Crystal structures and dielectric properties of 4,4 '-dimethyl-6,6 '-dichlorothioinaigo (Pigment Red 181)

The structures of the red polymorph (space group P (1) over bar) and the black polymorph (space group P2(1)/c) of 4,4'-dimethyl-6,6'-dichlorothioindigo were solved from single-crystal samples. For both polymorphs, the spatial stacking of the flat molecules is driven by pi-stacking and noncovalent interactions within the layers. Spectroscopic (UV-vis, IR and photoluminescence) and thermal properties of the red polymorph were investigated experimentally. The bandgap of this polymorph was estimated as 2.08 eV at room temperature. It is demonstrated that the electric conductivity of the red polymorph follows the hopping mechanism.

Authors
Sakthidharan C.P.1 , Niewa R.2 , Zherebtsov D.A.1 , Podgornov F.V.1 , Matveychuk Y.V.1 , Bartashevich E.V.1 , Nayfert S.A.1 , Adonin S.A.1, 3, 4 , Gavrilyak M.V.1 , Boronin V.A.1, 5 , Polozov M.A.1 , Karthikeyan S. 6 , Sarojadevi M.7 , Rajakumar K.1 , Prabunathan P.8
Language
English
Pages
23-30
Status
Published
Volume
77
Year
2021
Organizations
  • 1 South Ural State Univ, Chelyabinsk, Russia
  • 2 Univ Stuttgart, Inst Inorgan Chem, Stuttgart, Germany
  • 3 Nikolaev Inst Inorgan Chem SB RAS, Novosibirsk, Russia
  • 4 Novosibirsk State Univ, Novosibirsk, Russia
  • 5 Russian Acad Sci, Inst Electrophys, Ural Branch, Ekaterinburg, Russia
  • 6 Peoples Friendship Univ Russia, Moscow, Russia
  • 7 Anna Univ, Chennai, Tamil Nadu, India
  • 8 PSG Inst Technol & Appl Res, Coimbatore, Tamil Nadu, India
Keywords
crystal growth; crystal structure; electric conductivity; DFT studies; Pigment Red 181
Date of creation
20.04.2021
Date of change
20.04.2021
Short link
https://repository.rudn.ru/en/records/article/record/73308/
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