The Magnetic Properties of d8 -d10 β-Diketonate Supramolecular Metal Complexes and Their Macromolecular Polymers

• Published in: Journal of macromolecular science. Physics Vol. 52; no. 2; pp. 344 - 354
• Main Authors: Al-Anber, Mohammed A., Lataifeh, Mahdi, Daoud, Haneen
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.02.2013; Taylor & Francis
• Subjects: Applied sciences; Exact sciences and technology; Inorganic and organomineral polymers; macromolecular polymers; magnetic properties; metal acetates; paramagnetic transition metal; Physicochemistry of polymers; Properties and characterization; macromolecular polymers; Zinc II Complexes; Polychelate; Fluorine containing polymer; Organometallic polymer; Experimental study; paramagnetic transition metal; Magnetization curve; Magnetic material; Copper II Complexes; metal acetates; Magnetic properties; Nickel II Complexes
• ISSN: 0022-2348; 1525-609X
• DOI: 10.1080/00222348.2012.701554

The field-dependent magnetization M(H) of [M(tba) 2 ·nH 2 O] supramolecular metal complexes and their [M(tba) 2 (4,4′-bipy)] n (M ˭ Ni(II), Cu(II), and Zn(II); tba = deprotenated 3-benzoyl-1.1.1-triflouroacetone (H-tba); 4,4′-bipy = 4,4′-bipyridine) macromolecular coordination polymers have been investigated by vibrating sample magnetometer at ambient temperature (ca. 23°C). The external magnetic field H(O e ) was applied in the range of 0−100 O e . The magnetization M(emu/g) was equal almost to zero without an applied magnetic field (H(O e )) for each metal ion. The increase or decrease in the slope of the magnetization curve (M(H)) with the H(O e ) was nearly linear as is usually true for paramagnetic and diamagnetic materials. The coordination of 3-benzoyl-1.1.1-triflouroacetone (H-tba) with Ni(II) and Cu(II) metal ions produces [M(tba) 2 (H 2 O) 2 ] (M ˭ Ni(II) and Cu(II)) complexes that have paramagnetic properties less than their metal acetates. The slope of the M(H) curve for the [Ni(tba) 2 (H 2 O) 2 ] metal complex was found to be higher than for the [Cu(tba) 2 ] complex. The diamagnetic behavior of [Zn(tba) 2 (H 2 O) 2 ] was not highly affected by the H-tba ligand. The extending of the paramagnetic metal complexes using 4,4′-bipyridine produces diamagnetic [Ni(tba) 2 (4,4′-bipy)] n and [Cu(tba) 2 (4,4′-bipy)] n macromolecular polymers possessing a negative magnetization (M(emu/g)) values. It was found that the [Zn(tba) 2 (4,4′-bipy)] n polymer has diamagnetic properties higher than the [Zn(tba) 2 (H 2 O) 2 ] complex.