Synthesis and Characterization of Novel Selenium Bearing 24‐ and 28‐Membered Macrocyclic Schiff Bases and Their Reactivity with Hg (II) Ion

Abstract The present study reports the synthesis of novel selenium containing 24 ( 1 )‐ and 28 ( 2 )‐membered macrocyclic Schiff base ligands and their reactivity with Hg(II) metal ion to form complex 3 and 4 , respectively. The synthesis of the ligands are carried out by a simple condensation of 2,6‐dibenzoyl‐4‐methylphenol and bis(aminoethyl/propyl)selenides in [2+2] dipodal manner in dry acetonitrile solvent under inert atmosphere. Furthermore, the reaction between the 24‐ and 28‐membered selenium containing ligands and Hg(II) metal ion are carried out in dry methanol in argon atmosphere. Following the complexation of both the ligands, 1 (C 50 H 48 O 2 N 4 Se 2 ) and 2 (C 54 H 56 O 2 N 4 Se 2 ) when reacted with HgBr 2 yields monometallic complexes 3 and 4 with molecular composition of C 50 H 50 O 3 N 4 Se 2 HgBr 2 and C 54 H 58 O 3 N 4 Se 2 HgBr 2 , respectively, as calculated via elemental analysis and mass spectrometry. Moreover, the synthesized compounds are also characterized by various physicochemical techniques to determine the structure and reactivity, which includes UV–vis, FT‐IR, multinuclear ( 1 H and 77 Se) NMR, and cyclic voltammetry.