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What is the geometry for [Pt(NH3)4I2][PtI4]

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To understand the geometry of the complex [Pt(NH3)4I2][PtI4], we first need to break down the components of this coordination compound:

  1. [Pt(NH3)4I2]: This part consists of a platinum(II) center coordinated to four ammine (NH3) ligands and two iodide (I) ligands. The geometry around the Pt in this part is best described as octahedral due to the six coordination sites (4 from NH3 and 2 from I).

  2. [PtI4]: This part contains a platinum(II) center coordinated to four iodide ions. The geometry for this complex is also square planar, which is a common geometry for platinum complexes with a coordination number of 4.

Putting it all together, we have a complex that consists of an octahedral coordination around one platinum center ([Pt(NH3)4I2]) and a square planar geometry around another platinum center ([PtI4]).

In summary:

  • [Pt(NH3)4I2]: Octahedral geometry
  • [PtI4]: Square planar geometry

The compound overall exhibits a mixed valence character and showcases aspects of both geometries.