Research Article

Molecular Structure and Electronic Properties of Porphyrin-Thiophene-Perylene Using Quantum Chemical Calculation

Table 2

Changes of the torsion angles ( and , defined in Figure 2), and the corresponding energy gap , of the PTP derivatives obtained from the B3LYP/6–31G(d) calculations, relative to those of the PTP compound (R = R′ = –H), after subtraction of the values obtained from the PTP compounds by those of its derivatives.

Substituent R/R′Torsion angle (degree) (eV)

Disubstituted derivative

H, H0.00.00.00.0
CH3, CH3–74110.019
OCH3, OCH3–220220.108
OH, OH5500.209
NH2, NH24–1923–0.089
N(CH3)2, N(CH3)2–189–0.086
CN, CN0000.143
NO2, NO2–76130.164

Monosubstituted derivative

CH3, H/H, CH3–6/43/–79/110.045/–0.051
OCH3, H/H, OCH30/21/51/30.157/0.097
OH, H/H, OH–1/00/01/00.157/0.128
NH2, H/H, NH21/51/–160/21–0.065/0.134
N(CH3)2, H/H, N(CH3)22/36/34/00.118/0.028
CN, H/H, CN–3/0–1/12/10.016/0.143
NO2, H/H, NO2–3/21/44/2–0.022/0.205