[H_xTeV₉O₂₈]^(5–x)– (x = 1 and 2): Vanadotellurates with Decavanadate Structure

Abstract

Two new vanadotellurates, [HTeV(9)O(28)](4-) and [H(2)TeV(9)O(28)](3-) have been synthesized and structurally characterized as tetra-n-butylammonium (TBA) salts: TBA(4)[HTeV(9)O(28)]·2CH(3)CN [triclinic, space group P ̅1, a = 16.7102(6) Å, b = 17.4680(7) Å, c = 17.9634(7) Å, α = 74.412(1)°, β = 67.494(1)°, γ = 74.160(2)°, Z = 2] and TBA(3)[H(2)TeV(9)O(28)] [monoclinic, space group P2(1)/c, a = 13.0013(5) Å, b = 19.157(1) Å, c = 28.453(1) Å, β = 97.222(2)°, Z = 4]. The results of the structural analyses indicate that the four O atoms that bridge two V atoms on the Te side are the most basic ones in the structure. The results of density-functional theory (DFT) calculations support this view.

Tetraquinolinium ditelluro(VI)octavanadate(V) octahydrate

“…The TeO 6 octahedra are less distorted in comparison with VO 6 ocathedra since the Te-O distances vary from 1.765 (6) to 2.080 (7) Å. Similar trends are also observable for similar heteropolyanion (Konaka et al, 2008;Konaka et al, 2011). The quinolinium cations exhibit the typical ranges in bond lengths and angles as found in the related structures (Hemissi et al, 2010).…”

“…For bond-valence calculations, see: Brown & Altermatt (1985). For geometrical features in related structures, see: Lee et al (2008); Joo et al (2011); Strukan et al (1997); Konaka et al (2008Konaka et al ( , 2011; Evans et al (1966); Hemissi et al (2010).…”

“…Nevertheless, incorporation of other elements besides vanadium into this structural type has not been reported yet. In particular, substitution of one or more vanadium atoms by Pt IV (Lee et al, 2008;Joo et al, 2011), Mo VI (Strukan et al, 1997) and Te VI (Konaka et al, 2008;Konaka et al, 2011) are investigated and resulted into novel materials with highly promising catalytic properties. To date in our knowledge, only two POVs incorporated one telluric, are known (Konaka et al, 2008).…”

Double salt crystal structure of nonasodium dihydrogen nonavanadoplatinate(IV) trihydrogen nonavanadoplatinate(IV) tetracontahydrate: stepwise-protonated nonavanadoplatinate(IV)

“…The same heteropolyanions were also reported as the guanidinium salt, (CH 6 N 3 ) 5 [H 2 PtV 9 O 28 ] (Joo et al, 2011) and as the potassium salt, K 5 [H 2 PtV 9 O 28 ]Á-9H 2 O . Konaka et al (2011) reported heteropolyanions that belong to the decavanadate structure type, including the Te derivative, [H n TeV 9 O 28 ] (5Àn)À (n = 1 or 2). However, the Te heteroatom in that polyanion was disordered over two sites, which correspond to the Pt1 or Pt2 and V4 or V13 sites in the title compound.…”

Crystal structure of pentapotassium dihydrogen nonavanadato(V)platinate(IV) nonahydrate

“…Two heteropolyanions that belong to the decavanadate structure system (Lee, 2006) have recently been reported: the tellurium derivative [H n TeV 9 O 28 ] (5Àn) (n = 1 and 2), described by Konaka et al (2011), and the platinum heteropolyoxidovanadate, [H 2 PtV 9 O 28 ] 5À , reported by our group in the form of its sodium salt, Na 5 [H 2 PtV 9 O 28 ]Á21H 2 O (Lee et al, 2008) and a guanidinium salt, (CH 6 N 3 ) 5 [H 2 PtV 9 O 28 ] (Joo et al, 2011). The Te heteroatom of the [H n TeV 9 O 28 ] (5Àn) polyanion was located on two sites (corresponding to the Pt1 and V4 sites in the title compound) by disorder.…”