稀土冠醚配合物的研究XXI. 单羟基冠醚与钙、稀土元素间的竞争配位及其钙配位化合物的晶体结构

研究了单羟基冠醚配位体6-羟基-2, 3, 9, 10-二苯并-1, 4, 8,11, 14-五氧杂环十六-2, 9-二烯(L)对钙和镧系元素的竞争配位反应, 发现该配位体在我们的实验条件下对钙的配位能力要明显大于对重稀土的配位能力; 同时研究了标题大环配位体和钙的配位化合物的晶体结构, 该配位化合物的分子结构式为[Ca(NO3)(H2O)L](NO3),Mr=528.47, 晶体属单斜晶系, α=1.5285(6), b=0.9713(3),c=1.5134(7)nm, β=98.79(3)ⅲ, V=2.2205nm^3, Dex=1.521g/cm^3,Dc=1.527g/cm^3, Z=4, 空间群为P21/c。

Studies on rare earth coordination compounds with crown ether XXI. competitive coordination reaction of monohydroxyl crown ether with Ca^2^+ and Ln^3^+ ions and the crystal structure of its coordination compound with Ca^2^+

Under the same reaction conditions, the coordination of monohydroxyl crown ether 6-hydroxy-2, 3, 9, 10-dibenzo-1, 4, 8, 11, 14-pentaoxa-cyclohexadeca-2, 9-diene with Ca^2^+ is stronger than that of Y^3^+. The results of crystal structure of the title complex are as follows: monoclinic, space group P21/c, with α=1.5285(6), b=0.9713(3), c=1.5134(7)nm, β=98.79(3)ⅲ, V=2.2205nm^3, Dex=1.521g/cm^3, Dc=1.527g/cm^3, Z=4. In the complex, eight oxygen atoms (five from crown ether ring, one from -OH, one from a water molecule and one from a monodentate nitrate anion) coordinate to Ca(II) forming an eight coordinated structural unit.