Determination of the Stability Constants for some First Transition Elements Complexes with 3-(2- hydroxyl phenyl ) -2 – Pyrazoline In Aqueous Solution

Transition metal complexes Cr(III) , Fe(III) , Co(II) , Ni(II) & Cu(II) with 3-(2- hydroxy phenyl ) -2– pyrazoline have been prepared and characterized in aqueous solution. The complexes were characterized by infrared (IR), UV-visible & molar conductivity measurements. The bidentate ligand was bonded from one of the nitrogen atoms of pyrazolien & oxygen atom phenoxide group. The molecular structure for the complexes was proposed. The stability constants of these complexes were found by measuring electric molar conductivity in different concentrations was also found. The determined values of the prepared complexes increases according to the following sequence:Co+2 > Cu+2 > Ni+2 > Fe+3 > Cr+3This result agrees with the Irving Williamson series:-Mn+2 Zn+

Synthesis and Characterization of Some New Benzimidazole Derivatives

In this paper the new starting material 2-(5-chloro-1H-benzo[d]imidazole-2-yl) aniline (1) was synthesized by the condensation reaction of 4-chloro-o-phenylenediamine and anthranilic acid .The new Mannich base derivatives were synthesized using formaldehyde and different secondary amines to synthesize a new set of benzimidazole derivatives(2-5). Also, the new Schiff-base derivatives (6-10) were synthesized from the reaction of compound (1) with various aromatic aldehydes and the closure-ring was done successfully using mercapto acetic acid to get the new thiazolidine derivatives(11-12).These new compounds were characterized using some physical techniques like:FT-IR Spectra and 1HNMR Spectra

Synthesis and Characterization of Some New Benzimidazole Derivatives

In this paper the new starting material 2-(5-chloro-1H-benzo[d]imidazole-2-yl) aniline (1) was synthesized by the condensation reaction of 4-chloro-o-phenylenediamine and anthranilic acid .The new Mannich base derivatives were synthesized using formaldehyde and different secondary amines to synthesize a new set of benzimidazole derivatives(2-5). Also, the new Schiff-base derivatives (6-10) were synthesized from the reaction of compound (1) with various aromatic aldehydes and the closure-ring was done successfully using mercapto acetic acid to get the new thiazolidine derivatives(11-12).These new compounds were characterized using some physical techniques like:FT-IR Spectra and 1HNMR Spectra