서지주요정보
$C_{60}$- 카비도 펜타오스뮴 클스터 유도체의 합성과 특성화에 관한 연구 = Synthesis and characterization of $C_{60}$-Carbido pentaosmium cluster derivatives
서명 / 저자 $C_{60}$- 카비도 펜타오스뮴 클스터 유도체의 합성과 특성화에 관한 연구 = Synthesis and characterization of $C_{60}$-Carbido pentaosmium cluster derivatives / 이창훈.
저자명 이창훈 ; Lee, Chang-Hoon
발행사항 [대전 : 한국과학기술원, 2000].
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8010747

소장위치/청구기호

학술문화관(문화관) 보존서고

MCH 00022

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초록정보

$Os_5C(CO)_{11}$($\mu_3$-$\eta^2$,$\eta^2$,$\eta^2$-$C_{60}$)$PPh_3$ (1) and $Os_5C(CO)_{12}$(\mu-$\eta^2$,$\eta^2$-$C_{60}$)$PPh_3$ (2) have been prepared by the reaction of $Os_5C(CO)_{12}PPh_3(NCMe)_2$ with $C_{60}$ in refluxing chlorobenzene. The molecular structure of 2 reveals the first example of \mu-$\eta^2$,$\eta^2$-$C_{60}$ bonding mode of $C_{60}$-metal cluster derivative. Uncoordinated double bond in the $C_6$ ring is disposed away from the $Os_3$ triangle. Furthermore, it was demonstrated that \mu-$\eta^2$,$\eta^2$-$C_{60}$ and $\mu_3$-$\eta^2$,$\eta^2$,$\eta^2$-$C_{60}$ ligands of 1 and 2 are reversibly interconvertible. Reaction of 1 with benzyl isocyanide at room temperature produces an addition product $Os_5C(CO)_{11}(CNCH_2C_6H_5)$ $(\mu_3-\eta^2,\eta^2,\eta^2-C_{60})$ $PPh_3$ (3). One $Os_{apical}-Os_{basal}$ bond in square pyramidal $Os_5C$ framework of 1 is cleaved by the addition of 2e- donor benzyl isocyanide ligand. Heating a chlorobenzene solution of the kinetic isomer 3 at 100℃ gave the thermodynamic product $Os_5C(CO)_{11}(CNCH_2C_6H_5)$ (\mu-$\eta^{2}$,$\eta^2$-$C_{60}$)$PPh_3$ (4). In contrast to 2, however, the $C_6$ ring of 4 positions centrally over the $Os_3$ triangle as observed in 1. Substitution of a carbonyl ligand of 4 with MeCN and subsequent thermolysis compound gives $Os_5C(CO)_{10}(CNCH_2}C_6H_5)(C_{60})PPh_3$ (5), which is assumed to have the $\mu_3$-$\eta^2$,$\eta^2$,$\eta^2$-C$_{60}$ bonding mode and the ligand disposition similar to that of 4. Compound 5 is also produced by substitution of a carbonyl ligand of 4 with benzyl isocyanide. Compounds 4 and 5 are also reversibly interconvertible.

서지기타정보

서지기타정보
청구기호 {MCH 00022
형태사항 v, 35 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Chang-Hoon Lee
지도교수의 한글표기 : 박준택
지도교수의 영문표기 : Joon-Taik Park
학위논문 학위논문(석사) - 한국과학기술원 : 화학과,
서지주기 참고문헌 : p. 33-35
주제 $\mu_3$-$\eta^2$
$\eta^2$
$\eta^2$-C$_{60}$
$\mu$-$\eta^2$
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