The Electronic Transition Behavior Cr (III), Fe (III), Fe (II) and Ni (II), Transition Metal Cations In Ammonium Alum-Urea Room Temperature Ionic Liquid

Abstract

Some transition metal cations, Cr (III), Fe (III), Fe (II) and Ni (II), were soluble in the new alum/urea ionic liquid and found to coordinate to it with weak coordination bond. This was reflected by the change of strength of the electronic spectra of the cations or the nature of these spectra as with Fe (II) when it showed high spin and low spin with nitrite and thiocyanate ions. It was also observed that water molecules of the solid composition of ionic liquid were not free in ionic liquid particularly when metal cations electronic behavior were compared to those in aqueous solution. Basic species of ionic liquid were suggested to have weak ionic strength.

DSC and TGA Measurements of Room Temperature Ionic Liquids (RTILs) Containing Ammonium Alum or Aluminum Nitrate with Amide Compounds

“…But the absence of such evaporation indicated a strong bond of water molecules with the ionic species of ionic liquids as weight loss was only recorded around 203°C the lowest onset of decomposition of studied ionic liquids. Such coordination bond was also concluded in other work suggested from UV spectroscopic study of USIL [11]. The ionic liquids stability related to their decomposition temperatures could be arranged in the following order USIL > AN2IL > UNIL >ANIL > ASIL.…”

Photochemical Study of Hydrated Ammonium Aluminum Sulfate-Urea Ionic Liquid by FT-IR Spectroscopy

“…The most sensitive spectral the region of the urea structural components is the vibrational band 1600-1700 cm −1 ), which is almost consequent quite to the C=O stretch vibration, 3300-3100cm -1 ) the N-H stretching and the C-N stretching vibration 1480-1575 cm -1 ) [1]. While the vibrational bands of N-H 3460-3371cm -1 ), C=O 1647cm -1 ) and C-N 1462cm -1 ) in hydrated ammonium aluminum sulfate-urea ionic liquid [2]. Green chemistry of ionic liquids are salts cation and anion part .These liquids exhibit very low vapor pressures, low melting points, thermal stabilities, environmentally friendly and their utility as solvents [3].…”

Electrodeposition of Antimony from Hydrated Ammonium Aluminum Sulfate-Urea Room Temperature Ionic Liquid

“…Ammonium alum and urea in mole ratio of (1:5) were milled separately, mixed and heated gradually to 85°C with stirring until melted together producing colorless liquid [10]. The resulted melt was gradually cooled to room temperature and remained liquid and stored in sealed container.…”

“…These are interested ionic liquids because this type showed the characterization of ionic liquids and also containing water molecules which was reported to exists in the liquid coordinated to the ionic species of ionic liquid and not in the free state [10]. This is an interesting characterization as added water to anhydrous ionic liquid of NiCl 2 :urea showed to influence the nature of deposited nickel [11].…”