prov:value
| - The compound produced by the method of claim 1 having a structure represented by one of the following formulas wherein M is a metal selected from the group consisting of Ni(II), Cu(II), Zn, Sn, Ge, Si, Ga, Al, Mn(III), Gd(III), In and Tc; R.sub.1 through R.sub.6 are independe
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