Structure, Magnetic Properties and Magnetic Phase Diagram of a Layered, Bimetallic, Cyanide-Bridged CrIII-NiII Metamagnet

Abstract

The reaction of hexacyanochromate(III) with Ni(tmc)2+ (tmc = tetramethylcyclam) leads to the formation of the layered compound [Ni(tmc)]3[Cr(CN)6]2·18H2O displaying a corrugated sheet structure. Within each layer, the Ni(tmc) units are surrounded by two Cr(CN)6 complexes in a trans fashion while the Cr(CN)6 units are linked to three Ni(tmc) molecules in facial positions. The magnetic studies show ferromagnetic interaction for a NiII(d8, t2g6eg2)−CN−CrIII(d3, t2g3) system within the layers. Below a critical temperature (TN = 14 K), a bulk antiferromagnetic order is observed due to a small interlayer antiferromagnetic interaction. An antiferromagnetic → ferromagnetic phase transition occurs for an applied field HC of 1200 Oe expressing the metamagnetic behavior of the compound. The phase diagram of the compound was constructed and the antiferromagnetic interlayer magnetic energy was estimated to be equal to 0.1 cm−1.

A Ferromagnetic Methoxido-Bridged Mn(III) Dimer and a Spin-Canted Metamagnetic μ1,3-Azido-Bridged Chain

“…Similar behavior has been observed in a cyanide bridged Cr−Ni metamagnet. 43 Note also that similar, although not identical, behavior has already been observed in other Co(II) and Mn(III) chain systems. 36,38,45,46 ■ ASSOCIATED CONTENT…”

Syntheses, Structural Studies, and Magnetic Properties of Divalent Cu and Co Selenites with Organic Constituents

“…This field‐dependent behavior is indicative of a metamagnetic or spin‐flop phase transition exhibited for weakly coupled antiferromagnets 23. 24 Evidence for the phase transition was confirmed by ac susceptibility and field‐cooled (FC)/zero‐field‐cooled (ZFC) measurements.…”

“…The estimated canting angles are 0.04 and 2.2° for compounds 3 and 4 , respectively. This angle is calculated according to the equation ψ = tan −1 ( M r / M s ), where M r is the remnant magnetization and M s = gS is the expected saturation magnetization if all the moments are aligned ferromagnetically 24. 34…”

The social behavior of older animals. By Anne Innis Dagg. Baltimore: Johns Hopkins University Press, 2009. Pp. ix +225

“…Cyanometallat‐Anionen können vielfältige Geometrien einnehmen: z. B. lineare wie bei [M(CN) 2 ] − (M=Au,62, 63 Ag64–66), trigonale wie bei [Cu(CN) 3 ] 2− ,67 tetraedrische wie bei [Cd(CN) 4 ] 2− ,68–71 quadratisch‐planare wie bei [M(CN) 4 ] 2− (M=Ni,41 Pd,72–74 Pt72, 75), oktaedrische wie bei [M(CN) 6 ] 3− (M=Fe,76–80 Co,76, 81, 82 Cr,83–85 Mn86, 87) und pentagonal‐bipyramidale wie bei [Mo(CN) 7 ] 4− 88–91. Insbesondere das Octacyanometallat‐Ion [M(CN) 8 ] n − (M=Mo, W) bildet mehrere unterschiedliche Geometrien aus (quadratisch‐antiprismatische, dodekaedrische, zweifach überdachte trigonal‐prismatische) 91–93.…”