X-RAY-ABSORPTION PRE-EDGE STUDIES OF HIGH-SPIN IRON(II) COMPLEXES
X-RAY-ABSORPTION PRE-EDGE STUDIES OF HIGH-SPIN IRON(II) COMPLEXES
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DOI：
10.1021/ic00109a007
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发表时间：
1995-03-01
影响因子：
4.6
通讯作者：
QUE, L
中科院分区：
文献类型：
--
作者：
RANDALL, CR;SHU, LJ;QUE, L
Fe K 边 X 射线吸收光谱用于研究一系列 22 种合成的高自旋铁 (II) 配合物。对每个配合物的1s→3d前边缘峰进行定量并与其他配合物进行比较，以探索其与铁中心的配位数和对称性的校正。与高自旋铁 (III) 配合物 (Roe, A.L,; Schneider,D.J.; Mayer, R.J.; Pyrz,J.W. Que,L.,Jr. J. Am. Chem. Soc. 1984, 106, 1676-1681) 一样，铁 (II) 配合物可以根据其归一化前边缘峰值强度进行分组：六坐标复合体有 4 到 6 个单位的预边缘区域，五坐标复合体有 8 到 13 个单位，四面体有 16 到 21 个单位。所检查的三个六配位“铁(II)”亚硝酰络合物由于其高度扭曲的几何形状，其预边缘区域与正常铁(II)五配位络合物的预边缘区域相当。此处获得的信息可用于确定含铁 (II) 蛋白质和其他模型复合物中高自旋铁 (II) 中心的配位数，并补充基于扩展 X 射线吸收精细结构 (EXAFS) 的分析。
Fe K-edge X-ray absorption spectroscopy is utilized to study a series of 22 synthetic high-spin iron(II) complexes. The 1s --> 3d pre-edge peak of each complex is quantitated and compared with the others in order to explore its correction with the coordination number and symmetry of the iron center. Like the high-spin iron(III) complexes (Roe,A.L,; Schneider,D.J.; Mayer,R.J.; Pyrz,J.W. Que,L.,Jr. J. Am. Chem. Soc. 1984, 106, 1676-1681), the iron(ll) complexes can be grouped on the basis of their normalized pre-edge peak intensities: the six-coordinate complexes have pre-edge areas from 4 to 6 units, the five-coordinate from 8 to 13 units, and the tetrahedral 16 to 21 units. Three six-coordinate ''iron(II)'' nitrosyl complexes examined have pre-edge areas comparable to those of normal iron(II) five-coordinate complexes due to their highly distorted geometry. The information obtained here can be used to deter;niiie the coordination number of the high-spin iron(lI) centers in iron(II)-containing proteins and other model complexes and to complement analyses based on extended X-ray absorption fine structure (EXAFS).