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Nonlinear Optical Crystals with Asymmetric Electron Donating Groups for Efficient Terahertz Wave Generation

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Ι. Introduction 1
II. Experiments 4
II.1. Molecular Structure 4
II.1.1. Molecular Structure of 3PM Donor-Based Compounds 4
II.1.2. Molecular Structure of PB-7ClQ-Based Compounds 5
II.1.3. Molecular Structure of Benzothiazolium-Based Compounds 6
II.2. Synthesis 7
II.2.1. Materials 7
II.2.2. Synthesis of 3PM Donor-Based Compounds 8
II.2.3. Synthesis of PB-7ClQ-Based Compounds 9
II.2.4. Synthesis of Benzothiazolium-Based Compounds 10
II.3. General Characterization 11
II.3.1. NMR Measurement 11
II.3.1.1. 1H and 13C NMR Results of 3PM Donor-Based Compounds 11
II.3.1.2. 1H and 13C NMR Results of PB-7ClQ-Based Compounds 19
II.3.1.3. 1H and 13C NMR Results of Benzothiazolium-Based Compounds 23
III. Results and Discussion 35
III.1. Design of New Organic Nonlinear Optical Crystals 35
III.2. Qualitative Second Harmonic Generation (SHG) Test 37
III.3. UV-Visible Absorption Analysis of 3PM Donor-Based Compounds 39
III.4. Crystal Characteristics of 3PM Donor-Based Crystals 41
III.4.1. Crystal Growth of 3PM Donor-Based Crystals 41
III.4.2. Crystal Structure Analysis of 3PM Donor-Based Crystals 43
III.5. Crystal Characteristics of PB-7ClQ-BBS 45
III.5.1. Crystal Growth of PB-7ClQ-BBS 45
III.5.2. Crystal Structure Analysis of PB-7ClQ-BBS 47
III.6. UV-Visible Absorption Analysis of Benzothiazolium-Based Compounds 52
III.7. Crystal Characteristics of Benzothiazolium-Based Crystals 54
III.7.1. Crystal Growth of Benzothiazolium-Based Crystals 54
III.7.2. Crystal Structure Analysis of Benzothiazolium-Based Crystals 56
III.8. Macroscopic Optical Nonlinearity of PB-5FB-T Crystal 60
III.9. THz Wave Generation Experiment of PB-5FB-T Crystal 62
IV. Conclusions 65
V. References 67

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