What do the azobenzene oligomer helixes have to do with the Golden Ratio?

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Azobenzene (di-phenyl-diazene) is a widely-studied prototype for its photoisomerisation capability. Whereas the trans-azobenzene is perfectly planar, the cis conformer assumes an inherent helicity, caused by the steric hindrance of each of the two benzene rings. In this study we explore by first principle DFT calculations the structural, mechanical, and chiroptical properties (Electronic Circular Dichroism spectra, ECD) of n-(phenylazo)-azobenzenes (n=. 1-10) from a computational point of view. The idea is that these polymers may photo-switch from a "strip"-like conformation (when each monomer is trans) to a "spring"-like conformation (when each monomer is cis). By studying the mechanical properties of these photo-induced nano-springs, we surprisingly obtain a nexus between the geometrical and elastic parameters and the Golden Ratio.

Original languageEnglish
Pages (from-to)13-23
Number of pages11
JournalComputational and Theoretical Chemistry
Volume1014
DOIs
Publication statusPublished - 5 Jun 2013
Externally publishedYes

Fingerprint

oligomers
Oligomers
helices
monomers
mechanical properties
Conformations
Monomers
dichroism
Photoisomerization
strip
switches
benzene
prototypes
Circular Dichroism
Benzene
Discrete Fourier transforms
Electronic properties
rings
Polymers
polymers

Keywords

  • Azobenzene derivatives
  • Density Functional Theory (DFT)
  • Golden Ratio
  • Photo-switcher

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Biochemistry
  • Condensed Matter Physics

Cite this

What do the azobenzene oligomer helixes have to do with the Golden Ratio? / Benassi, Enrico.

In: Computational and Theoretical Chemistry, Vol. 1014, 05.06.2013, p. 13-23.

Research output: Contribution to journalArticle

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