Ru(2,2'-bipyrazine)(2,2'-bipyrimidine)2(1+) | 134042-32-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二嗪类
• 英文名称: Ru(2,2'-bipyrazine)(2,2'-bipyrimidine)2(1+)
• CAS: 134042-32-3
• 化学式: C₂₄H₁₈N₁₂Ru
• 分子量: 575.557
• InChiKey: UOCLZYNIUKFAHQ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 重原子数：
  None
• 可旋转键数：
  None
• 环数：
  None
• sp3杂化的碳原子比例：
  None
• 拓扑面积：
  None
• 氢给体数：
  None
• 氢受体数：
  None

反应信息

• 作为反应物：
  描述：

  Ru(2,2'-bipyrazine)(2,2'-bipyrimidine)2(1+) 在 methyl viologen⁽²⁺⁾ 作用下， 以 sodium hydroxide 为溶剂， 生成 2,2'-bipyrazine-bis(2,2'-bipyrimidine)ruthenium(II)(2+)
  参考文献：
  名称：

  钌（II）-二亚胺络合物的单电子还原：水溶液中含有2,2'-联吡啶，2,2'-联嘧啶和2,2'-联吡嗪的还原物种的表征

  摘要：

  The one-electron reductions of ten Ru(II)-diimine complexes of the general formula Ru(bpy)3-m-z(bpm)m(bpz)z2+ (bpy = 2,2'-bipyridine, bpm = 2,2'-bipyrimidine, bpz = 2,2'-bipyrazine, m and z = 0,1,2,3 and m + z less-than-or-equal-to 3), generically indicated as RuL2+, have been investigated in aqueous solution by the use of radiation chemical and electrochemical techniques, leading to the characterization of the one-electron reduced products (RuL.+) and their conjugate acids (RuLH.2+). Because the ease of reduction of the ligands follows the trend bpz > bpm > bpy, the electron added to RuL2+ is localized on the ligand that is most easily reduced. The E-degrees values for the RuL2+/RuL.+ couples range from -0.50 V to -1.22 V for Ru(bpz)3(2+) and Ru(bpy)3(2+), respectively. All the RuL.+ absorption spectra show intense bands (epsilon-max approximately 10(4) M-1 cm-1) in the 340- and 480-nm regions that arise from ligand-localized transitions within the uniquely reduced ligand, with the visible band also overlapped by a MLCT band; the absorption bands of RuLH.2+ are shifted somewhat to the blue. From the variation of the absorbance as a function of pH, the pK(a) values of RuLH.2+ are obtained; they range from 6.3 to 9.2 for Ru(bpm)2(bpmH.-)2+ to Ru(bpy)2(bpzH.-)2+, respectively, and correlate linearly with E-degrees (RuL2+/RuL.+), with separate lines for bpz and bpm acceptor ligands. From the values of pK(a) and E-degrees (RuL2+/RuL.+), E-degrees (RuL2+,H+/RuLH.2+) are obtained. The rate constants for the following electron-transfer reactions have been measured or calculated and have been correlated with the values of DELTA-G-degrees and other kinetic parameters by use of the Marcus theory: RuL2+ +.CO2- --> RuL.+ + CO2, RuL.+ + MV2+ --> RuL2+ + MV.+ and its reverse reaction, and RuLH.2+ + MV2+ --> RuL2+ + MV.+ + H+ and its reverse reaction. The relevance of the results to the use of the complexes as electron-transfer photosensitizers is discussed.

  DOI：

  10.1021/j100166a040
• 作为产物：
  描述：

  2,2'-bipyrazine-bis(2,2'-bipyrimidine)ruthenium(II)(2+) 在 CO₂^(1-) 作用下， 以 水 为溶剂， 生成 Ru(2,2'-bipyrazine)(2,2'-bipyrimidine)2(1+)
  参考文献：
  名称：

  钌（II）-二亚胺络合物的单电子还原：水溶液中含有2,2'-联吡啶，2,2'-联嘧啶和2,2'-联吡嗪的还原物种的表征

  摘要：

  The one-electron reductions of ten Ru(II)-diimine complexes of the general formula Ru(bpy)3-m-z(bpm)m(bpz)z2+ (bpy = 2,2'-bipyridine, bpm = 2,2'-bipyrimidine, bpz = 2,2'-bipyrazine, m and z = 0,1,2,3 and m + z less-than-or-equal-to 3), generically indicated as RuL2+, have been investigated in aqueous solution by the use of radiation chemical and electrochemical techniques, leading to the characterization of the one-electron reduced products (RuL.+) and their conjugate acids (RuLH.2+). Because the ease of reduction of the ligands follows the trend bpz > bpm > bpy, the electron added to RuL2+ is localized on the ligand that is most easily reduced. The E-degrees values for the RuL2+/RuL.+ couples range from -0.50 V to -1.22 V for Ru(bpz)3(2+) and Ru(bpy)3(2+), respectively. All the RuL.+ absorption spectra show intense bands (epsilon-max approximately 10(4) M-1 cm-1) in the 340- and 480-nm regions that arise from ligand-localized transitions within the uniquely reduced ligand, with the visible band also overlapped by a MLCT band; the absorption bands of RuLH.2+ are shifted somewhat to the blue. From the variation of the absorbance as a function of pH, the pK(a) values of RuLH.2+ are obtained; they range from 6.3 to 9.2 for Ru(bpm)2(bpmH.-)2+ to Ru(bpy)2(bpzH.-)2+, respectively, and correlate linearly with E-degrees (RuL2+/RuL.+), with separate lines for bpz and bpm acceptor ligands. From the values of pK(a) and E-degrees (RuL2+/RuL.+), E-degrees (RuL2+,H+/RuLH.2+) are obtained. The rate constants for the following electron-transfer reactions have been measured or calculated and have been correlated with the values of DELTA-G-degrees and other kinetic parameters by use of the Marcus theory: RuL2+ +.CO2- --> RuL.+ + CO2, RuL.+ + MV2+ --> RuL2+ + MV.+ and its reverse reaction, and RuLH.2+ + MV2+ --> RuL2+ + MV.+ + H+ and its reverse reaction. The relevance of the results to the use of the complexes as electron-transfer photosensitizers is discussed.

  DOI：

  10.1021/j100166a040