Hybrid materials composed of tetravanadate motifs: Synthesis, structure and magnetic properties of the open framework structure solids [{M(C5H5N)4}2]V4O12 (M = Cu, Co)

Two new inorganic–organic hybrid materials – [{M(C5H5N)4}2]V4O12 (M = Cu, 1; M = Co, 2) have been synthesized and characterized by spectroscopic methods, X-ray powder diffraction, thermogravimetry, magnetometry and complete single crystal structure analysis. The structures of 1–2 are comprised of layers containing centrosymmetric {V4O12} rings connected to {M(C5H5N)4} units by V–O–M bridges (M = Cu, 1; M = Co, 2). The layers are parallel to the (1 0 1) crystal planes and there are pyridine stacking interactions between layers. The effective magnetic moment, μeff, values for 1 and 2 are 1.9 μB and 3.9 μB, respectively, indicating some orbital contributions in each case. Both compounds exhibit Curie–Weiss magnetic behavior over the entire range above the critical temperature.

Graphical abstractHybrid materials [{M(C5H5N)4}2]V4O12 (M = Cu, Co) are composed of layers containing {V4O12} rings connected to {M(C5H5N)4} units by V–O–M bridges. The layers are parallel to (1 0 1) crystal planes and there are pyridine stacking interactions between layers. Compounds exhibit Curie–Weiss magnetic behavior over the entire range above the critical temperature.Figure optionsDownload full-size imageDownload as PowerPoint slide