Impact of systematic structural variation on the energetics of π−π stacking interactions and associated computed charge transfer integrals of crystalline diketopyrrolopyrroles

Jesus Calvo-Castro, Monika Warzecha, Alan Kennedy, Callum McHugh, Andrew J. McLean

Research output: Contribution to journalArticle

18 Citations (Scopus)
80 Downloads (Pure)

Abstract

Control over solid state structure is critical for effective performance in optoelectronic devices bearing π-conjugated charge mediating organic materials. A series of five structurally related N-benzyl-substituted diketopyrrolopyrroles (DPPs) differing solely in 2 out their 60 atoms were synthesized and crystal structures obtained. Systematic variation of the long axis aligned, π−π stacks has been identified within the single crystal structure series and intermolecular interaction energies and charge transfer integrals for the π−π stacks have been computed by means of density functional theory (M06-2X/6-311G(d)). The computed intermolecular interaction energies as well as charge transfer integrals were further investigated utilizing a series of systematically cropped dimer pairs, highlighting the crucial role of the benzyl/halo substitution on stabilization of these π−π dimers. Two of the DPPs, including a new polymorph of a previously reported structure exhibit twice the intermolecular interaction energy and comparable hole transfer integrals to Rubrene, one of the most efficient hole conducting materials known. The computed properties for all of the π−π dimer systems reported herein are consistent with trends predicted by a model system. As such these materials show great promise as charge mediators in organic electronic applications and may be exploited in systematic structure activity based investigations of charge transfer theory.
Original languageEnglish
Pages (from-to)4849-4858
Number of pages10
JournalCrystal Growth and Design
Volume14
Issue number9
Early online date28 Jul 2014
DOIs
Publication statusPublished - 2014

Keywords

  • solid state
  • structural variation
  • crystalline diketopyrrolopyrroles
  • charge transport activity
  • crystal structure
  • Rubrene

Fingerprint Dive into the research topics of 'Impact of systematic structural variation on the energetics of π−π stacking interactions and associated computed charge transfer integrals of crystalline diketopyrrolopyrroles'. Together they form a unique fingerprint.

  • Cite this