Table 2. Second-Order Rate Constants^a and Activation Parameters for the Reactions of [PtMe₂(pbt)], 1a, [PtMe(PPh₂Me)(ppy)], 1b, and [PtMe(PPh₂Me)(bhq)], 1c, with PhCH₂Br in Acetone.

		k2/L mol–1 s–1 at different temperatures
complex	λmax/nm	10 °C	20 °C	25 °C	30 °C	40 °C	ΔH‡/kJ mol–1	ΔS‡/J Kmol–1
1ab	520, (562)	7.66, (0.38)	10.44, (0.47)	11.95, (0.63)	14.29, (0.75)	21.47, (1.17)	22.5 ± 1.7, (31.5 ± 1.1)	–148 ± 6, (−143 ± 4)
		102 k2/L mol–1 s–1 at different temperatures
		15 °C	20 °C	25 °C	30 °C	40 °C
1bc	358	0.10	0.15, [3.75]	0.20, [5.05]	0.31, [6.55]	0.51, [11.00]	45.9 ± 2.0, [38.2 ± 0.4]	–142 ± 7, [−141 ± 2]
1c	390	0.51d	0.83e	0.31	0.39	0.61	35.8 ± 1.7	–172 ± 6

^aEstimated errors in k₂ values are ±5%.

^bValues in parenthesis are for toluene.

^cValues in brackets are for MeI.

^dAt 35 °C.

^eAt 45 °C.