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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
https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/cphc.202200252
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" }