pH dependency of calcium(II) binding constant with 2,7-bis(4'-chloro-2'-phosphonophenylazo)-1,8-dihydroxynapthalene-3,6-disulfonic acid.
نویسندگان
چکیده
منابع مشابه
The nonexistence of distance-regular graphs with intersection arrays {27, 20, 10;1, 2, 18} and {36, 28, 4;1, 2, 24}
Locally, a distance-regular graph with ‘μ = 2’ carries the structure of a partial linear space. Using this, we show that there are no distanceregular graphs with intersection array {27, 20, 10; 1, 2, 18} or {36, 28, 4; 1, 2, 24} (on, respectively, 448 or 625 vertices).
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The title compound, C(7)H(4)ClFO(2), is a twofold halogenated derivative of benzoic acid. The C-C-C angles within the aromatic moiety cover a range 116.11 (14)-123.96 (15)°, with the maximum and the minimum value next to each other. In the crystal, O-H⋯O hydrogen bonds form carb-oxy-lic acid dimers, which are further connected by C-H⋯F contacts into undulating sheets perpendicular to the a axis.
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The asymmetric unit of the title compound, C(7)H(5)ClO(3), contains two mol-ecules; both feature an intra-molecular O-H⋯O hydrogen bond, which generates an S(6) ring. In the crystal, both mol-ecules form inversion dimers linked by pairs of O-H⋯O hydrogen bonds with R(2) (2)(8) ring motifs. The dimers are inter-linked by C-H⋯O inter-actions.
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In the mol-ecule of the title compound, C(13)H(9)ClINO(4)S, the coordination around the S atom is distorted tetra-hedral. The aromatic rings are oriented at a dihedral angle of 74.46 (9)°. Intra-molecular C-H⋯O hydrogen bonds result in the formation of two five- and one six-membered rings, which adopt planar, envelope and twisted conformations, respectively. In the crystal structure, inter-mole...
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This research evaluates the efficiency of nanosized ZnO in the catalytic ozonation of 4-chloro-2-nitrophenol and determines the effect of pH on heterogeneous catalytic ozonation. The combined use of ozone and ZnO catalyst leads to conversion of 98% 4-chloro-2-nitrophenol during 5 min. In addition, it was found that in ZnO catalytic ozonation, the degradation efficiency of 4-chloro-2-nitrophenol...
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ژورنال
عنوان ژورنال: BUNSEKI KAGAKU
سال: 1987
ISSN: 0525-1931
DOI: 10.2116/bunsekikagaku.36.2_129