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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Cyclometallated Pt(II) and Pd(II) complexes with a trithiacrown ligand
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Cyclometallated Pt(II) and Pd(II) complexes with a trithiacrown ligand

机译:具有三硫杂cro配体的环金属化的Pt(II)和Pd(II)配合物

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We report the synthesis and full characterization for a series of cyclometallated complexes of Pt(II) and Pd(II) incorporating the fluxional trithiacrown ligand 1,4,7-trithiacyclononane ([9]aneS(3)). Reaction of [M(C boolean AND N)(mu-Cl)](2) (M = Pt(II), Pd(II); C boolean AND N = 2-phenylpyridinate (ppy) or 7,8-benzoquinolinate (bzq)) with [9]aneS(3) followed by metathesis with NH4PF6 yields [M(C boolean AND N)([9]aneS(3))](PF6). The complexes [M(C boolean AND P)([9]aneS(3))](PF6) (M= Pt(II), Pd(II); C boolean AND P = {CH2C6H4P(o-tolyl)(2)-C boolean AND P}(-)) were synthesized from their respective [Pt(C boolean AND P)(mu-Cl)](2) or [Pd(C boolean AND P)(mu-O2CCH3)](2) (C boolean AND P) starting materials. All five new complexes have been fully characterized by multinuclear NMR, IR and UV-Vis spectroscopies in addition to elemental analysis, cyclic voltammetry, and single-crystal structural determinations. As expected, the coordinated [9]aneS(3) ligand shows fluxional behavior in its NMR spectra, resulting in a single C-13 NMR resonance despite the asymmetric coordination environment of the cyclometallating ligand. Electrochemical studies reveal irreversible one-electron metal-centered oxidations for all Pt( II) complexes, but unusual two-electron reversible oxidations for the Pd( II) complexes of ppy and bzq. The X-ray crystal structures of each complex indicate an axial M - S interaction formed by the endodentate conformation of the [9]aneS(3) ligand. The structure of [ Pd( bzq)([9]aneS(3))](PF6) exhibits disorder in the [9]aneS(3) conformation indicating a rare exodentate conformation as the major contributor in the solid-state structure. DFT calculations on [Pt([9]aneS(3))(ppy)](PF6) and [Pd([9]aneS(3))(ppy)](PF6) indicate the HOMO for both complexes is primarily d(z2) in character with a significant contribution from the phenyl ring of the ppy ligand and p orbital of the axial sulfur donor. In contrast, the calculated LUMO is primarily ppy pi(*) in character for [Pt([9]aneS(3))(ppy)](PF6), but d(x2-y2) in character for [Pd([9]aneS(3))(ppy)](PF6).
机译:我们报告了合成和全面表征一系列的Pt(II)和Pd(II)的环金属化配合物,并结合了通量的三硫皇冠配体1,4,7-三硫环壬烷([9] aneS(3))。 [M(C布尔AND N)(mu-Cl)](2)的反应(M = Pt(II),Pd(II); C布尔AND N = 2-苯基吡啶酸酯(ppy)或7,8-苯并喹啉酸酯( bzq))与[9] aneS(3),然后与NH4PF6复分解得到[M(C布尔AND N)([9] aneS(3))](PF6)。络合物[M(C布尔AND P)([9] aneS(3))](PF6)(M = Pt(II),Pd(II); C布尔AND P = {CH2C6H4P(o-tolyl)(2 )-C布尔AND P}(-))由它们各自的[Pt(C布尔AND P)(mu-Cl)](2)或[Pd(C布尔AND P)(mu-O2CCH3)](2 )(C布尔AND P)起始材料。除元素分析,循环伏安法和单晶结构测定外,所有五种新配合物还通过多核NMR,IR和UV-Vis光谱进行了全面表征。正如预期的那样,尽管环金属化配体的配位环境不对称,但配位的[9] aneS(3)配体在其NMR光谱中显示出通量行为,导致单个C-13 NMR共振。电化学研究表明,所有Pt(II)配合物的不可逆的单电子金属中心氧化,但是ppy和bzq的Pd(II)配合物的不寻常的两电子可逆氧化。每个复合物的X射线晶体结构表明由[9] aneS(3)配体的齿状构象形成的轴向M-S相互作用。 [Pd(bzq)([9] aneS(3))](PF6)的结构在[9] aneS(3)构象中表现出无序,表明稀有的齿状构象是固态结构的主要贡献者。对[Pt([9] aneS(3))(ppy)](PF6)和[Pd([9] aneS(3))(ppy)](PF6)的DFT计算表明,两种络合物的HOMO主要为d( z2)的特征是ppy配体的苯环和轴向硫供体的p轨道具有重要作用。相比之下,对于[Pt([9] aneS(3))(ppy)](PF6),计算得出的LUMO主要是ppy pi(*),但是对于[Pd([9]],计算得出的LUMO则为d(x2-y2)。 ] aneS(3))(ppy)](PF6)。

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