A neutral tetradentate ligand L1 [L1 = 3,6-bis(pyrazol-1-yl)-pyridazine] reacts with Ni(ClO₄)₂·6H₂O and undergoes counterion exchange with PF ⁻₆ to give di- and tetranuclear complexes [Ni₂(L1)₂(CH₃CN)₄](PF₆)₄·4H₂O (1) and [Ni₄(L1)₄(µ-OH)₄](ClO₄)₄·2H₂O (2), respectively. The presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as base controls the nuclearity of the complex formation. Both complexes were structurally characterized by physicochemical and spectroscopic techniques. Their crystal structures revealed that both complexes are centrosymmetric and adopt slightly distorted octahedral geometry. Complex 1 crystallizes in monoclinic space group C2/c as the Ni(II) center is octahedrally bound to L1 in a trans-isomer arrangement. Complex 2 crystallizes in tetragonal space group I4₁/amd with four L1 and four hydroxy bridging ligands linked to Ni(II) center in cis-isomer arrangement. Cyclic voltammograms of complexes 1 and 2 were measured under Ar and CO₂. Under CO₂, the quasireversible peaks of both complexes become irreversible and a current enhancement occurs under reduction.

中性四齿配体L1 [ L1  = 3,6-双（吡唑-1-基）-哒嗪]与Ni（ClO ₄）₂ ·6H ₂ O反应，并与PF ^- ₆进行抗衡离子交换，生成二核和四核配合物[Ni ₂（L1）₂（CH ₃ CN）₄ ]（PF ₆）₄ ·4H ₂ O（1）和[Ni ₄（L1）₄（μ-OH）₄ ]（ClO ₄）₄ ·2H ₂ O （ 2）。1,8-二氮杂双环[5.4.0]十一碳-7-烯（DBU）作为碱的存在控制着复合物形成的核。两种配合物的结构均通过物理化学和光谱技术表征。它们的晶体结构表明这两种络合物都是中心对称的，并采用略微扭曲的八面体几何形状。当Ni（II）中心以反异构体形式八面体结合到L1上时，配合物1在单斜空间群C2 / c中结晶。配合物2在四方空间群I4 ₁ / amd与四个L1中结晶和四个羟基桥联配体以顺式异构体排列连接到Ni（II）中心。在Ar和CO ₂下测量复合物1和2的循环伏安图。在CO ₂的作用下，两种络合物的准可逆峰都变得不可逆，并且在还原作用下发生电流增强。