Induced fac - mer rearrangements in {M(CO) 3 } + complexes (M = Re, 99(m) Tc) by a PNP ligand.

The fac - mer rearrangements in [MX 3 (CO) 3 ] 2- (M = Re, 99 Tc) induced by a pincer-type ligand (PNP) and a "halide scavenger" are reported. The reactions of fac -[ 99m Tc(CO) 3 (OH 2 ) 3 ] + or [ 99m TcO 4 ] - in saline both yield mer -[ 99m Tc(PNP)(CO) 3 ] + , the first example of a mer -{ 99m Tc(CO) 3 } + type complex. In contrast, reactions with terpyridine (terpy) only gave the facial κ 2 -terpy complexes with Re and 99 Tc.