Controllable Connection of Fe 2 Se 3 Double Chains and Fe(dien) 2 Complexes for Organic-Inorganic Hybrid Ferrimagnet with a Large Coercivity.

Organic-inorganic hybrid materials built by inorganic and organic building units have attracted intensive interest in the past decades due to unique chemical and physical properties. However, rare organic-inorganic hybrid materials show excellent permanent magnetic properties. Here, we develop a facile chemical solution method to bottom-up synthesize a new hybrid (Fe 2 Se 3 ) 2 [Fe(dien) 2 ] 0.9 . This hybrid phase with the space group P2 1 /c (14) possesses a rodlike shape with a diameter of 100-2000 nm and a length of 5-50 µm. The hybrid rods are ferrimagnetic with a Curie temperature ( T C ) of 11 K. They show a high coercivity ( H C ) of 4.67 kOe and a saturation magnetization ( M S ) of 13.5 emu/g at 2 K. Compared with orthorhombic (FeSe 2 ) 2 Fe(dien) 2 , the excellent magnetic performance of the hybrid rods is ascribed to the monoclinic hybrid structure built by Fe(dien) 2 complexes and Fe 2 Se 3 double chains. Our study provides guidance for connecting inorganic fragments of FeSe 2 single chains, Fe 2 Se 3 double chains or β-Fe 3 Se 4 layers with Fe(dien) 2 complexes for organic-inorganic hybrid phases with varied crystal structures and magnetic properties.