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Temperature-Controlled Assembly/Reassembly of Two Dicarboxylate-Based Three-Dimensional Co(II) Coordination Polymers with an Antiferromagnetic Metallic Layer and a Ferromagnetic Metallic Chain
Ist Teil von
Polymers, 2019-05, Vol.11 (5), p.795
Ort / Verlag
Switzerland: MDPI AG
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Free E-Journal (出版社公開部分のみ)
Beschreibungen/Notizen
Two new dicarboxylate-based three-dimensional cobalt coordination polymers, [Co(Me
mal)(bpe)
(H
O)]
(
) and [Co(Me
mal)(bpe)
]
(
), were synthesized from dimethylmalonic acid (H
-Me
mal) in temperature-controlled solvothermal reactions. Lower temperatures (6080 °C) favored the formation of
, while higher temperatures (120 °C) favored the production of 2. Compound
is comprised of Co(II) corrugated layers linked by
-
carboxylate bridges from the Me
mal
ligands and pillared through
-monodentate bpe groups. Compound
is comprised of a three-dimensional network involving one-dimensional Co-carboxylate chains bonded by antisymmetric µ
-Me
mal
ligands and aligned parallel to the [001] direction. The solvothermal retreatment of crystalline samples of
in a DMF/H
O solvent at 120 °C allowed the structural reassembly, with complete conversion within
over 48 h. Magnetic analyses revealed that compound
exhibits both spin-orbital coupling and antiferromagnetic interactions through a
-
carboxylate (Me
mal
) bridge exchange pathway [Co-Co separation of 5.478 Å] and compound
showed a ferromagnetic interaction resulting from the short Co-Co separation (3.150 Å) and the small Co-O-Co bridging angles (98.5° and 95.3°) exchange pathway which was provided by µ
-Me
mal
bridging ligand.