Title Page

Abstract

Contents

I. Introduction 10

1.1. Intramolecular charge transfer reactions 10

1.2. Reverse micellar system 11

1.3. Time-resolved electronic spectroscopy 12

1.3.1. Time-Correlated Single Photon Counting (TCSPC) 13

II. Experimental setup 18

2.1. Sample preparation 18

2.2. Steady-state and time-resolved spectral measurements 18

2.3. Data analysis 19

III. Excited state intramolecular charge transfer in reverse micelle 22

3.1. Steady-state absorption and emission measurements. 22

3.2. Time resolved fluorescence measurements. 23

IV. Summary 38

V. Reference 40

Table 3.1. The Wavelength and stokes shift of steady-state absorption and emission of RMs solutions. 29

Table 3.2. The Wavelength and stokes shift of steady-state absorption and emission of RMs solutions. 30

Table 3.3. Kinetic components of all dyes in acetonitrile reverse micelles. 35

Table 3.4. Kinetic components of all dyes in methanol reverse micelles. 36

Table 3.5. The total rate constants of chromophores in bulk solutions and reverse micelles. 37

Figure 1.1. Molecular structure of (a) AMK, (b) MK and (c) EMK. Electron donating groups are highlighted with red box. 14

Figure 1.2. (a) Molecular structure of AOT molecule (b) schematic description of AOT reverse micelles: Self-assembly structure of AOT with inner-polar core and outer-bulk nonpolar solvent. 15

Figure 1.3. The Jablonski diagram of molecular excitation, radiative and non-radiative decay pathways. S0 is the ground singlet electronic state, S₁ is the excited singlet electronic state, S1-...[이미지참조] 16

Figure 1.4. Measurement principle of TCSPC. Reproduced from ref. 47 17

Figure 2.1. The Schematic description of the making process of RM samples. 20

Figure 2.2. The schematic representation of home-built time-correlated single photon counting (TCSPC) setup with excitation light source of 375 nm. 21

Figure 3.1. Absorption and emission spectra of 4,4'-diaminobenzophenone (AMK) in (a) bulk solution and (b) reverse micelles of methanol (black), acetonitrile (red). The excitation at 375... 26

Figure 3.2. Absorption and emission spectra of 4,4'-bis(dimethylamino)benzophenone (MK) in (a) bulk solution and (b) reverse micelles of methanol (black), acetonitrile (red). The... 27

Figure 3.3. Absorption and emission spectra of 4,4'-bis(diethylamino)benzophenone (EMK) in (a) bulk solution and (b) reverse micelles of methanol (black), acetonitrile (red). The... 28

Figure 3.4. Fluorescence kinetics of AMK, MK and EMK in (a) bulk acetonitrile and (b) methanol probed at respective emission maximum with 375 nm excitation 31

Figure 3.5. Contour plots of AMK, MK and EMK in reverse micelles system 32

Figure 3.6. Fluorescence kinetics of dyes in acetonitrile reverse micelles system with 375nm excitation. (a) AMK, (b) MK and (c) EMK 33

Figure 3.7. Fluorescence kinetics of dyes in methanol reverse micelles system with 375nm excitation. (a) AMK, (b) MK and (c) EMK. 34