Abstract
Reaction of 2,4,6-tris(2-pyrimidyl)-1,3,5-triazine (TPymT) with Pb(NO3)(2) in aqueous medium leads to the formation of a mixture of two pseudopolymorphs, {[Pb-2(TPymT)(H2O)(NO3)(4)].H2O}(n), 1 and [Pb-2(TPymT)(NO3)(4)](n), 2, where TPymT molecules are coordinated with two Pb-II ions in a bridging bis-terpyridine fashion. We demonstrate that fast evaporation of the solvent leads exclusively to the formation of 1, while 2 was formed upon slow evaporation. The two pseudopolymorphs can be interconverted by dissolving in water upon heating and controlling the evaporation rate.