Molecular aggregation of naphthalimide organic semiconductors assisted by amphiphilic and lipophilic interactions: a joint theoretical and experimental study

Ladder-type bithiophene imide-based organic semiconductors: understanding charge transport mechanisms in organic field effect transistors

“…In this case the spectrum at low temperature is quite similar to that at room temperature, indicating that aggregates are easily formed in these compounds even at low concentrations and room temperature. 10,38…”

“…Molecular aggregation is key in thin film devices since charge carriers need to be stabilized and transported through the device active channel. 38,39 To better understand how charge is transported in solid state films based on these promising ladder-type BTI2-BTI5 molecules, we first fabricated and characterized top-gate, bottomcontact OFETs (see fabrication of OFETs in the Experimental section). As previously reported, a remarkable decrease in field effect mobility is found as the BTI unit gets longer, with one order of magnitude drop for BTI5 with respect to the shortest members of the series (see data in Table 3).…”

Photocatalytic degradation of organic pollutants through conjugated poly(azomethine) networks based on terthiophene–naphthalimide assemblies

“…Both materials show ambipolar redox behaviour in which the reversible reduction processes are characteristic of the naphthalimide unit, while the oxidation processes can be ascribed to the conjugated oligothiophene moiety. [19][20][21][22]24 For NIP3T-ANW, the rst reversible reduction wave (À1.29 V) is shied to less negative values in comparison with NIP-3T (À1.41 V). On the other hand, the rst oxidation half wave potential for NIP3T is observed at +0.41 V and for NIP3T-ANW at +0.44 V. These shis agree with the electron acceptor ability of the imine linker.…”

“…13 In this respect, molecular and polymeric materials based on the combination of oligothiophene 14,15 and naphthalimide moieties 16,17 connected through conjugated linkers have shown to be very effective in order to efficiently tune their frontier orbital levels and produce tunable organic semiconductors with good charge transport properties. [18][19][20][21][22][23][24] As an example, in Fig. 1 is depicted the structure of NIP-3T, an ambipolar organic semiconductor, for which the one-electron HOMO-LUMO excitation consists of the displacement of the electron density from the HOMO, primarily localized on the oligothiophene fragment, to the LUMO, localized on the naphthalimide unit.…”

“…S6 †). 22,25 In photocatalysis mediated by semiconductors, electronhole pairs (excitons) are generated aer light absorption and aerwards dissociate into free charge carriers that can be utilized for redox reactions 33,34 such as CO 2 xation, 35 water splitting 36 or organic mineralization. 37 Some of the crucial factors that make the photocatalytic process favourable are the levels of conduction and valence as well as the width of the band gap.…”