Interaction of nickel(II) and cobalt(II) salts with chitosan hydrochloride and acetate in aqueous solutions

Fundamental aspects of the complexation of cobalt(II) and nickel(II) ions with chitosan hydrochloride in water and chitosan in an aqueous solution of acetic acid were studied. The relation between the numbers of chitosan moles and metal ions involved in the interaction was found. The optimal conditions for synthesis of complexes were determined and their chemical composition and spectral properties were analyzed. The possible reaction mechanisms were discussed.     

Formation of Water Complexes with Organic Compounds in Solid Matter. IR Manifestation and DFT Study

In terms of FTIR study it was estimated that water forms the complexes with furan, thiophene, dichloromethane, tribromomethane in low temperature films at 90–150 K interval and with benzene in KBr matrix at ambient temperature. The mechanism of intermolecular interaction was simulated by ab initio calculation using DFT method. It was shown that complex formation occurs due to arising of hydrogen bond between hydronium ion of water cluster or single water molecule with organic components.     

Self-association of carbon tetrachloride in gas and condensed phase

The paper suggests the model of carbon tetrachloride self-association in gas and condensed phases, based on comparative analysis of IR findings for carbon-, silicon-, and germanium tetrachloride, obtained at different temperatures in gas, as well as in liquid, solid state, and noble gas solutions.

     

IR spectroscopic study of the complex formation between ammonia and water molecules in a KBr matrix

The formation of complexes of ammonia and water molecules in a potassium bromide matrix is studied by means of IR spectroscopy. Ammonia and water complexes of variable composition are stabilized in a solid matrix using different approaches to saturating KBr powder with the initial components. Proton transfer can occur, leading to the formation of ammonium salts.