Synthesis and characterization of 3d metal complexes based on 1-(4-Nitrophenyl)imidazole

Abstract

Synthesis and characterization of complexes with formulations [M(nopi)₂Cl₂] (M = Co, 1; Ni, 3; Cu, 6; Zn, 9), [M(nopi)₆](X)₂ (X^- = NO₃^-, M = Co, 2; Ni, 4; Zn, 10; X^- = ClO₄^-, M = Ni, 5; Cu, 8; Zn, 11) and [Cu(nopi)₄(NO₃)₂] (7) imparting 1-(4-nitrophenyl)imidazole (nopi) have been described. The complexes have been characterized by elemental analyses and spectral (IR, ¹H NMR, electronic absorption and emission) studies. Molecular structures of 7 and 9 have been determined crystallographically. Weak interaction studies on 7 and 9 revealed the presence of various interesting motifs resulting from C–H···N, C–H···Cl, and π–π stacking interactions. Temperature-dependent (313–373 K) pressed pellet conductivity and activation energy calculations from the plot of ln σ vs. 1/T suggested semiconducting behavior of 2, 6, and 7.