C 8912 (OTTO) Copper(II) nitrate hemi(pentahydrate) , ACS reagent, 98% Cas 19004-19-4 - used in the preparation of 4-methoxypyridine-(pyridine-2,6-dicarboxylato-N,O,O′)copper(II) and in the synthesis of coordination pillared-layer frameworks (CPLs), particularly CPL-1, via mechanochemical method.