Table 1 Optical properties of the compounds 1a, 1b and 3.

From: Tuning of the Electro-Optical Properties of Tetraphenylcyclopentadienone via Substitution of Oxygen with Sterically-Hindered Electron Withdrawing Groups

Solvent (dipolar moment)

1a

1b

3

λabs[a] nm λ1, λ2, λ3

λem[b] nm (Φ[[c])

λabs[a] λ1, λ2, λ3

λem[b] nm (Φ[c])

λabs[a] λ1, λ2, λ3

λem[b] nm (Φ[c])

Toluene (μ = 0.4 D

Δf = 0.015)

330 (13)

460

(0.8)

435 (0.13)

380 (15)

500

(0.4)

435 (0.34)

500

(0.4)

330 (7.5) 510 (1.5)

435 (0.0031)

CH2Cl2

(μ = 1.8 D

Δf = 0,218)

250

(19)

320

(8.0)

460 (0.03)

435

(0.13)

270

(17)

380

(13)

545

(0.03)

435

(0.045)

260

(26)

330

(6.3)

510

(1.1)

435

(0.015)

DMF (μ = 3.8 D

Δf = 0,274)

320

(13)

460 (0.02)

—

375 (15)

500 (0.02)

—

330 (7.5)

510 (1.3)

—

CH3CN (μ = 3.2 D Δf = 0,305)

250 (27)

320 (12)

460 (0.5)

430

(0.0095)

260 (20)

370 (14)

500 (0.3)

430 (0.061)

260 (23)

330 (5.2)

500 (0.5)

435 (0.001)

MeOH

(μ = 1.7 D Δf = 0,309)

322

(16)

464

(0.05)

430

(0.01)

374

(19)

500

(0.05)

435

(0.02)

332

(7.3)

502

(1.7)

435

(0.001)

  1. [a]Average values of absorption wavelengths (nm) at different concentrations. The intensities are reported in brackets, the units are M−1cm−1 × 103. In Toluene and DMF, the λ1 is not visible for the cut off of the solvents. [b]Emission generated from excitation at the λ2 of absorption and concentrations ~2–5 × 10−6 M. [c]Quantum yield measured at concentrations ~5 × 10−6 M, as reference Phenothiazine was used which value of Φ is 0.0156.
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