Synthesis, structure, and hydrogen evolution studies of a heteroleptic Co(III) complex

Synthesis, structure, and hydrogen evolution studies of a heteroleptic Co(III) complex
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杂配Co(III)配合物的合成、结构和析氢研究

DOI:
10.1016/j.ica.2020.120195
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发表时间:
2021
影响因子:
2.8
通讯作者:
Hamaker, Christopher G.
Hamaker, Christopher G.
中科院分区:
化学3区
文献类型:
--
作者:
Celestine, Michael J.;Lawrence, Mark A.W.;Schott, Olivier;Picard, Vincent;Hanan, Garry S.;Marquez, Emily M.;Harold, Chekeyl G.;Kuester, Cole T.;Frenzel, Blaise A.;Hamaker, Christopher G.

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以tpy和phen为原料,一锅法合成了[Co(tpy)(phen)Cl](PF 6)2·0.25CH3CN(其中tpy = 2,2 ′;6′,2 ″-三联吡啶,phen = 1,10-菲咯啉).配合物[Co(tpy)(phen)Cl](PF 6)2·0.25CH3CN的结构经元素分析、高分辨质谱(HRMS)、各种光谱分析和X射线晶体学确证。密度泛函理论计算也进行了。[Co(tpy)(phen)Cl](PF 6)2·0.25CH3CN的晶体结构为单斜晶系,空间群为aC 2/c。在乙腈中获得的循环伏安图显示可逆的CoIII/II、CoII/I和CoI/0分别与基于配体的氧化还原电对混合,E1/2 =+0.35、-0.81和-1.37 V(vs Ag/AgCl)。在对氰基苯胺四氟硼酸盐存在下,以乙腈为溶剂,[Co(tpy)(phen)Cl](PF 6)2·0. 25 CH 3CN在830 mV的过电位下表现出电催化析氢活性,在伏安图中观察到一个催化波,并在控制电位电解实验的反应器顶空中检测到氢气. [Co(tpy)(phen)Cl](PF 6)2·0.25CH3CN的光催化析氢研究产生的转换频率(TOF)为3300 mmol H2 mol −1CATmin− 1,而[Co(dmgH)2(py)Cl](其中dmgH =二甲基乙醛酸)在相同条件下的TOF为4500 mmol H2.mol−1CATmin− 1。[Co(tpy)(phen)Cl](PF 6)2·0.25CH3CN在DMF中约3 h的转化数(TON)为79,而[Co(dmgH)2Cl(py)]为141。
[Co(tpy)(phen)Cl](PF6)2•0.25CH3CN (where tpy = 2,2′;6′,2″-terpyridine and phen = 1,10-phenanthroline) was prepared from a one pot mixture involving stoichiometric quantities of tpy and phen. The structure of [Co(tpy)(phen)Cl](PF6)2•0.25CH3CN was confirmed by elemental analysis, high resolution mass spectroscopy (HRMS), various spectroscopic analyses, and X-ray crystallography. Density functional theory calculations were also carried out. The crystal structure of [Co(tpy)(phen)Cl](PF6)2•0.25CH3CN, which was grown from acetonitrile, revealed a monoclinic crystal system with aC2/cspace group. The cyclic voltammogram which was acquired in acetonitrile revealed reversible CoIII/II, CoII/I, and CoI/0mixed with ligand-based redox couples atE½= +0.35, –0.81, and –1.37 V (vs Ag/AgCl), respectively. In the presence ofp-cyanoanillinium tetrafluoroborate with acetonitrile as the solvent, [Co(tpy)(phen)Cl](PF6)2•0.25CH3CN displayed electrocatalytic hydrogen evolution activity at a 830 mV overpotential, as evidenced by a catalytic wave which was observed in the voltammogram, and by the detection of hydrogen in the headspace of the reaction vessel of a controlled potential electrolysis experiment. Photocatalytic hydrogen evolution studies with [Co(tpy)(phen)Cl](PF6)2•0.25CH3CN produced a turnover frequency (TOF) of 3300 mmol H2mol−1CATmin−1when compared to [Co(dmgH)2(py)Cl] (where dmgH = dimethylglyoximato), which had a TOF of 4500 mmol H2.mol−1CATmin−1under the same conditions. [Co(tpy)(phen)Cl](PF6)2•0.25CH3CN produced a turnover number (TON) of 79 when compared to 141 for [Co(dmgH)2Cl(py)] in DMF in ca 3 h.
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