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

J J Hu; S Q Bai; H H Yeh; David James Young; Y Chi; T S A Hor

doi:10.1039/c0dt01380c

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

Journal article

Peer reviewed

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

J J Hu, S Q Bai, H H Yeh, David James Young, Y Chi and T S A Hor

Dalton transactions (Cambridge, England : 2003), Vol.40(17), pp.4402-4406

2011

DOI: https://doi.org/10.1039/c0dt01380c

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Abstract

back-bonding

benzimidazoles

blue-shifted

carbenes

cyclometalated complexes

electron-deficient

emission quantum yield

green regions

n-heterocyclic carbenes

photo-luminescent properties

pt complexes

pyridyl

trans influence

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..

Details

Title: N-heterocyclic carbene Pt(ii) complexes from caffeine: Synthesis, structures and photoluminescent properties
Authors: J J Hu (Author) - National University of Singapore, Singapore
S Q Bai (Author) - National University of Singapore, Singapore
H H Yeh (Author) - National Tsing Hua University, Taiwan
David James Young (Author) - National University of Singapore, Singapore
Y Chi (Author) - National Tsing Hua University, Taiwan
T S A Hor (Author) - National University of Singapore, Singapore
Publication details: Dalton transactions (Cambridge, England : 2003), Vol.40(17), pp.4402-4406
Publisher: Royal Society of Chemistry (R S C) Publications
Date published: 2011
DOI: 10.1039/c0dt01380c
ISSN: 1477-9226
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449171102621
Output Type: Journal article

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