Slow Magnetic Relaxation in a One-Dimensional Coordination Polymer Constructed from Hepta-Coordinate Cobalt(II) Nodes

Abstract

A one-dimensional coordination polymer was synthesized employing hepta-coordinate CoII as nodes and dicyanamide as linkers. Detailed direct current (DC) and alternating current (AC) magnetic susceptibility measurements reveal the presence of field-induced slow magnetic relaxation behavior of the magnetically isolated seven-coordinate CoII center with an easy-plane magnetic anisotropy. Detailed ab initio calculations were performed to understand the magnetic relaxation processes. To our knowledge, the reported complex represents the first example of slow magnetic relaxation in a one-dimensional coordination polymer constructed from hepta-coordinate CoII nodes and dicyanamide linkers.

Combined experimental and theoretical investigation on the magnetic properties derived from the coordination of 6-methyl-2-oxonicotinate to 3d-metal ions

“…[12][13][14][15][16][17][18] With regard to the latter, many efforts have been devoted to understand magnetic exchange and magnetic anisotropy in CPs since it was shown that slow relaxation of the magnetization (SRM) could be extended from single-molecule magnets to these extended systems. [19][20][21][22] This new subclass of molecular magnets, belonging to the large group of single-ion magnets (SIMs), consist of only one spin carrier with large magnetic anisotropy and lack of exchange interactions between paramagnetic metal ions along the network. 23 This fact makes them useful for all the potential applications attributed to SMMs, i.e.…”

An experimental and theoretical study of the magnetic relaxation in heterometallic coordination polymers based on 6-methyl-2-oxonicotinate and lanthanide(iii) ions with square antriprismatic environment

“…17,20,21 Owing to the low capacity of most of organic ligands to transmit significant long-range exchange interactions, single-ion magnets (SIMs) are preferred for this purpose because their magnetic response is intrinsic to the metal centre. [22][23][24][25][26] This new subclass of molecular magnets, in which the slow relaxation of the magnetization (SRM) is derived from mononuclear lanthanide ions, have demonstrated the same potential applications attributed to SMMs, i.e. high-density data storage, quantum computing, molecular spintronics and enhancing the pseudocontact shift in nuclear magnetic resonance.…”

Synthesis, structure, magnetic properties and thermal behaviour of Ba–MII (MII = Mn, Co, Cu, and Zn) allylmalonates

“…6 Particular attention is paid to the cobalt( ii ) ion, for which a significant number of coordination compounds demonstrating the properties of single ion magnets (SIM) have been obtained and studied. 6 b ,7 Depending on the geometry of the coordination environment, two types of magnetic anisotropy, axial or planar, can be implemented for cobalt( ii ) ions, which determines the value and sign of zero-field splitting (ZFS) parameter D . For SIM properties to exist in zero field, axial magnetic anisotropy (negative D ) is required, which sets two states with ± M s and a barrier to magnetization reversal, U eff ( U eff = | D |· S 2 ).…”