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NMR Study of Semiconductor Molecular Clusters

1988; American Physical Society; Volume: 60; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.60.2673

1092-0145

A. M. Thayer, Michael L. Steigerwald, T. Michael Duncan, D. C. Douglass,

Spectroscopy and Quantum Chemical Studies

Three sizes of CdSe molecular clusters were studied by $^{77}\mathrm{Se}$ NMR spectroscopy. The clusters are synthesized via arrested precipitation in a structured medium and are isolated as a molecular solid after modification of their surfaces with covalently attached organic ligands. While one component of the broad $^{77}\mathrm{Se}$ NMR line shape corresponds to the bulk material, increasing proportions appear at shifts upfield as a function of decreasing particle size. The line positions and distribution of chemical shifts can be related to a size dependence of the electronic structure and the local chemical environments.