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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

From: New potential antitumoral fluorescent tetracyclic thieno[3,2-b]pyridine derivatives: interaction with DNA and nanosized liposomes

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