Large area, soft crystalline thin films of N,NI,NII-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice

Thomas Just Sørensen; Christoffer B.  Hildebrandt; Jonas Elm; Jens Wenzel Andreasen; Anders Østergaard Madsen; Axel Rune Fredrik Westerlund; Bo Wegge Laursen

doi:10.1039/c2jm15954f

Large area, soft crystalline thin films of N,N^I,N^II-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice

Thomas Just Sørensen, Christoffer B. Hildebrandt, Jonas Elm, Jens Wenzel Andreasen, Anders Østergaard Madsen, Axel Rune Fredrik Westerlund, Bo Wegge Laursen

Department of Chemistry

21 Citations (Scopus)

Abstract

N,N′,N′′-Trialkyltriazatriangulenium (R-TATA ⁺) tetrafluoroborate (BF ₄ ^-) salts form highly ordered thin films directly when spin-cast onto rotating substrates. The homogeneous and crystalline thin films show macroscopic order over centimetres. The crystal structures of the R-TATA·BF ₄ salts are investigated and compared for the propyl, 3-methylpentyl and octyl derivatives. In all cases the molecules pack in hexagonally ordered bilayers, with segregation of the ionic groups and the alkyl chains. This is a rare packing motif with the rigid discotic TATA ⁺ cores organized co-planarly in sheets separated by perpendicularly oriented alkyl chains, somewhat similar to a crystallized lamellar phase of phospholipid bilayers and the lamellar smectic mesophase of liquid crystals. The structure of the thin films is investigated by optical spectroscopy, X-ray reflectometry and grazing incidence X-ray diffraction. All techniques confirm that the 15-30 nm thick films maintain the lamellar structure of the bulk crystals, are flat on macroscopic length scales, and are completely ordered relative to the substrate. The triazatriangulenium molecules are electroactive dyes, and in the highly anisotropic polycrystalline thin film structure they show intense fluorescence and efficient exciton transport.

Original language	English
Journal	Journal of Materials Chemistry
Volume	22
Issue number	11
Pages (from-to)	4797-4805
Number of pages	9
ISSN	0959-9428
DOIs	https://doi.org/10.1039/c2jm15954f
Publication status	Published - 21 Mar 2012

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Large area, soft crystalline thin films of N , N 0 , N 00 -trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar latticeFinal published version, 1.17 MB

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Sørensen, T. J., Hildebrandt, C. B., Elm, J., Andreasen, J. W., Madsen, A. Ø., Westerlund, A. R. F., & Laursen, B. W. (2012). Large area, soft crystalline thin films of N,N^I,N^II-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice. Journal of Materials Chemistry, 22(11), 4797-4805. https://doi.org/10.1039/c2jm15954f

Large area, soft crystalline thin films of N,N^I,N^II-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice. / Sørensen, Thomas Just; Hildebrandt, Christoffer B. ; Elm, Jonas et al.

In: Journal of Materials Chemistry, Vol. 22, No. 11, 21.03.2012, p. 4797-4805.

Research output: Contribution to journal › Journal article › Research › peer-review

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title = "Large area, soft crystalline thin films of N,NI,NII-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice",

abstract = "N,N′,N′′-Trialkyltriazatriangulenium (R-TATA +) tetrafluoroborate (BF 4 -) salts form highly ordered thin films directly when spin-cast onto rotating substrates. The homogeneous and crystalline thin films show macroscopic order over centimetres. The crystal structures of the R-TATA·BF 4 salts are investigated and compared for the propyl, 3-methylpentyl and octyl derivatives. In all cases the molecules pack in hexagonally ordered bilayers, with segregation of the ionic groups and the alkyl chains. This is a rare packing motif with the rigid discotic TATA + cores organized co-planarly in sheets separated by perpendicularly oriented alkyl chains, somewhat similar to a crystallized lamellar phase of phospholipid bilayers and the lamellar smectic mesophase of liquid crystals. The structure of the thin films is investigated by optical spectroscopy, X-ray reflectometry and grazing incidence X-ray diffraction. All techniques confirm that the 15-30 nm thick films maintain the lamellar structure of the bulk crystals, are flat on macroscopic length scales, and are completely ordered relative to the substrate. The triazatriangulenium molecules are electroactive dyes, and in the highly anisotropic polycrystalline thin film structure they show intense fluorescence and efficient exciton transport.",

