Synthesis, crystal structures and magnetic properties of picolinate-bridged copper(II) chains. Issue 5 (4th March 2018)

• Record Type: Journal Article
• Authors: Jornet-Mollá, Verónica; Martín-Mezquita, Carlos; Duan, Yan; Giménez-Saiz, Carlos; Romero, Francisco M.
• Is Part Of: Journal of coordination chemistry. Volume 71:Issue 5(2018)
• Page Start: 644
• Page End: 656
• Publication Date: 2018-03-04
• Subjects: Magnetic properties -- copper(II) -- metal–organic frameworks; Coordination compounds -- Periodicals; 541.2242
• DOI: 10.1080/00958972.2018.1437267
• Languages: English
• ISSNs: 0095-8972

Abstract

Abstract: The paper reports the synthesis, crystal structures, and magnetic properties of two copper(II) coordination polymers, Cu2 (L 1 )4 (1 ) and Cu3 (L 2 )6 (2 ), based on rigid ethynylene-bridged ditopic ligands containing one picolinate subunit (L 1 = 5-(pyridin-3-ylethynyl)picolinate anion;L 2 = 5-((4-(methoxycarbonyl)phenyl)ethynyl)picolinate anion). Both1 and2 have a chain structure. In1, the repeating unit in the chain is a doubly bridged picolinate dicopper(II) complex, whereas2 is built upon trimeric units where the Cu 2+ ions are also connected by double picolinate bridges. Both compounds exhibit antiferromagnetic interactions in the solid state. The magnetic properties of1 and2 were analyzed in terms of simple dimer (H = –2 J S Cu S Cu ) and linear trimer [H = –2 J (S Cu1 S Cu2 +S Cu2 S Cu1 )] 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 for1 and2, respectively. Abstract :