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Table 2

From: Interaction of 2-aminopyrimidine with dichloro-[1-alkyl-2-(naphthylazo) imidazole]palladium(II) complexes : Kinetic and mechanistic studies

Pd(N,N/)Cl2 Temperature (K) k2 (dm3 mol-1 s-1) ΔH° (kJ mol-1) ΔS° (J K-1mol -1)
1a 293 2.03 29.12 -139.51
  298 2.53   
  303 3.12   
  308 3.82   
  313 4.66   
1b 293 1.80 33.84 -124.46
  298 2.24   
  303 2.93   
  308 3.69   
  313 4.62   
1c 293 2.31 23.30 -158.38
  298 2.68   
  303 3.26   
  308 3.84   
  313 4.50   
2a 293 3.38 14.44 -185.32
  298 3.85   
  303 4.26   
  308 4.76   
  313 5.30   
2b 293 3.18 21.16 -162.87
  298 3.85   
  303 4.41   
  308 5.14   
  313 5.98   
2c 293 3.82 9.52 -201.16
  298 4.13   
  303 4.49   
  308 4.85   
  313 5.23   
  1. Second order rate constants (k2) at different temperatures and activation parameters for the reactions of 2-aminopyrimidine with dichloro-{1-alkyl-2-(α-naphthylazo) imidazole}palladium(II) (1) and dichloro-{1-alkyl-2-(β-naphthylazo)imidazole} palladium(II) (2)complexes where the alkyl R = Me(a), Et(b), or Bz(c) in MeCN : [Pd(N,N/)Cl2]0 = 1.0 × 10-4 mol dm-3, [2-NH2- Pym]0 = 1.0 × 10-3 mol dm-3.