[Os(CN)5(pyrazine)](3-) | 182081-67-0

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: [Os(CN)5(pyrazine)](3-)
• 英文别名: Os(CN)5(pyrazine)(3-)；[pentacyano(pyrazine)osmate(II)](3-)
• CAS: 182081-67-0
• 化学式: C₉H₄N₇Os
• 分子量: 400.378
• InChiKey: MTUKVLGXQWVNIK-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

• 作为产物：
  描述：

  吡嗪 、 [pentacyano-H2O-osmate(II)](3-) 在 sodium chloride 作用下， 以 水 为溶剂， 生成 [Os(CN)5(pyrazine)](3-)
  参考文献：
  名称：

  pentacyano-L-osmate（II）配合物（L = H（2）O，NH（3），N-杂环配体）中配体互换的动力学和机理。

  摘要：

  制备了新的配合物K（3）[Os（CN）（5）NH（3）]。2H（2）O，该化合物是戊酰基-L-osmate（II）系列的便捷前体，并通过化学分析进行了表征，循环伏安法以及红外和紫外可见光谱。通过在弱酸性介质中控制水合，生成了[Os（CN）（5）H（2）O]（3-）离子。L = H（2）O，NH（3）和CN（-）在UV区的弱吸收分别在287、272和240 nm处发现，并根据模型分配给dd跃迁四方畸变离子也适用于铁和钌系列的成员。[Os（CN）（5）L]（n-）离子的形成和离解反应的动力学，L =吡啶（py），吡嗪（pz），N-甲基吡嗪鎓（mpz（+））等。 ，进行了研究。在25.0摄氏度下，中性配体pz和异烟酰胺的形成速率常数约为。0。13 M（-1）s（-1），对于L = mpz（+）略有增加，对于异烟酸酯减少。活化焓为约。大约22.0 kcal mol（-1），与进入的L无关，并且激活熵均为正。11-13

  DOI：

  10.1021/ic010923a

文献信息

• Spectroelectrochemical Characterization of the Two-Step Redox System {(μ-pz)[Os(CN)₅]₂}<i>ⁿ</i>^- (<i>n</i> = 4, 5, 6; pz = Pyrazine). Similarities and Differences in Relation to the Creutz−Taube System
  作者：Fridmann M. Hornung、Frank Baumann、Wolfgang Kaim、José A. Olabe、Leonardo D. Slep、Jan Fiedler

  DOI：10.1021/ic970804o

  日期：1998.1.1

  The pyrazine-bridged diosmium(II) complex (mu-C4H4N2)[OS(CN)(5)](2)}(6-) has been synthesized as the hexapotassium salt and was converted to the hexakis(tetrabutylammonium) compound by ion exchange. Its stepwise oxidation to the (Os2OsII)-Os-III and (Os2OsIII)-Os-III states was monitored spectroelectrochemically in acetonitrile/0.1 M Bu4NPF6 in the UV-vis-NIR and IR regions and by EPR. The Os-2(II), species exhibits long-wavelength solvatochromic MLCT bands at 14 800 and 18 480 cm(-1). The pentaanionic mixed-valent ion has a comproportionation constant K-c of 10(5.8) and is distinguished by several electronic absorptions in the IR region. The bands at 1972, 2480, 4000, 5000, 7170, and 11 900 cm(-1) are similar but appreciably lower in energy than those reported for the analogous complex (mu-C4H4N2)[Os(NH3)(5)](2)}(5+). In addition to CN vibrational stretching features shifted on electron transfer there is an additional sharp band only for the 5- ion at 1582 cm(-1) which is attributed to a pyrazine ring vibration. The intensity of this band suggests an unsymmetrical situation and thus valence localization on the vibrational time scale. The EPR signals at g(perpendicular to) = 2.0563 and g(parallel to) = 1.761 point toward excited states lying close to the doublet ground state and to significant metal/cyanide interaction. Compared to the Creutz-Taube ion (mu-C4H4N2)[Ru(NH3)(5)](2)}(5+) and its osmium homologue, the 5-ion described here exhibits a lower degree of metal-metal coupling.