Detail publikace

Complete Set of Diketopyrrolopyrrole Centrosymmetrical Cofacial Stacked Pairs

LUŇÁK, S. WEITER, M. VALA, M.

Originální název

Complete Set of Diketopyrrolopyrrole Centrosymmetrical Cofacial Stacked Pairs

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Stacked centrosymmetrical dimers and simultaneously H-bonded and stacked hexamers of thiophene-substituted diketopyrrolopyrrole (ThDPP) were studied using DFT as models for crystals with slipped-stacked molecules in 1D columns. Eight stacked dimer arrangements were found, six of which are driven by the minimisation of electron repulsion and realised by placing the partially negatively charged atoms of the diketopyrrolopyrrole rings below the centre of an adjacent thiophene ring. Four of these stacks are related to N,N'-dialkylated derivatives of ThDPP found in the literature, while a further one is related to an N,N'-diacylated derivative. An analogous set of eight stacks was discovered computationally for phenyl-substituted DPP (PhDPP), four of which are known among H-bonded DPP pigments, and one more among N,N'-dialkylated PhDPP derivatives. The results shed more light on the mechanisms that drive the formation of stacks between nonaromatic (DPP) and aromatic (Th, Ph) rings. The excitation energies of the lowest four singlet states computed by TD DFT enabled excitonic coupling and energy separation between Frenkel-resonance-type and charge-transfer states to be established, depending on the equilibrium stack geometry.

Klíčová slova

diketopyrrolopyrrole; stacked centrosymmetrical dimers; excitonic coupling; density functional calculations; crystal engineering

Autoři

LUŇÁK, S.; WEITER, M.; VALA, M.

Vydáno

30. 6. 2022

Nakladatel

WILEY-V C H VERLAG GMBH

Místo

WEINHEIM

ISSN

1439-4235

Periodikum

CHEMPHYSCHEM

Ročník

23

Číslo

21

Stát

Spolková republika Německo

Strany počet

9

URL

BibTex

@article{BUT181373,
  author="Stanislav {Luňák} and Martin {Weiter} and Martin {Vala}",
  title="Complete Set of Diketopyrrolopyrrole Centrosymmetrical Cofacial Stacked Pairs",
  journal="CHEMPHYSCHEM",
  year="2022",
  volume="23",
  number="21",
  pages="9",
  doi="10.1002/cphc.202200252",
  issn="1439-4235",
  url="https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/cphc.202200252"
}