Write the coordination number and geometry for [Pt(NH3)4I2][PtI4].

Answer 1

To determine the coordination number and geometry of the complexes [Pt(NH3)4I2] and [PtI4], we can analyze their structures separately.

1. [Pt(NH3)4I2]:

   • Coordination Number: In this complex, platinum (Pt) is coordinated to four ammonia (NH3) ligands and two iodide (I) ligands. Therefore, the total coordination number is 6 (4 from NH3 and 2 from I).
   • Geometry: A coordination number of 6 typically results in an octahedral geometry.

2. [PtI4]:

   • Coordination Number: In this complex, platinum is coordinated to four iodide (I) ligands. Thus, the coordination number is 4.
   • Geometry: A coordination number of 4 typically leads to a square planar geometry for transition metal complexes, especially with d8 metal centers like platinum.

In summary:

• [Pt(NH3)4I2]: Coordination number = 6, Geometry = Octahedral.
• [PtI4]: Coordination number = 4, Geometry = Square Planar.