Spin-glass behavior of a hierarchically-organized, hybrid microporous material, based on an extended framework of octanuclear iron-oxo units
作者:Xin-Yi Cao、Jeremiah W. Hubbard、Jennifer Guerrero-Medina、Arturo J. Hernández-Maldonado、Logesh Mathivathanan、Carlos Rinaldi、Yiannis Sanakis、Raphael G. Raptis
DOI:10.1039/c4dt02606c
日期:——
1 and 2. We employ the concept of continuous random network (CRN) to describe for the first time the framework features of a Fe8-based amorphousmaterials, in which the average connecting numbers of each Fe8-cluster are ∼3.7 and ∼3.6 for 1 and 2, respectively. 57Fe-Mössbauer spectroscopic analysis provides insights to the intercluster connectivity of 1 and 2 on one hand and to their magnetic properties
Spontaneous Resolution by Crystallization of an Octanuclear Iron(III) Complex Using Only Racemic Reagents
作者:Konstantinos A. Lazarou、Karilys González‐Nieves、Indranil Chakraborty、Raphael G. Raptis
DOI:10.1002/anie.201901877
日期:2019.5.27
The P and M enantiomers of the octanuclear [Fe8(μ4‐O)4(μ‐4‐Cl‐pz)12Cl4] complex, having T symmetry, were resolved by temporary substitution of chloride ligands by racemic 4‐sBu‐phenolates and subsequent crystallization, where the (S)‐ and (R)‐phenolates coordinate selectively to the M and P complexes, respectively. The complexes were characterized by circular dichroism analysis and X‐ray structure
Synthesis, Characterization, and Study of Octanuclear Iron-Oxo Clusters Containing a Redox-Active Fe<sub>4</sub>O<sub>4</sub>-Cubane Core
作者:Peter Baran、Roman Boča、Indranil Chakraborty、John Giapintzakis、Radovan Herchel、Qing Huang、John E. McGrady、Raphael G. Raptis、Yiannis Sanakis、Athanasios Simopoulos
DOI:10.1021/ic7020337
日期:2008.1.1
by density functional theory calculations, reveal weak antiferromagnetic coupling among the four cubane Fe centers and strong antiferromagnetic coupling between cubane and outer Fe atoms of 1. The structural similarity between the antiferromagnetic Fe(8)(micro(4-)O)(4) core of 1-4 and the antiferromagnetic units contained in the minerals ferrihydrite and maghemite is demonstrated by X-ray and Mossbauer
Mechanistic and Energetic Aspects of the Thermal and Photochemical Redox Chemistry of the Octanuclear Cubane Complexes, Fe<sup>III</sup><sub>8</sub>(μ<sup>4</sup>-O<sub>4</sub>)(μ-pyrazolate)<sub>12</sub>X<sub>4</sub>(X = Cl or Br)
作者:Guillermo Ferraudi、Dalice Piñero、Indranil Chakraborty、Raphael G. Raptis、A. Graham Lappin、Nicholas Berlin
DOI:10.1021/jp911644e
日期:2010.5.13
pyrazolate anion, X = Cl or Br) were investigated in this work. Reactions of the complexes with e−sol, C•H2OH, and several powerful reducing transition metalcomplexes were investigated using the pulse radiolysis technique. Reaction rates of the outer-sphere electron transfer reactions with transition metalcomplexes had to be rationalized by invoking the formation of a [FeIII7FeII ′(μ4-O4)(μ-Pz)12X4]−
簇的热和光化学氧化还原反应的机理的[Fe III 8(μ 4 -O 4)(μ-PZ)12 X 4 ](PZ =吡阴离子,X = Cl或Br)在这项工作中进行了研究。使用脉冲辐射分解技术研究了配合物与e - sol,C • H 2 OH和几种有效的还原性过渡金属配合物的反应。用过渡金属配合物所述外球体的电子转移反应的反应速率必须通过调用[Fe的形成合理化III 7的Fe II '(μ 4 -O 4)(μ-Pz)12 X 4 ] -中间或激发态。一种过渡形式,在e的反应观察到的-溶胶与立方烷可以是激发态或反应中间体介导的形成稳定的产品的,的[Fe III 7的Fe II(μ 4 -O 4)(μ-的Pz )12 X 4 ] -。Photoredox反应,配体X的特性-在古巴的350 nm稳态和351 nm激光闪光照射下观察到Fe(III)的Fe(III)电荷转移激发态。量子产率受到光碎片快速重