Halogen bonding in diaza-triisopropylsilyl-tetracene crystals?

Four halogenated triisopropylsilylethynyl (TIPS)-tetracene derivatives were synthesized, their single crystal structures and optical and electronic properties were examined. Both, diiodo-TIPS-diazatetracene and dibromo-TIPSdiazatetracene showed herringbone arrangements, in which the halogen atoms ar...

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Main Authors: Porz, Michael (Author) , Rominger, Frank (Author) , Bunz, Uwe H. F. (Author)
Format: Article (Journal)
Language:English
Published: September 4, 2014
In: Crystal growth & design
Year: 2014, Volume: 14, Issue: 11, Pages: 5962-5965
ISSN:1528-7505
DOI:10.1021/cg5011538
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/cg5011538
Verlag, lizenzpflichtig, Volltext: https://pubs.acs.org/doi/10.1021/cg5011538
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Author Notes:Michael Porz, Frank Rominger, and Uwe H.F. Bunz

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520 |a Four halogenated triisopropylsilylethynyl (TIPS)-tetracene derivatives were synthesized, their single crystal structures and optical and electronic properties were examined. Both, diiodo-TIPS-diazatetracene and dibromo-TIPSdiazatetracene showed herringbone arrangements, in which the halogen atoms are directed toward the nitrogen atoms of a neighboring molecule with slightly lower distances than the van der Waals radii between halogen and nitrogen atoms. Computations of the electrostatic potentials showed the availability and the strength of σ holes, so that we assume a weak halogen−nitrogen bonding. Tribromo-TIPS-diazatetracene delivered a 2D-brick wall structure with no sign of a halogen bonding. Dibromo-TIPS-tetracene crystallized neither in a herringbone nor in a brick wall motif. These results show that for halogenated azaacenes at least weak halogen−nitrogen interactions exist. 
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