CoMn2O4 spinel from a MOF: synthesis, structure and magnetic studies

A hydrothermal reaction of Mn(OAc)(2)·4H(2)O, Co(OAc)(2)·4H(2)O and 1,2,4 benzenetricarboxylic acid at 220 °C for 24 h gives rise to a mixed metal MOF compound, [CoMn(2){C(6)H(3)(COO)(3)}(2)], I. The structure is formed by the connectivity between octahedral CoO(6) and trigonal prism MnO(6) units connected through their vertices forming a Kagome layer, which are pillared by the trimellitate. Magnetic susceptibility studies on the MOF compound indicate a canted anti-ferromagnetic behavior, due to the large antisymmetric DM interaction between the M(2+) ions (M = Mn, Co). Thermal decomposition studies indicate that the MOF compound forms a tetragonal mixed-metal spinel phase, CoMn(2)O(4), with particle sizes in the nano regime at 400 °C. The particle size of the CoMn(2)O(4) can be controlled by varying the decomposition temperature of the parent MOF compound. Magnetic studies of the CoMn(2)O(4) compound suggests that the coercivity and the ferrimagnetic ordering temperatures are dependent on the particle size.     

Ionic Liquid–Promoted Phospha-Michael Reaction: Convenient Access to β-Nitrophosphonates

A convenient and mild procedure is developed for β-nitrophosphonates via phospha-Michael addition of phosphites to nitrostyrene at room temperature in the presence of 1,8-diazabicyclo-[5.4.0]undec-7-ene (DBU)–based ionic liquid [DBUH][OAc]. The operational simplicity, convenient workup, and reusability of the ionic liquid make this method attractive.     

Experimental realization of constant current device using hydrogen bond ferroelectric liquid crystals

The European Physical Journal E - Magnetorheological fluid (MRF) is a smart responsive fluid, when exposed to the magnetic field, reflects a noticeable transformation in fluid viscosity due to the...