TY - JOUR
T1 - Synthesis, characterization, and photophysics of a new trinuclear mercury(II) complex of 1,3,5-triethynylbenzene
AU - Liu, Li
AU - Wong, Wai Yeung
AU - Ho, Cheuk Lam
N1 - Funding Information:
Financial support from a CERG Grant from the Hong Kong Research Grants Council of the Hong Kong SAR, China (Project No. HKBU2048/01P) is gratefully acknowledged.
PY - 2006
Y1 - 2006
N2 - A new trinuclear mercury(ii) complex of 1,3,5-triethynylbenzene [(MeHgC?C)3(1,3,5-C6H3)] 1 was prepared in good yield by Hagihara's dehydrohalogenation reaction of HgMeCl with [(HC?C) 3(1,3,5-C6H3)] under ambient conditions. This trimercury triacetylide complex's structure was confirmed by common spectroscopic techniques and its photophysical properties were examined and compared with the isolobal gold(i) congener [{(PPh3)AuC?C} 3(1,3,5-C6H3)] 2. Our investigations indicate that the organic triplet emissions can be harvested by the heavy-atom effect of mercury which enables efficient intersystem crossing from the S1 singlet excited state to the T1 triplet excited state. The influence of Hg and Au centres on the phosphorescence efficiency and evolution of the lowest electronic singlet and triplet excited states is critically characterized. Both complexes 1 and 2 possess high-energy triplet states of 2.77?2.82 eV, in which the order of intersystem crossing rate follows the order Au > Hg.
AB - A new trinuclear mercury(ii) complex of 1,3,5-triethynylbenzene [(MeHgC?C)3(1,3,5-C6H3)] 1 was prepared in good yield by Hagihara's dehydrohalogenation reaction of HgMeCl with [(HC?C) 3(1,3,5-C6H3)] under ambient conditions. This trimercury triacetylide complex's structure was confirmed by common spectroscopic techniques and its photophysical properties were examined and compared with the isolobal gold(i) congener [{(PPh3)AuC?C} 3(1,3,5-C6H3)] 2. Our investigations indicate that the organic triplet emissions can be harvested by the heavy-atom effect of mercury which enables efficient intersystem crossing from the S1 singlet excited state to the T1 triplet excited state. The influence of Hg and Au centres on the phosphorescence efficiency and evolution of the lowest electronic singlet and triplet excited states is critically characterized. Both complexes 1 and 2 possess high-energy triplet states of 2.77?2.82 eV, in which the order of intersystem crossing rate follows the order Au > Hg.
UR - http://www.scopus.com/inward/record.url?scp=33747680946&partnerID=8YFLogxK
U2 - 10.1071/CH06177
DO - 10.1071/CH06177
M3 - Journal article
AN - SCOPUS:33747680946
SN - 0004-9425
VL - 59
SP - 434
EP - 438
JO - Australian Journal of Chemistry
JF - Australian Journal of Chemistry
IS - 7
ER -