Synthesis of selenolate-protected Au18(SeC6H5)14 nanoclusters

Abstract

This work reports the first synthesis of selenophenolate-protected Au(18)(SePh)(14) nanoclusters. This cluster exhibits distinct differences from its thiolate analogue in terms of optical absorption properties. The Au(18)(SePh)(14) nanoclusters were obtained via a controlled reaction of Au(25)(SCH(2)CH(2)Ph)(18) with selenophenol. Electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS) revealed the crude product to contain predominantly Au(18)(SePh)(14) nanoclusters, and side products include Au(15)(SePh)(13), Au(19)(SePh)(15) and Au(20)(SePh)(16). High-performance liquid chromatography (HPLC) was employed to isolate Au(18)(SePh)(14) nanoclusters. The results of thermogravimetric analysis (TGA), elemental analysis (EA), and (1)H/(13)C NMR spectroscopy confirmed the cluster composition. To the best of our knowledge, this is the first report of selenolate-protected Au(18) nanoclusters. Future theoretical and X-ray crystallographic work will reveal the geometric structure and the nature of selenolate-gold bonding in the nanocluster.

Eight‐Electron Silver and Mixed Gold/Silver Nanoclusters Stabilized by Selenium Donor Ligands

“…Abstract: The first atomically and structurally precise silvernanoclusters stabilized by Se-donor ligands,[ Ag 20 {Se 2 P-(O i Pr) 2 (5). Structures of 3, 4,a nd 5 were determined by single-crystal X-raydiffraction.…”

“…[4] Zhu and co-workers reported selenophenolateprotected Au 25 and Au 18 NCs,which possess different optical properties from those of the Au n (SR) m counterparts. [5] Studies on the atomically precise Au 24 (SeR) 20 and Au 24 (SR) 20 revealed largely different structures and optical properties. [6] These reports raise al egitimate question concerning nanoparticle stability and related properties on the silver NCs stabilized by selenolate ligands in comparison with their thiolate counterparts.T hough there are several reported mixed-valent silver clusters containing Ag 0 , [3b,c, 7] thiolateprotected homoleptic silver NCs characterized by singlecrystal X-ray diffraction are scarce (Ag 20 ,Ag 21, Ag 25 ,Ag 44 ).…”

“…As diselenophosphates are easily oxidized under aerobic conditions and decompose rapidly via PÀSe bond cleavages in the presence of excess amount of reducing reagents, [14] the direct synthetic procedure adopted for the preparation of Ag 20 (dtp) 12 (5), where agold atom occupies the center of the silver-capped icosahedron. Cluster 5 is also the first structurally characterized alloy cluster completely covered by aSes hell.…”

Eight‐Electron Silver and Mixed Gold/Silver Nanoclusters Stabilized by Selenium Donor Ligands

“…[1][2][3] Recent works have discussed the great probability of making new stable functional nanomaterials by replacing the thiolate ligands on the gold surface with selenolates.Negishi et al first reported adirect synthesis of Au 25 (SeC 8 H 17 ) 18 À from the gold salt as well as the preparation of Au 38 (SeC 12 H 25 ) 24 by ligand exchange on Au 38 -(SR) 24 . [5] Studies on the atomically precise Au 24 (SeR) 20 and Au 24 (SR) 20 revealed largely different structures and optical properties. [5] Studies on the atomically precise Au 24 (SeR) 20 and Au 24 (SR) 20 revealed largely different structures and optical properties.…”

Size‐dependent electrophoretic migration and separation of water‐soluble gold nanoclusters by capillary electrophoresis

“…The researchers have done a lot of improvements of the properties of AuNCs, especially AuNCs with different ligands. In general, the ligands for AuNCs include thiolate , phosphines and selenates , etc. Many studies have demonstrated that ligands play a key role in the structure and properties of AuNCs.…”