A 3D all-inorganic architecture based on the [H2W12O42]10− building block with different alkaline-earth metal linkers: crystal structures, surface photovoltage and photoluminescent properties

Nanocomposites of Metallic Silver with Octamolybdate Amine Complexes of Nickel(II) and Copper(II)

“…As in the case of other POM compounds [16,17], the presence of a number of bands in the visible region of the spectrum is characteristic for the luminescence spectra of the studied octamolybdates. Considering the somewhat different appearance of the spectra for 1 and 2, we can assume that a certain effect on the energy of the transitions comes from the nature of the cation, which may create additional energy sublevels in the bandgap, leading to broadening of the emission bands and the appearance of additional shoulders on the photoluminescence peaks [16]. The presence of silver nanoparticles in the composites Ag@1¢ and Ag@2¢ leads to the appearance of two main luminescence bands (420 nm and 489 nm for Ag@1¢, and 427 nm and 482 nm for Ag@2¢) of somewhat greater intensity (Fig.…”

Novel Three-Dimensional Organic–Inorganic Heterometallic Hybrid Built by Sandwich-Type Tetra-Mn-Substituted Germanotungstates through Mixed 3d and 4f Metal Linkers

“…(iii) Anderson-type POM-based materials, which can be exemplified by a rare 3D alumomolybdate [Na 4 (H 2 O) 14 Cu(PDA) 2 ]H[Al(OH) 6 Mo 6 O 18 ]·5 H 2 O (H 2 PDA= pyrazine-2,3-dicarboxylic acid) constructed from Anderson-type [Al(OH) 6 Mo 6 O 18 ] 3– moieties, tetrameric [Na 4 (H 2 O) 14 ] 4+ clusters, and [Cu(PDA) 2 ] 2– cations . (iv) POM-based materials based on various isopolyoxoanion units such as [Ag(CH 3 CN) 3 ] 2 [Ag(CH 3 CN) 2 ] 2 [W 10 O 32 ] and [Ag(CH 3 CN) 4 ]⊂{[Ag (CH 3 CN) 2 ] 4 [H 3 W 12 O 40 ]} as well as a class of 3D inorganic materials based on [H 2 W 12 O 42 ] 10– building blocks and different alkaline-earth metal linkers (Ca 2+ , Sr 2+ , and Ba 2+ ). , As a continuous exploration of novel-extended POM-based aggregates with the ‘‘property-adding” feature, recently, an effective strategy was concentrated on the introduction of new POM building blocks (beside the commonly used POM precursors) to obtain charming structures and construct multifunctional frameworks of hybrid materials . In this aspect, a large subfamily of sandwich-type transition-metal-substituted POTs (TMSPs), as some of the most representative POM species, have the larger volume and the more-negative charge than those of the commonly used POMs, which allow the formation of higher coordination numbers with metal cations and should be an ideal class of candidates for constructing the high-dimensional extended materials …”