In this study, oxidation of some 3,5-diacyl or 3,5-diester 1,4-dihydropyridines to corresponding pyridine derivatives using sodium bromate in the presence of NH4Cl, NaHSO4 and Bu4NHSO4 under thermal conditions has been investigated. The yield and structure of formed products is similar under all conditions; however, the reaction is accelerated in the presence of Bu4NHSO4 and NaHSO4. In addition...

The anion-binding properties of two tripodal-based hexaureas appended with the m-nitrophenyl (1) and pentafluorophenyl (2) groups have been studied both experimentally and theoretically, showing strong affinities for sulfate over other inorganic oxoanions such as hydrogen sulfate, dihydrogen phosphate, bicarbonate, nitrate, and perchlorate. The structural analysis of the sulfate complex with 1 ...

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In the title compound, C(13)H(28)N(2) (2+)·SO(4) (2-)·H(2)O, extensive hydrogen-bonding inter-actions between the protonated 4,4'-(propane-1,3-di-yl)dipiperidinium ions, the sulfate anions and the water mol-ecules lead to a three-dimensional pillared and layered structure with the 4,4'-(propane-1,3-di-yl)-dipiperidinium ions acting as the pillars.

Structural characterization of a hydrogen sulfate complex with a tren-based urea suggests that the anion is coordinated with six NH···O bonds (d(N···O) = 2.857 (3) to 3.092 (3) Å) and one OH···O bond (d(O···O) = 2.57 (2) Å) from three receptors; however, in solution the anion is bound within the pseudo-cavity of one receptor.

The title compound, [Nd(OH)(SO(4))](n), was obtained hydro-thermally from an aqueous solution of neodymium nitrate, 1,2-propane-diamine and sulfuric acid. The structure features nona-coordinated neodymium with sulfate and hydroxide anions acting as bridging ligands. The OH group forms a weak O-H⋯O hydrogen bond with an O⋯O distance of 3.224 (5) Å.

The title compound, [Ni(C(6)H(15)NO(3))(2)]SO(4), contains two triethano-lamine (TEA) ligands bound to an Ni(2+) metal centre, which lies on a crystallographic inversion centre, and one sulfate anion located on a twofold rotation axis such that the asymmetric unit contains one-half molecule of the cation and of the anion. The triethano-lamine ligands coordinate via each axial N atom and two of ...

The structure of the title compound, (C(14)H(16)N)(2)[HgCl(2)(SO(4))], consists of an infinite chain propagating along the c direction, containing Hg(II) ions tetra-coordinated by two bridging O atoms of bis-monodentate sulfate anions and two chloride ligands. In the the crystal, N-H⋯O hydrogen bonding between the cations and the anionic chains consolidates the packing. The crystal structure wa...

In the title compound, [Mg(SO(4))(C(12)H(8)N(2))(H(2)O)(3)], the Mg(II) centre exhibits a slightly distorted octa-hedral coordination environment defined by two N atoms from a 1,10-phenanthroline mol-ecule, one O atom from a sulfate dianion and three meridionally arranged O atoms from coordinated water mol-ecules. The crystal structure involves intra- and intermolecular O-H⋯O hydrogen bonds.

Four new hybrid inorganic–organic salts of 1,4-diazabicyclo[2.2.2]octane N,N’-dioxide (odabco) with the formulae odabco·2HNO3 (1), odabco·HClO4 (2), odabco·H2SO4 (3) and odabco·2H2SO4 (4) were synthesized characterized by single-crystal x-ray diffraction (XRD), powder XRD infrared spectroscopy. Compound 1 is based on isolated (H2odabco)2+ fragments, representing 0D structure. 2 cationic 1D {Hod...