Coordination Studies of Bis-Strapped-Hanging-Carboxylate Porphyrins. X-ray Characterization of a Five-Coordinate Iron(II) Complex with a Built-in Axial Base

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• 作者：Ismail Hijazi ; Thierry Roisnel ; Marc Fourmigu ; Jean Weiss ; Bernard Boitrel
• 刊名：Inorganic Chemistry
• 出版年：2010
• 出版时间：April 5, 2010
• 年：2010
• 卷：49
• 期：7
• 页码：3098-3100
• 全文大小：716K
• 年卷期：v.49,no.7(April 5, 2010)
• ISSN：1520-510X

文摘

The comparison of two series of preorganized strapped porphyrins, derived from both the αβαβ and ααββ conformers of meso-tetrakis(aminophenyl)porphyrin, and the coordination studies of their affinity for O₂ are reported. Both series of ligands bear a proximal built-in axial base and a polar distal side defined by either a hanging malonyl ester or a hanging malonic acid residue. In the αβαβ model, the carboxylic acid groups are maintained in an apical location at a fixed distance from the distal oxygen atom of iron-bound O₂. A particular emphasis is placed on the ααββ series, for which the crystal structure of the five-coordinate (S = 2) iron(II) ester complex was determined. In this series, the distal strap can adopt either a tilted conformation or a vertical position over the Fe^II core, allowing changes in the distance between the carboxylic groups and the bound O₂.