Syntheses, spectroscopic, and magnetic properties of polystyrene-anchored coordination compounds of tridentate ONO donor Schiff base

Abstract

The crosslinked chloromethylated polystyrene (PSCH₂–Cl) reacts with the Schiff base, derived from condensation of PSCH₂–Cl with 3-formylsalicylic acid and salicylhydrazide to form a polystyrene-anchored Schiff base, PSCH₂–LH₃ (1). Compound 1 reacts with a number of metal ions to form polystyrene-anchored coordination compounds, PSCH₂–LHM · DMF (where M = Cu, Zn, Cd, UO₂, and MoO₂), PSCH₂–LHM′ · 3DMF (where M′ = Mn, Co, and Ni), PSCH₂–LHFeCl · 2DMF, and PSCH₂–LHZr(OH)₂ · 2DMF. The polystyrene-anchored coordination compounds have been characterized by elemental analyses, spectra (infrared, reflectance, and electron spin resonance) and magnetic susceptibility measurements. The polystyrene-anchored compounds are magnetically dilute. Shifts in band positions of the groups involved in coordination have been utilized to find tridentate ONO donor behavior of 1. The polystyrene-anchored Zn(II), Cd(II), Zr(IV), MoO₂(VI), and UO₂(VI) compounds are diamagnetic, while Mn(II), Co(II), Ni(II), Cu(II), and Fe(III) compounds are paramagnetic. The polystyrene-anchored Cu(II) compound is square planar; Zn(II) and Cd(II) compounds are tetrahedral; Co(II), Ni(II), Mn(II), Fe(III), MoO₂(VI), and UO₂(VI) compounds are octahedral; and Zr(IV) compound is pentagonal bipyramidal.

Keywords:

• Schiff base
• Coordination compound
• Paramagnetic
• Magnetically dilute
• ESR

Acknowledgments

The authors (P.K. Gupta, A. Kumar, and D. Dass) are grateful to the respective Directors of their Institute for providing financial assistance for this study.