Twisted tethered tolanes: unanticipated long-lived phosphorescence at 77 K

J Am Chem Soc. 2013 Feb 13;135(6):2160-3. doi: 10.1021/ja400416r. Epub 2013 Jan 30.

Abstract

Influencing the communication within a conjugated system as diphenylacetylene is a challenging subject in molecular electronics. Some examples of twisted tolanes are known, where high twists have been achieved in the solid state by steric encumbrance. The insertion of a spacer system is an alternative way to tailor rotation. Only a few examples of such tethered tolanes exist, and they all suffer from small twist angles (<35°). We report on tolanophanes containing a malonyl tether, where twist angles of almost 80° were reached. Long-lived phosphorescence (4 s at 77 K) was recorded, and quantum-chemical calculations were performed to confirm the experimental results.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crystallography, X-Ray
  • Fluorescence*
  • Ketones / chemical synthesis
  • Ketones / chemistry*
  • Models, Molecular
  • Molecular Structure
  • Quantum Theory
  • Temperature*

Substances

  • Ketones