Abstract

The synthesis and magnetic properties of [M(Cp*)2][Ni(tds)2], M = Fe. Mn and Cr: tds = bis(trifluoromethyl)ethylenediselenato, are reported. The crystal structure for these compounds consists of an array of parallel stacks of alternating cations, [M(Cp*)2]±, and anions, [Ni(tds)2]−, ··D±A−D±A−D±A−··. For [Fe(Cp*)2][Ni(tds)2] and [Mn(Cp*)2][Ni(tds)2] the magnetic behavior is dominated by FM interactions, with Θ values of 10.6 and 24.6 K respectively, while for [Cr(Cp*)2][Ni(tds)2] the magnetic behavior is dominated by AFM interactions, with Θ = −86.4 K. [Mn(Cp*)2][Ni(tds)2], at low temperatures, shows a metamagnetic behavior. with TN = 2.1 K and HC = 60 G.

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