Molecular and polymeric Hg(II) complexes with a PTA (1,3,5-triaza-7-phosphaadamantane) complex of the [Re6(μ3-Se)8]2+ core-containing cluster as ligand

Two Hg(II) complexes with the cluster-complex ligand [Re6(μ3-Se)8(PEt3)5(PTA)](SbF6)2 (PTA = 1,3,5-triaza-7-phosphaadamantane), {[Re6(μ3-Se)8(PEt3)5(PTA)(Hg3I7)](SbF6)}n·(CH3CN)n (1) and {[Re6(μ3-Se)8(PEt3)5(PTA)]2(Hg4I9)}(SbF6)3·2CH3CN (2), were prepared and structurally characterized. The two compounds were obtained from reactions conducted at different temperatures under otherwise identical conditions. Recrystallization of the room-temperature product 2 in a different solvent mixture produced yet another new Hg(II) complex, {[Re6(μ3-Se)8(PEt3)5(PTA)](Hg3I8)}·CH3CN (3) which may be considered as a consequence of the dissociation of the kinetic product 2 in solution and the re-assembly of necessary components to generate the new compound upon crystallization. The solid-state structure of 1 contains polymeric cluster columns, in which the PTA ligand adopts a hitherto unknown coordination mode with simultaneous coordination of all four (one P and three N atoms) potentially coordinating atoms.