Thermal Decomposition of [Cu(H<sub>2sub>O)<sub>2sub>(C<sub>8sub>H<sub>4sub>O<sub>4sub>)],[CuNi(H<sub>2sub>O)<sub>4sub>(C<sub>8sub>H<sub>4sub>O<sub>4sub>)<sub>2sub>],and [Ni(H<sub>2sub>O)<sub>2sub>(C<sub>8sub>H<sub>4sub>O<sub>4sub>)<sub>2sub>](H<sub>2sub>O)<sub>2sub> with the Formation of Metal and Bimetal Na