Three coordination complexes, [Cu(L¹)(2,2–bipy)]_2n·3nH₂O (1), [Cu(L¹)(2,2–bipy)₂]·xH₂O (2: x = 3.5 and 3: x = 5), were synthesized by reactions of the flexible ligand 1,1´-methylenebis(5-methyl-pyrazole-4-carboxylic acid) (H₂L¹) and coligands 2,2'–bipyridyl (2,2-bipy) with Cu(OAc)₂·H₂O in different reaction condition, respectively. The structures of these complexes were established by elemental analysis, IR and single-crystal X-ray diffraction analysis. Complex 1 possessed a one-dimensional (1D) chainlike structure, (L¹)²⁻ group exhibited trans-configuration and coordinated to Cu(II) ions by carboxylate O atoms in µ₂^–k:O,O′; k:O′′′,O′′′ mode. In the similar subjectival structure of 2 and 3, (L¹)²⁻ anions also presented trans-configuration, but only one carboxylate group chelated to a Cu(II) ion, and the other carboxylate group remains free in a deprotonated form. The 1D chains in 1 were further assembled to a 3D supramolecular architecture via intermolecular C–H···O hydrogen bond. The mononuclear zwitterionic complexes 2 and 3 are further assembled into a 2D/3D supramolecular architecture by intermolecular hydrogen bonds and π···π interaction. The thermal and photoluminescent properties of 1–3 in the solid state have also been investigated.

三种配位配合物，[Cu(L ¹ )(2,2-bipy)] _{2 n} ·3nH ₂ O ( 1 ), [Cu(L ¹ )(2,2-bipy) ₂ ]· x H ₂ O ( 2 ) : x = 3.5 和3 : x  = 5)，通过柔性配体 1,1'-亚甲基双（5-甲基-吡唑-4-羧酸）（H ₂ L ¹）和配体 2,2' 的反应合成– 联吡啶 (2,2-bipy) 与 Cu(OAc) ₂ ·H ₂O 分别在不同的反应条件下。这些配合物的结构是通过元素分析、IR 和单晶 X 射线衍射分析确定的。配合物1具有一维 (1D) 链状结构，(L ¹ ) ²⁻基团呈现反式构型，并通过μ ₂ ^– k :O,O' 中的羧酸根 O 原子与 Cu(II) 离子配位；k :O''',O'''模式。在2和3相似的主观结构中，(L ¹ ) ²⁻阴离子也呈现反式- 构型，但只有一个羧酸根与 Cu(II) 离子螯合，而另一个羧酸根以去质子化形式保持游离状态。1中的1D链通过分子间C-H···O氢键进一步组装成3D超分子结构。单核两性离子配合物2和3通过分子间氢键和π … π相互作用进一步组装成2D/3D超分子结构。的热和光致发光性质1 - 3在固体状态也进行了研究。