Ferrimagnetic, bimetallic chain systems: [Ni(tetren)]ReCl6 and [Ni(tetren)]ReCl6·CH3OH where tetren=tetraethylenepentamine
摘要:
Reaction of nikiel (H) chloride with tetraethylenepentamine (tetren) and tetrabutylammonium, hexachlororhenate [Bu4N](2)ReCl6 produced a new kind of binuclear compounds: [Ni(tetren)]ReCl6 (1) and [Ni(tetren)]ReCl6 - CH3OH (2) in which [ReCl6](2-) anions and [Ni(tetren)](2+) cations are held united by electrostatic forces. The magnetic behaviour of 1 and 2 has been investigated over the temperature range 1.7-300 K. Compound 1 behaves as a ferrimagnetic Ni-II Re-IV bimetallic, one-dimensional (1D) chain with intrachain antiferromagnetic coupling. A hysteresis loop characteristic of a soft magnet has been obtained. Compound 2 shows weak antiferromagnetic interactions within Ni-II-Re-IV units. (C) 2004 Elsevier B.V. All rights reserved.