Relating Estrada index with spectral radius

Ivan Gutman, Slavko Radenković, Boris Furtula, Toufik Mansour, Matthias Schork

Research output: Contribution to journalArticlepeer-review


The Estrada index EE is a recently proposed molecular structure-descriptor, used in the modeling of certain features of the 3D structure of organic molecules, in particular of the degree of folding of proteins and other long-chain biopolymers. The Estrada index is computed from the spectrum of the molecular graph. Therefore, finding its relation with the spectral radius r (= the greatest graph eigen-value) is of interest, especially because the structure-dependency of r is relatively well understood. In this work, the basic characteristics of the relation between EE and r, which turned out to be much more complicated than initially anticipated, was determined.

Original languageEnglish
Pages (from-to)1321-1327
Number of pages7
JournalJournal of the Serbian Chemical Society
Issue number12
StatePublished - 2007


  • Estrada index
  • Graph spectrum
  • Molecular graph
  • Spectral radius

ASJC Scopus subject areas

  • Chemistry (all)


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