author = "S{\o}rensen, {Thomas Just} and Hildebrandt, {Christoffer B.} and Jonas Elm and Andreasen, {Jens Wenzel} and Madsen, {Anders {\O}stergaard} and Westerlund, {Axel Rune Fredrik} and Laursen, {Bo Wegge}",

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T1 - Large area, soft crystalline thin films of N,NI,NII-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice

AU - Sørensen, Thomas Just

AU - Hildebrandt, Christoffer B.

AU - Elm, Jonas

AU - Andreasen, Jens Wenzel

AU - Madsen, Anders Østergaard

AU - Westerlund, Axel Rune Fredrik

AU - Laursen, Bo Wegge

PY - 2012/3/21

Y1 - 2012/3/21

N2 - N,N′,N′′-Trialkyltriazatriangulenium (R-TATA +) tetrafluoroborate (BF 4 -) salts form highly ordered thin films directly when spin-cast onto rotating substrates. The homogeneous and crystalline thin films show macroscopic order over centimetres. The crystal structures of the R-TATA·BF 4 salts are investigated and compared for the propyl, 3-methylpentyl and octyl derivatives. In all cases the molecules pack in hexagonally ordered bilayers, with segregation of the ionic groups and the alkyl chains. This is a rare packing motif with the rigid discotic TATA + cores organized co-planarly in sheets separated by perpendicularly oriented alkyl chains, somewhat similar to a crystallized lamellar phase of phospholipid bilayers and the lamellar smectic mesophase of liquid crystals. The structure of the thin films is investigated by optical spectroscopy, X-ray reflectometry and grazing incidence X-ray diffraction. All techniques confirm that the 15-30 nm thick films maintain the lamellar structure of the bulk crystals, are flat on macroscopic length scales, and are completely ordered relative to the substrate. The triazatriangulenium molecules are electroactive dyes, and in the highly anisotropic polycrystalline thin film structure they show intense fluorescence and efficient exciton transport.

AB - N,N′,N′′-Trialkyltriazatriangulenium (R-TATA +) tetrafluoroborate (BF 4 -) salts form highly ordered thin films directly when spin-cast onto rotating substrates. The homogeneous and crystalline thin films show macroscopic order over centimetres. The crystal structures of the R-TATA·BF 4 salts are investigated and compared for the propyl, 3-methylpentyl and octyl derivatives. In all cases the molecules pack in hexagonally ordered bilayers, with segregation of the ionic groups and the alkyl chains. This is a rare packing motif with the rigid discotic TATA + cores organized co-planarly in sheets separated by perpendicularly oriented alkyl chains, somewhat similar to a crystallized lamellar phase of phospholipid bilayers and the lamellar smectic mesophase of liquid crystals. The structure of the thin films is investigated by optical spectroscopy, X-ray reflectometry and grazing incidence X-ray diffraction. All techniques confirm that the 15-30 nm thick films maintain the lamellar structure of the bulk crystals, are flat on macroscopic length scales, and are completely ordered relative to the substrate. The triazatriangulenium molecules are electroactive dyes, and in the highly anisotropic polycrystalline thin film structure they show intense fluorescence and efficient exciton transport.

U2 - 10.1039/c2jm15954f

DO - 10.1039/c2jm15954f

M3 - Journal article

SN - 0959-9428

VL - 22

SP - 4797

EP - 4805

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

IS - 11

ER -

Large area, soft crystalline thin films of N,NI,NII-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice

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Large area, soft crystalline thin films of N,N^I,N^II-trialkyltriazatriangulenium salts with homeotropic alignment of the discotic cores in a lamellar lattice