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A kind of mononuclear cobalt complex, its preparation method and application

A cobalt complex and mononuclear technology, which is applied in the direction of cobalt organic compounds, chemical instruments and methods, and compounds containing elements of group 8/9/10/18 of the periodic table, can solve the problems of increasing costs, being unable to exist stably, and being unable to Adapt to oxidation conditions and other issues to achieve strong binding and degradation resistance, broad solubility, enhanced geometry-dependent redox properties

Active Publication Date: 2022-05-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the current metal complexes mainly choose noble metals to reduce the requirements for ligand performance, but this undoubtedly increases the cost; or choose the first row of transition metals, but the typical ligand selection for this type of metal is due to lack of sufficient electron donor power, or It cannot adapt to oxidation conditions, cannot exist stably in the catalytic water oxidation process, is prone to degradation, or can only catalyze in an alkaline environment, which cannot meet the actual needs

Method used

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  • A kind of mononuclear cobalt complex, its preparation method and application
  • A kind of mononuclear cobalt complex, its preparation method and application
  • A kind of mononuclear cobalt complex, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 0.74mmol of cobalt acetate tetrahydrate (183mg) and 0.74mmol of bipyalk (200mg) (molar ratio 1:1) in 30mL of ethanol, heat to 50°C under reflux and stir for 6 hours in a dark environment, and the reaction is over Finally, take out the rotary evaporation to the remaining 3mL, add 5mL of n-hexane, and crystallize at -40°C in a dark environment to obtain a mononuclear cobalt complex with a yield of 82%.

[0028] The mononuclear cobalt complex was detected by high-resolution mass spectrometry (ESI-MS(CH 3 OH) see figure 1 ):m / z 330.07663[M-2OAc] 2+ .

Embodiment 2

[0030] Dissolve 1.09mmol of cobalt acetate tetrahydrate (272mg) and 0.90mmol of bipyalk (246mg) (molar ratio: 11:9) in 30mL of ethanol, heat to 50°C under reflux and stir for 6 hours in a dark environment, and the reaction is over Finally, take out the rotary evaporation to the remaining 4mL, add 6mL of n-hexane, and crystallize in a light-proof environment at -45°C to obtain a mononuclear cobalt complex with a yield of 95%. The mass spectrum of the obtained product is completely consistent with that of Example 1.

[0031] Application Test 1

[0032] The mononuclear cobalt complex prepared in the above example 1 is used for electrocatalytic oxidation of water to prepare oxygen. The test method is: add 25 μmol of the mononuclear cobalt complex to 0.1M Bu 4 NPF 6 (DMF solution) (50mL), use an electrochemical workstation to carry out the electrocatalytic water oxidation test (cyclic Volt-ampere test), CV test results see figure 2 , Bu 4 NPF 6 is tetrabutylammonium hexafluor...

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Abstract

The invention discloses a mononuclear cobalt complex, whose general chemical formula is Co(bipyalk)(OAc) 2 , wherein, bipyalk is 2,2'-([2,2'-bipyridine]-6,6'-dimethyl)bis(propan-2-alcohol), and OAc is acetic acid free radical. The invention also discloses the preparation method and application of the mononuclear cobalt complex. The mononuclear cobalt complex can catalyze and oxidize water to prepare oxygen under the condition of electrocatalysis.

Description

technical field [0001] The invention relates to a mononuclear cobalt complex, a preparation method and application thereof, and belongs to the field of electrocatalysts. Background technique [0002] In the context of artificial photosynthesis, the oxygen evolution reaction (OER, 2H 2 O→O 2 +4H + +4e - ) is a particularly challenging reaction and is a bottleneck in the kinetics of direct storage of solar energy in chemical fuels through the process of water splitting. Due to the difficulty of multistep electron / proton transfer via O–O bond formation, the reaction kinetics are sluggish; therefore, active and stable catalysts are required to lower this barrier to promote highly active and fast water oxidation reactions in aqueous media. [0003] The use of complexes of the noble metals ruthenium and iridium as water oxidizers has been studied to some extent, so finding cheap and earth-abundant first-row analogues as alternatives is very attractive. Metal complex catalysts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F15/06C25B11/085C25B1/04
CPCC07F15/065C25B1/04Y02E60/36
Inventor 苏云飞于振涛
Owner NANJING UNIV
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