Dissimilar supramolecular organization for the heterotrimetallic assemblage [{LNiLn}{W(CN)8}] with Ln = Y and La (L = Schiff-base derivative)

Abstract

Heterotrimetallic {3de5de4f} compounds have been prepared by assemblage of {W(CN) 8 } 3À and {L Me2 NiLn} 3þ units, with Ln ¼ Y (1) and La (2). These have been found to exhibit different supramolecular organizations. A chain structure is formed for Ln ¼ Y, whereas La leads to a hexanuclear aggregate. The investigation of the magnetic behavior for these compounds revealed ferromagnetic WeNi interaction with J ¼ 20 cm À1 for 2. To cite this article:

Co-crystal structure of a dinuclear (Zn-Y) and a trinuclear (Zn-Y-Zn) complexes derived from a Schiff base ligand

“…In both dinuclear and trinuclear units of the co-crystal, the Y-Ophenoxo bonds have the shortest distances which fall in the range 2.020(3) -2.360(3) Å. These values are comparable with the distances for a trinuclear complex [{LNiY(H2O)4} {W(CN)8}]∞.9.5H2O obtained from an analogous ligand [34]. The Y-Omethoxy are the longest distances in the two different units 2.613(4) -2.717(3) Å and are longer than those reported for the above compound in which the value of the mean distances of the Y-Omethoxy is 2.557 Å [30].…”

1-D hydrogen-bonded organization of hexanuclear {3d-4f-5d} complexes: evidence for slow relaxation of the magnetization for [{LMe2Ni(H2O)Ln(H2O)4.5}2{W(CN)8}2] with Ln = Tb and Dy

“…Most relevant regarding magnetic interactions are those providing short pathways between magnetic centers. 26,29,30 This applies for the H-bonds formed between H 2 O coordinated to Tb and the CN of W2. Six such linkages (d O/N < 2.83 A ˚) connect each hexanuclear complex to two neighboring aggregates hence developing a 1-D organization along the crystallographic a axis (Fig.…”

“…[22][23][24][25] Preliminary results confirmed the expected {3d-4f-5d} assemblage. 26,27 Herein, we report on an isomorphous series of hexanuclear {3d-4f-5d} compounds for which the magnetic properties have been modulated simply by varying the nature of the Ln ion for the bimetallic partner.…”

From Heptacoordinated CrIII Complexes with Cyanide or Isothiocyanate Apical Groups to 1D Heterometallic Assemblages with All‐Pentagonal‐Bipyramid Coordination Geometries

“…Their association with cyanometallates, either diamagnetic [Au(CN) 2 ] – , Ni(CN) 4 ] 2– , or [Co(CN) 6 ] 3–[4e,6] or paramagnetic [M(CN) x ] n – ( x = 6, M = Cr III , Fe III , x = 8, M = Mo IV , Nb IV , W IV/V ),[4a], sheds light on their interest as building blocks for low‐dimensional heterometallic compounds, including molecular‐magnets,[4a], [4b], [6b], [7c], [8a] and photo‐switchable species. [8d], However, in polymetallic compounds constructed from [M(CN) x ] n – metallo‐ligands, the nonbridging cyanide groups are able to mediate sizeable intermolecular interactions by means of hydrogen bonds, which, in addition to the eventuality of growing polymers of higher dimensionality,[6b], [8b] becomes a serious drawback when low‐dimensional magnetic behavior is targeted.…”