Spiro‐Bridged Ladder‐Type Oligo(para‐phenylene)s: Fine Tuning Solid State Structure and Optical Properties |
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| Authors: | Björn Kobin Jutta Schwarz Beatrice Braun‐Cula Moritz Eyer Anton Zykov Stefan Kowarik Sylke Blumstengel Stefan Hecht |
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| Affiliation: | 1. Department of Chemistry & IRIS Adlershof, Humboldt‐Universit?t zu Berlin, Berlin, Germany;2. Institut für Physik, Humboldt‐Universit?t zu Berlin, Berlin, Germany |
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| Abstract: | 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. |
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| Keywords: | chromophores hybrid materials ladder oligomers/polymers resonant energy transfer small molecule emitters |
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