A Trinuclear Iron(III) Compound with an Unusual T-Shaped [Fe-3(mu(3)-O)](7+) Core

作者：Jones Leigh F; Kilner Colin A; Halcrow Malcolm A^*

来源：Journal of Cluster Science, 2010, 21(3): 279-290.

DOI：10.1007/s10876-010-0283-0

• Iron
• Trinuclear
• Crystal structure
• Magnetic measurements

Treatment. of FeCl3 with 1 equiv of 3-(pyrid-2-yl)-5-(tertbutyl)-1 H-pyrazole (L) in basic methanol affords crystalline [Fe3Cl5(mu(3)-O)(mu-OMe)(2)L-2 (MeOH)] in moderate yield. The compound has an unusual isosceles triangular [Fe-3(mu(3)-O)(mu-OMe)(2)](5+) core with one unbridged edge. Two of the iron(III) centres in the compound are approximately octahedral, while the third has a five-coordinate geometry. Magnetic susceptibility measurements show antiferromagnetic coupling between the iron centres, leading to a S = 3/2 magnetic ground state and S = 5/2 excited state that are almost accidentally degenerate according to simulation. An analogous reaction using Fe[ClO4](3) as starting material instead affords the low-spin iron(II) complex [FeL3][ClO4](2).

• 出版日期2010-9