| Autor: |
Kumar P; Department of Chemistry, Central University of Punjab, Bathinda 151401, India., Khirid S; Department of Chemistry, Central University of Punjab, Bathinda 151401, India., Jangid DK; Department of Chemistry, Central University of Punjab, Bathinda 151401, India., Nishad CS; Department of Chemistry, Central University of Punjab, Bathinda 151401, India., Chauhan P; Department of Physics, Central University of Punjab, Bathinda 151401, India., Kumari P; Department of Chemistry, Central University of Punjab, Bathinda 151401, India., Meena S; Department of Chemistry, Central University of Punjab, Bathinda 151401, India., Bose SK; Centre for Nano and Material Sciences (CNMS), Jain (Deemed-to-be-University), Jain Global Campus, Bangalore 562112, India., Kumar A; Department of Physics, Central University of Punjab, Bathinda 151401, India., Banerjee B; Department of Chemistry, Central University of Punjab, Bathinda 151401, India., Dhayal RS; Department of Chemistry, Central University of Punjab, Bathinda 151401, India. |
| Abstrakt: |
The structure-property relationship considering isomerism-tuned photoluminescence and efficient catalytic activity of silver nanoclusters (NCs) is exclusive. Asymmetrical dithiophosphonate NH 4 [S 2 P(OR)( p -C 6 H 4 OCH 3 )] ligated first atomically precise silver NCs [Ag 21 {S 2 P(OR)( p -C 6 H 4 OCH 3 )} 12 ]PF 6 {where, R = n Pr ( 1 ), Et ( 2 )} were established by single-crystal X-ray diffraction and characterized by electrospray ionization mass spectrometry, NMR ( 31 P, 1 H, 2 H), X-ray photoelectron spectroscopy, UV-visible, energy-dispersive X-ray spectroscopy, Fourier transforms infrared, thermogravimetric analysis, etc. NCs 1 and 2 consist of eight silver atoms in a cubic framework and enclose an Ag@Ag 12 -centered icosahedron to constitute an Ag 21 core of T h symmetry, which is concentrically inscribed within the S 24 snub-cube, P 12 cuboctahedron, and the O 12 truncated tetrahedron formed by 12 dithiophosphonate ligands. These NCs facilitate to be an eight-electron superatom (1S 2 1P 6 ), in which eight capping Ag atoms exhibit structural isomerism with documented isoelectronic [Ag 21 {S 2 P(O i Pr) 2 } 12 ]PF 6, 3 . In contrast to 3 , the stapling of dithiophosphonates in 1 and 2 triggered bluish emission within the 400 to 500 nm region at room temperature. The density functional theory study rationalized isomerization and optical properties of 1 , 2 , and 3 . Both ( 1 , and 2 ) clusters catalyzed a decarboxylative acylarylation reaction for rapid oxindole synthesis in 99% yield under ambient conditions and proposed a multistep reaction pathway. Ultimately, this study links nanostructures to their physical and catalytic properties. |
