3d–4f Heterometallic cluster incorporated polyoxoniobates with magnetic properties

Abstract

A series of 3d-4f heterometallic cluster incorporated polyoxoniobates (PONbs) with different magnetic properties were first made and characterized. This work not only provides a promising strategy to make new heterometallic...

Recent advances in polyoxometalate-based lanthanide–oxo clusters

“…The reported POMs-based LnOCs involve polyoxotungstates, polyoxoniobates, polyoxomolybdates, etc. [42][43][44]. Here we summarize the polyoxotungstates-related LnOCs, which can be classified into three main categories based on the inner metal species of the cluster: pure 4f clusters, d-4f clusters, and p-4f clusters.…”

Proton-Conductive Polyoxometalate Architectures Constructed from Lanthanide-Incorporated Polyoxoniobate Cages

“…In comparison, the development of Ln-incorporated PONb chemistry is still in its infancy due to multiple challenges, including the low reaction activity of niobates, the absence of soluble niobate oxoanion precursors, the rather limited working pH range, and especially the incompatibility of acidic Ln ions and basic PONb clusters. − To be more specific, Ln ions tend to hydrolyze into insoluble Ln hydroxides/oxides in alkaline conditions, resulting in amorphous precipitation, making them difficult to obtain Ln-incorporated PONb clusters. So far, only a handful of Ln-incorporated PONb clusters have been reported. − For instance, in 1994, Yamase’s group reported the first PONb containing Ln ions, Na 7 H 19 {[Eu 3 ­Al 2 O­(H 2 O) 3 (OH) 3 ] 2 ­(Nb 6 O 19 ) 5 }·47H 2 O . The successful synthesis of the compound proved that acidophilic Ln ions could also be introduced into PONbs in alkaline conditions.…”

Cadmium-containing windmill-like heteropolyoxoniobate macrocycle with high yield for catalyzing Knoevenagel condensation

“…These H + ions cannot be located crystallographically and are assumed to be delocalized over Cd 3 Si 3 Nb 54 , which is common in POM chemistry. 14 Such a macrocycle cluster further grows into a cyclic cluster dimer through centrosymmetric (Fig. 1c and S7b†) interactions, via non-covalent interactions, including strong electrostatic interactions with the help of counter cations (Fig.…”