In the complex ion K4[Ni(NCS)6].4H2O, the K+ ions are just there to neutralise the charge, as all solids complexes have to have an overall neutral charge and they attach to four of the NCS anions. Am I right?
But I don't understand what the actual role of the water molecules are. I know they're incorporated in the crystal structure, but where and why? Do they stabilise the structure?