Fluorescence Enhancement of Unconstrained GFP Chromophore Analogues Based on the Push-Pull Substituent Effect

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1 Fluorescence Enhancement of Unconstrained GFP Chromophore Analogues Based on the Push-Pull Substituent Effect Meng-Shiue Tsai,, Chun-Lin Ou, Chi-Jui Tsai, Yen-Chin Huang, Yuan-Chung Cheng,*, Shih-Sheng Sun,*, and Jye-Shane Yang*, Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan and Supporting Information (62 pages) S1 Table of Contents S2 Figure S1. DFT-optimized structures of 1 4. S3 Figure S2. Solvatofluorochromic plots for 1 4. S4 Figure S3. Shape and relative energy of the frontier molecular orbitals HOMO and LUMO of 1 4. S5 Figure S4. Photographic images of fluorescence quenching induced by the electron donor trimethylamine and H-bond donors methanol and 10% water in THF for 2 4 (excited by 366 nm of a hand-help UV lamp). S6 Figure S5. Methanol titration experiments and Stern-Volmer plots for 2 4 in acetonitrile. S7 Figure S6. Triethylamine titration experiments and Stern-Volmer plots for 2 4 in acetonitrile. S8 Figure S7. Triethanolamine titration experiments and Stern-Volmer plots for 2 4 in acetonitrile. S9-S42 Figure S8-S41. 1 H- and 13 C-NMR spectra of new compounds. S43- Table S1. DFT (M06-2X/6-31+G(d))-Derived Cartesian Coordinates of S50 Ground-State Structures of 1 4. S51- Table S2. TDDFT (M06-2X/6-31+G(d))-Derived Cartesian Coordinates S62 of Excited-State Structures of 1 4. S1

2 Figure S1. DFT-optimized structures (front and side views) of (a) 1, (b) 2, (c) 3, and (d) 4 calculated at the M06-2X/6-31+G(d) level. S2

3 Figure S2. Solvatofluorochromic plots for (a) 1, (b) 2, (c) 3, and (d) 4. S3

4 Figure S3. Shape and relative energy of the frontier molecular orbitals HOMO and LUMO of 1 4. S4

5 Figure S4. Photographic images of fluorescence quenching induced by the electron donor trimethylamine and H-bond donors methanol and 10% water in THF for (a) 2, (b) 3 and (c) 4 (excited by 366 nm of a hand-help UV lamp). S5

6 Figure S5. Methanol titration experiments and Stern-Volmer plots for (a) 2, (b) 3, and (c) 4 in acetonitrile. S6

7 Figure S6. Triethylamine titration experiments and Stern-Volmer plots for (a) 2, (b) 3, and (c) 4 in acetonitrile. S7

8 Figure S7. Triethanolamine titration experiments and Stern-Volmer plots for (a) 2, (b) 3, and (c) 4 in acetonitrile. S8

