Sc(III), Eu(III), and Gd(III) Complexes with Macrocyclic Cavitand Cucurbit[6]uril: Synthesis and Crystal Structures

Sc(III), Eu(III), and Gd(III) Complexes with Macrocyclic Cavitand Cucurbit[6]uril: Synthesis and Crystal Structures
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DOI:
10.1007/s11173-005-0167-2
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发表时间:
2005-11
影响因子:
1.9
通讯作者:
A. A. Tripol’skaya-A.;E. A. Mainicheva;T. V. Mit’kina;O. A. Geras’ko;D. Naumov;V. Fedin
A. A. Tripol’skaya-A.;E. A. Mainicheva;T. V. Mit’kina;O. A. Geras’ko;D. Naumov;V. Fedin
中科院分区:
化学4区
文献类型:
--
作者:
A. A. Tripol’skaya-A.;E. A. Mainicheva;T. V. Mit’kina;O. A. Geras’ko;D. Naumov;V. Fedin

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硝酸钪和硝酸铕与大环空穴和葫芦[6]脲的溶液缓慢蒸发得到同构配合物[Sc(NO3)(H2O)4(C36H36N24O12)](NO3)2·8.5H2O(空间群Pna 21,a= 32.0065(18)nm,B= 14.7904(8)nm,c= 11.5774(6)nm,V= 5480.6(5)nm,Z= 4)和[Eu(NO3)(H2O)4 [(C_(36)H_(36)N_(24)O_(12))](NO_3)_2·6.75H_2O(空间群Pna_(21),a= 31.9525(17)N,B= 14.7203(8)N,c= 11.8592(6)N,V= 5578.0(5)N,Z= 4)。这些配合物中的金属与配体的比例为1:1;在溶液中金属的浓度为0.025-0.1 mol/l时获得配合物。随着镧系元素浓度的增加(0.7-1 mol/l),2:1与葫芦[6]脲形成的配合物的组成为[{ Gd(NO3)(H2O)5}2(C36H36N24O12)](NO3)4·6.5H2O(空间群:a= 13.3972(6)<$,B= 14.4994(5)<$,c= 18.3290(8)<$,α = 73.5610(10)°,β = 87.2590(10)°,γ = 87.5540(10)°,V= 3409.4(2)<$3,Z= 2)和同型配合物[{Gd(NO3)(H2O)5}2{(C5 H5 N)(C36 H36 N24 O 12)}](NO3)4·8H 2 O与葫芦[6]脲空腔内的吡啶分子(空间群P21/n,a= 14.8263(6)<$,B= 13.3688(7)<$,c= 18.5970(9)<$,β = 107.5860(10)°,V= 3513.8(3)<$3,Z= 2)。X-射线衍射分析表明,配合物中的金属原子与瓜环[6]分子中的氧原子配位。
Slow evaporation of solutions of Sc and Eu nitrates with macrocyclic cavitand cucurbit[6]uril gives crystals of isostructural complexes [Sc(NO3)(H2O)4(C36H36N24O12)](NO3)2⋅ 8.5H2O (space groupPna21,a= 32.0065(18) Å,b= 14.7904(8) Å,c= 11.5774(6) Å,V= 5480.6(5) Å3,Z= 4) and [Eu(NO3)(H2O)4(C36H36N24O12)](NO3)2⋅ 6.75H2O (space groupPna21,a= 31.9525(17) Å,b= 14.7203(8) Å,c= 11.8592(6) Å,V= 5578.0(5) Å3,Z= 4). The metal to ligand ratio in these complexes is 1 : 1; the complexes are obtained at 0.025–0.1 mol/l concentrations of the metals in solutions. With higher lanthanide concentrations (0.7–1 mol/l), the 2 : 1 complex with cucurbit[6]uril is formed of the composition [{ Gd(NO3)(H2O)5}2(C36H36N24O12)](NO3)4⋅ 6.5H2O (space group,a= 13.3972(6) Å,b= 14.4994(5) Å,c= 18.3290(8) Å, α = 73.5610(10)°, β = 87.2590(10)°, γ = 87.5540(10)°,V= 3409.4(2) Å3,Z= 2) and isotypical complex [{Gd(NO3)(H2O)5}2{(C5H5N) ⊂ (C36H36N24O12)}](NO3)4⋅ 8H2O with a pyridine molecule inside the cucurbit[6]uril cavity (space groupP21/n,a= 14.8263(6) Å,b= 13.3688(7) Å,c= 18.5970(9) Å, β = 107.5860(10)°,V= 3513.8(3) Å3,Z= 2). According to X-ray diffraction data, the metal atoms of the title complexes coordinate the O atoms in portals of cucurbit[6]uril molecules.