Charge-Transfer Controlled Crystallization of a Model Oligomer for Donor-Acceptor-Polythiophenes

Materials

Ralph Rieger¹  Volker Enkelmann¹ 

[1] Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;

关键词: conjugated oligomer;    donor-acceptor;    charge-transfer;    crystal engineering;    molecular packing;    energy levels;   

DOI  :  10.3390/ma3031904

来源: mdpi

【 摘 要 】

A model donor-acceptor oligomer consisting of benzodithiophene-diketone and thiophene has been investigated with regard to its molecular packing and opto-electronic properties. The crystal structure suggests that the packing is dominated by charge-transfer interactions between the electron-rich part of the molecule and the electron-poor part. A series of observations corroborate this assumption, among them are a charge-transfer band in the film absorption spectra and exceptionally low π-π distances. A detailed analysis of the energetic levels of the present system reveals that only the HOMO level of the acceptor is shifted by conjugation to the donor. The results can contribute to the development of improved materials for organic electronics.

【 授权许可】

CC BY   
© 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.