Magnetic interactions in a copper(II) trimer encapsulated in a molecular metal oxide cluster

Magnetic Properties of Lone‐Pair‐Containing, Sandwich‐Type Polyoxoanions: A Detailed Study of the Heteroatomic Effect

“…Polyoxoanions can be considered as intermediate in complexity between monomeric metal coordination complexes and high‐spin multinuclear clusters that have received considerable attention 9−12. Since in polyoxoanions the magnetic fragment is usually encapsulated by a diamagnetic tungsten−oxo cluster, they provide ideal structural supports for the study of the magnetic exchange interactions in clusters 13,14…”

Structural Characterization and Magnetic Properties of Sandwich-Type Tungstoarsenate Complexes. Study of a Mixed-Valent VIV2/VV Heteropolyanion

“…Polyoxotungstates containing three paramagnetic centers can be obtained from these trivacant Keggin species, and inorganic complexes of [α-AsW 9 O 33 ] 9- with divalent metal ions have been reported . Nevertheless, only the Cu II complex has been structurally characterized and magnetically studied . In [As 2 W 18 {Cu 3 (H 2 O) 2 }O 66 ] 12- , a nearly equilateral triangle is formed by the d 1 centers, with an average Cu−Cu distance of 4.682 Å.…”

Hervé and Krebs Type Magnetic Polyoxometalate Dimers

“…The magnetic properties of this compound, reported in 1988, showed intramolecular anti-ferromagnetic coupling between the Cu atoms with J = -7.5 K (~ -5.2 cm -1 ). [41] In 2001, the latter species were revisited when a group of [(α-XW9O33)2M3(H2O)3] 12− where M = Cu II , Zn II ; X = As III , Sb III was reported. [39] The principal difference in the formation of [(M(H2O)3)3(α-AsW9O33)2] 12− (pH range = 6.2 -6.9) versus [(M(OH2))2(WO(H2O))(α-AsW9O33)2] 10− (pH range = 3.9 -4.8) is the pH maintained during synthesis.…”