180.13 181.71 n = 3 147.12 147.60 148.17 148.85 149.68 151.01 153.27 155.71 158.29 161.02 163.88 n = 4 142.65 143.31 144.84 146.72 148.73 150.54 151.79 153.31 155.36 157.87 160.62 n = 5 142.27 142.96 143.86 144.72 145.89 147.65 149.80 152.05 154.18 156.26 158.48 n = 6 141.28 141.55 141.10 142.63 144.37 145.72 146.83 147.94 149.25 151.05 153.10 n = 7 137.48 139.02 140.72 140.66 141.37 143.12 144.96 146.80 148.47 149.69 150.75 n = 8 135.37 136.61 138.03 139.57 140.47 141.34 142.80 144.45 146.19 147.98 149.79
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表 6 不同电场强度下C5F10O前8个单重激发态的振子强度
Table 6. Oscillator strength of first 8 singlet-excited states of C5F10O at different electric field.
F/a.u. f 0.000 0.003 0.006 0.009 0.012 0.015 0.018 0.021 0.024 0.027 0.030 n = 1 0.0002 0.0002 0.0002 0.0002 0.0002 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 n = 2 0.0033 0.0032 0.0030 0.0029 0.0028 0.0026 0.0026 0.0025 0.0024 0.0024 0.0024 n = 3 0.0015 0.0020 0.0025 0.0030 0.0035 0.0039 0.0044 0.0045 0.0045 0.0045 0.0044 n = 4 0.0014 0.0012 0.0024 0.0035 0.0042 0.0048 0.0053 0.0055 0.0052 0.0052 0.0055 n = 5 0.0591 0.0027 0.0039 0.0049 0.0073 0.0083 0.0080 0.0086 0.0102 0.0117 0.0131 n = 6 0.0162 0.0738 0.0641 0.0066 0.0024 0.0005 0.0004 0.0004 0.0023 0.0047 0.0047 n = 7 0.0180 0.0127 0.0148 0.0570 0.0098 0.0101 0.0107 0.0104 0.0078 0.0048 0.0054 n = 8 0.0013 0.0008 0.0039 0.0094 0.0276 0.0078 0.0126 0.0170 0.0203 0.0228 0.0236
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[1] 周安春, 高理迎, 冀肖彤, 张名 2018 电网技术 42 3429
Zhou A C, Gao L Y, Ji X T, Z M 2018 Power Syst Technol 42 3429
[2] Deng Y K, Xiao D M, Chen J 2013 High Voltage Eng 39 2288
[3] Chen X, Yang P Y, Ge G W, Wu Q L, Xie W 2019 Plasma Sci. Technol 21 83
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Google Scholar
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[7] 张晓星, 田双双, 肖淞, 李祎 2018 电工技术学报 33 2883
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[8] 肖登明 2016 高压技术 42 1035
Xiao D M 2016 High Voltage Eng 42 1035
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Tang Q Y, Yao S M 2018 Organo-Fluorine Industry 4 37
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[11] Simka P, Ranjan N 2015 19 th International Symposium on High Voltage Engineering Pilsen Czech Republic, August 23-28
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[15] Märt A, Indrek J, Matti L, Peeter P, Jüri R 2018 J Phys D Appl Phys 51 135205
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Li X W, Deng Y K, Jiang X, Zhao H, Zhuo R, Wang D B, Fu M L 2017 High Voltage Eng 43 708
[18] 邓云坤, 马仪, 王达达, 郭泽, 李兴文, 赵虎 2018 电器与能效管理技术 10 40
Deng Y K, Ma Y, Wang D D, Guo Z, Li X W, Zhao H 2018 Electr. Ene Manag Technol 10 40
[19] 马仪, 邓云坤 2018 广东电力 31 44
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