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Synthesis, characterization and electrochemistry of rhodium(iii) complexes of meso-substituted [14]tribenzotriphyrin(2.1.1)

机译:中甲醛(III)复合物的合成,表征和电化学络合物[14]呋喃酚萘嘧啶(2.1.1)

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A thermal reaction using a series of [14]tribenzotriphyrins(2.1.1) (TriPs, 1a–d ) with Rh _(2) (C _(8) H _(12) )Cl _(2) provides Rh ~(III) –TriP complexes ( 2a–d ) in 40?52% yields. The complexes were characterized by mass spectrometry, UV-visible absorption and ~(1) H NMR spectroscopy. Single crystal X-ray analysis reveals that 2b adopts a dome-shaped conformation. The rhodium( III ) ion is coordinated by the three pyrrole nitrogen atoms, two chloride ions and the nitrogen atom of an acetonitrile (CH _(3) CN) solvent molecule. The optical spectra can be assigned using Michl's perimeter model. The L and B bands of the 2a–d complexes lie at ca. 600 and 500 nm, respectively, and are markedly red shifted relative to those of 1a–d . A reversible one-electron oxidation and two reversible one-electron reductions are observed in the cyclic voltammograms of 2a–d in CH _(2) Cl _(2) . The redox potentials are consistent with the optical data and the relatively narrow HOMO–LUMO gaps that are predicted in DFT calculations. TD-DFT calculations have been used to assign a third intense spectral band at 375 nm to a higher energy π → π* transition of the [14]tribenzotriphyrin(2.1.1) π-system.
机译:使用RH _(2)(C _(8)H _(12))CL _(2)提供RH〜(4)的热反应III) - 在40℃的菌株(2a-d)的菌株52%。该配合物的特征在于质谱,UV可见吸收和〜(1)H NMR光谱。单晶X射线分析显示,2B采用圆顶形构象。铑(III)离子由三个吡咯氮原子,两种氯离子和乙腈(CH _(3)CN)溶剂分子的氮原子配位。可以使用MICHL的周边模型分配光谱。 2A-D复合物的L和B带位于CA.分别为600和500nm,并且相对于1A-D的那些,显着的红色移位。在CH _(2)CL _(2)中的2A-D的循环伏安图中观察到可逆的单电子氧化和两个可逆的单电子减少。氧化还原电位与光学数据和在DFT计算中预测的相对窄的同性恋间隙一致。已经使用TD-DFT计算在375nm处将第三激光带分配给[14]二苯脲素(2.1.1)π-系统的较高能量π→π*转变。

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