incorporated the electron acceptor benzothiadiazole (BT) into the ring to construct donor-acceptor macrocycles BT[10]CPP. The DFT calculations revealed that the LUMO of BT [10]CPP is localized on the acceptor moiety and the LUMO level is stabilized by 0.8 eV compared to the reference [10]CPP, while the HOMOs are located on the remaining benzene rings on the macrocycle and are slightly destabilized compared to that of [10]CPP. The donor-acceptor (D-A) character of BT [10]CPP is evident in the absorption spectrum where a new band was observed at 450 nm, which correlates to the HOMO→LUMO transition that is of charge transfer (CT) character as assigned by time-dependent DFT (TD-DFT) calculations. The emission spectrum of BT [10]CPP is red-shifted by more than 100 nm (3946 cm -1 ) with a maximum emission wavelength (λPL) of 571 nm and a ΦPL of 59% in dichloromethane (DCM), compared to λPL of 466 nm and ΦPL of 65% for [10]CPP; moreover, the emission spectrum red-shifts with increasing solvent polarity, which is consistent with emission from a state of CT character. Tan et al. reported the incorporation of four BT moieties within [12]CPP and the molecule TB [12]CPP shows a similar absorption spectrum and similar positive emission solvatochromism behavior to those of BT[10]CPP. The λPL of TB [12]CPP is 569 nm and the ΦPL is 81% in chloroform, while in the 10 wt% doped PMMA film, the ΦPL increases to 98% at λPL of 550 nm. The potential of CPP and its derivatives as electronic/charge transport materials in organic field-effect transistor (OFET) also have been reported. Yamago et al. connected electron-donating alkoxy groups on [10]CPP, in chloroform the molecule TA[10]CPP emits at 477 nm with ΦPL of 59% compared to 470 nm and 46% for the reference [10]CPP (Figure ). The electron-only device based on 6C showed a space charge limited current (SCLC), with moderate electron mobility of 4.5 × 10 -6 cm 2 V -1 s -1 at 0.7 MV cm -1 , which demonstrates the potential of this compound as an electron transport material. Computational studies from Sancho-García et al.