Research Article

Quantum Chemical and Spectroscopic Investigations of (Ethyl 4 hydroxy-3-((E)-(pyren-1-ylimino)methyl)benzoate) by DFT Method

Table 4

Calculated electronic absorption spectrum of (ethyl 4 hydroxy-3-((E)-(pyren-1-ylimino) methyl) benzoate) using TD DFT/B3LYP/6-311++G(2d, 2p), with experimentally reported values by other authors in brackets.

Excited state (triplet/singlet) CI expansion coefficientEnergy (eV)Wavelength calc. (nm)Oscillator Strength (f)

1(T)0.642821.8590666.950.0000
103→104−0.20390
103→105−0.11486
103→106
2(T)0.145672.6252472.280.0000
99→104−0.13249
100→104−0.14414
101→104−0.10275
101→105−0.24936
102→1040.17216
103→1040.46822
103→105−0.28107
103→1060.69539
3(S)0.695392.7450451.670.7677
103→104
4(T)0.135793.1085398.860.0000
98→1040.37034
101→1040.24413
101→1050.26932
102→1040.17397
102→1050.13812
103→1040.12732
103→105−0.30215
103→106−0.15823
103→107
5(T)−0.258293.2510381.37 (383)0.0000
101→1040.54783
102→104−0.16061
102→1050.17231
103→1050.18500
103→107
6(T)0.124033.3508370.010.0000
99→104−0.18914
100→1040.23302
101→1040.10005
101→1050.58730
103→107
7(S)0.462633.4071363.900.1405
102→1040.42672
103→105−0.18292
103→106−0.22746
103→107
8(T)0.382743.4113363.450.0000
101→104−0.15712
101→105−0.28172
101→106−0.18264
102→1060.20011
103→1050.29507
103→106−0.12290
103→107
9(T)−0.313833.4452359.880.0000
99→1040.12754
99→105−0.18356
100→1040.15473
100→105−0.10501
100→1060.10458
103→1050.10831
103→1060.48610
103→108
10(T)0.265333.4968354.560.0000
98→104−0.17532
99→1040.14537
99→1060.25397
100→1040.14670
101→106−0.13584
102→1040.14197
102→1050.10470
103→1040.26216
103→1050.28660
103→1060.15214
103→107
11(S)0.289173.5463349.620.0491
101→104−0.13634
102→1040.44769
103→1050.37599
103→1060.20752
103→107
12(S)0.307763.6873336.240.1203
102→1040.10328
102→107−0.23091
103→1050.48945
103→1060.24268
103→107
13(T)0.135263.6887336.120.0000
99→104−0.17258
100→1040.28909
101→1050.14313
101→106−0.13298
101→107−0.14420
102→1050.31031
102→1060.21164
102→1070.19945
103→1050.22837
103→106−0.12402
103→107
14(T)0.441933.7249332.850.0000
98→104−0.13986
99→105−0.25100
101→106−0.21945
102→1050.22073
102→107−0.14380
103→109
15(S)0.549443.7645329.350.0736
101→1040.23402
102→104−0.19623
103→105−0.22900
103→1060.18853
103→107
16(S)−0.282503.9579313.250.1484
101→1040.39900
102→1040.18195
102→1050.46966
103→107
17(S)−0.116714.1055301.990.0048
96→104−0.24326
98→1040.12165
99→1040.57103
100→104−0.11945
103→1070.22342
103→108
18(S)0.118824.1535298.150.0127
98→104−0.21315
100→1040.64522
103→108
19(S)0.153214.2776289.840.0049
96→1040.45970
98→1040.41273
99→1040.19557
100→104
20(S)−0.300754.3829282.88 (238)0.3427
98→1040.41155
99→104−0.21058
100→1040.25420
102→105−0.28124
102→106