Strong ferromagnetism between copper(II) ions separated by 6.7 .ANG. in a new phthalato-bridged copper(II) binuclear complex

Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi2 Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

“…[ [40][41][42] www.eurjic.org In summary, all three new compounds are discrete tetranuclear nickel(II) complexes composed of pairs of bioctahe-…”

A Structural and Magnetic Investigation of Ferromagnetically Coupled Copper(II) Isophthalates

“…[3][4][5][6] Alhough magnetic interactions transmitted through phenyldicarboxylate bridges are usually weak, [2,[6][7][8] the magnitude and nature of the coupling interactions can be influenced by a series of factors, such as the separation of the metal centers, bridging modes, degree of coplanarity between the coordination basal planes and the ligand, the dihedral angles between the carboxylato planes and the phenyl ring, and the angle between the planes of the two carboxylato groups of each phthalato bridge. [9][10][11][12] In copper phthalates, magnetic systems with terephthalate as bridges are the most abundant, whereas those with isophthalate have been less widely re-isophthalate anion acts as a bis(monodentate) ligand bridging copper(II) centers. The variable temperature magnetic behavior reveals the existence of ferromagnetic interactions in 1-3.…”

Synthesis, characterization, and bioactivities of copper complexes with N-substituted Di(picolyl)amines

“…The infrared spectra of the complexes (2) and (3) show m as (COO) stretching frequencies at 1643 cm -1 and m sym (COO) at 1388 cm -1 , respectively. The difference between m as (COO) and m sym (COO) are about 255 cm -1 , suggesting that the carboxylate groups coordinate to the copper(II) atoms only as monodentate ligands [18].…”