The present invention comprises a composition of matter having the formula: M₂[Mn₄(O)(OH)(O₂CR)₂L₂]wherein M is an alkali earth metal selected from magnesium, calcium, strontium, barium or mixtures thereof, R is hydrogen or a hydrocarbyl group, and L is a ligand having the formula: The present invention also encompasses methods for preparing these novel compounds.
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机译：本发明包括具有下式的物质组合物：M 2 [Mn 3（O）（OH）（O 2 CR）2 L 2]其中M是选自镁，钙，锶，钡或它们的混合物的碱土金属，R是氢或烃基，L是具有下式的配体： 本发明还包括制备这些新化合物的方法。
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