Valence tautomerism in a [2 × 2] Co grid complex containing a ditopic arylazo ligand.

We describe the structural and magnetic properties of a tetranuclear [2 × 2] Co4 grid complex containing a ditopic arylazo ligand. At low temperatures and in solution the complex is comprised of Co3+ and singly reduced trianion-radical ligands. In the solid state we demonstrate the presence of valence tautomerization via variable temperature magnetic susceptibility experiments and powder-pattern EPR spectroscopy.

Understanding the Interplay of Vacancy, Cation, and Charge Ordering in the Tunable ScVO Defect Fluorite System.

We report the synthesis, structure, and redox behavior of the cation-ordered tetragonal ScVO defect fluorite superstructure previously thought to be the oxygen precise ABO phase. Four synthesis routes in oxidative, reductive, and inert atmospheres are demonstrated. and powder X-ray and neutron diffraction analyses reveal vanadium disproportionation reactions.

Absence of magnetic ordering in the spin liquid candidate CaCuGeVO.

Typically, quantum spin liquid candidates can be found in materials with a combination of geometrical frustration along with low spin. Due to its spin of S  =  1/2 the copper (II) ion is often present in the discussion on spin liquid candidates. The solid state compound CaCuGeVO is a material that crystallizes in the garnet structure (s.

Structure and Magnetic Properties of KRuO.

The crystal structure of KRuO is refined at both 280 and 3.5 K from neutron powder data, and magnetic properties are reported for the first time. The scheelite structure, I4/a, is confirmed at both temperatures.