Syntheses, Characterization and Application of Fullerene-Metal Cluster Derivatives = 풀러렌-금속 클러스터 유도체의 합성과 특성 및 응용에 관한 연구

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Benzyl Isocyanide substituted $C_{60}-triosmium$ complexes, $Os_3(CO)_{9-n}(CNCH_Ph)_n(μ_3-η^2:η^2:η^2-C_{60})$ (n = 2(II-3), 3(II-4), and 4(II-5)), have been prepared by reactions of either $Os_3(CO)_9(μ_-η^2:η^2:η^2-C_{60})$ (II-1) or its lower isocyanide substituted complexes with appropriate amounts of (triphenylphosphino)benzylimine $(PhCH_2N=PPh_3)$. Compounds II-3~II-5 have been characterized by spectroscopic $(IR, MS, ^1H-, ^{13}C-NMR)$ methods, cyclic voltammetry, and X-ray diffraction studies. Single-crystal X-ray diffraction studies reveal that isomer II-3a has two inequivalent equatorial isocyanide ligands as cis,trans-1,2-isomer and isomer II-4a has three equivalent equatorial isocyanide ligands as 1,2,3-isomer with a $C_3$ symmetry. In compound II-5, one benzyl isocyanide is axially coordinated to an osmium atom, whereas the other three benzyl isocyanide ligands are equatorially coordinated to each osmium atom. $^1H$ and $^{13}C-NMR$ data, however, indicate that compound II-3 exists as a mixture of 1,2- (II-3a) and 1,1-isomers (II-3b) in a ratio of 7:1, compound II-4 as a mixture of 1,2,3- (II-4a) and 1,1,2-isomers (II-4b) in a ratio of 1:1, and compound II-5, interestingly, as a single species of 1,1,2,3-isomer in solution. The cyclic voltammetric studies reveal that all the CVs of II-3~II-5 and related $Os_3(CO)_8(CNCH_2Ph)(μ_3-η^2:η^2:η^2-C_{60})$ (II-2) show four reversible redox waves that correspond to one-electron process each with the third and fourth waves overlapped within the chlorobenzene solvent potential window. As more isocyanide ligands are coordinated in II-2~II-5, all the corresponding half-wave potentials are gradually shifted to more negative potentials, reflecting the electron-donor property of the isocyanide ligand. Furthermore, $C_{60}$ -mediated electron delocalization from $C_60$ to the triosmium center takes place in the trianionic species of II-2~II-5 and the two isomers in II-3 and II-4 undergo an equivalent electrochem...
Advisors
Park, Joon-Taikresearcher박준택researcher
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2006
Identifier
465262/325007  / 020015226
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2006.8, [ vii, 105 p ]

Keywords

Photovoltaic cell; Substitution Chemistry; Metal Cluster; Fullerene; Photoinduced electron transfer; 분자전자소자; 광전지; 치환반응; 금속 뭉치화합물; 풀러렌; Molecular electronics.

URI
http://hdl.handle.net/10203/31769
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=465262&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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