Abstract
A simple and rapid method for (18) F radiolabelling of [GaF(3) (BnMe(2) -tacn)] by (18) F/(19) F isotopic exchange is described. The use of MeCN/H(2) O or EtOH/H(2) O (75:25) and aqueous [(18) F]F(-) (up to 200 MBq) with heating (80 °C, 10 min) gave 66±4 % (18) F incorporation at a concentration of 268 nm, and 37±5 % (18) F incorporation at even lower concentration (27 nm), without the need for a Lewis acid promoter. A solid-phase extraction method was established to give [Ga(18) F(19) F(2) (BnMe(2) -tacn)] in 99 % radiochemical purity in an EtOH/H(2) O mixture.