TY - JOUR
T1 - Synthesis, structure and photophysics of binuclear gold(I) and mercury(II) complexes derived from 2,5-bis(ethynylphenyl)-1,3,4-oxadiazole
AU - WONG, Wai Yeung
AU - Guo, Yan He
N1 - Funding Information:
Financial support from a CERG Grant from the Hong Kong Research Grants Council of the Hong Kong SAR, PR China (Project No. HKBU 2024/04P) and a Faculty Research Grant from the Hong Kong Baptist University (FRG/06-07/II-63) is gratefully acknowledged. We also thank Prof. K.-W. Cheah for the access of the facilities for variable temperature photoluminescence measurements.
PY - 2008/11/12
Y1 - 2008/11/12
N2 - The organometallic chemistry of the dialkyne ligand 2,5-bis(ethynylphenyl)-1,3,4-oxadiazole with gold(I) and mercury(II) salts has been investigated. Four new group 11 gold(I) and group 12 mercury(II) bis(alkynyl) binuclear complexes functionalized with electron-deficient oxadiazole (OXD) spacer [(PR3)AuC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CAu(PR3)] (R = Ph, 1; Me, 2) and [RHgC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CHgR] (R = Ph, 3; Me, 4) were prepared in good yields by the base-catalyzed dehydrohalogenation reaction of the corresponding metal chloride precursors with HC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CH at room temperature. We report the optical absorption and photoluminescence properties of these metallaynes. The structural properties of 1 have been studied by X-ray crystallography, in which no short-contact aurophilic interaction is observed. The influence of the heavy metal atom on the intersystem crossing rate from the S1 singlet excited state to the T1 triplet excited state in these metal alkynyl systems and the spatial extent of the lowest singlet and triplet excitons is systematically characterized. Our investigations indicate that harvesting of the organic triplet emissions by the heavy-atom effect of group 11-12 transition metals generally follows the order Au(I) > Hg(II).
AB - The organometallic chemistry of the dialkyne ligand 2,5-bis(ethynylphenyl)-1,3,4-oxadiazole with gold(I) and mercury(II) salts has been investigated. Four new group 11 gold(I) and group 12 mercury(II) bis(alkynyl) binuclear complexes functionalized with electron-deficient oxadiazole (OXD) spacer [(PR3)AuC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CAu(PR3)] (R = Ph, 1; Me, 2) and [RHgC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CHgR] (R = Ph, 3; Me, 4) were prepared in good yields by the base-catalyzed dehydrohalogenation reaction of the corresponding metal chloride precursors with HC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CH at room temperature. We report the optical absorption and photoluminescence properties of these metallaynes. The structural properties of 1 have been studied by X-ray crystallography, in which no short-contact aurophilic interaction is observed. The influence of the heavy metal atom on the intersystem crossing rate from the S1 singlet excited state to the T1 triplet excited state in these metal alkynyl systems and the spatial extent of the lowest singlet and triplet excitons is systematically characterized. Our investigations indicate that harvesting of the organic triplet emissions by the heavy-atom effect of group 11-12 transition metals generally follows the order Au(I) > Hg(II).
KW - Alkynyl
KW - Crystal structures
KW - Gold
KW - Mercury
KW - Oxadiazole
KW - Phosphorescence
UR - http://www.scopus.com/inward/record.url?scp=53849133795&partnerID=8YFLogxK
U2 - 10.1016/j.molstruc.2008.03.003
DO - 10.1016/j.molstruc.2008.03.003
M3 - Journal article
AN - SCOPUS:53849133795
SN - 0022-2860
VL - 890
SP - 150
EP - 156
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1-3
ER -