Magneto−Structural Correlation in a Metamagnetic Cobalt(II)-Based Pillared Trilayer Motif Constructed by Mixed Pyridyl-Type Carboxylate Ligands

Abstract

The first structurally authenticated example of coordinated polymer featuring homometallic pillared-trilayer structure, [Co(3)(ina)(2)(pico)(2)(H(2)O)(2)](n) (1), was built from mixed pyridyl-type monocarboxylates, isonicotinate (ina) and 3-hydroxypicolinate (pico), containing Kagome-type [Co(3)(pico)(2)(H(2)O)(2)](n)(2n+) trilayers. The magnetic phase diagram of 1 shows a metamagnetic transition below 3.2 K, arising from the competing interactions between the antiferromagnetic intralayer couplings in different amplitudes with obviously noncompensated moments versus weak AF interlayer coupling.

Synthesis, structures, luminescent and magnetic properties of four coordination polymers with the flexible 1,3-phenylenediacetate ligands

“…The y value is consistent with those of reported Co(II) compounds with m 3 -OH and carboxylate mixed bridges [22,23]. Since the Co(II) chains in 3 are well separated by the long linkers of pda and pyz bridges, the antiferromagnetic behavior can be suggested to arise from intrachain magnetic interactions of the adjacent trimmers.…”

3D Metal–Organic Frameworks Based on Co(II) and Bithiophendicarboxylate: Synthesis, Crystal Structures, Gas Adsorption, and Magnetic Properties

“…Except for the low-temperature range T < 20 K, the temperature dependence of µ eff for 1 and 2 is virtually identical: with decreasing temperature the µ eff is gradually reduced down to~4 µ B owing to a combination of single-ion zero-field splitting effects (partial quenching of orbital moments) and antiferromagnetic interactions of Co(II) ions within the trimers mediated by the carboxylate bridges. This behavior is rather close to those reported for other similar Co(II) MOFs [49][50][51][52]. Given the complicated magnetic ground state of the octahedrally coordinated Co(II) ions [53], a quantitative analysis of the χ p (T) data and exact determination of the AFM exchange interaction of cobalt ions within trimers (J) is hardly achievable.…”

A novel three-dimensional copper(I) cyanide coordination polymer constructed from various bridging ligands: synthesis, crystal structure and characterization

“…Over the past few decades, cyanide-bridged metal coordination polymers have received increasing attention due to their various structures and intriguing magnetic behaviours (Pike, 2012;Zhou et al, 2009;Xu et al, 2016), porous (Zhang et al, 2014;Furukawa et al, 2013;Herm et al, 2013) and luminescence properties (Rocha et al, 2011;Heine & Mü ller-Buschbaum, 2013;Guillerm et al, 2014;Eddaoudi et al, 2015), through the judicious choice of metal centres, as well as bridging or ancillary ligands (Li et al, 2013(Li et al, , 2014Handke et al, 2014). Notably, the cyanide ion is the simplest species containing carbon and nitrogen, and involves a combination of donation by the highest occupied molecular orbital (HOMO) and acceptance ( back-bonding) by the lowest unoccupied molecular orbital (LUMO).…”