Abstract A novel tetranuclear copper(II) complex, [Cu(H2O)5][Cu4(cpdp)2(adip)]ClBr∙2CH3OH·8H2O (1) of carboxylate-based symmetrical multidentate ligand, H3cpdp [H3cpdp = N,N'-Bis[2-carboxybenzomethyl]-N,N'-Bis[2-pyridylmethyl]-1,3-diaminopropan-2-ol; adip = adipate], has been synthesized and fully characterized. Complex 1 has been synthesized by carrying out reaction of ligand H3cpdp with stoichiometric amounts of CuCl2·2H2O/Na2(CH2CH2COO)2 in methanol-water in the presence of NaOH at room temperature. The solid state structure of 1 consists of a [Cu4(µ4-adip)] core unit which is held together by two multidentate bridging ligands, cpdp3−. In fact, complex 1 can be viewed as a “dimer-of-dimers” generated by self-assembly of two [Cu2(cpdp)]+ units exclusively bridged by one adipate group in a μ4:η1:η1:η1:η1 fashion. Variable-temperature (2–300 K) magnetic susceptibility measurements disclose the presence of antiferromagnetic interactions among the copper(II) ions. Thermal behaviour of 1 has been investigated by thermogravimetric analysis specifying that the complex is stable up to ∼200 °C.

中文翻译：

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羧酸基多齿配体衍生的新型自组装四核铜(II)配合物的合成、结构和性质

摘要 一种新型四核铜(II)配合物，[Cu(H2O)5][Cu4(cpdp)2(adip)]ClBr∙2CH3OH·8H2O (1) 的羧酸盐对称多齿配体，H3cpdp [H3cpdp = N,N '-双[2-羧基苯甲甲基]-N,N'-双[2-吡啶甲基]-1,3-二氨基丙-2-醇；adip = 己二酸]，已被合成并充分表征。配合物 1 通过配体 H3cpdp 与化学计量的 CuCl2·2H2O/Na2(CH2CH2COO)2 在甲醇-水中在 NaOH 存在下在室温下反应合成。1 的固态结构由 [Cu4(μ4-adip)] 核心单元组成，该单元由两个多齿桥连配体 cpdp3- 保持在一起。事实上，复合物 1 可以被视为由两个 [Cu2(cpdp)]+ 单元以 μ4:η1:η1:η1:η1 方式专门桥接的两个 [Cu2(cpdp)]+ 单元自组装产生的“二聚体-二聚体” . 变温 (2–300 K) 磁化率测量揭示了铜 (II) 离子之间存在反铁磁相互作用。已通过热重分析研究了 1 的热行为，表明该配合物在高达 200 °C 时是稳定的。