A method for evaluating second sphere H-bonding interactions as a means to tune specific characteristics in coordinating ligands has been used to evaluate the binding strength of a series of beryllium complexes.
The synthesis and structural characterisation of four new heterometallic tetranuclear complexes is reported. Three L3Ni3Ln type complexes, where Ln = La (C1), Eu (C2), and Gd (C3), have been fully...
We report the synthesis and characterization of four new tetranuclear Ni(II) complexes, C1-C4, all of which exhibit defective dicubane cores. The complexes C1-C4 are derived from the same salicylaldoxime derived...
We report the synthesis
and characterization of seven new tetranuclear
3d–4f complexes derived from the 3:3:1 reaction of 1,4-diformylnaphthalene-2,3-diol
(H2
L) with copper(II) nitrate and a lanthanide
salt, Ln = Tb [L
3Cu3TbCl2(NO3)2(H2O)2] (C1), Ho [L
3Cu3HoCl3(H2O)3(MeOH)](H2O) (C2), Er [L
3Cu3ErCl3(H2O)3.5(MeOH)0.5](H2O) (C3), Gd [L
3Cu3Gd(NO3)2(H2O)2(MeOH)](NO3) (C4), Dy [L
3Cu3Dy(NO3)2(H2O)2(MeOH)](NO3) (C5), Yb [L
3Cu3Yb(NO3)2(H2O)2(MeOH)](NO3) (C6), and
La [L
3Cu3La(NO3)2(H2O)2(MeOH)](NO3) (C7). Structural elucidation showed that the self-assembly
using the acyclic ligand system was successful for all seven complexes,
which exhibit the same near-planar Cu3LnO12 core.
Five complexes (C1, C2, and C4–C6) were magnetically characterized at 300 K
and 1.8 K. Complexes C1, C4, and C5 were observed to have ferromagnetic ground states and showed appreciable
frequency dependence in their AC magnetic measurements, which yielded
effective barriers between 7.82(4) and 13.2(3) K, confirming the presence
of single-molecule magnet properties.
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