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2,3-Dihydroxybenzene, coordination

Carbon dioxide has been reduced to methanol with the Everitt s salt (ES)-mediated electrode in the presence of l,2-dihydroxybenzene-3,5-disul-phonato(iron) ferrate(III) complex (Scheme 103) [408, 409]. The reduction proceeds as follows a weak coordination bond is first formed between the central metal of ES and ethanol, then the subsequent insertion of CO2 onto... [Pg.554]

The existence of a wide variety of zirconium(IV)-aminopolycarboxylate complexes in solution was established by the potentiometric titration studies of Intorre and Martell.675-677 This work and related solution studies have been reviewed by Larsen.5 Zirconium(IV) forms 1 1 and 1 2 complexes with tetradentate aminopolycarboxylates, 1 1 complexes with hexadentate and octadentate aminopolycarboxylates, and mixed ligand complexes with aminopolycarboxylates and various bidentate ligands, for example 1 1 1 Zr-edta-Tiron and 1 1 2 Zr—nta-Tiron complexes (Tiron = l,2-dihydroxybenzene-3,5-disulfonate). The stoichiometries of these complexes are consistent with the tendency of zirconium to achieve a coordination number of eight. [Pg.437]

The Sb atom has (/-tbp geometry as in a number of other Sb111 species. This coordination is also found68 in the complex K[As(C6H402)2] derived from pyrocatechol (o-dihydroxybenzene). [Pg.393]

Intorre and Martell (237) have also studied the formation of mixed chelate species in which the zirconium 1 1 complex with the hexa-dentate chelating ligands, ethylenediaminetetraacetic acid, iV-hydroxy-ethylethylenediaminetriacetic acid, and m7 s-cyclohexanediaminetetra-acetic acid, are shown to take up one mole of the bidentate ligands, l,2-dihydroxybenzene-3,5-disulfonate l,8-dihydroxynaphthalene-3,6-disulfonate 8-hydroxyquinoline-5-sulfonate, and acetylacetone (except ZrHEDTA), to form 8-coordinate 1 1 1 species. At least for the zir-conium-EDTA-l,2-dihydroxybenzene-3,5-disulfonate species, there is evidence for dimerization (230). Additionally, the Zr EDTA complex reacts with one mole of the bidentate ligands, 5-sulfosalicyclic acid, alizarin sulfonate, citric acid, and lactic acid to form 1 1 1 complexes tartaric acid and pyrophosphate ions form complexes which could not be identified. The zirconium-nitriloacetic acid complex in the presence of two moles of oxalic acid or l,2-dihydroxybenzene-3,5-sulfonate also forms 1 1 1 complexes in solution. [Pg.52]

A few [VO(OMe)(/3-diketonato)]2 and [VO(L)]2 complexes (L = polydentate O-coordinating ligands) also have a high catalytic activity for the oxygenation of catechols (namely 3,5-di-t-butyl-l,2-dihydroxybenzene) and this reaction was considered similar to the one catalyzed by pyrocatechase. [Pg.2349]

A similar situation can occm for hydroquinone (1,4-dihydroxybenzene). However, in this case the ligand can coordinate to two metal centres In one study this ability was utilized to produce interesting covalent three-dimensional networks." ... [Pg.449]

Chart 3. Ligands used for complex formation with cerium(IV) in model studies of plutonium(IV) coordination chemistry (a) 1,2-dihydroxybenzene (catechol) (b) 3,5-disulfonate-1,2-dihydroxybenzene (tiron) (c) l-methyl-3-hydroxy-2(l//)-pyridinone (Me-3,2-HOPO) (d) PR-Me-3,2-HOPO (e) 5LO-Me-3,2-HOPO (f) 5LI-Me-3,2-HOPO (g) A,A -diethyl-2,3-dihydroxyterephthalamide (H2ETAM). The nomenclature of the HOPO ligands is that of Raymond and coworkers (Xu et al., 2000). [Pg.375]


See other pages where 2,3-Dihydroxybenzene, coordination is mentioned: [Pg.213]    [Pg.609]    [Pg.557]    [Pg.248]    [Pg.38]    [Pg.54]    [Pg.780]    [Pg.397]    [Pg.174]    [Pg.214]    [Pg.780]    [Pg.2396]    [Pg.4234]    [Pg.312]    [Pg.213]    [Pg.64]    [Pg.132]   
See also in sourсe #XX -- [ Pg.192 ]




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DIHYDROXYBENZENE

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