Synthesis, crystal structures and magnetic properties of picolinate-bridged copper(II) chains

The paper reports the synthesis, crystal structures, and magnetic properties of two copper(II) coordination polymers, Cu2(L1)4 (1) and Cu3(L2)6 (2), based on rigid ethynylene-bridged ditopic ligands containing one picolinate subunit (L1 = 5-(pyridin-3-ylethynyl)picolinate anion; L2 = 5-((4-(methoxyc...

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Bibliographic Details
Published inJournal of coordination chemistry Vol. 71; no. 5; pp. 644 - 656
Main Authors Jornet-Mollá, Verónica, Martín-Mezquita, Carlos, Duan, Yan, Giménez-Saiz, Carlos, Romero, Francisco M.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Ltd 04.03.2018
Subjects
Anions
Antiferromagnetism
Chemical synthesis
Coordination polymers
Copper
Copper compounds
Crystal structure
Magnetic properties
Magnetism
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Summary:The paper reports the synthesis, crystal structures, and magnetic properties of two copper(II) coordination polymers, Cu2(L1)4 (1) and Cu3(L2)6 (2), based on rigid ethynylene-bridged ditopic ligands containing one picolinate subunit (L1 = 5-(pyridin-3-ylethynyl)picolinate anion; L2 = 5-((4-(methoxycarbonyl)phenyl)ethynyl)picolinate anion). Both 1 and 2 have a chain structure. In 1, the repeating unit in the chain is a doubly bridged picolinate dicopper(II) complex, whereas 2 is built upon trimeric units where the Cu2+ ions are also connected by double picolinate bridges. Both compounds exhibit antiferromagnetic interactions in the solid state. The magnetic properties of 1 and 2 were analyzed in terms of simple dimer (H = -2JSCuSCu) and linear trimer [H = -2J(SCu1SCu2+SCu2SCu1)] models, respectively, neglecting the intermolecular interactions between the polynuclear units. The values of the exchange coupling parameters were J = -0.59 and J = -0.30 cm-1 for 1 and 2, respectively.
ISSN:0095-8972
1029-0389
DOI:10.1080/00958972.2018.1437267