The resulting complex had what is known as square-planar geometry. This means that the nickel is in the center and the ligands are arranged around it at the four compass points, all in the same plane.

More information: Aleix Barrera et al, On-Chip Planar Metasurfaces for Magnetic Sensors with Greatly Enhanced Sensitivity, ACS Nano (2025). DOI: 10.1021/acsnano.5c00422 ...

Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, ...