Triammonium hexahydroxidooctadecaoxidohexamolybdogallate(III) heptahydrate

Abstract

The title compound, (NH4)3[GaMo6(OH)6O18]·7H2O, contains two centrosymmetric GaMo6 B-type Anderson cluster units consisting of central GaO6 octa­hedra surrounded by a hexa­gonal assembly of MoO6 edge-sharing octa­hedra. Like other B-type Anderson clusters, where the central Mo atom is substituted with a di- or trivalent metal ion, the central six μ3-oxido bridges are protonated. The average Ga—O bond length is 1.97 (1) Å, whereas the average Mo—O distances are 2.29 (2), 1.94 (1) and 1.709 (5) Å, respectively, for Mo—(μ3-OH), Mo—(μ2-O) and Mo=O bonds. In the crystal structure, the Ga(μ3-OH)6Mo6O18 3− polyanionic clusters are surrounded by NH4 + cations and solvent water mol­ecules, forming an extended network of hydrogen bonds.

Photoluminescence Properties of Two Closely Related Isostructural Series Based on Anderson-Evans Cluster Coordinated With Lanthanides [Ln(H2O)7{X(OH)6Mo6O18}]•yH2O, X = Al, Cr

“…The cluster assumes a near D 3d symmetry with dimensions ~8.6 × 8.6 × 2.7 Å and has been isolated with fifteen different heteroatoms till now [X: Al (Lee et al, 1991; Manikumari et al, 2002; Shivaiah et al, 2002; Martin et al, 2004; Shivaiah and Das, 2005; Liu et al, 2006; Dhara et al, 2007; Cao et al, 2008; Zhou et al, 2009), Cr (Perloff, 1970; An et al, 2006; Yu et al, 2006; Lee, 2007; Zhou and Yang, 2007; Shi D. et al, 2008; Shi D. M. et al, 2008; Zhang et al, 2008, 2014; Singh et al, 2010b, 2014; Li et al, 2011; Singh and Ramanan, 2011; Kumar et al, 2014a; Joo et al, 2015), Mn (He et al, 2012; Oms et al, 2012; Rosnes et al, 2012, 2013; Yan et al, 2012; Zhang et al, 2012, 2015a,b; Hutin et al, 2013; Ai et al, 2014; Yvon et al, 2014), Fe (Wu et al, 2001), Co (Nolan et al, 1996; Panneerselvam et al, 1996; Lee and Joo, 2000a; Lee et al, 2001; Martin et al, 2004), Ni (Lee et al, 2002; Liu et al, 2007; Liu F.-X. et al, 2008), Cu (Ito et al, 1989), Zn (Allen et al, 1997), Ga (Mensinger et al, 2008; Himeno et al, 2009), Te (Evans, 1948; Kondo et al, 1980; Robl and Frost, 1993a,b; Lorenzo-Luis et al, 1999; Drewes et al, 2004a,b; Charushnikova et al, 2005; Drewes and Krebs, 2005; Gao et al, 2007; Liu Y. et al, 2008; Yan et al, 2008), Rh (Ozawa et al, 1991), Pd (Ozawa et al, 1991), Sb (Ogawa et al, 1988; Yan et al, 2014), I (Kondo et al, 1980; Rosu and Weakley, 2000; An et al, 2005)and Pt (Lee and Sasaki, 1984; Lee, 1994; Lee and Joo, 2000b, …”

Transmetalation of Aqueous Inorganic Clusters: A Useful Route to the Synthesis of Heterometallic Aluminum and Indium Hydroxo—Aquo Clusters

“…The metal-exchange phenomenon has been exhibited in several examples of polyoxometalate structures. − Electrospray ionization mass spectroscopy (ESI-MS) characterization was used to identify mixed-metal phosphate-centered Keggin ions in aqueous tungsten and phosphododecametalate solutions. , Similar experiments for niobate/tantalate and Mo/V–selenite systems showed additional mixed-metal species. Altering the pH conditions of monomeric salt solutions has led to the substitution of the central metal ion of Keggin Al 13 by Ga, Fe, or Ge as well as a variety of di- and trivalent metal ions into the Anderson cluster [Mo 7 O 24 ] 6– . − We explored the potential for metal exchange in tridecameric clusters and discovered that such a process occurs when mixing Al 13 and In­(NO 3 ) 3 . As a result indium ions substitute into the exterior metal sites of the cluster to produce Al 7 In 6 (Figure ).…”

A route to a Keggin-Type α-[(XIIIO4)Mo12O35(OH)]4− anion through an Anderson-type [XIII(OH)6Mo6O18]3− anion: X = Ga

“…2-8 On the other hand, a number of Anderson-type Mo VI complexes, [M(OH) 6 Mo 6 O 18 ] 3/4have already been prepared from aqueous solution. [18][19][20][21][22][23][24][25][26][27] In fact, the present study found the formation of [Ga(OH) 6 Mo 6 O 18 ] 3in aqueous Mo VI -Ga III system (pH 1.3-5). Thus, a cis-MoO 2 arrangement is usually found for the polyoxomolybdate structure.…”

“…11- 17 The group II, III elements are known to form Anderson-type Mo VI complexes with planar configuration in aqueous solution. [18][19][20][21][22][23][24][25][26][27] Although Gao et al recently prepared Keggin-type [XMo 12 O 40 ] 6-(X = Co II , Ni II ) complexes, 28 the preparation of Keggin-type Mo VI complexes with the group II, III elements seems still challenging in the POM chemistry.…”

“…Later, Mensinger et al determined the X-ray crystallographic structure of (NH 4 ) 3 [GaMo 6 (OH) 6 O 18 ]•7H 2 O. 20 Tsiganok et al prepared a yellow complex by heating an aqueous solution (pH 1.5) containing high concentrations of Mo VI and Ga III at 363 K. 21 On the basis of UV, IR, 71 Ga and 17 O NMR measurements, the yellow complex was regarded as the Keggin structure. To our knowledge, however, no X-ray structural characterization has been made on the Keggin-type gallatomolybdate complex.…”