Abstract
The reaction of (NBu4)2Bzmal (where Bzmal2− is benzylmalonate dianion) with Co(OAc)2∙4H2O 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]·H2O·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 (HDC = 1000 Oe) magnetic relaxation behavior.
Highlights
Cobalt coordination complexes exhibit redox [1,2], optical [3,4], and magnetic [5,6] properties that can be attractive for application in catalysis [7,8], biology, and medicine [9,10]
Available reagents were used for the preparation of the compounds: Co(OAc)2 ·4H2 O (ChemPur, 99%, Karlsruhe, Germany), benzylmalonic acid (Sigma-Aldrich, 99%, Steinheim, Germany), 2,20 -bipyridine (Alfa Aesar, 98% Karlsruhe, Germany), tetrabutylammonium hydroxide solution
This study showed the easy plane magnetic anisotropy of octahedral cobalt(II) ions in polymeric and molecular complexes
Summary
Cobalt coordination complexes exhibit redox [1,2], optical [3,4], and magnetic [5,6] properties that can be attractive for application in catalysis [7,8], biology, and medicine [9,10]. It is known that the spin-orbit splitting in coordination compounds with “magnetic” metal ions arises as a result of structural distortions in the crystal and lowers various symmetries of the magnetic ion except octahedral. In this case, single-ion anisotropy occurs due to splitting in zero field (ZFS) and is a very important reason for the appearance of the properties of single-molecule/ion magnet (SMM/SIM) [6,12]. There are some examples of mononuclear octahedral cobalt(II) complexes with easy plane magnetic anisotropy that exhibit field-induced slow magnetic relaxation behavior—i.e., SIM properties [14,15,16,17,18,19]
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