Piñero Dalice, Baran Peter, Boca Roman, Herchel Radovan, Klein Michael, Raptis Raphael G, Renz Franz, Sanakis Yiannis
Department of Chemistry and the Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, PR, Puerto Rico.
Inorg Chem. 2007 Dec 24;46(26):10981-9. doi: 10.1021/ic0701460. Epub 2007 Nov 29.
A comparison is made between the structural, spectroscopic, electrochemical, and magnetic properties of pyrazolate versus carboxylate complexes [Fe3(mu3(mu3O)(mu-LL)6Cl3]2- containing the Fe3(mu3-O)-motif. While the Fe3(mu3-O)-cores are structurally indistinguishable in the two types of complexes, their magnetic properties deviate from the expected values as a result of a through-pyrazole contribution to the overall antiferromagnetic exchange with J1/hc = -80.1 cm(-1) and J2/hc = -72.4 cm(-1), or J1/hc = 70.6 cm(-1) and J2/hc = -80.8 cm(-1), (Hex = -J1(S1S2 + S2S3) - J2S1S3). The magnetic properties of the pyrazolate complexes are further tuned by an antisymmetric exchange interaction term.
对含有Fe3(μ3 - O)结构基序的吡唑酸盐与羧酸盐配合物[Fe3(μ3(μ3O)(μ - LL)6Cl3]2 - 的结构、光谱、电化学和磁性进行了比较。虽然在这两种配合物中Fe3(μ3 - O)核心在结构上难以区分,但由于吡唑对整体反铁磁交换的贡献,其磁性偏离了预期值,其中J1/hc = - 80.1 cm(-1),J2/hc = - 72.4 cm(-1),或J1/hc = 70.6 cm(-1),J2/hc = - 80.8 cm(-1),(Hex = - J1(S1S2 + S2S3) - J2S1S3)。吡唑酸盐配合物的磁性通过反对称交换相互作用项进一步调节。