Structures of divalent transition metal salts of 4-aminonaphthalene-1- sulfonate: Unexpected variations in layering pattern

Jill E. Morris, Philip J. Squattrito, Kristin Kirschbaum, A. Alan Pinkerton

Research output: Contribution to journalArticlepeer-review

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Salts of 4-aminonaphthalene-1-sulfonate with divalent Mg, Mn, Co, and Ni cations have been crystallized and their structures determined by single crystal X-ray methods. The Mg and Mn salts are isostructural. Crystal data for hexa-aquamagnesium(II) 4-aminonaphthalene-1-sulfonate dihydrate, [Mg(H 2O)6](H2NC10H6SO 3)2 · 2H2O: monoclinic, P2 1/c, Z = 2, a = 8.622(3), b = 7.043(3), c = 23.178(3) Å, β= 93.78(2)°, V = 1404.3(7) Å3; hexa-aquamanganese(II) 4-aminonaphthalene-1-sulfonate dihydrate, [Mn(H2O) 6](H2NC10H6SO3) 2 · 2H2O: monoclinic, P21/c, Z = 2, a = 8.652(3), b = 7.031(4), c = 23.402(2) Å, β= 93.09(2)°, V = 1421.5(9) Å3. The structures are composed of alternating layers of octahedral metal-aqua complexes and sulfonate anions linked by an extensive network of hydrogen bonds. The extra water molecules of crystallization are located in the hexa-aquametal cation layers. The repeat unit along the c axis is a double layer. The Co and Ni compounds are isostructural with each other, but compared to the Mg and Mn compounds, have a strikingly different structure. Crystal data for hexa-aquacobalt(II) 4-aminonaphthalene-1-sulfonate trihydrate, [Co(H2O) 6](H2NC10H6SO3) 2 · 3H2O: orthorhombic, Pbca, Z = 8, a = 8.518(1), b = 14.327(2), c = 45.367(6) Å, V = 5536(1) A3; hexa-aquanickel(II) 4-aminonaphthalene-1-sulfonate trihydrate, [Ni(H 2O)6](H2NC10H6SO 3)2 · 3H2O: orthorhombic, Pbca, Z = 8, a = 8.4976(6), b = 14.288(1), c = 45.076(3) Å, V = 5472.9(7) Å 3. These structures also contain layers of octahedral hexa-aquametal complexes and additional water molecules of crystallization sandwiched by layers of sulfonate anions, however the stacking pattern is more complex with a quadruple layer repeat unit and two different types of anion layers.

Original languageEnglish
Pages (from-to)307-321
Number of pages15
JournalJournal of Chemical Crystallography
Issue number4
StatePublished - Apr 2003


  • Cobalt complexes
  • Layered structures
  • Magnesium complexes
  • Manganese complexes
  • Nickel complexes
  • Sulfonate salts


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