| Abstract
| - Precursors to synthesize lanthanide sulfide materials have been structurally characterized. The thermal properties have been investigated to determine their utility as a single-source precursor for the synthesis of bulk materials and nanoparticle. The mechanism of thermal decomposition has been determined for the europium dithiocarbamate and has been shown to form crystalline EuS.
- We have synthesized a series of lanthanide dithiocarbamate precursors for the synthesis of lanthanidesulfide materials and nanoparticles. Three dithiocarbamate complexes with europium, [Eu(S2CNRR‘)3L],where L = 1,10-phenanthroline, and R = methyl, R‘ = ethyl (1), R = R‘ = nPropyl (2), and R =R‘ = iButyl (3), as well as the lanthanide complexes, [Ln(S2CNR2)3 L], where R = ethyl, L = 1,10-phenanthroline, and Ln = Nd (4), Sm (5), Gd (6), Ho (7), and Er (8), were synthesized and characterizedby single-crystal X-ray diffraction, infrared, NMR, and UV−visible spectroscopy. We have used thermalanalysis coupled with GC−MS and X-ray powder diffraction to determine the mechanism ofdecomposition. With R = Et, smaller Ln ions give lower precursor decomposition temperatures, consistentwith the higher lattice energies of the product Ln sulfides. Because they are monomeric, and water- andair-stable, these compounds should be ideal precursors for forming LnS as nanoparticles and bulk materials.
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