Crystal Structure, Spectroscopic and Thermal Behaviour of Bis(saccharinato)tetrakis(pyridine)nickel(II) Dipyridine

Abstract

Abstract. The crystal structure of [Ni(sac) 2 py 4 ]´2 py (sac = saccharinate anion; py = pyridine) has been solved by single crystal X-ray diffractometry. lt crystallises in the orthorhombic space group Pcan with Z = 4. Coordination of the saccharinate anion to the metal centre occurs, in a rather unusual way, through the carbonylic oxygen atom. The IR and Raman spectra of the complex have been analyzed in detail and assigned on the basis of the structural data. The thermal behaviour was investigated by means of TG and DTA methods.

The saccharinate anion: a versatile and fascinating ligand in coordination chemistry

“…The first example of this form of interaction was reported for a V(II) complex, namely [V(sac) 2 (py) 4 ].2py 23 . Similar M-O bonds were found latter in the cases of [Ni(sac) 2 (py) 4 ] 24 and bis(saccharinate) tetra(isoquinoline)copper(II) 25 . Taking into account that, as mentioned above, the lighter divalent transition metal cations prefer M-N interactions, the appearance of M-O bonds in the mentioned complexes may probably be originated by steric effects.…”

Structural, Spectroscopic, and Thermal Behaviour of Bis-(thiosaccharinate)-aqua-cadmium(II)

“…Infrared and Raman data of the complex, compared with those of the free thiosaccharin molecule [33], are shown in Table 3. The proposed assignments are based on previous investigations on saccharinate complexes [7,8,10,12,34], free thiosaccharin [16,33], sodium and potassium thiosaccharinate [35], general literature data on thioamidates [36], and simple compounds containing SO and CS groups [37±39].…”

DFT study of electronic structure of saccharin, thiosaccharin, and their respective ions: Effects of metal coordination on thiosaccharinate electronic structure

“…1(A)] and its deprotonated form, the saccharinate anion [Fig. 1(B)], are good examples of cyclic amides, in previous articles we investigated their interactions with biologically relevant cations 2–8. In contrast to the well known and rich coordinating behavior of saccharin to first transition metal centers 2–12 and references cited therein], there is only one report about the isolation of coordination compounds of thiosaccharin with Co, Ni, and Zn 13.…”