Renaissance of the coordination chemistry of 2,4,6-tris(2-pyrimidyl)-1,3,5-triazine (TPymT). Part II: new insights into the reaction of TPymT with Pb(NO3)2

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, {[Pb₂(TPymT)(H₂O)(NO₃)₄]·H₂O}_n, 1 and [Pb₂(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.