Hexacyanometallate anions as precursors of two new trinuclear heterobimetallic assemblies: Syntheses, structures and cryomagnetic properties

Two new cyano bridged Cu–Co and Cu–Fe trinuclear bimetallic assemblies, [(CuL)[Co(CN)6](CuL)]ClO4 · 3.5H2O (1) and [(CuL)[Fe(CN)6](CuL)] · 13H2O (2) where [L = (3E,5E)-N1,N4-bis((pyridin-2-yl)methylene)butane-1,4-diamine] have been prepared using cyanometallates as anion precursors and characterised by elemental analyses, spectroscopic studies, single crystal X-ray diffraction and cryomagnetic susceptibility measurements. Magneto-structural correlations have been drawn from cryomagnetic susceptibility measurements over a wide temperature range (2–300 K) under 0.5 T magnetic fields. Weak antiferromagnetic interactions with J = −0.81 and −0.73 cm−1 are found for 1 and 2, respectively, showing a very weak coupling, as expected from the diamagnetic long chain –NC–Co–CN–CN– and –NC–Fe–CN–CN– bridges revealed from the single crystal X-ray diffraction studies.

Two new cyano bridged Cu–Co and Cu–Fe trinuclear bimetallic assemblies, [(CuL)[Co(CN)6](CuL)]ClO4 · 3.5H2O (1) and [(CuL)[Fe(CN)6](CuL)] · 13H2O (2) [where L = N,N′-bis(2-pyridylmethylene)butane-1,4-diamine] have been prepared using cyanometallates as anion precursors, and they have been characterised by elemental analyses, spectroscopic studies and single crystal X-ray diffraction. Cryomagnetic susceptibility measurements exhibit weak anti-ferromagnetic interactions with J = −0.81 and −0.73 cm−1 for 1 and 2, respectively.Figure optionsDownload as PowerPoint slide