Synthesis, Structure and Characterizations in Solid State and Solution of Dinuclear Pentacoordinated FeII and MnII Complexes and of a Linear Tetranuclear FeIII Complex Obtained with the Ligand N,N,N′,N′-Tetrakis[(6-methyl-2-pyridyl)methyl]propane-1,3-diamine
✍ Scribed by Véronique Balland; Elodie Anxolabéhère-Mallart; Frédéric Banse; Eric Rivière; Sophie Bourcier; Martine Nierlich; Jean-Jacques Girerd
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 196 KB
- Volume
- 2004
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
Two neutral complexes [(L~6~^3^4M)Fe~2~Cl~4~]·2H~2~O·2CHCl~3~ (1) and [(L~6~^3^4M)Mn~2~Cl~4~]·CH~3~CN (2) have been synthesized {L~6~^3^4M = N,N,N′,N′‐tetrakis[(6‐methyl‐2‐pyridyl)methyl]propane‐1,3‐diamine} and their molecular structures established by X‐ray crystallography. Both structures are similar, with each metal center in a trigonal‐bipyramidal environment. No magnetic coupling is observed between the metal centers. UV/Vis spectra and cyclic voltammograms were recorded in CH~2~Cl~2~ and CH~3~CN solutions. Both complexes are stable in CH~2~Cl~2~, whereas only 2 is stable in CH~3~CN. On the contrary, 1 is in equilibrium with another Fe^II^ species in CH~3~CN. When this last solution is aerated, monocrystals of the neutral linear tetranuclear complex [(L~6~^3^4M)Fe~4~(μ‐O)~3~Cl~6~]·2CH~3~CN (3) can be isolated. Its structure is unusual with two Fe^III^ ions pentacoordinate and the two others tetracoordinate with only chloro ligands and oxo bridges. The magnetic properties reveal that two consecutive metal centers are strongly antiferromagnetically coupled. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)