Los Compuestos de coordinación son aquellos formados por metales de transición con moléculas o grupos aniónicos, llamados ligantes. Los metales de transición más conocidos en estos compuestos son el hierro, cobre, níquel, platino, entre otros. Los ligantes generalmente se conforman por átomos con pares de electrones libres, como los siguientes: H2O, NH3, CN-, CO, Cl-, etilendiamina.
Los elementos de transición son conocidos por su gran capacidad para formar compuestos de coordinación, por su facilidad para formar enlaces covalentes con la participación de los electrones d, por su tendencia a reaccionar químicamente en diferentes estados de oxidación estables y a cambiar con relativa facilidad de unos estados de oxidación a otros.
Los elementos de transición al presentar sus capas parcialmente llenas, forman muchos compuestos coloreados y paramagnéticos como los complejos de níquel (II) que se observan en la imagen.
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