N-heterocyclic carbene Pt(II) complexes from caffeine: Synthesis, structures and photoluminescent properties

Jian Jin Hu, Shi Qiang Bai, Hsiu Hsuan Yeh, David J. Young, Yun Chi, T. S.Andy Hor

Research output: Contribution to journalArticle

Abstract

The caffeine-derived N-heterocyclic carbene (NHC) complex [Pt II(CN)(NHC)Cl] (CN = 2-phenylpyridine), 4 has the opposite stereochemistry and a shorter Pt-Ccarbene bond compared to that of an analogous benzimidazole-derived N,N-heterocyclic carbene (NNHC) Pt complex 2. These suggest a lower trans influence of pyridyl N compared to cyclometallated carbon and an increased Pt-NHC π-backbonding because of decreased π-donation resulting from conjugation to the electron deficient pyrimidine of caffeine. Complex 4 has a lower emission quantum yield (Φ) and is blue-shifted into the green region of the visible spectrum relative to non-carbene Pt(II) cyclometalated complex 5.

Original languageEnglish
Pages (from-to)4402-4406
Number of pages5
JournalDalton Transactions
Volume40
Issue number17
DOIs
Publication statusPublished - 7 May 2011
Externally publishedYes

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