Review Article

Transient Exciplex Formation Electron Transfer Mechanism

Table 1

Parameters of exciplex formation and decay, obtained from the dependences of 𝑘 𝑄 on Δ 𝐺 𝐸 𝑇 (16) in various systems.

FigureSystem l o g 𝜏 0 + 𝑎 / 2 . 3 𝑅 𝑇 a/eVa ( l o g 𝜏 0 )b/eVc/eV 𝜆 b / e V Reference

7Various aromatics (in MeCN) (charge separation)−2.80.3 (−8)0.060.30.35 0.11c[31]

81 ( M e C = O ) 2 and 3 ( M e C = O ) 2 + alkenes (in MeCN) (charge separation)−4.70.24 (−9)0.350.280.9[33]

9Oxonine+ + substituted benzenes (in MeOH) (charge shift)−7.80.24 (−12)−0.050.280.3[43]

101Aromatics* + chlorobenzenes (in MeCN) (charge separation)−4.90.25 (−9)0.320.3 (0.2–0.37)0.7[12]

113Quinones + methylbenzenes
(in MeCN and CH2Cl2)
(charge separation)
−4.50.25 (−9)−0.220.20.1[14]

121Cyanoaromatics* + methoxy- benzenes and methylnaphthalenes in MeCN (charge separation)−4.70.25 (−8)−0.230.20.25[15]

1313-Carboxyethyl-7-methyl-thioxanthen-9-one* + Methyl- benzenes in MeCN −7.3
0.18 (−11)
0.13 0.1
0.1
[39]
+ Methoxybenzenes in MeCN (charge separation) −5.9 0.35 (−11)0.13 0.1 0.5

141Cyanoaromatics* + pyridine in MeCN−3.50.34 (−10.5)−0.050.5<0 [48]
+ Lutidine in MeCN (charge separation)−1.20.34 (−8)−0.050.50.1

aValues of 𝑎 are obtained for the estimated values of l o g 𝜏 0 .
bValues of 𝜆 for (3) are estimated for Δ 𝐺 E T > 0 . 3  eV (they are not valid at Δ 𝐺 E T < 0 . 3  eV). cEstimated values of Δ 𝐺 0 for (6).