New coordination polymers based on 2-methylimidazole and transition metal nitroprussides containing building blocks: Synthesis, structure and magnetic properties.

A. DI SANTO; H. OSIRY; E. REGUERA; P. ALBORÉS; R. E. CARBONIO; A. BEN ALTABEF; A. BEN ALTABEF

NEW JOURNAL OF CHEMISTRY

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2018 p. 1347 - 1355

1144-0546

Four coordination polymers obtained by intercalation of 2-Methylimidazole into transitionmetal nitroprussides T[Fe(CN)5NO] with T= Mn, Fe, Co and Ni were synthesized andcharacterized. The resulting hybrid inorganic-organic solids crystallize as dihydrates. Allthe solids crystallized in an orthorhombic crystal system, space group P212121. Their crystalstructures were solved and refined from X-ray diffraction data, complemented with thestructural information derived from spectroscopic (IR, Raman and UV-Vis) and thermaldata. The molecules intercalated occupy the axial coordination sites of the metal T(II),while the Fe atom of the nitroprusside anion preserves the octahedral coordinationgeometry. In the interlayer region, the intercalated molecules remain interacting throughπ-stacking interactions. The magnetic measurements indicate that all the solids showantiferromagnetic interactions at low temperatures due to intra-sheet antiferromagneticexchange interactions of moderate strength. Only complexes with Fe(II) and Mn(II) showlong-range inter-sheet ferromagnetic ordering.