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

Please use this identifier to cite or link to this item: https://doi.org/10.1039/c0dt01380c

Title:	N-heterocyclic carbene Pt(ii) complexes from caffeine: Synthesis, structures and photoluminescent properties
Authors:	Hu, J.J. Bai, S.-Q. Yeh, H.H. Young, D.J. Chi, Y. Hor, T.S.A.
Issue Date:	7-May-2011
Citation:	Hu, J.J., Bai, S.-Q., Yeh, H.H., Young, D.J., Chi, Y., Hor, T.S.A. (2011-05-07). N-heterocyclic carbene Pt(ii) complexes from caffeine: Synthesis, structures and photoluminescent properties. Dalton Transactions 40 (17) : 4402-4406. ScholarBank@NUS Repository. https://doi.org/10.1039/c0dt01380c
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. © 2011 The Royal Society of Chemistry.
Source Title:	Dalton Transactions
URI:	http://scholarbank.nus.edu.sg/handle/10635/94362
ISSN:	14779226
DOI:	10.1039/c0dt01380c
Appears in Collections:	Staff Publications

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