Unusual Fe9 and Fe18 structural types from the use of 2,6-pyridinedimethanol in FeIII cluster chemistry
作者： Taketo Taguchi , Michael S. Thompson , Khalil A. Abboud , George Christou
DOI: 10.1039/C0DT00635A
关键词:
摘要: The syntheses, crystal structures and magnetochemical characterization are reported for two new FeIII complexes [Fe18O6(OH)8(pdm)10(pdmH)4(H2O)4](ClO4)10 (3) [Fe9O4(OH)2(O2CMe)10(pdm)(pdmH)4](NO3) (4). They were synthesized from the use of potentially O,N,O tridentate chelate, 2,6-pyridinedimethanol (pdmH2), in presence or absence carboxylate groups. Octadecanuclear complex 3 was obtained during reactivity studies on previously-reported [Fe8O3(OEt)(pdm)4(pdmH)4(EtOH)2](ClO4)5 (2), latter undergoing hydrolysis to recrystallization undried MeCN. reaction pdmH2 with preformed [Fe3O(O2CMe)6(py)3](NO3) CH2Cl2 gave enneanuclear 4. Both 4 unprecedented structural types. core comprises a central [Fe4O6] defective-dicubane attached either side [Fe7O11] unit, which can be described as [Fe4(μ4-O)] tetrahedra fused at common Fe atom. considered four vertex-fused triangular [Fe3(μ3-O)] units. Variable-temperature (T) -field (H) solid-state dc ac magnetization (M) carried out 1.8–300 K range. Analysis data revealed that possess an S = 5/2 ground state spin, respectively.
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