Acta Crystallographica Section B

Structural Science

Volume 57, Part 4 (August 2001)

research papers

Acta Cryst. (2001). B57, 520-530 [ doi:10.1107/S010876810100862X ]

Solid-state structures of group 1 and group 2 metal 1,5-naphthalenedisulfonates: systematic investigation of lamellar three-dimensional networks constructed by metal arenedisulfonate

J. Cai, C.-H. Chen, C.-Z. Liao, X.-L. Feng and X.-M. Chen

Abstract: Seven Group 1 and Group 2 1,5-naphthalenedisulfonates (1,5-nds) have been synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectroscopy and thermal gravimetric analysis. For Group 1 metal complexes, with M = Li⁺ (1), Na⁺ (2) and K⁺ (3), all crystallize in the same space group (P2₁/c) with the same composition, [M₂(1,5-nds)(H₂O)₂]. They adopt similar three-dimensional packing arrangements with the metal-sulfonate inorganic layers pillared by naphthalene rings. However, the coordination behavior of three metal cations toward the SO group and water molecule are different, resulting in different architectures for the inorganic portion. For Group 2 complexes with M = Mg²⁺ (4), Ca²⁺ (5), Sr²⁺ (6) and Ba²⁺ (7), Mg²⁺ shows no direct coordination by the SO group while Ca²⁺ is coordinated by four SO groups and a two-dimensional network is formed. Complexes (6) and (7) are isostructural, adopting the same three-dimensional, inorganic-organic pillared framework as seen for (1)-(3). The coordination behavior of the metal cations in these structures neatly illustrates the increase in coordination strength with decreasing charge/radius ratio for Group 1 and Group 2 metal cations with large organic anions.

Keywords: coordination chemistry; groups 1 and 2 metal cations; 1,5-naphthalenedisulfonate; pillared/lamellar inorganic organic network.