Complex Ion Definition in Chemistry

Complex Ion Definition in Chemistry

Complex Ion Definition: Complex ions are ions with a central metal ion bonded to one or more molecules or ions. They are a type of coordination complex. The central ion is the coordination center, while the molecules or ions bound to it are termed complexing agents or ligands.

Examples: The copper ammine ion, Cu(NH3)62+ is a complex ion.


  • Cotton, Frank Albert; Geoffrey Wilkinson; Carlos A. Murillo (1999). Advanced Inorganic Chemistry. p. 1355. ISBN 978-0-471-19957-1.
  • Lawrance, Geoffrey A. (2010). Introduction to Coordination Chemistry. Wiley. doi:10.1002/9780470687123. ISBN 9780470687123.