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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Isomerism in Complexes
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Polymorphism-driven coordination geometry engineering for boosting nitrate electroreduction in Cu-pyrazolate chains.

Zhanning Liu1, Shanna An1, Qingzhong Xue1

  • 1School of Materials Science and Engineering, Shandong Key Laboratory of Special Epoxy Resin, Shandong University of Science and Technology Qingdao 266590 China znliu@sdust.edu.cn xueqz@upc.edu.cn jiantian@sdust.edu.cn.

Chemical Science
|March 16, 2026
PubMed
Summary
This summary is machine-generated.

Polymorphism in copper-pyrazolate metal-organic frameworks (MOFs) influences catalytic activity. The cis-configured β-Cu(Pz)₂ MOF significantly enhances nitrate reduction reaction efficiency compared to its α-Cu(Pz)₂ polymorph.

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Polymorphism in metal-organic frameworks (MOFs) is a key strategy for tuning catalytic activity.
  • Understanding the structure-activity relationship in MOFs requires isolating the impact of local coordination environments.

Purpose of the Study:

  • To synthesize and characterize two copper-pyrazolate (Cu(Pz)₂) polymorphs with distinct coordination geometries.
  • To investigate the influence of these polymorphs on the electrocatalytic nitrate reduction reaction (NO₃RR).
  • To elucidate the structure-property relationships governing catalytic performance.

Main Methods:

  • Synthesis of α-Cu(Pz)₂ and β-Cu(Pz)₂ polymorphs.
  • Electrochemical evaluation of nitrate reduction reaction (NO₃RR) using synthesized MOFs.
  • Comprehensive structural characterization using X-ray diffraction and other techniques.
  • In situ spectroscopy and density functional theory (DFT) calculations to probe electronic structures and reaction mechanisms.

Main Results:

  • Two distinct copper-pyrazolate (Cu(Pz)₂) polymorphs, α-Cu(Pz)₂ and β-Cu(Pz)₂, were successfully synthesized.
  • The β-Cu(Pz)₂ polymorph exhibited significantly higher faradaic efficiency (93.33%) for NO₃RR compared to α-Cu(Pz)₂ (53.10%).
  • DFT calculations and in situ spectroscopy revealed that the cis-configuration in β-Cu(Pz)₂ leads to more delocalized Cu 3d orbitals and enhanced electronic coupling with nitrate.

Conclusions:

  • MOF polymorphism provides a powerful route to control the local coordination geometry and electronic structure of metal centers.
  • The specific coordination environment in β-Cu(Pz)₂ is crucial for efficient nitrate adsorption and activation in the NO₃RR.
  • This study establishes a fundamental design principle for developing advanced MOF-based electrocatalysts for sustainable nitrogen-cycle chemistry.