Syntheses, structures and magnetic properties of mono- and di-manganese inclusion compounds

Molecular, One‐ and Two‐Dimensional Systems Built from Manganese(II) and Phthalate/Diimine Ligands: Syntheses, Crystal Structures and Magnetic Properties

“…The use of neutral H 2 phth and bipy resulted in the formation of a known Hphth compound with an [Mn 2 (µ-O)(µ-Hphth) 2 ] core. [33] The cyclic tetramanganese cluster 5 was isolated in the presence of bipy, while under similar conditions we only isolated the dinuclear complex 2 in the presence of phen. However, refluxing the reaction mixture containing phth 2Ϫ mentioned precipitate to dissolve, and led to the serendipitous formation of 3 and 4 from a one-pot reaction process.…”

“…[30Ϫ32] In the course of our ongoing work on manganese complexation by dicarboxylates, we have reported a trivalent dinuclear manganese complex with a (µ-oxo)bis(µ-Hphth) bridging core, [33] and have explored the structural transformation mediated by o-, m-and p-phthalate. [34] In this paper, keeping in mind that the number of the manganese complexes derived from phthalate is still low, [31,33Ϫ37] we have further explored the reaction of phthalic acid and a manganese() salt, with the introduc-tion of the chelating 2,2Ј-bipyridine (bipy) and 1,10-phenanthroline (phen) ligands and the exo-bidentate µ-pyrazine (pyz) ligand as ancillary ligands, with the aim of inhibiting the expansion of the polymeric frameworks in order to obtain the desired polynuclear and low-dimensional complexes, or to induce the evolution of a novel structure, and obtained a new series of compounds (1Ϫ7).…”

New Dinuclear MnIII Compounds with 2‐MeC6H4COO and 2‐FC6H4COO Bridges – Effect of Terminal Monodentate Ligands (H2O, ClO4– and NO3–) on the Magnetic Properties

“…Compound 3 also shows a ferromagnetic coupling, while compound 1 is weakly antiferromagnetic. Another analogous compound reported in the literature has two different dinuclear complexes in the crystal, [{Mn(bpy)- 3 )}] (NO 3 ) 3 (11) (phtha = phthalate), [10] one of them with two water molecules and the other with one water and one nitrate ligand. A net ferromagnetic interaction was reported for this compound, where we could expect a different degree of magnetic interaction in each dinuclear complex.…”

“…When the distance values for the x and y axis are similar, and smaller than the distance value found for the z 3 (phtha = phthalate). [10] polyhedron is considered elongated, while if the distance for the x axis is shorter than the distances for the z and y axis ···N t ), and the greater values of this parameter correspond to the compounds with a major antiferromagnetic coupling. For the four compounds reported here the major distortion parameter value corresponds to the complexes with perchlorate as the monodentate ligand.…”

“…[18] Taking into consideration that in compounds 1 and 3 the monodentate ligand H 2 O could be replaced by the NO 3 anion, the different complexes present in the crystal, in each case, have been studied. Other calculations carried out were: -the dihedral angle between the COO group and the aromatic ring, δ, was modified from the original crystallographic coordinates and two values are considered: δ = 17°a nd 45°; -the substituent on the aromatic ring, CH 3 or F was replaced by the other group (F or CH 3 , respectively), in the same position as the original compound, and also, in the opposite position; -for compounds 1 and 3 the crystallographic coordinates of the nitrate group have been modified, with γ angles between 0-180°; -with the aim of making comparisons with other compounds with nitrate ligands calculations with the crystallographic coordinates of compounds 5 [5] and 11 [10] have been also carried out. And the position of the nitrate ligand was also modified with γ angles between 0-180°.…”