Syntheses, crystal structures, and magnetic properties of 1-D coordination polymers

Abstract

Three coordination polymers of Robson-type macrocycles, {[Cu₄L¹(4,4′-bipy)₂]·4ClO₄·H₂O}_∞ (1), {[Cu₄L²(4,4′-bipy)₄]·2CH₃CN·4ClO₄·2H₂O}_∞ (2), and {[Zn₂L²(4,4′-bipy)₂]·(ClO₄)₂}_∞ (3) (where H₂L¹ and H₂L² are the [2 + 2] condensation products of 1,3-diaminopropane with 2,6-diformyl-4-methylphenol and 2,6-diformyl-4-fluorophenol, respectively), have been synthesized and characterized. Magnetic susceptibility was measured for 1 and 2 from 2 to 300 K. The optimized magnetic data were J = –368.5 cm⁻¹, J′ = 40.5 cm⁻¹ with R = 1.69 × 10⁻⁶ for 1 and J = –291.22 cm⁻¹, J′ = 83.74 cm⁻¹, ρ = 0.00168 with R = 1.8 × 10⁻¹¹ for 2, respectively. The data reveal strong antiferromagnetic interactions between two Cu(II) ions in the macrocyclic unit and ferromagnetic interaction between the Cu(II) ions in two adjacent macrocyclic units for 1 and 2.

Graphical Abstract

Three novel coordination polymers of Robson-type dinuclear macrocyclic complexes, bridged by 4,4′-bipyridine, were synthesized and fully characterized, Magnetic data reveal that there are strong antiferromagnetic between two Cu(II) ions in the macrocyclic unit and ferromagnetic interaction between the Cu(II) ions in two adjacent macrocyclic units for complexes 1 and 2.

Keywords:

• Robson-type macrocyclic complex
• Coordination polymer
• Magnetism