Solution and Solid-State Characterization of PbSe Precursors

Abstract

The addition of lead to diphenyl diselenide in ethylenediamine (en) or pyridine (py) allowed for the observation of the solvento complexes, (en)­Pb­(SePh)2 or (py)2Pb­(SePh)2, respectively. Performing this reaction in dimethyl sulfoxide and subsequent crystallization was found to afford Pb­(SePh)2. Inductively coupled plasma optical emission spectroscopy revealed a 1:2 lead to selenium ratio for all three complexes. Nuclear magnetic resonance spectroscopy confirms that Pb­(SePh)2 is readily solubilized by ethylenediamine, and electrospray ionization mass spectrometry supports the presence of Pb­(SePh)2 moieties in solution. Single-crystal X-ray diffraction analysis of the pyridine adduct, (py)2Pb­(SePh)2, revealed a seesaw molecular geometry featuring equatorial phenylselenolate ligands. Crystals of Pb­(SePh)2 grown from dimethyl sulfoxide revealed one-dimensional polymeric chains of Pb­(SePh)2. We believe that the lead­(II) phenylselenolate complexes form via an oxidative addition reaction.

Kinetics and mechanistic details of bulk ZnO dissolution using a thiol–imidazole system

“…26 This chemistry was expanded to include the dissolution of other zero-valent bulk transition metals including Fe, Mg, Mn, Ni and Zn, [27][28][29] and has been recently revisited for the oxidative dissolution of metallic Pb and Sn using molecular dichalcogenides. 30,31 In the particular case of metallic Zn powder, dissolution occurs via addition of N-donor solvents and elemental sulfur to yield a dened molecular solute, which is a pseudo-tetrahedral ZnS 6 (L) 2 complex (where L ¼ 1/2 tetramethylethylenediamine, 4-(dimethylamino)pyridine). These complexes can be thermally annealed under nitrogen to yield ZnS.…”