Synthesis, structure and magnetism of a new ferromagnetic hexanuclear nickel cluster with a dicubane-like core

Abstract

A new ferromagnetic nickel(II) hexameric structure based on the versatile N,O3-ligand 2,2',2"-nitrilotribenzoic acid has been prepared and characterised by X-ray crystallography and magnetic measurements; the compound represents a rare example of a nickel cluster with a dicubane-like core having only oxygen bridges.

A Systematic Exploration of Nickel(II)/Acetate/Di‐2‐pyridyl Ketone Chemistry: Neutral and Cationic Tetranuclear Clusters, and a Novel Mononuclear Complex

“…[24] In the three previously characterized [16a,16b] tetranuclear defect dicubane Ni II clusters possessing exclusively oxygen monoatomic bridges, ferromagnetic exchange interactions have been observed leading to a S = 4 ground state. However, in the present case of 4, competing ferromagnetic and antiferromagnetic interactions are observed as a result of the two different types of Ni-O-Ni angle values, those at 94.8 and 96.8°, and those between 100.6 and 103.7°.…”

Structural diversity in NiII cluster chemistry: Ni5, Ni6, and {NiNa2}n complexes bearing the Schiff-base ligand N-naphthalidene-2-amino-5-chlorobenzoic acid

“…Complex 4 exhibits a rather unusual topology among the hundreds of structurally characterized Ni clusters to date; only the ferromagneticallycoupled complex (NHEt 3 ) 2 [Ni 6 (OH) 2 (L) 4 (H 2 O) 2 ] (LH 3 = 2,2′,2″nitrilotribenzoic acid) reported by Krämer and co-workers has shown a similar metal topology. 32 The crystal of 5 contains two co-crystallized {NiNa 2 } coordination polymers with very similar formulas and both with onedimensional motifs. The [NiNa 2 (nacb) 2 (MeOH) 2 ] n (5a) and [NiNa 2 (nacb) 2 (MeOH) 2 (H 2 O) 2 ] n (5b) polymers differ only in the presence of two terminally ligated water molecules on the Na I cations of 5b.…”

“…The values of the calculated J-coupling constants are consistent with the structural features of complex 2 and the associated metric parameters; thus, the dominant antiferromagnetic interactions observed in 2 are attributed to the large Ni-O-Ni bond angles which span the range 93.1(2)-105.2(2)°. 8,[28][29][30][31][32]34,36 Magnetization vs. field data (Fig. 9) were collected at 2 K and the experimental results were nicely reproduced for an isolated S = 1 ground state with a g value of 2.10 and a D value of 1.6 cm −1 (R = 2.2 × 10 −4 ), where D is the ground state zero-field splitting parameter.…”

Synthesis, crystal structure, magnetic property and oxidative DNA cleavage activity of an octanuclear copper(II) complex showing water–perchlorate helical network

“…14) from methanol-water mixture. The cluster is formed by the linkage of two bimetallic cationic units and a tetranuclear dicubane core [57]. The metal centers in tetranuclear core are coordinated by a l 2 -alkoxo oxygen atom and a l 2 -phenoxo oxygen atom of the ligand H 3 L and one l 3 -hydroxo oxygen atom to form a dicubane-like core.…”