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

DI SANTO, ALEJANDRO; ALBORES, PABLO; REGUERA, EDILSO; GIL, DIEGO MAURICIO; BEN ALTABEF, AIDA; REGUERA, EDILSO; HERNÁNDEZ-SILVA, OSIRY; BEN ALTABEF, AIDA; HERNÁNDEZ-SILVA, OSIRY; CARBONIO, RAUL; CARBONIO, RAUL; DI SANTO, ALEJANDRO; ALBORES, PABLO; GIL, DIEGO MAURICIO

NEW JOURNAL OF CHEMISTRY

ROYAL SOC CHEMISTRY

Año: 2018 vol. 42 p. 1347 - 1355

1144-0546

Four coordination polymers obtained by intercalation of 2-Methylimidazole into transition metal nitroprussides T[Fe(CN)5NO] with T= Mn, Fe, Co and Ni were synthesized and characterized. The resulting hybrid inorganic-organic solids crystallize as dihydrates. All the solids crystallized in an orthorhombic crystal system, space group P212121. Their crystal structures were solved and refined from X-ray diffraction data, complemented with the structural 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 coordination geometry. In the interlayer region, the intercalated molecules remain interacting through π-stacking interactions. The magnetic measurements indicate that all the solids show antiferromagnetic interactions at low temperatures due to intra-sheet antiferromagnetic exchange interactions of moderate strength. Only complexes with Fe(II) and Mn(II) show long-range inter-sheet ferromagnetic ordering.