Synthesis, crystal structures, and magnetic properties of cobalt(II) and nickel(II) complexes of 2,2′-bipyridine-6,6′-dicarboxylate: three three-dimensional networks formed via hydrogen bonding interactions
Synthesis, crystal structures, and magnetic properties of cobalt(II) and nickel(II) complexes of 2,2′-bipyridine-6,6′-dicarboxylate: three three-dimensional networks formed via hydrogen bonding interactions
复制标题
DOI：
10.1007/s11243-010-9433-3
复制
发表时间：
2011-02
影响因子：
1.7
通讯作者：
Jinzhong Gu;Dong-Yu Lv;Zhu-Qing Gao;Jian-Zhao Liu;W. Dou
中科院分区：
文献类型：
--
作者：
Jinzhong Gu;Dong-Yu Lv;Zhu-Qing Gao;Jian-Zhao Liu;W. Dou
三种 Co(II) 和 Ni(II) 配合物，即 [Co(bpdc)(H2O)2] (1)、[Ni(bpdc)(H2O)2] (2) 和 [Co2(bpdc)2(prz)0.5(H2O)3]·0.5H2O (3) (H2bpdc = 2,2′-联吡啶-6,6′-二羧酸 酸和 prz = 哌嗪），是在水热条件下由 H2bpdc 和相应的金属盐合成的。通过物理化学和光谱方法以及 X 射线晶体学对配合物进行了表征。化合物 1 和 2 均由中性单核分子组成，分别为 [Co(bpdc)(H2O)2] 和 [Ni(bpdc)(H2O)2]。化合物3由单核分子[Co(bpdc)(H2O)2]和双核分子[Co2(bpdc)2prz(H2O)2]组成。离散的中性配合物1-3通过分子间O-H⋯O和C-H⋯O氢键以及π-π堆积相互作用将其结构进一步扩展为三维超分子结构。磁化率测量表明，complex3 在由 prz 配体桥接的两个 Co(II) 离子之间表现出弱铁磁相互作用，其中 C = 5.41 cm3mol−1K 和 θ = +27.6 K。
Three Co(II) and Ni(II) complexes, namely [Co(bpdc)(H2O)2] (1), [Ni(bpdc)(H2O)2] (2), and [Co2(bpdc)2(prz)0.5(H2O)3]·0.5H2O (3) (H2bpdc = 2,2′-bipyridine-6,6′-dicarboxylic acid and prz = piperazine), have been synthesized from H2bpdc and the corresponding metal salts under hydrothermal conditions. The complexes were characterized by physico-chemical and spectroscopic methods, as well as by X-ray crystallography. Compounds1and2both consist of neutral mononuclear molecules, of [Co(bpdc)(H2O)2] and [Ni(bpdc)(H2O)2], respectively. Compound3consists of a mononuclear molecule of [Co(bpdc)(H2O)2] and a binuclear molecule of [Co2(bpdc)2prz (H2O)2]. The discrete neutral complexes1–3further extend their structures into three-dimensional supramolecular architectures by intermolecular O–H⋯O and C–H⋯O hydrogen bonds as well as π–π stacking interactions. Magnetic susceptibility measurements show that complex3exhibits weak ferromagnetic interactions between the two Co(II) ions bridged by the prz ligand, with C = 5.41 cm3mol−1K and θ = +27.6 K, respectively.