Question

IR active stretching vibrations of isomers of (Pt(NH3)2Cl2)

Answer 1

N-H Stretching, O-H stretching, and IR waves are 350cm⁻¹

Explanation:

• Asymmetric environmental effects lead to several spectral features observed in experiments, such as the blue-shift in the N-H stretching region and the frequency splitting of NH3 symmetric deformation modes.
• Furthermore, a similar decoupling and localization of several vibrational modes of cisplatin is found in the solid phase and aqueous solution, in comparison to those of O-H stretching modes of water molecules in liquid water
• One can determine which isomer (cis or trans) is present in a sample from the IR spectrum by  determining the contribution to the spectrum of the Pd-Cl stretching modes for both the cis and trans  complexes.
• The trans isomer exhibits a single Pd-Cl stretching vibration (νPd-Cl) around 350 cm⁻¹, while the cis  isomer exhibits two stretching modes.

            [Pt(NH3)2Cl2] can exist as two geometric isomers:

                          Cis and trans