Kinetic and High-Pressure Mechanistic Investigation of the Aqua Substitution in the Trans-Aquaoxotetracyano Complexes of Re(V) and Tc(V): Some Implications for Nuclear Medicine

Table 2

Comparative table for the kinetic data and activation parameters for the ligation reactions of [ReO(OH₂)(CN)₄]⁻ and [TcO(OH₂)(CN)₄]⁻ at 25^°C. ^(a)Refrences [37, 48], ^(b)this work.

Parameter	Metal	NCS^−	NNDMTU	NMTU	TU	HN3
(M^-1 s^-1)	Re^(a)	0.00348(4)	0.059(2)	0.067(2)	0.0399(9)	0.0064(2)
	Tc^(b)	22.2(3)^(a)	11.5(4)	11.38(4)	7.4(1)	—
Tc/Re	—	6321	195	170	185	—
(J K^-1 mol^-1)	Re^(a)		(40)	(10)	(3)	(6)
	Tc^(b)	(12)	(8)	(11)	(17)	—
(kJ mol^-1)	Re^(a)	17.4(1.9)	45(11)	42(3)	52(1)	60(2)
	Tc^(b)	62(4)	55(2)	42(3)	35(5)	—
(cm^3 mol^-1)	Re^(b)	(3)	—	—	(9)	—
	Tc^(b)	(3)	(1)	—	(5)	—