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实验中铂配合物在溶液里呈现双发射(磷光+荧光)现象,所以分别使用Gaussian与Dalton计算了荧光和磷光的振子强度。但是荧光的振子强度远大于磷光,这与实验以及经验都不符合。
计算过程如下,都没有考虑溶剂效应,元素有CHNOBPt:
- 先用Gaussian优化了基态,泛函为b3lyp,基组为6-311G*+SDD;
- 使用Gaussian优化了S1,泛函为cam-b3lyp,基组保持不变,结果为
- Excited State 1: Singlet-A 2.1282 eV 582.58 nm f=0.0827
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- 在Gaussian中使用UDFT优化了T1,泛函为b3lyp,然后用Dalton计算了磷光速率及振子强度,相关设置如下:
- **DALTON INPUT
- .RUN RESPONS
- **WAVE FUNCTIONS
- .DFT
- CAMB3LYP
- **RESPONS
- *QUADRATIC
- .ECPHOS
- .PRINT
- 3
- .ROOTS
- 5
- **END OF DALTON INPUT
复制代码 对Pt选取赝势基组:Charge=78.0 Atoms=1 Basis=stuttgart_rsc_1997_ecp ECP=stuttgart_rsc_1997_ecp,结果为:- Phosphorescence transition rate from excited state no. 1
- (Triplet->singlet transition, high-temperature limit)
- Transition energy: 1.875 eV
- or 661.334 nm
- Length gauge / effective charge spin-orbit integrals:
- Partial rates (ECSO): X-polarization 5583.3 Transition moment : 2.823E-02
- Length gauge / effective charge spin-orbit integrals:
- Partial rates (ECSO): Y-polarization 15551. Transition moment : 4.712E-02
- Length gauge / effective charge spin-orbit integrals:
- Partial rates (ECSO): Z-polarization 9890.4 Transition moment : 3.758E-02
- Phosphorescence - length gauge / effective charge spin-orbit integrals:
- Oscillator strength (/2PI) (ECSO) <b>3.237574E-05</b>
- Dipole strength [a.u.] (ECSO) 4.428900E-03
- Dipole strength E-40 [esu**2 cm**2] 2.861280E+02
- Total transition rate (ECSO) 1.034140E+04 s-1
- Total phosphorescence lifetime (ECSO) 9.669873E-05 s
- Phosphorescence transition rate from excited state no. 2
- (Triplet->singlet transition, high-temperature limit)
- Transition energy: 2.400 eV
- or 516.524 nm
- Length gauge / effective charge spin-orbit integrals:
- Partial rates (ECSO): X-polarization 8.24204E+05 Transition moment : 0.237
- Length gauge / effective charge spin-orbit integrals:
- Partial rates (ECSO): Y-polarization 3.81614E+05 Transition moment : 0.161
- Length gauge / effective charge spin-orbit integrals:
- Partial rates (ECSO): Z-polarization 9475.2 Transition moment : 2.539E-02
- Phosphorescence - length gauge / effective charge spin-orbit integrals:
- Oscillator strength (/2PI) (ECSO) <b>7.736424E-04</b>
- Dipole strength [a.u.] (ECSO) 8.265828E-02
- Dipole strength E-40 [esu**2 cm**2] 5.340117E+03
- Total transition rate (ECSO) 4.050977E+05 s-1
- Total phosphorescence lifetime (ECSO) 2.468540E-06 s
- Phosphorescence transition rate from excited state no. 3
- (Triplet->singlet transition, high-temperature limit)
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Dalton计算的磷光发射波长与Gaussian基本一致。
请各位老师帮忙看下是计算过程存在问题,还是两个软件的结果不能一起比较?
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