Electronic Configuration Assignment and the Importance of Low-Lying Excited States in High-Spin Imidazole-Ligated Iron(II) Porphyrinates
作者:Chuanjiang Hu、Arne Roth、Mary K. Ellison、Jin An、Christina M. Ellis、Charles E. Schulz、W. Robert Scheidt
DOI:10.1021/ja044077p
日期:2005.4.1
ground-state electronic configuration for all high-spin imidazole-ligated iron(II) porphyrinates as (d(xz)())(2)(d(yz)())(1)(d(xy)())(1)(d(z)()()2)(1)(d(x)()()2(-)(y)()()2)(1). This is a distinctly different ground-state electronic configuration from other high-spiniron(II) porphyrinates; differences in structural details for the two classes of high-spincomplexes are also discussed. The apparent anomaly
描述了六种新型高自旋脱氧肌红蛋白模型(咪唑(四芳基卟啉)铁(II))的合成和表征。这些已经通过温度依赖性穆斯堡尔光谱从 295 到 4.2 K 进行了深入研究。所有配合物都显示出四极分裂的强烈温度依赖性,与相同或较低多重性的低位激发态一致。对施加磁场中获得的数据的分析导致了四极分裂的符号的分配。先前研究的所有模型化合物以及脱氧肌红蛋白和脱氧血红蛋白的四极分裂均具有负号。尽管之前没有预测到,但该实验观察导致将所有高自旋咪唑配位铁 (II) 卟啉盐的基态电子构型指定为 (d(xz)())(2)(d(yz)( ))(1)(d(xy)())(1)(d(z)()()2)(1)(d(x)()()2(-)(y)()() 2)(1)。这是与其他高自旋卟啉铁 (II) 盐明显不同的基态电子构型;还讨论了两类高自旋配合物结构细节的差异。解决了先前研究的模型复合物和血红素蛋白之间零场分裂常数的不同符号的明显异常
Four-Coordinate Iron(II) Porphyrinates: Electronic Configuration Change by Intermolecular Interaction
作者:Chuanjiang Hu、Bruce C. Noll、Charles E. Schulz、W. Robert Scheidt
DOI:10.1021/ic0620182
日期:2007.2.1
1975, 97, 2676). This new phase of Fe(TPP) has a very saddled porphyrin core; the prior phase was ruffled. The iron atom has close interactions (approximately 3.10 A) with two pyrrole Cb-Cb bonds above and below the porphyrin plane. Mossbauer spectra and magnetic susceptibility measurements, different for the two phases, provide strong evidence that the two phases of Fe(TPP) have distinct electronic structures
Electronic Configuration of Five-Coordinate High-Spin Pyrazole-Ligated Iron(II) Porphyrinates
作者:Chuanjiang Hu、Bruce C. Noll、Charles E. Schulz、W. Robert Scheidt
DOI:10.1021/ic101469e
日期:2010.12.6
used as a fifth ligand to prepare two new species, [Fe(TPP)(Hdmpz)] and [Fe(Tp-OCH3PP)(Hdmpz)] (Hdmpz = 3,5-dimethylpyrazole), the first structurally characterized examples of five-coordinate iron(II) porphyrinates with a nonimidazole neutral ligand. Both complexes are characterized by X-ray crystallography, and structures show common features for five-coordinate iron(II) species, such as an expanded
吡唑是一种中性氮配体和咪唑的异构体,已被用作第五配体来制备两种新物种 [Fe(TPP)(Hdmpz)] 和 [Fe(T p -OCH 3 PP)(Hdmpz)] ( Hdmpz = 3,5-二甲基吡唑),这是第一个具有非咪唑中性配体的五配位铁 (II) 卟啉酸盐的结构特征实例。两种配合物均通过 X 射线晶体学表征,并且结构显示出五配位铁 (II) 物种的共同特征,例如扩展的卟啉核、大的赤道 Fe-N p键距和显着的平面外位移铁(II)原子。Fe-N(吡唑)和 Fe-N p键距与咪唑连接物种中的键距相似。这些表明咪唑和吡唑与铁 (II) 的配位能力非常相似,即使吡唑的碱性低于咪唑。Mössbauer 研究表明 [Fe(TPP)(Hdmpz)] 具有与咪唑连接物种相同的行为,例如负四极分裂值和相对较大的不对称参数。结构和穆斯堡尔谱均表明吡唑连接的五配位铁 (II) 卟啉酸盐具有与咪唑连接的物种相同的电子构型。
A facile and versatile preparation of bilindiones and biladienones from tetraarylporphyrins
Bilindiones and biladienones carrying aryl groups at the meso positions were prepared using coupled oxidation reactions of iron tetraarylporphyrins in 20–63% yield.
Synthetic strategies towards functionalized<i>N</i>-bridged μ-nitrido diiron porphyrin complexes
作者:Olcay Eren、Fabienne Dumoulin、Ümit İşci
DOI:10.1142/s1088424623500268
日期:2023.1
porphyrinoid complexes that can be incorporated into advanced functionalizedmaterials and thereby increase the range of their utilization, we have explored syntheticstrategies to prepare di- and octafunctionalised N-bridged diiron porphyrin complexes, either with hydroxyl or propargyl functions, which have been selected for their versatility. The considerations taken into account for the synthetic strategies