Bis(acesulfamato)tetraaquacobalt(II)

Abstract

The crystal structure of the first acesulfame-metal complex, namely tetraaquabis[6-methyl-1,2,3-oxathiazin-4(3H)-onato 2,2-dioxide-kappaN]cobalt(II), [Co(C4H4NO4S)2(H2O)4], is reported. The Co(II) ion resides on a twofold axis and is coordinated by four aqua ligands defining the basal plane and by two monodentate acesulfamate ligands, via their ring N atoms, in the axial positions. Two intra- and three intermolecular hydrogen-bonding interactions stabilize the crystal structure and form an infinite three-dimensional lattice.

Synthesis, Structural Characterization and Chromotropism of a Ni(II) and a Co(II) Compound with Acesulfamate as a Ligand

“…The carbonyl stretching band of potassium acesulfame observed at 1661 cm )1 was shifted to 1656 and 1653 cm )1 for bis(acesulfamato-N)tetraaquacobalt(II) and bis(acesulfamato-O)tetraaquanickel(II) respectively, indicating that acesulfame coordinates to metal ions through carbonyl oxygen (or imino nitrogen). The observed red-shifts for the carbonyl stretching band in the acesulfame-metal complexes studied here are in good agreement with the observed carbonyl (C=O) bond lengths: 1.239, 1.252 and 1.257 Å for potassium acesulfamate [23], bis(acesulfamato-N)tetraaquacobalt(II) [3] and bis(acesulfamato-O)tetraaquanickel(II), respectively. The observed strong bands at 1318 and 1195 for bis(acesulfamato-N)tetraaquacobalt(II); 1319 and 1194 for bis(acesulfamato-O)tetraaquanickel(II) respectively, were assigned to the asymmetric and symmetric stretching bands of the sulfonyl group, respectively [24].…”

“…The bond lengths and angles of the acesulfamate ligands are similar to the corresponding values of the cobalt(II) acesulfamato complex [Co(acs) 2 (H 2 O) 4 ] [3], while there are some differences from the analogous potassium salt [23]. The most pronounced of these is the S1-N1-C1 bond angle, reduced to 118.66(10)°in [Ni(acs) 2 (H 2 O) 4 ] from the corresponding value of 122.9(2)°in the potassium salt.…”

“…Despite its potential for diversity in coordination, little has been reported on the coordination behavior of acesulfamate as a ligand. Only a few papers have reported recently on the synthesis, spectroscopic and structural properties of acesulfamate-metal complexes [3][4][5].…”

Synthesis, structural and spectroscopic characterization of thallium(I) acesulfamate

“…The study of this ligand constituted, during many years, one of the main research activities of Gligor Jovanovski, which can be considered as a central figure in the development of this peculiar field of chemistry and coordination chemistry. Similar to saccharinate, the acesulfamate anion presents different potential coordination sites: the iminic nitrogen, the carbonylic oxygen and the two sulfonyl oxygen atoms, and it can act as a monodentate, bidentate or bridging ligand, in the same way as saccharinate [6], as demonstrated by a number of acesulfamato metal complexes reported during the last years [7][8][9][10][11][12][13][14].…”

Mixed ligand complexes of acesulfame/nicotinamide with earth alkaline metal cations Mg(II), Ca(II), Ba(II) and Sr(II): synthesis and characterization

“…Octahedral geometry was achieved by the two neutral 2-aminopyrimidine ligand behaving as monodentate ligand. [Ni (dmen) 2 (H 2 O) 2 ](acs) 2 complex was the first complex within which acesulfamate anion acts as charge balancer [10]. At a comprehensive study performed for acesulfame metal complexes, details about synthesis, structure and properties of complexes with the general formula of [M(acs) 2 4 ] complex, it was observed that there is intermolecular interaction (hydrogen bonding) between sulphonyl oxygen atoms of acesulfamato ligand and hydrogen atoms of aqua ligands and also both intermolecular and intramolecular interaction (hydrogen bonding) between carbonyl oxygen atoms of acesulfamato and hydrogen atoms of aqua ligands.…”