Acta Crystallographica Section C

Crystal Structure Communications

Volume 57, Part 12 (December 2001)

Acta Cryst. (2001). C57, 1381-1384 [doi:10.1107/S0108270101015049]

Bis(triethanolamine)cadmium(II) and -mercury(II) saccharinates: seven-coordinate complexes containing both tri- and tetradentate triethanolamine ligands

O. Andac, Y. Topcu, V. T. Yilmaz and K. Guven

Abstract: The structures of the title triethanolamine (tea) complexes of Cd^II and Hg^II saccharinates, bis(triethanolamine)- [bold kappa] ³O,N,O';⁴O,N,O',O''-cadmium(II) 1,2-benzisothiazol-3(2H)-onate 1,1-dioxide, [Cd(C₆H₁₅NO₃)₂](C₇H₄NO₃S)₂, (I), and bis(triethanolamine)-³O,N,O';⁴O,N,O',O''-mercury(II) 1,2-benzisothiazol-3(2H)-onate 1,1-dioxide, [Hg(C₆H₁₅NO₃)₂](C₇H₄NO₃S)₂, (II), or [M(tea)₂](sac)₂, where M is Cd^II or Hg^II and sac is the saccharinate anion, reveal seven-coordinate metal ions in both complexes. Both complex cations, [M(tea)₂]²⁺, adopt a monocapped trigonal prism geometry in which the two tea ligands exhibit different coordination modes to achieve seven-coordination. One tea ligand acts as a tetradentate ligand using all its donor atoms, while the other behaves as a tridentate O,N,O'-donor ligand, with one of its ethanol groups remaining uncoordinated. The H atoms of the free and coordinated hydroxyl groups of the tea ligands are involved in hydrogen bonding with the amine N atom, and with the carbonyl and sulfonyl O atoms of neighbouring sac ions, forming an infinite three-dimensional network. A weak [bold pi] - interaction between the phenyl rings of the sac ions also occurs.

Formula: [Cd(C₆H₁₅NO₃)₂](C₇H₄NO₃S)₂ and [Hg(C₆H₁₅NO₃)₂](C₇H₄NO₃S)₂

Online 6 December 2001


	Structure factor file (CIF format) (547.8 kbytes) Contains datablock I

	Structure factor file (CIF format) (542.3 kbytes) Contains datablock II

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