Abstract
AbstractA new ligand, H5L3, has been synthesized featuring seven linearly arranged oxygen donors in form of two 1,3‐diketone and three phenol groups. The X‐ray structure of H5L3 unveils a rare case where one of the diketones is in the enolic form and the other one in the bis(carbonyl) form. This structure is shown by 1H NMR to persist in solution. Reaction of H5L3 with Mn(AcO)2 in pyridine leads to the novel tetranuclear cluster [Mn4(H2L3)2(OAc)2(py)5] (1), which displays an unusual core in form of a zig‐zag chain. Bulk magnetic measurements revealed the existence of weak antiferromagnetic coupling within the molecule. Numerical fits to a model described by the Hamiltonian H = –2J1(S1S2 + S3S4) – 2J2(S2S3) yield coupling constants of J1 = –2.23 cm–1, J2 = –0.85 cm–1 and g = 2.08. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
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