predict the geometries of the complexes from these reactions:
1- [pt(NO2)cl3)]2- + NH3 --> [pt(NO2)(NH3)cl2]-1 +cl-
2-cis-[pt(RNH2)2(NH3)(NO2)]+1 + cl- --> Pt(RNH2)(NH3)(NO2)Cl + RNH2
To predict the geometries of the complexes in these reactions, we need to understand the concept of coordination geometry. Coordination geometry refers to the spatial arrangement of ligands around a central metal atom or ion in a complex.
1. [Pt(NO2)Cl3)]2- + NH3 → [Pt(NO2)(NH3)Cl2]-1 + Cl-
To predict the geometry of the complex, we need to determine the number of ligands attached to the central metal atom and their spatial arrangement. Let's analyze each complex:
a) [Pt(NO2)Cl3)]2- (reactant): This complex has a platinum (Pt) central atom bonded to three chloride (Cl) ions and one nitro (NO2) ligand. The coordination number (total number of ligands attached to the central atom) is four. The geometry of this complex is tetrahedral.
b) [Pt(NO2)(NH3)Cl2]-1 (product 1): In this complex, one of the chloride ions is replaced by an ammonia (NH3) ligand. The coordination number remains four, and the geometry of the complex is still tetrahedral.
c) Cl- (product 2): This is a free chloride ion and has no coordination around it.
2. cis-[Pt(RNH2)2(NH3)(NO2)]+1 + Cl- → Pt(RNH2)(NH3)(NO2)Cl + RNH2
a) cis-[Pt(RNH2)2(NH3)(NO2)]+1 (reactant): This complex has a platinum (Pt) central atom bonded to two amine (RNH2) ligands, one ammonia (NH3) ligand, and one nitro (NO2) ligand. The coordination number is four, and the geometry of this complex is square planar due to the presence of two large groups (RNH2) on adjacent positions.
b) Pt(RNH2)(NH3)(NO2)Cl (product): In this complex, one of the amine (RNH2) ligands is replaced by a chloride (Cl) ligand. The coordination number remains four, but now the geometry of the complex is distorted square planar.
c) RNH2 (product): This is a free amine molecule.
Note that the terms "cis" and "trans" refer to the relative arrangement of different ligands around the central metal atom. In the given reaction, the reactant cis-[Pt(RNH2)2(NH3)(NO2)]+1 has a cis- arrangement of ligands, while the product Pt(RNH2)(NH3)(NO2)Cl has a distorted square planar geometry.
By analyzing the ligands and their coordination numbers, we can predict the geometries of the complexes in these reactions.