9 Figure S8. 1 H (400 MHz, CDCl3) NMR spectrum of 2 at 298 K. S9

10 Figure S9. 13 C (100 MHz, CDCl3) NMR spectrum of 2 at 298 K. S10

11 Figure S10. 1 H (500 MHz, CD2Cl2) NMR spectrum of 3 at 298 K. S11

12 Figure S C (125 MHz, CD2Cl2) NMR spectrum of 3 at 298 K. S12

13 Figure S12. 1 H (500 MHz, CDCl3) NMR spectrum of 4 at 298 K. S13

14 Figure S C (125 MHz, CDCl3) NMR spectrum of 4 at 298 K. S14

15 Figure S14. 1 H (400 MHz, CDCl3) NMR spectrum of 7 at 298 K. S15

16 Figure S C (100 MHz, CDCl3) NMR spectrum of 7 at 298 K. S16

17 Figure S16. 1 H (400 MHz, CDCl3) NMR spectrum of 8 at 298 K. S17

18 Figure S C (100 MHz, CDCl3) NMR spectrum of 8 at 298 K. S18

19 Figure S18. 1 H (500 MHz, d6-dmso) NMR spectrum of 9 at 298 K. S19

20 Figure S C (125 MHz, d6-dmso) NMR spectrum of 9 at 298 K. S20

21 Figure S20. 1 H (400 MHz, d6-dmso) NMR spectrum of 10 at 298 K. S21

22 Figure S C (100 MHz, d6-dmso) NMR spectrum of 10 at 298 K. S22

23 Figure S22. 1 H (500 MHz, d6-dmso) NMR spectrum of 11 at 298 K. S23

24 Figure S C (125 MHz, d6-dmso) NMR spectrum of 11 at 298 K. S24

25 Figure S24. 1 H (500 MHz, CDCl3) NMR spectrum of 12 at 298 K. S25

26 Figure S C (125 MHz, CDCl3) NMR spectrum of 12 at 298 K. S26

27 Figure S26. 1 H (400 MHz, CDCl3) NMR spectrum of 14 at 298 K. S27

28 Figure S C (100 MHz, CDCl3) NMR spectrum of 14 at 298 K. S28

29 Figure S28. 1 H (400 MHz, CDCl3) NMR spectrum of 15 at 298 K. S29

30 Figure S C (100 MHz, CDCl3) NMR spectrum of 15 at 298 K. S30

31 Figure S30. 1 H (400 MHz, CDCl3) NMR spectrum of 16 at 298 K. S31

32 Figure S C (100 MHz, CDCl3) NMR spectrum of 16 at 298 K. S32

33 Figure S32. 1 H (500 MHz, CDCl3) NMR spectrum of 17 at 298 K. S33

34 Figure S C (125 MHz, CDCl3) NMR spectrum of 17 at 298 K. S34

35 Figure S34. 1 H (500 MHz, CDCl3) NMR spectrum of 18 at 298 K. S35

36 Figure S C (125 MHz, CDCl3) NMR spectrum of 18 at 298 K. S36

37 Figure S36. 1 H (400 MHz, CDCl3) NMR spectrum of 19 at 298 K. S37

38 Figure S C (100 MHz, CDCl3) NMR spectrum of 19 at 298 K. S38

39 Figure S38. 1 H (500 MHz, CDCl3) NMR spectrum of 20 at 298 K. S39

40 Figure S C (125 MHz, CDCl3) NMR spectrum of 20 at 298 K. S40

41 Figure S40. 1 H (500 MHz, CDCl3) NMR spectrum of 21 at 298 K. S41

42 Figure S C (125 MHz, CDCl3) NMR spectrum of 21 at 298 K. S42

43 Table S1: DFT (M06-2X/6-31+G(d))-Derived Cartesian Coordinates of Ground-State Structures 1Z C C C C C C N C C C N C C N C O C C H H H H H H H H H H H H H H H H H S43

44 1E C C C C C C N C C C N C C N C O C C H H H H H H H H H H H H H H H H H S44

45 2Z C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S45

46 2E C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S46

47 3Z C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S47

48 3E C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S48

49 4Z C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S49

50 4E C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S50

51 Table S2: TDDFT (M06-2X/6-31+G(d))-Derived Cartesian Coordinates of Excited-State Structures 1Z* C C C C C C N C C C N C C N C O C C H H H H H H H H H H H H H H H H H S51

52 1p* C C C C C C N C C C N C C N C O C C H H H H H H H H H H H H H H H H H S52

53 1E* C C C C C C N C C C N C C N C O C C H H H H H H H H H H H H H H H H H S53

54 2Z* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S54

55 2p* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S55

56 2E* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S56

57 3Z* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S57

58 3p* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S58

59 3E* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S59

60 4Z* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S60

61 4p* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S61

62 4E* C C C C C C N C C C N C C N C O C C H C H H H H H H H H H H H H H H H N S62

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