Cobalt(Ii) Complexes Based On Benzylmalonate Anions Exhibiting Field-Induced Single-Ion Magnet Slow Relaxation Behavior

The reaction of (NBu4)(2)Bzmal (where Bzmal(2-) is benzylmalonate dianion) with Co(OAc)(2)center dot 4H(2)O gives the [Co(Bzmal)(EtOH)(H2O)](n) 2D-polymer (1). The addition of 2,2 '-bipyridine (bpy) to the starting system results in the [Co(Bzmal)(bpy)(2)]center dot H2O center dot EtOH molecular complex (2). Their molecular and crystal structures were analyzed by single-crystal X-ray crystallography. An analysis of the static magnetic data supported by the SA-CASSCF/NEVPT2 calculations revealed the presence of easy-plane magnetic anisotropy in both complexes. The AC susceptibility data confirm that both complexes show a slow field-induced (H-DC = 1000 Oe) magnetic relaxation behavior.