Wydział Chemii

Rahman Bikas

Hassan Hosseini-Monfared

Maria Korabik

Marta S. Krawczyk

Tadeusz Lis

2014

Polyhedron

81

282-289

10.1016/j.poly.2014.06.024

Naukowa

Angielski

Artykuł

A new Cu^II 1D coordination polymer, {[Cu₂(L)(μ_1,5-dca)]₂·2(CH₃OH)}_n (1), containing the carbohydrazide based ligand (H₃L = bis-[(E)-N′-(2-hydroxybenzylidene)]carbohydrazide) and the dicyanamide (dca) bridging group has been synthesized and characterized by magnetic measurements, single crystal X-ray diffraction and other spectroscopic methods. X-ray analysis reveals that the ligand coordinates to the Cu^II ion as a hexadentate trinegative N₃O₃-donor ligand. Tetranuclear copper(II) units with double phenoxido bridges are formed, connected and extended by two μ_1,5-dca anions, forming a 1D polymeric structure. The magnetic measurements showed global antiferromagnetic interactions with two coupling constants between “outer” (J = −87 ± 2 cm⁻¹) and “inner” (J′ = −129 ± 2 cm⁻¹) copper pairs in tetranuclear units. The dicyanamide, adopting the end-to-end bridging mode (metal–metal separation of ca. 8.062(5) Å), has presented poor efficiency in mediating magnetic interactions.

hydrazone Schiff base, Cu(II) coordination polymer, Magnetic properties, crystal structure, phenoxido and dicyanamido bridges

http://dx.doi.org/10.1016/j.poly.2014.06.024

http://www.elsevier.com