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Title: Synthesis, characterization and ferromagnetic behavior of [Co<sup>III</sup>(en)<sub>2</sub>(RC<sub>6</sub>H<sub>4</sub>NH<sub>2</sub>)I]I<sub>2</sub>.H<sub>2</sub>O complexes
Authors: Anbalagan, K
Ganeshraja, A S
Kandasamy, S
Keywords: Coordination chemistry
Aryl amines
Issue Date: Feb-2010
Publisher: CSIR
Series/Report no.: Int. Cl.<sup>9</sup> C07F15/06
Abstract: Mixed ligand cobalt(III) complexes containing aryl amine (RC<sub>6</sub>H<sub>4</sub>NH<sub>2</sub>) ligand have been synthesized using a modified route developed in this study. A wide range of complexes, [Co<sup>III</sup>(en)<sub>2</sub>(L)I]I<sub>2</sub>.H<sub>2</sub>O, (where L = RC<sub>6</sub>H<sub>4</sub>NH<sub>2</sub>; R = <i style="">m</i>-OMe, <i style="">p</i>-F, H, <i style="">m</i>-Me, <i style="">p</i>-Me, <i style="">p</i>-OEt and <i style="">p</i>-OMe) show promising reactivities and physical properties due to the presence of electron donor/acceptor groups in the aryl ligand. The complexes have been characterized by elemental analysis, FT-IR, UV-vis and powder X-ray diffraction patterns. FT-IR ν(M-X) and UV-vis spectral data are compatible with <i style="">trans-</i>form of the complexes. Magnetic studies yield magnetic remanence <i style="">M<sub>r</sub></i> = 7.071 ´ 10<sup>-3</sup> – 3.069 ´ 10<sup>-5</sup> emu/g and intrinsic coercivity, -<i style="">H<sub>ci</sub></i> = 141-1156 Oe. Linear regression plot of <i style="">M<sub>r</sub></i> versus σ yields negative slope, implying that electron withdrawing group in RC<sub>6</sub>H<sub>4</sub>NH<sub>2 </sub>(σ > 0) enhances ferromagnetic character while the electron donating groups (σ < 0) reduce ferromagnetism. The study provides evidence that substitution at the aryl ligand, remote from the Co(III) center, effectively displays and imparts characteristic ferromagnetic properties. Cobalt(III) complexes containing RC<sub>6</sub>H<sub>4</sub>NH<sub>2 </sub>ligand illustrate a simple molecular fabrication technique, which can be suitably integrated into a system, to have some control on the behavior of metal complexes. A modified ferromagnetic character due to charge build up on the metal centre by ligating nitrogen atom, which in turn makes the molecule into a centre of systematic variation in magnetization, has been observed.
Description: 171-175
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(02) [February 2010]

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