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A 'passivated precursor' approach is developed for the efficient synthesis and isolation of all-alkynyl-protected gold nanoclusters. Direct reduction of dpa-passivated precursor Au-dpa (Hdpa=2,2'-dipyridylamine) in one-pot under ambient conditions gives a series of clusters including Au-22(C equivalent to CR)(18) (R=-C6H4-2-F), Au-36(C equivalent to CR)(24), Au-44(C equivalent to CR)(28), Au-130(C equivalent to CR)(50), and Au-144(C equivalent to CR)(60). These clusters can be well separated via column chromatography. The overall isolation yield of this series of clusters is 40 % (based on gold), which is much improved in comparison with previous approaches. It is notable that the molecular structure of the giant cluster Au-130(C equivalent to CR)(50) is revealed, which presents important information for understanding the structure of the mysterious Au-130 nanoclusters. Theoretical calculations indicated Au-130(C equivalent to CR)(50) has a smaller HOMO-LUMO gap than Au-130(S-C6H4-4-CH3)(50). This facile and reliable synthetic approach will greatly accelerate further studies on all-alkynyl-protected gold nanoclusters.
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CHEMISTRY-A EUROPEAN JOURNAL
ISSN: 0947-6539
Year: 2024
Issue: 42
Volume: 30
3 . 9 0 0
JCR@2023
CAS Journal Grade:3
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