Table 3 Rate constants of radiative (kr) and non-radiative (knr) intramolecular processes for NTBD in various solvents and mixed DMSO: H2O systems.

From: Spectroscopic characterization and assessment of microbiological potential of 1,3,4-thiadiazole derivative showing ESIPT dual fluorescence enhanced by aggregation effects

DMSO: H2O

τ1

\({\Phi }_{F}\)

kr [ns-1]

kr [s-1]

knr [ns-1]

knr [s-1]

99:1

1.203

0.3735

0.31

3.10‧10–10

0.52

5.21‧10–10

9:1

0.873

0.2594

0.30

2.97‧10–10

0.85

8.48‧10–10

7:3

0.435

0.179

0.41

4.11‧10–10

1.89

1.89‧10–9

5:5

0.355

0.1936

0.55

5.45‧10–10

2.27

2.27‧10–9

3:7

0.213

0.1308

0.61

6.14‧10–10

4.08

4.08‧10–9

1:9

0.129

0.0573

0.44

4.44‧10–10

7.31

7.31‧10–9

1:99

0.158

0.0265

0.17

1.68‧10–10

6.16

6.16‧10–9

Solvent

τ1

\({\Phi }_{F}\)

kr [ns-1]

kr [s-1]

knr [ns-1]

knr [s-1]

Methanol

1.72

0.82

0.48

4.78‧10–10

0.10

1.03‧10–10

Ethanol

1.76

0.73

0.42

4.16‧10–10

0.15

1.53‧10–10

DMF

1.53

0.48

0.31

3.12‧10–10

0.34

3.42‧10–10

THF

1.61

0.13

0.08

7.99‧10–11

0.54

5.41‧10–10

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