Thiolate-Bridged Nickel–Iron and Nickel–Ruthenium Complexes Relevant to the CO-Inhibited State of [NiFe]-Hydrogenase

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• 作者：Puhua Sun ; Dawei Yang ; Ying Li ; Yahui Zhang ; Linan Su ; Baomin Wang ; Jingping Qu
• 刊名：Organometallics
• 出版年：2016
• 出版时间：March 14, 2016
• 年：2016
• 卷：35
• 期：5
• 页码：751-757
• 全文大小：407K
• ISSN：1520-6041

文摘

By employing S(CH₂CH₂S^–)₂ (tpdt) and O(CH₂CH₂S^–)₂ (opdt) as bridging ligands, two nickel–iron and two nickel–ruthenium heterodimetallic complexes, [Cp*M(μ-1κ³SSS′:2κ²SS-tpdt)Ni(dppe)][PF₆] (1, M = Fe; 3, M = Ru) and [Cp*M(μ-1κ³SSO:2κ²SS-opdt)Ni(dppe)][PF₆] (2, M = Fe; 4, M = Ru) (Cp* = η⁵-C₅Me₅; dppe = Ph₂P(CH₂)₂PPh₂), were obtained by a one-pot synthetic method and were identified by spectroscopy and X-ray crystallography. At 1 atm of CO, the pendant oxygen atom dissociated from the iron or ruthenium center and rapidly transferred to the nickel center when a CO molecule attacked the iron or ruthenium center in 2 and 4. However, there was no similar reaction occurring in 1 and 3 with the pendant sulfur atom. We confirmed the solid-state structure of the CO complex [Cp*Fe(t-CO)(μ-1κ²SS:2κ³SSO-opdt)Ni(dppe)][PF₆] (5), which represents a possible configuration in the CO-inhibited state of [NiFe]-hydrogenase and exhibits no catalytic activity in electrochemical proton reduction.