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在水热条件下,利用2,5-二甲基苯-1,4-二亚甲基二膦酸(H4L)与CoCl2·6H2O或NiSO4·6H2O反应得到2个同构的过渡金属有机膦酸化合物,[Co(H2O)4(H2L)]n(1),[Ni(H2O)4(H2L)]n(2),并用元素分析、红外光谱、粉末及单晶X-射线等方法对其进行了表征。晶体结构分析表明:化合物1和2都属于三斜晶系,空间群为P1,化合物1的晶胞参数为a=0.497 0(2)nm,b=0.711 3(3)nm,c=1.177 8(5)nm,α=97.779(7)°,β=92.103(7)°,γ=107.217(6)°,V=0.3927(3)nm3,Z=2;化合物2的晶胞参数为a=0.494 35(19)nm,b=0.708 9(3)nm,c=1.172 6(5)nm,α=97.919(6)°,β=92.130(6)°,γ=107.441(5)°,V=0.387 0(3)nm3,Z=2。金属离子采取了八面体构型,6个配位氧原子分别来自2个反式构型的H2L配体和4个配位水分子。每1个金属离子与2个反式构型的H2L配体配位形成了一维线型链状结构。这2个化合物最终通过O-H…O氢键作用形成了三维结构。此外,对2个化合物的热稳定性也进行了研究。
Under hydrothermal conditions, 2,5-dimethylbenzene-1,4-dimethylene diphosphonic acid (H4L) was reacted with CoCl2 · 6H2O or NiSO4 · 6H2O to obtain two isomeric transition metal organic phosphonic acids [Co (H2O) 4 (H2L)] n (1), Ni (H2O) 4 (H2L)] n (2) were synthesized and characterized by elemental analysis, IR, powder and single crystal X- Characterized. Crystal structure analysis shows that compounds 1 and 2 belong to the triclinic system with space group P1. The unit cell parameters of compound 1 are a = 0.497 0 (2) nm, b = 0.711 3 (3) nm, c = 1.177 8 (5) nm, α = 97.779 (7) °, β = 92.103 (7) °, γ = 107.217 (6) ° and V = 0.3927 (3) nm3 and Z = 0.494 35 19 nm, b = 0.708 9 3 nm, c = 1.172 6 5 nm, α = 97.919 6 °, β = 92.130 6 °, γ = 107.441 5 °, V = 0.387 0 (3) nm3, Z = 2. The metal ions adopt the octahedral configuration. The six coordination oxygen atoms come from two trans configuration H2L ligands and four coordination water molecules, respectively. One metal ion coordinated with two trans-H2L ligands to form a one-dimensional linear chain. These two compounds finally formed a three-dimensional structure by O-H ... O hydrogen bonding. In addition, the thermal stability of the two compounds was also investigated.