混合配体配合物[Co_(3)(BTC)_(2)(L_(b))_(2)(CH_(3)CH_(2)OH)_(2)·4H_(2)O]_(n)的合成与晶体结构

Synthesis and Crystal Structure of Mixed-Ligand Coordination Polymer[Co_(3)(BTC)_(2)(L_(b))_(2)(CH_(3)CH_(2)OH)_(2)·4H_(2)O]_(n)

以1,3,5-均苯三甲酸(H_(3)BTC)、2-[1-(2-吡嗪基)乙缩醛腙(L_(a))、醋酸钴、为原料采用水热法合成了配合物[Co_(3)(BTC)_(2)(L_(b))_(2)(CH_(3)CH_(2)OH)_(2)·4H_(2)O]_(n)1(L_(b)=2-乙酰基吡嗪缩水合肼)。配合物晶体属单斜晶系,空间群C2/c。X-射线单晶衍射结果表明:两个Co^(2+)离子与氧原子、氮原子配位,均为变形八面体构型。席夫碱配体在配位过程中分解为2-乙酰基吡嗪缩水合肼,BTC^(3-)配体全部去质子化且以μ_(4)-的配位模式将两个Co^(2+)连接成6-连接的三维结构。晶胞参数:a=15.146(9),b=13.417(8),c=23.564(18),β=90.087(8)°,V=4789(5)A^(3),Z=4。

Under hydrothermal conditions,the coordination complex,[Co_(3)(BTC)_(2)(L_(b))_(2)(CH_(3)CH_(2)OH)_(2)·4H_(2)O]_(n)(L_(b)=2-Ethanehydrazonoylpyrazine),was synthesized by using 1,3,5-benzene tricarboxylic acid(H_(3)BTC),2-[1-(2-pyrazinyl)ethylidene]hydrazone(L_(a))and Co(CH_(3)COO)_(2)·4H_(2)O as raw materials.Crystal data for 1 was as follows:monoclinic,space group C2/c,a=15.146(9)A,6=13.417(8)A,c=23.564(18)A,0=90.087(8)0,7=4789(5)A^(3),Z=4.Single crystal X-ray diffraction revealed that that the two Co(Ⅱ)ions coordinated with oxygen and nitrogen atoms,displaying a distorted octahedral configuration.The Schiff base ligand decomposed into 2-ethanehydrazonoylpyrazine.The BTC^(3-)ligand was fully deprotonated and bridges the Co^(2+)ions in μ_(4)-coordination mode,forming a 6-connected 3D framework.