ChemInform Abstract: [H_xTeV₉O₂₈]^(5‐x)‐ (x = 1 and 2): Vanadotellurates with Decavanadate Structure.

Abstract

H x TeV 9 O 28 ] (5-x)-(x = 1 and 2): Vanadotellurates with Decavanadate Structure. -The new vanadotellurates (III) and (IV) (crude yield given in gram) are characterized by single crystal XRD and DFT calculations. (III) crystallizes in the triclinic space group P1 with Z = 2 and (IV) in the monoclinic space group P21/c with Z = 4. The structure of the anions in (III) and (IV) is basically the same as that in decavanadate, [V 10 O 28 ] 6-. -(KONAKA, S.; OZAWA*, Y.; SHONAKA, T.; WATANABE, S.; YAGASAKI, A.; Inorg. Chem. 50 (2011) 13, 6183-6188, http://dx.doi.org/10.1021/ic200438p ; Dep. Mater. Sci., Univ. Hyogo, Himeji, Hyogo 678-12, Japan; Eng.) -W. Pewestorf 35-017

A Tellurium-Substituted Heteropolyniobate with Unique π–π Stacking and Ionic Conduction Property

“…From another point of view, the four TeO 6 octahedra were first joined by a Li + ion to form a plane, which was further sandwiched by two mutual perpendicular {Nb 4 O 18 } tetramers (Figure S2). The Te–O bond distances fall in the range of 1.878(3)–2.023(3) Å, and the Li–O bond length is 1.891(3) Å, respectively, which are consistent with those in the reported tellurium-substituted POMs − and LiO 4 -centered Keggin-type structures . Bond-valence-sum calculation confirms that the oxidation state values of niobium, copper, lithium, and tellurium atoms are 5+, 2+, 1+, and 6+, respectively (Table S2).…”

“…Tellurium is a very rare semimetallic chemical element in the oxygen group. Hexavalent tellurium is commonly used as a central octahedral heteroatom in Anderson-type POMs. , Besides, hexavalent tellurium is also found in some Dawson-like polyoxotungstates, Lindqvist-like polyoxovanadates, and Linkqvist-type polyoxoniobates in which the TeO 6 octahedron replaces the MO 6 octahedron of the POM skeleton or serves as a heteroatom. − Nevertheless, hexavalent tellurium is hardly seen in Keggin-type structures, although some lacunary Keggin-type POMs containing tetravalent triangular pyramidal TeO 3 groups as linkers or heteroatoms have been known. − Therefore, the study of the hexavalent tellurium-substituted Keggin-type structure remains an interesting scientific topic worthy of further exploration. In this work, we report a novel tetratellurium-substituted Keggin-type heteropolyoxoniobate, namely, K 2 H­[Cu­(phen)­(H 2 O)] 4 [Cu­(phen)] 2 [(LiNb 8 Te 4 O 40 )]·34H 2 O ( 1 ; phen = 1,10-phenanthroline).…”