Excited States of Triphenylamine-Substituted 2-Pyridyl-1,2,3-triazole Complexes

Gregory S. Huff, Warrick K.C. Lo, Raphael Horvath, Jack O. Turner, Xue Zhong Sun, Geoffrey R. Weal, Hannah J. Davidson, Aaron D.W. Kennedy, C. John McAdam, James D. Crowley, Michael W. George, Keith C. Gordon

Research output: Journal PublicationArticlepeer-review

25 Citations (Scopus)


A new 2-pyridyl-1,2,3-triazole (pytri) ligand, TPA-pytri, substituted with a triphenylamine (TPA) donor group on the 5 position of the pyridyl unit was synthesized and characterized. Dichloroplatinum(II), bis(phenylacetylide)platinum(II), bromotricarbonylrhenium(I), and bis(bipyridyl)ruthenium(II) complexes of this ligand were synthesized and compared to complexes of pytri ligands without the TPA substituent. The complexes of unsubstituted pytri ligands show metal-to-ligand charge-transfer (MLCT) absorption bands involving the pytri ligand in the near-UV region. These transitions are complemented by intraligand charge-transfer (ILCT) bands in the TPA-pytri complexes, resulting in greatly improved visible absorption (λmax = 421 nm and ϵ = 19800 M-1 cm-1 for [Pt(TPA-pytri)Cl2]). The resonance Raman enhancement patterns allow for assignment of these absorption bands. The [Re(TPA-pytri)(CO)3Br] and [Pt(TPA-pytri)(CCPh)2] complexes were examined with time-resolved infrared spectroscopy. Shifts in the CC and CO stretching bands revealed that the complexes form states with increased electron density about their metal centers. [Pt(TPA-pytri)Cl2] is unusual in that it is emissive despite the presence of deactivating d-d states, which prevents emission from the unsubstituted pytri complex.

Original languageEnglish
Pages (from-to)12238-12253
Number of pages16
JournalInorganic Chemistry
Issue number23
Publication statusPublished - 5 Dec 2016

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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