3D Homometallic Carboxylate Ferrimagnet Constructed from a Manganese(II) Succinate Carboxylate Layer Motif Pillared by Isonicotinate Spacers

Abstract

A manganese succinate having a layer structure in which the layers are pillared by the isonicotinate spacers in a 3D architecture exhibits long-range ferrimagnetic order below 5.0 K, with the ferrimagnetism arising, for topological reasons, from the nature of the carboxylate binding modes. The compound is the first structurally authenticated example of a 3D ferrimagnet, featuring a homometallic topological ferrimagnetic sheet among metal carboxylates.

Temperature-Controlled Assembly/Reassembly of Two Dicarboxylate-Based Three-Dimensional Co(II) Coordination Polymers with an Antiferromagnetic Metallic Layer and a Ferromagnetic Metallic Chain

“…The temperature dependence of χ M T values of compound 1 is shown in Figure 6. The spin-only value at 300 K is 3.34 cm 3 K mol –1 , which is in agreement with that of the measured, calculated by a high-spin Co(II) ion with S = 3/2 with a strong spin-orbit coupling [58]. The χ M T value of 1 continues to decrease with cooling of the temperature from 300 to 10 K, below 10 K the value of χ M T decreases more rapidly to 1.40 cm 3 K mol –1 at 2.0 K. The monotonic decrease in the χ M T value with decreasing temperatures are characteristics of overall antiferromagnetic interactions and/or spin-orbital couplings in compound 1 .…”

A Hybrid Open-Framework Structure Containing Different Manganese Phosphate Chains as Its Building Blocks

“…The magnetic moments (μ eff ) at 300 K per mole of manganese atom are 5.81 μ B for 1 and 5.78 μ B for 2 , in agreement with the expected spin-only value of manganese(II) in the high-spin state (5.92 μ B ). For compound 1 , when the temperature is decreased, the χ M T values smoothly decrease to a minimum (1.66 cm 3 K mol –1 ) at 12 K. Below 12 K, χ M T sharply increases and reaches a maximum value (11.15 cm 3 K mol –1 ) at around 5.5 K before eventually falling to 6.07 cm 3 K mol –1 at 2.0 K. This curve is similar as that of [Mn 3 (suc) 2 (ina) 2 ] n , which is characteristic of ferrimagnetic behavior caused by the structural factor of the Mn–O–Mn chain . The thermal evolution of χ M follows the Curie–Weiss law at temperatures above 12 K, with C m = 4.53 cm 3 K mol –1 and θ = −23.1 K. Similar to other isostructural manganese phosphate–oxalates, compound 2 is an antiferromagnet.…”

Field-Induced Slow Magnetic Relaxation and Anion/Solvent Dependent Proton Conduction in Cobalt(II) Coordination Polymers

“…The design and synthesis of coordination polymers are of immense interest not only because of their intriguing architectures and topologies, but also for their wide applicability in various fields such as proton conduction, gas storage and separation, and molecular magnetism. − In molecular magnetism, coordination polymers provide excellent examples to better understand some fundamental magnetic phenomena such as ferromagnetism, antiferromagnetism, ferrimagnetism, spin-canting, and metamagnetic transition, − and their correlation with structure. Magnetism of metal–organic framework (MOF) materials containing paramagnetic metal centers, which are separated by adequately functionalized organic moieties, has emerged as a rapidly growing field of research as these materials can easily give rise to magnetic subnetworks of varied dimensions .…”