AbstractThe synthesis and characterization of the first two Re complexes with semicarbazone ligands is presented. Selected ligands are 5‐Nitro‐2‐furaldehyde semicarbazone (Nitrofurazone) (L1) and its derivative 3‐(5‐Nitrofuryl)acroleine semicarbazone (L2). Complexes of general formula [ReVOCl2(PPh3)L], where L = L1 and L2, were prepared in good yields and high purity by reaction of [ReVOCl3(PPh3)2] with L in ethanol or methanol solutions. The complexes formula and molecular structures were supported by elemental analyses and electronic, FTIR, 1H, 13C and 31P NMR spectroscopies. In addition, the crystal and molecular structure of [ReVOCl2(PPh3)L2] was determined by X‐ray diffraction methods. [ReOCl2(PPh3)(3‐(5‐Nitrofuryl)acroleine semicarbazone)] crystallizes in the space group P‐1 with a = 11.2334(2), b = 11.3040(2), c = 12.5040(2) Å, α = 81.861(1), β = 63.555(1), γ = 83.626(1)°, and Z = 2. The Re(V) ion is in a distorted octahedral environment, equatorially coordinated to a deprotonated semicarbazone molecule acting as a bidentate ligand through its carbonylic oxygen and azomethynic nitrogen atoms, to an oxo ligand and a chlorine atom. The six‐fold coordination is completed by another chlorine atom and a triphenylphosphine ligand at the axial positions.
摘要 介绍了首批两个带有半咔唑酮配体的 Re 复合物的合成和表征。所选配体为 5-硝基-2-呋喃甲醛半咔唑酮(硝基呋喃酮)(L1)及其衍生物 3-(5-硝基呋喃基)丙烯醛半咔唑酮(L2)。通过[ReVOCl3(PPh3)2]与 L 在乙醇或甲醇溶液中的反应,制备了通式为[ReVOCl2(PPh3)L](其中 L = L1 和 L2)的络合物,收率高且纯度高。元素分析以及电子、傅立叶变换红外、1H、13C 和 31P NMR 光谱证明了这些配合物的分子式和分子结构。此外,还通过 X 射线衍射方法确定了 [ReVOCl2(PPh3)L2] 的晶体和分子结构。[ReOCl2(PPh3)(3-(5-Nitrofuryl)acroleine semicarbazone)]在 P-1 空间群中结晶,a = 11.2334(2),b = 11.3040(2),c = 12.5040(2)埃,α = 81.861(1),β = 63.555(1),γ = 83.626(1)°,Z = 2。Re(V) 离子处于畸变的八面体环境中,通过其羰基氧原子和偶氮甲基氮原子,与作为双齿配体的去质子化半咔唑酮分子、一个氧配体和一个氯原子配位。轴向位置的另一个氯原子和一个三苯基膦配体完成了六重配位。