3 years ago

Spiro-Bridged Ladder-Type Oligo(para-phenylene)s: Fine Tuning Solid State Structure and Optical Properties

Spiro-Bridged Ladder-Type Oligo(para-phenylene)s: Fine Tuning Solid State Structure and Optical Properties
Jutta Schwarz, Sylke Blumstengel, Björn Kobin, Anton Zykov, Stefan Kowarik, Moritz Eyer, Stefan Hecht, Beatrice Braun-Cula
A set of ladder-type quaterphenyls with an incremental number of spiro-bifluorene units in the bridge positions as well as an in-plane bent quaterphenyl carrying all bridges on one and the same side of the ribbon are synthesized and characterized. While spiro-bifluorene substituents lead to bathochromically shifted maxima in the UV–vis absorption spectra, this effect can be compensated by in-plane bending. The influence of different deposition techniques on the solid state structure is analyzed by X-ray diffraction of single crystals obtained by crystallization from solution as well as sublimation. An increasing number of spiro-bifluorene substituents are found to aid thin-film formation. A set of ladder-type quaterphenyls with an incremental number of spiro-bifluorene units and an in-plane bent quaterphenyl carrying all bridges on one side of the ribbon are synthesized and characterized with regard to their optical properties and their ability of thin-film formation. The influence of different crystallization techniques on the solid state structure is analyzed by single crystal X-ray diffraction.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201704077

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