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Size- and Charge-Matching Effect between Oxaporphyrin Core and Central Metal on the Stability of Cuprous Ion
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  • Qiuhua Liu,
  • Junhao Gao,
  • Qin Lin,
  • Borong Liao,
  • Qian Zhang,
  • Zaichun Zhou
Qiuhua Liu
Hunan University of Science and Technology
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Junhao Gao
Hunan University of Science and Technology
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Qin Lin
Hunan University of Science and Technology
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Borong Liao
Hunan University of Science and Technology
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Qian Zhang
Hunan University of Science and Technology
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Zaichun Zhou
Hunan University of Science and Technology

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Abstract

Cuprous (I) catalysts have been widely used in the coupling reaction of forming C-X bond. The core-modified porphyrins are known to stabilize the unusual oxidation state of many metals. Thus, in this work, a 21-oxaporphyrin was obtained under the improved Adler–Longo condensation condition and successfully used for complexing the cuprous ion. It is found that the synergy of the two factors, the diameter expansion and the univalent form of the N₃O core in the ligand, plays a decisive role in stabilizing the metastable ion, the former effectively stabilizes the electron pair of the equatorial d orbital by aiding the d-π interaction, and the latter exactly balances the single charge of the ion. A size axis of copper species in porphyrinate systems is established by comparing with two previously reported distorted copper (II) porphyrin series.