Question

2. Consider the following substitution reactions: Ni(en)2Cl2 2 H20 [Ni(OH2)2(en)2] Cl2 Ni(deen)2Cl2 +2 H20INi(deen)2(0H:2}2] Cl2 where deen N, N-diethylenediamine (CH3CH2)2NCH2CH2N H2 Identify which of the two you would expect to have a faster rate and clearly explain your logic. For full credit on your explanation include comment(s) on the RDS.

Answer 1

Ni ken)2 ce2 t 2, o u Ce LO 1 HHTT Ni \H Ni(deen)u 2 Ni de), o) Et Et Ni 1 Et Et Ehylevadiamine (en) frm mone stalaler tomplex es with metal than the snbstited ethylenediaminen (deen). Snbshittion atN-untre (ii-Et ronp) increans basicity but at the same time, alro inereases significant amowt o sterie Tepulsion which domintes over the Fon this Jueeom, less stable N (den Substi htion seaction at aster sate companed undergaes compandto mere stableNi(en)

This problem is actually based on stability of chelate complexes. en and deen both are chelating ligand,