Combining oximes with azides to create a novel 1-D [NaCo<sup>III</sup><sub>2</sub>] system: synthesis, structure and solid-state NMR
作者:Thushan Pathmalingam、Fatemah Habib、Cory M. Widdifield、Francis Loiseau、Tara J. Burchell、Serge I. Gorelsky、André M. Beauchemin、David L. Bryce、Muralee Murugesu
DOI:10.1039/b918082f
日期:——
The synthesis and structure of a novel complex with the formula [NaCoIII2(dmo)2(μ-N3)3(N3)2]∞, 1, are reported. Complex 1 was synthesized from the reaction of 1-(dimethylamino)propan-2-one oxime (Hdmo), CoCl2·6H2O, and NaN3 in MeOH. It crystallizes in the monoclinic space group C2/c. The molecular structure consists of one NaI and two CoIII ions bridged by two oxime ligands, two end-to-end azide and three end-on azide anions. The units are linked, forming a 1-D chain. This complex was characterized by UV-Vis spectroscopy where the data confirm the presence of low-spin CoIII ions. Solid-state 23Na NMR experiments indicate the presence of one magnetically unique site in the repeating unit, that sample purity in the bulk powdered form is high, and that it possesses microcrystalline order. Solid-state 59Co NMR experiments at ultra-high field (B0 = 21.1 T) are in agreement with the structure obtained through X-ray crystallography where the CoIII ions are coordinated to five nitrogen atoms as well as an oxygen atom.
报告了一种新型络合物 1 的合成和结构,其化学式为[NaCoIII2(dmo)2(μ-N3)3(N3)2]∞。络合物 1 是由 1-(二甲基氨基)丙-2-酮肟(Hdmo)、CoCl2-6H2O 和 NaN3 在 MeOH 中反应合成的。它在单斜空间群 C2/c 中结晶。其分子结构由一个 NaI 离子和两个 CoIII 离子组成,并由两个肟配体、两个端对端叠氮阴离子和三个端对端叠氮阴离子桥接。这些单元相互连接,形成一个一维链。该复合物的特征通过紫外-可见光谱分析得出,数据证实了低自旋 CoIII 离子的存在。固态 23Na NMR 实验表明,重复单元中存在一个磁性独特的位点,粉末状样品纯度很高,并具有微晶阶序。在超高磁场(B0 = 21.1 T)下进行的固态 59Co NMR 实验与通过 X 射线晶体学获得的结构一致,其中 CoIII 离子与五个氮原子和一个氧原子配位。