Table 1 Summary of photoisomerization rate constants for spiropyran, hydrazone, and diarylethene derivatives in solution and coordinatively-integrated in frameworks

From: Breaking the photoswitch speed limit

Sample

Conditions

k, s−1

Sample

Conditions

k, s−1

1a

EtOH

0.033(5)

6b

DMF

0.015(5)

1a

toluene

0.060(7)

UiO-67 + 6

DMF

0.029(3)

1a

THF

0.074(4)

UiO-67 + 6

solvent-free

0.026(2)

1a

DMF

0.14(2)

7b

MeOH

0.00060(7)

2a

DMF

0.036(2)

8b

MeOH

0.00060(8)

2a

THF

0.048(4)

9b

toluene

0.03(1)

UiO-67 + 2

DMF

0.061(4)

10

solid state

0.13(3)

UiO-67 + 2

solvent-free

31.2(5)

11

solid state

0.0337(5)

3a

EtOH

0.037(3)

11c

DMF

0.19(1)

3a

toluene

0.07(2)

UiO-67 + 11

DMF

0.32(2)

3a

DMF

0.08(1)

UiO-67 + 11

solvent-free

0.177(3)

3a

CH3CN

0.054(4)

12

solid state

0.36(6)

Zn2(3)(DBTD)

DMF

0.054(7)

12c

DMF

0.037(3)

Zn2(3)(DBTD)

solvent-free

53(2)

12c

EtOH

0.005(1)

4b

toluene

0.0086(3)

12c

toluene

0.009(1)

4b

DMF

0.0074(3)

Zn2(12)(DBTD)

DMF

0.0033(3)

5b

DMF

0.00484(1)

13c

CH3CN

0.010(6)

5b

EtOH

0.016(3)

UiO-67 + 2 + 5

DMF

0.084(3)d0.0004(1)e

UiO-67 + 5

DMF

0.005(2)

UiO-67 + 2 + 5

solvent-free

55(2)d 0.00097(3)e

UiO-67 + 5

solvent-free

0.013(4)

   
  1. aconcentration for spiropyran derivatives in solutions was 3 mM;
  2. bconcentration for hydrazone derivatives 4, 5, and 6 in solutions was 30 μM and 7, 8, and 9 in solutions was 10 μM;
  3. cconcentration for diarylethene derivatives in solutions was 3 mM;
  4. dphotoisomerization rate constant corresponding to 2;
  5. ephotoisomerization rate constant corresponding to 5. For all samples, concentrations were selected based on the compound solubility and instrument set up. Standard deviations are provided in parentheses.