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

Abstract

The structures of the title triethanolamine (tea) complexes of Cd(II) and Hg(II) saccharinates, bis(triethanolamine)-kappa3O,N,O';kappa4O,N,O',O"-cadmium(II) 1,2-benzisothiazol-3(2H)-onate 1,1-dioxide, [Cd(C6H15NO3)2](C7H4NO3S)2, (I), and bis(triethanolamine)-kappa3O,N,O';kappa4O,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 pi-pi interaction between the phenyl rings of the sac ions also occurs.

Mixed-ligand complexes of Zn(II), Cd(II) and Cu(II) with triethanolamine and p-nitrobenzoic acid: Syntheses and crystal structures

“…In the homoligand TEA complexes of Cd, only the coordination of two ligand molecules is observed, where all 4 atoms of both TEA molecules participate in octa-coordination [12] or hepta-coordination takes place due to one hydroxyl oxygen atom of one ligand molecule remaining uncoordinated [11,25]. In the only structurally characterized mixed ligand complex of Cd all 4 donor atoms of the TEA molecule are involved in coordination [26].…”

Bis(N,N′-bis(2-hydroxyethyl)ethylenediamine)nickel(II) saccharinate: synthesis, characterization and crystal structure

“…The intensity data for [Ni(bishydeten) 2 ](sac) 2 were collected using a Rigaku R-AXIS RAPID-S diffractometer using Mo K α radiation (0.71073 Å). The structure was solved by direct methods and refined against |F| 2 with the SHELX-97 program [10].…”

“…Со помош на анализа на елементите, Фуриеова трансформна инфрацрвена спектроскопија и рендгенска дифракција на монокристал, е синтетизиран и карактеризиран нов никел(II)саха-ринатен (sac) комплекс кој содржи N,N′-бис (2-хидроксиетил)етилендиамин (bishydeten), [Ni(bishydeten) 2 ](sac) 2 . Изучуваното соединение се состои од катјони на [Ni(bishydeten) 2 ] 2+ и два сахаринатни (sac) анјони.…”

“…Изучуваното соединение се состои од катјони на [Ni(bishydeten) 2 ] 2+ и два сахаринатни (sac) анјони. Јонот на никел(II) во комплексниот катјон е координиран со два неутрални бидентатни лиганда, постигнувајќи координација на деформиран октаедар од типот NiN 4 …”

“…of bulky ligands such as triethanolamine [2][3][4][5], 2,6-pyridinedimethanol [6,7] usually prevents the coordination of sac to the metal ions, remaining it outside the coordination sphere as a counter-ion. As a continuation of our work on the synthesis and structures of metal complexes of sac, in this paper we report the synthesis, characterization and crystal structure of a new nickel(II) saccharinate complex with the N,N′-bis(2-hydroxyethyl)ethylenediamine(bishydeten) ligand, namely [Ni(bishydeten) 2 ](sac) 2 .…”