Hexadecacobalt(II)-ContaInIng Polyoxometalate-Based Single-Molecule Magnet

摘要

Polyoxometalates (POMs) are a remarkable class of inorganic compounds with enormous structural and compositional diversity and potential applications in various fields, such as catalysis, analytical chemistry, magnetism, nanotechnology, and medicine. In particular lacunary heteropolytungstates of the Keggin and Wells-Dawson type are useful inorganic, diamagnetic ligands allowing for encapsulation of various multinuclear metal-oxo assemblies. Examples of such kinds of structurally, catalytically, and magnetically interesting POMs are the manganese-containing derivative {Mn_(14)W_(36)), the iron-containing derivatives {Fe_9W_(12)}, {Fe_(13)W_(36)}, {Fe_(16)W_(48)}, {Fe_(28)W_(48)), the nickel-containing derivatives {Ni_9W_(27)}, {Ni_8/Ni_9W_(18)}, {Ni_(12)W_(35), and {Ni_(20)W_(34}, and the copper-containing derivatives {Cu_(14)W_(36)} and {Cu_(20)W_(48)X} (X = C1, Br, I). Some transition-metal-containing polyoxomolybdates are also known, such as {Fe_(30)Mo_(72)}, {V_(30)Mo_(72)}, as well as {Co_(16)Mo_(16)} (two types of structures containing 16 cobalt centers, in the form of four tetramers).