The cobalt(II) salt of the azo dye Orange G

Alan R. Kennedy, Scott C. McKellar, Maurice O. Okoth

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Crystallizing the cobalt(II) salt of the azo dye Orange G from water was found to give the solvent-separated ion-pair species hexaaquacobalt(II) 7-oxo-8-(2-phenylhydrazin-1-ylidene)-7,8-dihydronaphthalene-1,3-disulfonate tetrahydrate, [Co(H2O)(6)](C16H10N2O7S2)center dot 4H(2)O. The asymmetric unit of the cobalt(II) salt contains three independent octahedral [Co(OH2)(6)](2+) cations, three azo anions, all with similar configurations, and 12 uncoordinated water molecules. The structure is closely related to that of one of the known magnesium analogues. Both structures have Z' = 3, feature nearly planar azo anions [maximum displacement of azo-N atoms from the plane of the phenyl ring = 0.058 (7) angstrom] in their hydrazone tautomeric form, form layer structures with hydrophilic and hydrophobic layers alternating along the b-axis direction, and are stabilized by an extensive network of hydrogen bonds.

LanguageEnglish
Pagesm1330-m1331
Number of pages23
JournalActa Crystallographica Section E: Structure Reports
Volume66
DOIs
Publication statusPublished - Oct 2010

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Azo Compounds
Azo dyes
Cobalt
Anions
Negative ions
cobalt
Salts
dyes
anions
salts
Hydrazones
hydrazones
Water
Magnesium
water
Cations
magnesium
Hydrogen bonds
Positive ions
Ions

Keywords

  • sulfonated monoazo dyes
  • motifs
  • cobalt salt

Cite this

Kennedy, Alan R. ; McKellar, Scott C. ; Okoth, Maurice O. / The cobalt(II) salt of the azo dye Orange G. In: Acta Crystallographica Section E: Structure Reports. 2010 ; Vol. 66. pp. m1330-m1331.
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The cobalt(II) salt of the azo dye Orange G. / Kennedy, Alan R.; McKellar, Scott C.; Okoth, Maurice O.

In: Acta Crystallographica Section E: Structure Reports, Vol. 66, 10.2010, p. m1330-m1331.

Research output: Contribution to journalArticle

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AB - Crystallizing the cobalt(II) salt of the azo dye Orange G from water was found to give the solvent-separated ion-pair species hexaaquacobalt(II) 7-oxo-8-(2-phenylhydrazin-1-ylidene)-7,8-dihydronaphthalene-1,3-disulfonate tetrahydrate, [Co(H2O)(6)](C16H10N2O7S2)center dot 4H(2)O. The asymmetric unit of the cobalt(II) salt contains three independent octahedral [Co(OH2)(6)](2+) cations, three azo anions, all with similar configurations, and 12 uncoordinated water molecules. The structure is closely related to that of one of the known magnesium analogues. Both structures have Z' = 3, feature nearly planar azo anions [maximum displacement of azo-N atoms from the plane of the phenyl ring = 0.058 (7) angstrom] in their hydrazone tautomeric form, form layer structures with hydrophilic and hydrophobic layers alternating along the b-axis direction, and are stabilized by an extensive network of hydrogen bonds.

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