Kinetic and Mechanistic Studies on the Interaction of Glycyl-L-alanine, Glycyl-L-asparagine, and Glycyl-L-tyrosine with Hydroxopentaaquarhodium(III) Ion

Table 1

10³𝑘_1(obs) (s⁻¹) values for different dipeptide concentrations at different temperatures; [Complex A] = 2.5 × 10⁻⁴ mol dm⁻³, pH = 4.3, ionic strength = 0.1 mol dm⁻³ NaClO₄.

Ligand	Temperature (°C )	10^3 [Ligand] (mol dm^−3)
		2.50	3.75	5.00	6.25	7.50
L^1-L′H	50	2.23	2.77	3.07	3.37	3.69
	55	2.75	3.32	3.81	4.14	4.33
	60	3.19	3.95	4.42	4.47	5.15
	65	3.77	4.67	5.16	5.62	6.09
L^2-L′H	50	0.52	0.69	0.81	0.92	1.01
	55	0.72	0.93	1.10	1.23	1.35
	60	0.98	1.28	1.47	1.64	1.82
	65	1.27	1.59	1.85	2.08	2.27
L^3-L′H	50	1.53	1.90	2.15	2.33	2.46
	55	2.03	2.49	2.83	3.05	3.15
	60	2.57	3.11	3.45	3.66	3.80
	65	3.21	3.83	4.27	4.52	4.69