Acta Physica Sinica, Volume. 69, Issue 2, 023101-1(2020)

Density functional theory calculation of spectrum and excitation properties of mer-Alq3

Jie Peng... Si-Jie Zhang*, Ke Wang and Martin Dove |Show fewer author(s)
Figures & Tables(12)
Structure of the mer-Alq3 molecule.mer-Alq3的分子结构
Infrared absorption spectrum of mer-Alq3.mer-Alq3分子的红外光谱
Raman spectrum of mer-Alq3.mer-Alq3的拉曼光谱
Frontier molecular orbits of mer-Alq3: (a) HOMO-2 distribution; (b) HOMO-1 distribution; (c) HOMO distribution; (d) LUMO distribution; (e) LUMO+1 distribution; (f) LUMO+2 distribution.mer-Alq3前线分子轨道分布图 (a) HOMO-2轨道分布图; (b) HOMO-1轨道分布图; (c) HOMO轨道分布图; (d) LUMO轨道分布图; (e) LUMO+1轨道分布图; (f) LUMO+2轨道分布图
UV-Vis absorption spectrum of mer-Alq3.mer-Alq3分子的紫外-可见吸收光谱
Electron-hole, Chole-Cele and Sr distributions of mer-Alq3 respectively: (a)−(c) Electron-hole, Chole-Cele,Sr distribution at S2 state geometry; (d)−(f) Electron-hole, Chole-Cele,Sr distribution at S4 state geometry; (g)−(i) Electron-hole, Chole-Cele,Sr distribution at S11 state geometry; (j)−(l) Electron-hole, Chole-Cele,Sr distribution at S14 state geometrymer-Alq3的空穴-电子、Chole-Cele、Sr示意图 (a)−(c) S2的空穴-电子, Chole-Cele,Sr图; (d)−(f) S4的空穴-电子, Chole-Cele,Sr图; (g)−(i) S11的空穴-电子, Chole-Cele,Sr图; (j)−(l) S14的空穴-电子, Chole-Cele,Sr图
  • Table 1.

    Bond lengths of the mer-Alq3.

    mer-Alq3分子的键长

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    Table 1.

    Bond lengths of the mer-Alq3.

    mer-Alq3分子的键长

    BondB3LYP/6-31G*/ÅExperimental results/Å[21]
    Al-Na2.083772.0502
    Al-Nb2.125652.0872
    Al-Nc2.064312.0172
    Al-Oa1.855451.8502
    Al-Ob1.881061.8602
    Al-Oc1.883981.8572
  • Table 2.

    Identification of partial vibration modes of mer-Alq3.

    mer-Alq3分子中部分振动模式指认

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    Table 2.

    Identification of partial vibration modes of mer-Alq3.

    mer-Alq3分子中部分振动模式指认

    Vexperiment/cm–1Vtheory/cm–1Vibration analysisVexperiment/cm–1Vtheory/cm–1Vibration analysis
    398408分子骨架扭曲变形12281268C—N伸缩振动, C—H平面摇摆振动, 剪式振动
    416422分子骨架扭曲变形, 环1环2环5 环6上C—H平面摇摆振动, 环3环4上C—H扭曲振动12801334C—O, C—C伸缩振动, C—H平面摇摆振动
    457470C—H扭曲振动13281376C—H平面摇摆振动, 剪式振动
    548554Al-O50伸缩振动, 环1环2呼吸振动13831422C—C伸缩振动, C—H平面摇摆振动
    642662Al-O50伸缩振动, C—H扭曲振动14241438C—N、C—C伸缩振动, C—H 平面摇摆振动, 剪式振动
    746768Al-O面外弯曲振动, 环3环4呼吸 振动 14681512C—N伸缩振动, C—C伸缩振动, C—H平面摇摆振动
    787796C—H扭曲振动14991550C—C伸缩振动, C—H平面摇摆振动
    803820苯环和吡啶环变形振动15791636C—N伸缩振动, C—C伸缩振动, C—H平面摇摆振动, 剪式振动
    823836C—H面外摇摆振动16061658C—N伸缩振动, C—C伸缩振动, C—H平面摇摆振动, 剪式振动
    11141140C—H剪式振动30393202苯环上C—H伸缩振动
  • Table 3.

