Characterization of Cu<sub>11</sub>(μ<sub>9</sub>-Se)(μ<sub>3</sub>-I)<sub>3</sub>[Se<sub>2</sub>P(OR)<sub>2</sub>]<sub>6</sub>(R = Pr, Pr<sup>i</sup>) by X-ray diffraction and multinuclear NMR
作者:Chen-Wei Liu、Chiu-Mine Hung、Ju-Chung Wang、Tai-Chiun Keng
DOI:10.1039/b202633n
日期:——
Two types of products were isolated from the reaction of NH4Se2P(OR)2 (R = Pr, Pri), Cu(CH3CN)4PF6, and Bu4NI in a 3 â¶ 2 â¶ 2 molar ratio in diethyl ether. The formulation of 1, Cu8(μ8-Se)[Se2P(OR)2]6, and 2, Cu11(μ9-Se)(μ3-I)3[Se2P(OR)2]6, was confirmed by elemental analyses, positive FAB mass spectrometry, multinuclear NMR (1H, 31P, and 77Se), and X-ray diffraction (1a and 2b). The geometry in 1 can be described as a selenide-centered, slightly distorted Cu8 cube with each edge of the cube being bridged by a selenium atom of the diselenophosphato (dsep) ligands . The sx dsep ligands, each capped on the square face of the cube, adopt a tetrametallic tetraconnective coordination pattern. The eleven copper atoms in 2 adopt the geometry of a 3,3,4,4,4-pentacapped trigonal prism with a selenium atom in the center. The coordination geometry for the central selenium atom is tricapped trigonal prismatic. In addition, the central core (Cu11Se in 2) is further stabilized by three iodides and six dsep ligands. A unique 77Se NMR pattern for the dsep ligands clearly indicates that local C3h symmetry was retained in solution. Moreover, the octacoordinated and nonacoordinated selenium atoms in 1 and 2 are unequivocally characterized by the 77Se NMR spectra, whose resonance frequencies are centered around â1150 and â1200 ppm, respectively.
在二
乙醚中,NH4Se2P(OR)2(R = Pr,Pri)、Cu(CH3CN)4PF6 和 Bu4NI 以 3 ∥ 2 ∥ 2 的摩尔比发生反应,分离出两种类型的产物。元素分析、正 FAB 质谱、多核核磁共振(1H、31P 和 77Se)和 X 射线衍射(1a 和 2b)证实了 1(Cu8(δ8-Se)[Se2P(OR)2]6)和 2(Cu11(δ9-Se)(δ3-I)3[Se2P(OR)2]6)的配方。1 的几何形状可以描述为一个以
硒为中心、略微扭曲的 Cu8 立方体,立方体的每个边缘都由二
硒磷配体(dsep)的一个
硒原子桥接。sx dsep
配体分别位于立方体的正方形面上,采用四
金属四连接配位模式。2 中的 11 个
铜原子采用了 3,
3,4,4,4 五角三棱柱的几何形状,中心有一个
硒原子。中心
硒原子的配位几何为三帽三棱锥。此外,三个
碘化物和六个 dsep
配体进一步稳定了中心核(2 中的 Cu11Se)。dsep
配体独特的 77Se NMR 模式清楚地表明,溶液中保留了局部 C3h 对称性。此外,1 和 2 中的八配位
硒原子和非配位
硒原子在 77Se NMR 光谱中具有明确的特征,其共振频率分别以±1150 和±1200 ppm 为中心。