Table 1 Summarized optical properties of DNF–V derivatives and DNT–V for comparison

From: Alkylated oxygen-bridged V-shaped molecules: impacts of the substitution position and length of the alkyl chains on the crystal structures and fundamental properties in aggregated forms

Compounds

λ max abs (nm) in solution a

λ max abs (nm) in thin film b

λ max em (nm) in solution c

Φ f (%) in solution d

λ max em (nm) in solution e

Φ f (%) in solid f

DNF–V

322, 337, 362, 382

298, 354, 374, 396

389, 410, 431 (sh)

83

408 (sh), 427, 455, 488, 524

72

DNT–V

327, 343, 383, 404

275, 313, 400, 425

422, 441

8

462

3

C 6 –DNF–VV

322, 340, 369, 389

294, 346, 379, 401

398, 419, 444 (sh)

83

411, 432, 453, 489 (sh)

17

C 10 –DNF–VV

323, 340, 369, 389

296, 363, 381, 404

398, 419, 444 (sh)

87

411, 435, 456 (sh)

18

C 6 –DNF–VW

331, 347, 359 (sh), 380

304, 353, 372, 394

389, 409, 431 (sh)

89

404 (sh), 422, 445

51

C 10 –DNF–VW

331, 348, 359 (sh), 381

306, 353, 374, 397

388, 409, 431 (sh)

83

407 (sh), 424, 448

40

  1. aAbsorption spectra measured in 1,2-dichloroethane at room temperature. sh: shoulder.
  2. bAbsorption spectra measured in vacuum deposited thin film on quarts substrate at room temperature.
  3. cEmission spectra excited at 340 nm measured in 1,2-dichloroethane at room temperature. sh: shoulder.
  4. dFluorescence quantum yield in solution.
  5. eEmission spectra excited at 340 nm measured in solid state. sh: shoulder.
  6. fFluorescence quantum yield in solid.
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