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학술발표회초록보기

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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis, characterization and reactivity of high-spin nickel(II)-borohydride complex

등록일
2016년 2월 18일 16시 45분 55초
접수번호
1734
발표코드
INOR.P-103 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 22일 (금요일) 13:00~14:30
발표형식
포스터
발표분야
무기화학
저자 및
공동저자
탁현우, 조재흥*
대구경북과학기술원(DGIST) 신물질과학, Korea
Synthetic chemists have long appreciated a huge number of reactions of transition metal hydride complexes, especially in reductions. A nickel(II)–borohydride complex bearing a macrocyclic tridentate N-donor ligand, [Ni(Me3-TACN)(BH4)(CH3CN)]+ (2) (Me3-TACN = 1,4,7-trimethyl-1,4,7-triazacyclononane), was prepared, isolated, and characterized by various physicochemical methods, including UV-vis, ESI-MS, IR and X-ray analyses. The X-ray crystal structure of [Ni(Me3-TACN)(BH4)(CH3CN)](BPh4) (2-(BPh4)) reveals that the borohydride ligand coordinates in a symmetrical η2-fashion. The complex is paramagnetic with an effective magnetic moment of 2.9 μB consistent with a d8 high-spin system. 2 is capable of performing dehalogenation reactions. The reactivity of 2 was further investigated using para-substituted benzoyl chloride, which has a series of electrondonating and withdrawing substituents at the para-position of the phenyl group (para-X-Ph-COCl; X = MeO, tBu, H, Cl, NO2). The Hammett plot of the second-order rate constants vs. σp+ gave a ρ value of 1.2. The positive ρ value is consistent with the process involving a nucleophilic character.

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