    Identification of partial vibration modes of mer-Alq3.

    mer-Alq3分子中部分振动模式指认

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    Table 3.

    Identification of partial vibration modes of mer-Alq3.

    mer-Alq3分子中部分振动模式指认

    Vexperiment/cm–1Vtheory/cm–1Vibration analysis
    507508Al—O扭曲振动, 苯环和吡啶环变形振动
    529530Al—O伸缩振动, 苯环和吡啶环呼吸振动
    545554Al—O伸缩振动, 苯环和吡啶环呼吸振动
    581586Al—O扭曲振动, 苯环和吡啶环变形振动
    760768Al—O伸缩振动, 苯环和吡啶环呼吸振动
    10621086C—H平面摇摆振动, 剪式振动
    11771172C—H平面摇摆振动, 剪式振动
    13931422C—O, C—C伸缩振动, C—H平面摇摆振动, 剪式振动
    1438C—N、C—C伸缩振动, C—H平面摇摆振动, 剪式振动
    15931638C—C伸缩振动, C—H平面摇摆振动, 剪式振动
    3216C—H伸缩振动
  • Table 4.

    Frontier molecular orbital energy levels (in arb.units) and distribution (in %) of mer-Alq3.

    mer-Alq3的前线分子轨道能级(单位: arb.units)及分布(单位: %)

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    Table 4.

    Frontier molecular orbital energy levels (in arb.units) and distribution (in %) of mer-Alq3.

    mer-Alq3的前线分子轨道能级(单位: arb.units)及分布(单位: %)

    分子轨道能级Alabc
    O吡啶O吡啶O吡啶
    H-2–0.195841.510.160.850.9320.3664.5919.940.240.741.15
    H-1–0.192041.572.058.502.560.361.181.1717.1958.3017.72
    H–0.183971.4719.2557.5217.840.360.200.243.587.262.42
    L–0.063631.600.060.180.911.6625.2864.810.294.5512.18
    L+1–0.054961.360.628.4120.900.243.247.251.3319.6447.98
    L+2–0.052181.281.7221.5756.030.541.835.130.816.3216.59
  • Table 5.

    The analysis of electron excitation of mer-Alq3.

    mer-Alq3分子的电子激发分析表

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    Table 5.

    The analysis of electron excitation of mer-Alq3.

    mer-Alq3分子的电子激发分析表

    Excited stateλ/nm fTransition nature (contribution > 10%)Transition energy/eV
    2427.150.0672119→121 (45.9956%); 119→122 (23.0683%); 118→120 (21.1263%) 2.9026
    4417.310.0425117→120 (88.1022%)2.9710
    11304.030.0151119→124 (38.2445%); 119→125 (23.0208%)4.0781
    12302.870.0214117→123 (66.2078%); 114→120 (20.1638%)4.0937
  • Table 6.

    Excited state parameters of mer-Alq3.

    mer-Alq3分子的激发态参数

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    Table 6.

    Excited state parameters of mer-Alq3.

    mer-Alq3分子的激发态参数

    DSr/arb.units Ht
    S0 → S20.180.613.570.12
    S0 → S40.990.592.950.41
    S0 → S110.880.793.84–1.38
    S0 → S140.680.433.472.00
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Jie Peng, Si-Jie Zhang, Ke Wang, Martin Dove. Density functional theory calculation of spectrum and excitation properties of mer-Alq3[J]. Acta Physica Sinica, 2020, 69(2): 023101-1

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Paper Information

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Received: Sep. 23, 2019

Accepted: --

Published Online: Nov. 9, 2020

The Author Email:

DOI:10.7498/aps.69.20191453

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