Co(III) Complexes with N<sub>2</sub>S<sub>3</sub>-Type Ligands as Structural/Functional Models for the Isocyanide Hydrolysis Reaction Catalyzed by Nitrile Hydratase
作者:Takuma Yano、Yuko Wasada-Tsutsui、Tomohiro Ikeda、Tomonori Shibayama、Yuji Kajita、Tomohiko Inomata、Yasuhiro Funahashi、Tomohiro Ozawa、Hideki Masuda
DOI:10.1021/acs.inorgchem.6b02324
日期:2018.4.16
It has been before reported that, in addition to hydration of nitriles, the Fe-type nitrile hydratase (NHase) also catalyzes the hydrolysis of tert-butylisocyanide (tBuNC). In order to investigate the unique isocyanide hydrolysis by NHase, we prepared three related Co(III) model complexes, PPh4[Co(L)] (1), PPh4[Co(L-O3)] (2), and PPh4[Co(L-O4)] (3), where L is bis(N-(2-mercapto-2-methylpropionyl)aminopropyl)sulfide
之前已经报道,除了腈的水合以外,Fe型腈水合酶(NHase)还催化叔丁基异氰化物(t BuNC)的水解。为了研究NHase独特的异氰酸酯水解作用,我们制备了三种相关的Co(III)模型配合物:PPh 4 [Co(L)](1),PPh 4 [Co(L -O 3)](2)和PPh 4 [Co(L -O 4)](3),其中L为双(N-(2-巯基-2-甲基丙酰基)氨基丙基)硫化物。后缀L-O 3和L -O 4分别表示亚磺酸盐和亚磺酸盐以及两个亚磺酸盐的配体,而不是L的两个硫醇盐。对1和3的X射线分析分别显示了三角双锥体和方形锥体结构。复杂2,然而,有五个坐标三角-双锥与η 2通过氧硫基型S-O的协调。的加成吨BuNC到1,2,和3形成八面体Co(III)配合物会导致吸收光谱发生变化。PPh 4 [Co(L -O 4)(t BuNC)](4)和(PPh 4)2 [Co(L -O 4)(CN)](5)