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<p>Benefits from the pyrazole ligands 4, 5-bis(pyrazole-1-yl) phthalic acid (C<sub>14</sub>N<sub>4</sub>O<sub>4</sub>H<sub>10</sub>), Co(NO)<sub>3</sub>·6H<sub>2</sub>O and Cu(NO)<sub>3</sub>·3H<sub>2</sub>O, four 3D supramolecular compounds ([Co(C<sub>14</sub>N<sub>4</sub>O<sub>4</sub>H<sub>9</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]∙2H<sub>2</sub>O (<b>1</b>), [Co<sub>2</sub>(C<sub>16</sub>N<sub>4</sub>O<sub>4</sub>H<sub>13</sub>)<sub>2</sub>(CH<sub>3</sub>COO)<sub>2</sub>]·C<sub>2</sub>H<sub>5</sub>OH (<b>2</b>), [Co(C<sub>14</sub>N<sub>4</sub>O<sub>4</sub>H<sub>9</sub>)(CH<sub>3</sub>COO)(C<sub>3</sub>H<sub>7</sub>OH)]·C<sub>3</sub>H<sub>7</sub>OH (<b>3</b>)) and [Cu<sub>2</sub>(C<sub>14</sub>N<sub>4</sub>O<sub>4</sub>H<sub>9</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]∙6H<sub>2</sub>O (<b>4</b>) were synthesized. Among them, the ethanol solution in compound <b>2</b> can be used as both solvent and reactant to form 4, 5-bis(pyrazole-1-yl) ethyl phthalate with 4, 5-bis (pyrazole-1-yl) phthalate (C<sub>16</sub>N<sub>4</sub>O<sub>4</sub>H<sub>14</sub>), which is directly synthesized by a one-step method. This study reports a one-step synthesis method for ester compounds, opening new avenues for the synthesis of ester compounds using solvent. Compounds <b>1</b>–<b>4</b> were doped with graphite to prepare a series of composite carbon paste electrodes, and their electrochemical sensing performance toward uric acid, dopamine, and acetaminophen was investigated. Among the four compounds, the modified electrode prepared using <b>1</b> and <b>4</b> exhibited excellent electrochemical sensing performance, high sensitivity, exceptional selectivity, and remarkable recyclability for detecting uric acid (pH = 7), dopamine (pH = 4) and acetaminophen (pH = 7) in PBS solution.</p>

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Four novel Co/Cu-based electrochemical sensors with pyrazole ligand for detection of uric acid, dopamine, and acetaminophen

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Sheng Long,
  • Wei Yao,
  • Bang Yang,
  • Ru Yang,
  • Yunhui Feng,
  • Baotong Xu,
  • Enjun Gao,
  • Vladimir Fedin

摘要

Benefits from the pyrazole ligands 4, 5-bis(pyrazole-1-yl) phthalic acid (C14N4O4H10), Co(NO)3·6H2O and Cu(NO)3·3H2O, four 3D supramolecular compounds ([Co(C14N4O4H9)2(H2O)2]∙2H2O (1), [Co2(C16N4O4H13)2(CH3COO)2]·C2H5OH (2), [Co(C14N4O4H9)(CH3COO)(C3H7OH)]·C3H7OH (3)) and [Cu2(C14N4O4H9)2(H2O)2]∙6H2O (4) were synthesized. Among them, the ethanol solution in compound 2 can be used as both solvent and reactant to form 4, 5-bis(pyrazole-1-yl) ethyl phthalate with 4, 5-bis (pyrazole-1-yl) phthalate (C16N4O4H14), which is directly synthesized by a one-step method. This study reports a one-step synthesis method for ester compounds, opening new avenues for the synthesis of ester compounds using solvent. Compounds 1–4 were doped with graphite to prepare a series of composite carbon paste electrodes, and their electrochemical sensing performance toward uric acid, dopamine, and acetaminophen was investigated. Among the four compounds, the modified electrode prepared using 1 and 4 exhibited excellent electrochemical sensing performance, high sensitivity, exceptional selectivity, and remarkable recyclability for detecting uric acid (pH = 7), dopamine (pH = 4) and acetaminophen (pH = 7) in PBS solution.