Synthesis, Structures, and Magnetic Properties of Fe2, Fe17, and Fe19 Oxo-Bridged Iron Clusters: The Stabilization of High Ground State Spins by Cluster Aggregates

Hierarchical Assembly of {Fe13} Oxygen‐Bridged Clusters into a Close‐Packed Superstructure

“…These aggregates prove to be magnetically interesting for the Fe III center because, although the overall coupling is antiferromagnetic, the pairwise interactions are unequal in magnitude over the whole molecule, thus leading to residual ground-state spins of up to 33/2 and a display of hysteresis of the magnetization. [3,[16][17][18] Thus, a secondary level of organization both in terms of the structure and properties of the compound is demonstrated. In the specific case we describe herein, the tripodal proligand nitrilotripropionic acid (H 3 ntp = N(CH 2 CH 2 COOH) 3 ) has been used to successfully trap {Fe 13 } aggregates (Figure 2), in which the production of the brucite lattice has effectively been arrested at the third generation.…”

High-Spin Molecules: A Novel Cyano-Bridged MnMo Molecular Cluster with aS=51/2 Ground State and Ferromagnetic Intercluster Ordering at Low Temperatures

“…[12] The importance of a high S value in molecular compounds has stimulated the search for new SMM, but until now molecules with S > 10 are very rare. [1,9] The highest value reported to date is S 33/2 3 for a cocrystallized Fe 17 and Fe 19 species. [9] The most accurately investigated system so far belongs to the series of manganese carboxylates of general formula [Mn 12 O 12 (RCOO) 16 ] with a varying number of water molecules.…”

Ein [Fe19]‐“Super‐Lindqvist”‐Aggregat und ein großes, sich durchdringendes, dreidimensionales Koordinationspolymer aus Solvothermalreaktionen von [Fe2(OtBu)6] mit Ethanol

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[2][3][4] 18, [5,6] 17, [7][8][9] 16, [10,11] 14 [12][13][14] und 13 [15,16] [24][25][26] Bisher wurde nur über sehr wenige molekulare Metall-Sauerstoff-Verbindungen mit mehr als drei m 6 -Oxo-Gruppen berichtet. [27][28][29][30] Ziel dieser Arbeit war die Synthese mehrkerniger EisenSauerstoff-Spezies mit mehr als zwei m 6 -Oxo-Gruppen.

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