ABSTRACT:

Research Article

Studies of Binary Complexes of Tripodal Ligand cis,cis-1,3,5-tris(methylamino)cyclohexane with Cr(III) and Fe(III)

S Esakki Muthu, Suban K. Sahoo, Minati Baral and B. K. Kanungo*

Department of Chemistry Sant Harchand Singh Longowal Central Institute of Engineering & Technology Longowal – 148106, India.

The formation of binary complexes of Cr(III) and Fe(III) with a tripodal ligand cis,cis-1,3,5-tris(methylamino)cyclohexane (tmach) (L) has been investigated in solution. The overall stability constants of tmach with Cr(III) and Fe(III) were determined by potentiometric method at an ionic strength of 0.1M NaClO₄ at 25±1°C in aqueous medium. The formation of species like MLH₂⁵⁺, MLH⁴⁺, ML³⁺, ML(OH)²⁺ and ML(OH)₃ were observed. Fe(III) was found to form more stable complexes than Cr(III). Molecular mechanics calculations were performed to explain the mode of coordination in solution.