Table 1

Maximum absorption (λabs) and emission (λem) wavelengths, molar absorption coefficients (ε) and fluorescence quantum yields of compounds 1 and 2 in several solvents

Solvent

λabs (nm) (ε/104 M-1 cm-1)

λem (nm)

ΦF

1

2

1

2

1

2


Cyclohexane

398 (0.84); 377 (1.24); 360 (1.27); 305 (0.95); 258 (3.93)

411 sh (0.33); 354 (2.19); 347 (2.37); 308 (1.25); 291 (1.12); 270 (1.40)

402; 426; 452 sh

417; 441

0.20

0.047

Dioxane

398 (0.76); 377 (1.18); 359 (1.20); 305 (1.17); 258 (3.60)

411 sh (0.66); 356 (5.36); 346 (5.40); 309 (3.23); 291 (2.98); 272 (3.33)

407; 428; 455 sh

425; 449

0.29

0.054

Dichloromethane

397 (0.58); 377 (0.91); 360 (0.93); 305 (0.97); 259 (2.70)

410 sh (0.55); 357 (4.37); 311 (2.28); 290 (2.29); 273 (2.78)

408; 429

427; 448

0.26

0.022

Acetonitrile

395 (0.68); 376 (1.06); 358 (1.06); 304 (1.09); 256 (3.32)

409 sh (0.66); 355 (5.76); 308 (3.41); 289 (3.20); 271 (3.67)

408; 428

450

0.21

0.036

N,N-Dimethylformamidea

397 (0.78); 377 (1.19); 360 (1.16); 305 (1.19)

411 sh (0.69); 356 (5.52); 311 (3.11); 290 (2.86)

411; 430

453

0.30

0.047

Dimethylsulfoxidea

397 (0.77); 378 (1.17); 361 (1.14); 305 (1.17)

412 sh (0.61); 357 (4.70); 313 (2.52)

413; 432

455

0.28

0.048

Ethanol

396 (0.69); 375 (1.13); 358 (1.17); 304 (1.40); 256 (3.59)

408 sh (0.72); 355 (5.50); 311 (2.95); 272 (3.69)

412; 431

452

0.27

0.041

Methanol

395 (0.67); 374 (1.08); 358 (1.10); 304 (1.34); 256 (3.43)

408 sh (0.62); 354 (5.00); 311 (2.80); 272 (3.41)

413; 433

453

0.26

0.040

Water

394 (0.41); 374 (0.57); 361 (0.58); 303 (0.93); 256 (2.07)

420 sh (0.26); 358 (0.87); 314 (0.94); 278 (0.97)

413 sh; 433

505

0.22

0.012


aSolvent cut-offs: N,N-Dimethylformamide: 275 nm; Dimethylsulfoxide: 280 nm; sh: shoulder.

Castanheira et al. Nanoscale Research Letters 2011 6:379   doi:10.1186/1556-276X-6-379

Open Data