Tripotassium hexahydrogen hexamolybdocobaltate(III) heptahydrate, K₃[H₆CoMo₆O₂₄]·7H₂O

Abstract

The very stable title crystals, K3[H6CoMo6O24]·7H2O, that include the well known B‐type Anderson–Evans heteropolyoxometalate, were obtained by recrystallization of powder K3[H6CoMo6O24]·nH2O at pH 3.5. The unit cell consists of two different crystallographically discrete [H6CoMo6O24]3− polyanions. The two anions have the Co atoms at inversion centers and have close to m symmetry, with Co—O bond lengths in the range 1.898 (3)–1.912 (3) Å, Mo—O bond lengths in the ranges 1.700 (4)–1.726 (4), 1.895 (3)–1.960 (3) and 2.259 (3)–2.313 (3) Å.

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

“…Anderson-Evans cluster, as it has been known since, is made of six edge-shared distorted {MoO 6 } octahedra and the central cavity thus formed is occupied by slightly flattened, X(OH) 6 , heteroatom octahedron. 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, 2...…”

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.…”

“…† It is known that Anderson complexes with Cr III , Al III and Co III as the central heteroion are also hexaprotonated. 23,26,27 The present structure was isostructural with that of K 3 [Co(OH) 6 Mo 6 O 18 ]•7H 2 O, 25 and exhibited a slightly smaller monoclinic cell than the latter (2879.4(6) A ˚3 for Ga and 2881.5(9) A ˚3 for Co).…”

“…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.…”

Triammonium hexahydroxidooctadecaoxidohexamolybdogallate(III) heptahydrate

“…The positions of two NH 4 + cations found in the structure of (I) are close to positions of the K cations found in the structure of K 3 [Co(µ 3 -OH) 6 Mo 6 O 18 ] . 7H 2 O (Lee et al, 2001), but the position of the third one is different against the positions of the third K cation in the potassium compound. Both structures crystallize in the same space groups and exhibit similar lattice parameters of the unit cells.…”