Using vibrational and electronic spectroscopies to investigate different complexes in the formamide/nickel chloride system

Synthesis, characterization, in vitro bioactivity and antimicrobial activity of magnesium and nickel doped silicate hydroxyapatite

“…Ni 2 þ ions have d 8 electronic configuration, the ground state ( 3 A 2g ) of the Ni 2 þ ion in an octahedral field will have three major spin-allowed d-d transitions shown in (Fig. 5) [50,51]. The peak at 1197 nm was attributed to the 3 A 2g (F)-3 T 2g (F) in the infra-red region, whereas the peak at 743 nm and shoulder at around 666 nm were due to the 3 A 2g (F)-3 T 1g (F) transition, this transition could be attributed to Spin-orbit coupling that mixes the 3 T 1g (F) and 1 E g states [52,53].…”

A purely vibrational insight on the tetragonal distortion of [Cu(DMF)6]2+

“…More recently, we have reported that the shifts observed for the m CO and m CN modes of simple protic amides may be used to indicate what sites are involved in the coordination to the metal [6][7][8][9][10]. So far, the shifts have confirmed the catalytic activity of some metal ions (Zn, Ni and Cu(II)) and may be useful in the prediction of others toward hydrolysis reactions.…”

“…Vibrational spectroscopy has been employed by our research group for a long time aiming at describing the solvation structures in metal-amide interaction processes [1][2][3][4][5][6][7][8][9][10]. More recently, we have reported that the shifts observed for the m CO and m CN modes of simple protic amides may be used to indicate what sites are involved in the coordination to the metal [6][7][8][9][10].…”

New Vibrational Information on Simple Amides in Solution: A Case Study on GaCl3-Formamide Complexes

“…Both Raman and IR spectra were obtained with 4 cm − 1 resolution at the temperature of 20 ± 2°C. OMNIC 7.3 software was employed for the spectral data treatment, and details can be found in our previous works [6][7][8][10][11][12][13][14][15].…”

“…On the contrary, FeCl 3 -FA solutions show the arising of the 332 cm − 1 band, which is due to A 1 vibration of [FeCl 4 ] − [8]. In common, the addition of Al 3+ and Fe 3+ chlorides to the FA solvent causes upshifts of both ] CO and ] CN modes, instead of the behavior typically observed as simple amides coordinate other ions and produce the ] CO downshift and the ] CN upshift [8][9][10][11][12][13][14][15]. So far, we have observed that the two spectral patterns of FA show good relationship with the electrostatic potential of coordinated ions, ϕ, and with the catalytic activity of metals toward amide bond cleavage reactions [15].…”