In the title salt. [Cu(NO3)(C7H6N2)4]NO3. one nitrate anion is coordinated to the CuII atom. which is also coordinated by the N atoms of four N-heterocycles. https://www.roneverhart.com/Western-Digital-Ultrastar-DC-HC550-WUH721816ALE6L0-0F38460-16TB-7-2K-RPM-SATA-6Gb-s-512e-ISE-3-5in-Hard-Drive/