Abstract
Two μ3-η2,η2,η2-C 60 complexes, Os3(CO)8(PPh3)(μ3-η 2,η2,η2-C60) (8) and Os3(CO)7(PMe3)2(μ 3-η2,η2,η2-C 60) (9), have been prepared by decarbonylation of Os3(CO)9(μ3-η2,η 2,η2-C60) (6) with Me3NO/MeCN in the presence of phosphine ligands. The molecular structure of 8 has been determined by a single-crystal X-ray diffraction study. The structure of 8 is derived from that of Os3(CO)11(PPh3) by replacing three axial carbonyl ligands with a μ3-face-capping C6 ring of C60. The 13C NMR spectra (C60 region) of 6 and Os3(CO)8(PMe3)(μ3-η 2,η2,η2-C60) (7) show 11 sp2 and 1 sp3 carbon resonances and 29 sp2 and 3 sp3 carbon resonances, respectively, which are consistent with C3v and Cs symmetric nature of the two complexes in solution. Electrochemical properties of 6, 7, and 9 have been studied by cyclic voltammetry (CV) in 1,2-dichlorobenzene (DCB) solutions. The general features of CV curves have revealed four reversible redox couples for 6 and 7 and three for 9 in the DCB potential window. The μ3-η2,η2,η2-C 60 complexes, 6, 7, and 9, show a remarkable electrochemical stability compared to the known η2-C60 triosmium carbonyl complexes. The CV results suggest that a C60-mediated electron transfer to the triosmium center takes place in 6 and 7, but three successive C60-localized reductions occur in 9.
| Original language | English |
|---|---|
| Pages (from-to) | 4477-4483 |
| Number of pages | 7 |
| Journal | Organometallics |
| Volume | 17 |
| Issue number | 20 |
| Publication status | Published - 1998 Sep 28 |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
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Synthesis, structure, and electrochemical studies of μ3-η2,η2,η2-C 60 triosmium complexes. / Song, Hyunjoon; Lee, Kwangyeol; Park, Joon T.; Choi, Moon-Gun.
In: Organometallics, Vol. 17, No. 20, 28.09.1998, p. 4477-4483.Research output: Contribution to journal › Article
TY - JOUR
T1 - Synthesis, structure, and electrochemical studies of μ3-η2,η2,η2-C 60 triosmium complexes
AU - Song, Hyunjoon
AU - Lee, Kwangyeol
AU - Park, Joon T.
AU - Choi, Moon-Gun
PY - 1998/9/28
Y1 - 1998/9/28
N2 - Two μ3-η2,η2,η2-C 60 complexes, Os3(CO)8(PPh3)(μ3-η 2,η2,η2-C60) (8) and Os3(CO)7(PMe3)2(μ 3-η2,η2,η2-C 60) (9), have been prepared by decarbonylation of Os3(CO)9(μ3-η2,η 2,η2-C60) (6) with Me3NO/MeCN in the presence of phosphine ligands. The molecular structure of 8 has been determined by a single-crystal X-ray diffraction study. The structure of 8 is derived from that of Os3(CO)11(PPh3) by replacing three axial carbonyl ligands with a μ3-face-capping C6 ring of C60. The 13C NMR spectra (C60 region) of 6 and Os3(CO)8(PMe3)(μ3-η 2,η2,η2-C60) (7) show 11 sp2 and 1 sp3 carbon resonances and 29 sp2 and 3 sp3 carbon resonances, respectively, which are consistent with C3v and Cs symmetric nature of the two complexes in solution. Electrochemical properties of 6, 7, and 9 have been studied by cyclic voltammetry (CV) in 1,2-dichlorobenzene (DCB) solutions. The general features of CV curves have revealed four reversible redox couples for 6 and 7 and three for 9 in the DCB potential window. The μ3-η2,η2,η2-C 60 complexes, 6, 7, and 9, show a remarkable electrochemical stability compared to the known η2-C60 triosmium carbonyl complexes. The CV results suggest that a C60-mediated electron transfer to the triosmium center takes place in 6 and 7, but three successive C60-localized reductions occur in 9.
AB - Two μ3-η2,η2,η2-C 60 complexes, Os3(CO)8(PPh3)(μ3-η 2,η2,η2-C60) (8) and Os3(CO)7(PMe3)2(μ 3-η2,η2,η2-C 60) (9), have been prepared by decarbonylation of Os3(CO)9(μ3-η2,η 2,η2-C60) (6) with Me3NO/MeCN in the presence of phosphine ligands. The molecular structure of 8 has been determined by a single-crystal X-ray diffraction study. The structure of 8 is derived from that of Os3(CO)11(PPh3) by replacing three axial carbonyl ligands with a μ3-face-capping C6 ring of C60. The 13C NMR spectra (C60 region) of 6 and Os3(CO)8(PMe3)(μ3-η 2,η2,η2-C60) (7) show 11 sp2 and 1 sp3 carbon resonances and 29 sp2 and 3 sp3 carbon resonances, respectively, which are consistent with C3v and Cs symmetric nature of the two complexes in solution. Electrochemical properties of 6, 7, and 9 have been studied by cyclic voltammetry (CV) in 1,2-dichlorobenzene (DCB) solutions. The general features of CV curves have revealed four reversible redox couples for 6 and 7 and three for 9 in the DCB potential window. The μ3-η2,η2,η2-C 60 complexes, 6, 7, and 9, show a remarkable electrochemical stability compared to the known η2-C60 triosmium carbonyl complexes. The CV results suggest that a C60-mediated electron transfer to the triosmium center takes place in 6 and 7, but three successive C60-localized reductions occur in 9.
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M3 - Article
VL - 17
SP - 4477
EP - 4483
JO - Organometallics
JF - Organometallics
SN - 0276-7333
IS - 20
ER -