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Core-Size Conversion of Au38(SCH2CH2Ph)24 to Au30(S–tBu)18 Nanomolecules

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journal contribution
posted on 05.07.2017, 15:49 by Milan Rambukwella, Luca Sementa, Alessandro Fortunelli, Amala Dass
Au38(SCH2CH2Ph)24 nanomolecules upon etching with tert-butylthiol undergo core-size conversion to green-gold Au30(S–tBu)18 via Au36(SCH2CH2Ph)24‑x(S–tBu)x intermediate. The structural transformation from Au38 to Au30 indicates a strong steric effect due to the tert-butyl group of the exchanging ligand in contrast to electronic effect by ligands such as thiophenol, which transforms the Au38(SCH2CH2Ph)24 to Au36(S–tBu)24. In this work, fast reaction kinetics were observed and thermodynamically stable Au30(S–tBu)18 was obtained in molecular purity.