Coordination chemistry of Group 12 metals with phosphorodiselenoates: syntheses, structures and VT 31P NMR study of monomer–dimer exchange equilibrium

Synthesis and characterization of [Pb{Se2P(OiPr)2}2]n pseudo polymorphs: polymeric, single source precursor enabling preparation of shape-controlled lead selenide structures

Novel lead pseudo polymorphs supported by diselenophosphate (dsep) ligands, [Pb{Se(2)P(O(i)Pr)(2)}(2)](n) (1alpha and 1beta), were synthesized and structurally characterized. The two structures differed in the binding modes of the dsep ligand. Each repeating unit in 1alpha was composed of a lead atom coordinated by two dsep ligands, one in a chelating mode and the other in a bridging-dangling mode. By contrast, the dsep ligands in 1beta adopted a bimetallic-biconnective (mu(1)-S, mu(1)-S) binding pattern. The bridging-dangling mode observed in 1alpha is the first example of this mode for the dsep ligand. [Pb{Se(2)P(O(i)Pr)(2)}(2)](n) could be successfully utilized as a single source precursor (SSP) for growing lead selenide (PbSe) nanostructures with different shapes via the solvothermal process. The morphologies of the as-grown PbSe structures were controlled by capping agents, poly(vinyl pyrrolidone) (PVP) and ethylenediamine, both bind on the {200} plane and enhance the growth rate of the <111> direction of the PbSe crystals, resulting in the formation of cubes and eight-horned rod dendrites, respectively. Raman spectroscopy was utilized to investigate the phonon vibration behaviour of the as-grown eight-horned rod dendrites. All peaks in the Raman spectra can be attributed to longitudinal (LO) and transverse (TO) optical phonon modes of the PbSe rod dendrites.

Metal thiophosphonates and related compounds: an emerging area of supramolecular coordination chemistry

Nine new compounds containing PS ligands of the types [P(OtBu)S3]2-, [ArP(StBu)S2]- and [ArP(OtBu)S2]- are reported (Ar = 4-anisyl). It is demonstrated that the topology of alkali metal ion and ligand composition influence the structure of supramolecular arrangements.