Bis(triethanolamine)cadmium(II) and -mercury(II) saccharinates: seven-coordinate complexes containing both tri- and tetradentate triethanolamine ligands
O. Andac et al., Bis(triethanolamine)cadmium(II) and -mercury(II) saccharinates: seven-coordinate complexes containing both tri- and tetradentate triethanolamine ligands, ACT CRYST C, 57, 2001, pp. 1381-1384
The structures of the title triethanolamine (tea) complexes of Cd-II and Hg
-II saccharinates, bis(triethanolamine)-kappa O-3,N,O'; kappa O-4,N,O',O "
-cadmium(II) 1,2-benzisothiazol-3(2H)-onate 1,1-dioxide, [Cd(C6H15NO3)(2)](
C7H4NO3S)(2), (I), and bis(triethanolamine)-kappa O-3,N,O'; kappa O-4,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 a
nd sac is the saccharinate anion, reveal seven-coordinate metal ions in bot
h complexes. Both complex cations, [M(tea)(2)](2+), adopt a monocapped trig
onal prism geometry in which the two tea ligands exhibit different coordina
tion modes to achieve seven-coordination. One tea ligand acts as a tetraden
tate ligand using all its donor atoms, while the other behaves as a trident
ate O,N,O'-donor ligand, with one of its ethanol groups remaining uncoordin
ated. The H atoms of the free and coordinated hydroxyl groups of the tea li
gands 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 pi-pi interaction between the phenyl rin
gs of the sac ions also occurs.