Universität zu Köln

Balzer, Frank ORCID: 0000-0002-6228-6839, Schumacher, Marvin F., Mattiello, Sara, Schulz, Matthias, Zablocki, Jennifer ORCID: 0000-0002-2100-4807, Schmidtmann, Marc, Meerholz, Klaus ORCID: 0000-0001-7450-4672, Serdar Sariciftci, N., Beverina, Luca, Luetzen, Arne and Schiek, Manuela . The Impact of Chiral Citronellyl-Functionalization on Indolenine and Anilino Squaraine Thin Films. Isr. J. Chem.. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1869-5868

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Abstract

The impact on chiral aggregation in solution processed and thermally annealed thin films of two indolenine and one anilino squaraines with chiral (S)-citronellyl functionalization at the nitrogen of the squaraine backbone is investigated. A pseudo polymorphic crystal structure is obtained for one of the indolenine squaraines, but thin films of both compounds are basically non-aggregated and truly isotropic as evidenced by spectroscopic ellipsometry. The anilino squaraine coalesces and readily aggregates to circular dichroic but discontinuous thin films. The extent of circular dichroism correlates with the morphology of the samples, which is quantified by Mueller matrix polarimetry in combination with atomic force microscopy. The shape of the CD spectra reinforces the hybrid Frenkel and charge-transfer excitonic nature of the characteristic double hump signatures within unpolarized absorbance spectra of previously investigated non-chiral anilino squaraines with linear alkyl chain functionalization. Such excitonic CD offers an additional design parameter for next-generation opto-electronic devices.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Balzer, Frank UNSPECIFIED orcid.org/0000-0002-6228-6839 UNSPECIFIED Schumacher, Marvin F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mattiello, Sara UNSPECIFIED UNSPECIFIED UNSPECIFIED Schulz, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Zablocki, Jennifer UNSPECIFIED orcid.org/0000-0002-2100-4807 UNSPECIFIED Schmidtmann, Marc UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Serdar Sariciftci, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beverina, Luca UNSPECIFIED UNSPECIFIED UNSPECIFIED Luetzen, Arne UNSPECIFIED UNSPECIFIED UNSPECIFIED Schiek, Manuela UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-594029
DOI:	10.1002/ijch.202100079
Journal or Publication Title:	Isr. J. Chem.
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1869-5868
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CHIROPTICAL PROPERTIES; MUELLER MATRIX; CIRCULAR-DICHROISM; DYES; ORIGIN Multiple languages Chemistry, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59402