Pallepogu Raghavaiah

Sulfate anion helices formed by the assistance of a flip-flop water chain

A flip-flop extended water structure assists the formation of sulfate anion helices (both left- and right-handed) in a crystalline hydrate of a simple organic-inorganic compound [C6H10N2]SO4. 1.5H2O (1).

Synthesis, characterization and photochemistry of a new heptamolybdate supported magnesium-aqua coordination complex

AbstractThe synthesis, crystal structure, redox characteristics and photochemistry of a new heptamolybdate supported magnesium-aqua coordination complex viz. (hmtH)2[{Mg(H2O)5}2{Mo7O24}] ⋅3H2O 1 (hmt = hexamethylenetetramine) is reported. The cyclic voltammogram reveals quasireversible redox behaviour while the degradation of rhodamine B (RhB) by 1 under sunlight irradiation indicates its photocatalytic activity. In the crystal structure of 1, two [Mg(H2O)5]2+ units are linked by a μ2-bridging bidentate heptamolybdate ligand resulting in a heptamolybdate supported magnesium-aqua coordinated dianionic complex [{Mg(H2O)5}2{Mo7O24}] 2− charge balanced by two (hmtH) + cations. The cations, anions and the lattice water molecules are linked by several hydrogen bonding interactions.n Graphical AbstractSynthesis and structural characterization of a new heptamolybdate supported magnesiumaqua coordination complex exhibiting redox and photocatalytic behaviour is reported.

Heptaaqua(4-nitrobenzoato-κ2O,O′)strontium(II) 4-nitrobenzoate dihydrate

The title compound, [Sr(C7H4NO4)(H2O)7](C7H4NO4)·2H2O, was synthesized from the aqueous reaction of strontium carbonate with 4-nitroxadbenzoic acid. The structure consists of a nine-coordinate heptaxadaquaxad(4-nitroxadbenzoato-κ2O,O′)strontium(II) complex cation, an uncoordinated 4-nitroxadbenzoate anion and two solvent water molxadecules. The cations, anions and solvent water molxadecules are linked with the aid of several O—H⋯O and C—H⋯O interxadactions, resulting in a three-dimensional hydrogen-bonding network. The hydrogen bonding between a solvent water molxadecule and a symmetry-related solvent water molxadecule results in the formation of a water dimer.

Bis[benzyl(methyl)ammonium] tetrasulfidotungstate(VI)

The title compound, (C8H12N)2[WS4], was synthesized by the aqueous reaction of ammonium tetraxadsulfidotungstate(VI) with benzxadyl(methxadyl)amine in a 1:2 molar ratio. The compound is isotypic with the corresponding Mo analogue, (C8H12N)2[MoS4], and its structure consists of a slightly distorted tetraxadhedral [WS4]2− dianion and two crystallographically independent benzxadyl(methxadyl)ammonium cations, with all atoms located in general positions. The cations and anion are linked by weak N—H⋯S and C—H⋯S interxadactions, the strength and number of which can explain the observed W—S bond distances.

3-Oxapentane-1,5-diyl bis(allylsulfonate)

The title compound, C10H18O7S2, was synthesized by reacting diethylxadene glycol with allyl chloroxadsulfonate in the presence of pyridine. The asymmetric unit consists of half a molxadecule, which is located on a twofold rotation axis. In the crystal structure, the molxadecules are involved in several weak C—H⋯O interxadactions.

Bis[benzyl(methyl)ammonium] tetrathiomolybdate(VI)

The title compound, (C8H12N)2[MoS4], was synthesized by the aqueous reaction of ammonium tetraxadthioxadmolybdate with benzylxad(methyl)xadamine in a 1:2 molar ratio. The structure consists of a slightly distorted tetraxadhedral [MoS4]2− dianion and two crystallographically independent benzylxad(methyl)xadammonium cations, with all atoms located in general positions. The cations and anions are linked by weak N—H⋯S and C—H⋯S interxadactions, the strength and number of which can explain the observed Mo—S bond distances.