Crystal Structure and Optical Properties of Cd ₃₂ S ₁₄ (SC ₆ H ₅ ) ₃₆ . DMF ₄ , a Cluster with a 15 Angstrom CdS Core

Abstract

Recrystallization of the solid Cd(10)S(4)(SC(6)H(5))(12) from a solution of pyridine and N, N-di-methylformamide (DMF) results in the formation of the cluster Cd(32)S(14)(SC(6)H(5))(36)-DMF(4) as pale yellow cubes. The structure consists of an 82-atom CdS core that is a roughly spherical piece of the cubic sphalerite lattice approximately 12 angstroms in diameter. The four corners of the lattice are capped by hexagonal wurtzite-like CdS units, which results in an overall tetrahedral cluster approximately 15 angstroms in diameter. This cluster dissolves intact in tetrahydrofuran where its absorption spectrum reveals a sharp peak at 358 nanometers at room temperature and its emission spectra show a strong broad band at 500 nanometers.

CdS Magic-Sized Nanocrystals Exhibiting Bright Band Gap Photoemission via Thermodynamically Driven Formation

“…A well-characterized nanocluster of Cd 32 S 50 was reported to have a CdS core with 82 atoms and the overall size of 1.5 nm, while exhibiting band gap absorption peaking at 358 nm. 27 Family 378 should contain more Cd and S atoms with its size larger than 1.5 nm.…”

Synthesis of Zinc Sulfide Nanocrystals and Fabrication of Nanocrystal Superlattice

“…These figures reveal the formation of irregular shape NCs. The S-Zn-thiol precursors, which are so-called ''Herron's or Dance's cluster compounds'', 9,10) were also examined. To synthesize S-Zn-thiol precursors, sulfur powder was added to Zn/dodecanethiol system.…”

Synthesis and Characterization of a Size Series of Extremely Small Thiol-Stabilized CdSe Nanocrystals

“…An important landmark in the development of wet chemical routes for cadmium chalcogenide nanocrystals was, together with the nonaqueous TOP/TOPO (trioctyl phosphine /trioctyl phosphine oxide) technique, 3 the use of different thiols as stabilizing agents in aqueous solution. [4][5][6] A monodisperse size series of thioalcohol-stabilized CdS 7 and CdTe 8 nanoparticles with extremely small sizes (1-3 nm size range) was synthesized in aqueous solutions and was obtained in the gram scale as redissolvable nanocrystalline powders or as crystals of nanoclusters (superstructures). 9,10 To complete the series of thiolstabilized cadmium chalcogenide nanocrystals synthesized by a wet chemical route in aqueous solution, CdSe nanoparticles were synthesized.…”