Synthesis of bridging hydrides of phenyl-functionalized diiron propanedithiolate complexes with 1,2-bis(diphenylphosphine)ethylene or 1,2-bis(diphenylphosphine)ethane ligands
作者:Chang-Gong Li、Gao-Feng Zhang、Yong Zhu、Feng Xue、Jing-Yan Shang、Mao-Jin Cui、Tian-Jun Lou
DOI:10.1007/s11243-015-9937-y
日期:2015.8
Reaction of 2-phenyl-1,3-dibromopropane with in situ generated (μ-SLi)2Fe2(CO)6 yielded a known complex [(μ-SCH2)2CHC6H5]Fe2(CO)6 (A). Displacement of two carbonyls from complex A by cis-1,2-bis(diphenylphosphine)ethylene (dppv) or 1,2-bis(diphenylphosphine)ethane (dppe) in the presence of Me3NO·2H2O gave two chelate complexes [(μ-SCH2)2CHC6H5]Fe2(CO)4(κ 2-dppv), [A(κ 2-dppv)] and [(μ-SCH2)2CHC6H5]Fe2(CO)4(κ 2-dppe), [A(κ 2-dppe)], respectively. Protonation of the diiron centers of [A(κ 2-dppv)] and [A(κ 2-dppe)] using an excess of HBF4·Et2O in dichloromethane at room temperature gave the bridging hydrides [(μ-H)A(κ 2-dppv)]BF4 and [(μ-H)A(κ 2-dppe)]BF4. The complexes [(μ-H)A(κ 2-dppv)]BF4, [A(κ 2-dppe)] and [(μ-H)A(κ 2-dppe)]BF4 were characterized by elemental analysis and spectroscopic methods, and [(μ-H)A(κ 2-dppv)]BF4 and [(μ-H)A(κ 2-dppe)]BF4 were also characterized by X-ray crystallography. The electrochemical behavior of [(μ-H)A(κ 2-dppv)]BF4 was investigated by cyclic voltammetry, and the catalytic electrochemical reduction in protons from trifluoroacetic acid or p-methylbenzene sulfonic acid to give hydrogen was investigated.
2-苯基-1,3-二溴丙烷与原位生成的 (μ-SLi)₂Fe₂(CO)₆ 的反应生成了已知的络合物 [(μ-SCH₂)₂CHC₆H₅]Fe₂(CO)₆ (A)。在存在 Me₃NO·2H₂O 的条件下,用顺式 1,2-二(二苯基膦)乙烯 (dppv) 或 1,2-二(二苯基膦)乙烷 (dppe) 取代络合物 A 中的两个羰基,分别得到了两个配位络合物 [(μ-SCH₂)₂CHC₆H₅]Fe₂(CO)₄(κ²-dppv),[A(κ²-dppv)] 和 [(μ-SCH₂)₂CHC₆H₅]Fe₂(CO)₄(κ²-dppe),[A(κ²-dppe)]。在室温下,使用过量的 HBF₄·Et₂O 在二氯甲烷中对 [A(κ²-dppv)] 和 [A(κ²-dppe)] 的二铁中心进行质子化,生成了桥接氢化物 [(μ-H)A(κ²-dppv)]BF₄ 和 [(μ-H)A(κ²-dppe)]BF₄。络合物 [(μ-H)A(κ²-dppv)]BF₄、[A(κ²-dppe)] 和 [(μ-H)A(κ²-dppe)]BF₄ 通过元素分析和光谱方法进行了表征,其中 [(μ-H)A(κ²-dppv)]BF₄ 和 [(μ-H)A(κ²-dppe)]BF₄ 还通过 X 射线晶体学进行了表征。通过循环伏安法研究了 [(μ-H)A(κ²-dppv)]BF₄ 的电化学行为,并研究了从三氟乙酸或对甲基苯磺酸中质子向氢的催化电化学还原反应。