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|Title:||Synthesis, characterization and ferromagnetic behavior of [CoIII(en)2(RC6H4NH2)I]I2.H2O complexes|
Ganeshraja, A S
|Keywords:||Coordination chemistry;Ferromagnetism;Cobalt;Aryl amines|
|IPC Code:||Int. Cl.9 C07F15/06|
|Abstract:||Mixed ligand cobalt(III) complexes containing aryl amine (RC6H4NH2) ligand have been synthesized using a modified route developed in this study. A wide range of complexes, [CoIII(en)2(L)I]I2.H2O, (where L = RC6H4NH2; R = m-OMe, p-F, H, m-Me, p-Me, p-OEt and p-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 trans-form of the complexes. Magnetic studies yield magnetic remanence Mr = 7.071 ´ 10-3 – 3.069 ´ 10-5 emu/g and intrinsic coercivity, -Hci = 141-1156 Oe. Linear regression plot of Mr versus σ yields negative slope, implying that electron withdrawing group in RC6H4NH2 (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 RC6H4NH2 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.|
|Appears in Collections:||IJC-A Vol.49A(02) [February 2010]|
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