Polyoxometalates: Toward new materials

Abstract

This article describes an account of some of our polyoxometalate (POM)-based research, we have been doing in our laboratory last several years. There are several well-defined POM cluster anions, that are structurally characterized. We have chosen Anderson-type of heteropolyanion [Al(OH) 6 Mo 6 O 18 ] 3− and explored its linking propensity in different dimensions using 's', 'd' and 'f' block elements as linkers. We have demonstrated how a lanthanide linker provides a new pathway in forming a two-dimensional linked {As 8 V 14 } system [{Ln(H 2 O) 6 } 2 As 8 V 14 O 42 (SO 3 )] n · 8nH 2 O, that is derived from discrete {As 8 V 14 } cluster containing compound (NH 4 ) 6 [As 8 V 14 O 42 (SO 3 )]. A polyoxometalate compound has been described in which a reduced tungstovanadate-heteropolyanion clusters get linked via capped V = O groups into one-dimensional chains. All these systems have already been reported elsewhere. The last portion of this article will be described by a new system [3-ampH] 6 [V 10 O 28 ] · 2H 2 O having discrete molecular structure and extended supramolecular structure.

A Versatile Polyoxovanadate in Diverse Cation Matrices: A Supramolecular Perspective

“…A summary of the crystallographic data and structure determination parameters are described in Table 1 for compounds 1–2 , in Table 2 for compounds 3 – 5 and in Table 3 for compounds 6 and 7 . Bond lengths and angles for decavanadate anionic cluster for 1 (as it is common cluster for all compounds) are provided in Table S1 they are in good agreement with those of reported decavanadate cluster anion [V 10 O 28 ] 6− (Rao et al, 2011). CCDC- 1840294 (for compound 3 ), - 1840295 (for compound 4 ), - 1840296 (for compound 5 ), - 1840297 (for compound 6 ) and - 1840298 (for compound 7 ) contain the supplementary crystallographic data for this paper.…”

“…The modern chemical research on polyoxometalates (POMs)-based solid state materials fascinates synthetic chemists because of their potential applications in diverse research areas, such as, catalysis (Vazylyev et al, 2005; Hill, 2007; Zhou et al, 2014; Lechner et al, 2016; Mukhopadhyay et al, 2018), medicinal chemistry (Pope and Müller, 1991; Liu et al, 2012; Xie et al, 2018), and materials science (Guo et al, 2000; Rao et al, 2011; Kulikov and Meyer, 2013; Omwoma et al, 2015; Walsh et al, 2016). Among these, the area of polyoxovanadate (henceforth, POV) based materials have received special attention due to not only their diverse topologies (Miiller et al, 1990; Klemperer et al, 1992; Chen et al, 2005), structural (Miiller et al, 1987; Koene et al, 1999) and electronic properties (Müller et al, 1997) but also their fascinating versatile industrial applications, e.g., catalysis (Gao and Hua, 2006) and materials applications (Khan et al, 2003; Arumuganathan and Das, 2009; Chen et al, 2018).…”

Dye-sensitized polyoxometalate for visible-light-driven photoelectrochemical cells

“…As a rich family of early transition metal-oxygen anion clusters, polyoxometalates (POMs) have attracted tremendous attention over the past few decades due to their promising applications in catalysis, biology, magnetism, optics, materials science and medicinal chemistry. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In particular, their nanosized geometry, unique optical characteristics, electronic properties, and excellent chemical reactivity make POMs more promising for the applications in photocatalysis and photovoltaics. [15][16][17][18][19][20][21] However, one major drawback of POMs for photoelectronic applications is their low or negligible absorption in the visible light region, which poses a limitation for the utilization of solar energy.…”

Enhanced Photocatalytic Efficacy of Hetropolyacid Pillared TiO<SUB>2</SUB> Nanocomposites

“…On the other hand HPAs is a well known versatile green catalyst Hetropolyacid (HPAs). [13][14][15] They are the class of molecularly defined inorganic metal-oxide clusters formed from early transition metals such as V, Nb, Ta, Mo, and W in their highest oxidation states. 16 Therefore HPAs can undergo stepwise multi electron redox reactions while their structure remains intact.…”