1 research outputs found
Excited State Engineering in Ag<sub>29</sub> Nanocluster through Peripheral Modification with Silver(I) Complexes for Bright Near-Infrared Photoluminescence
The optical property of an ionic metal nanocluster (NC)
is affected
by the ionic interaction with counter ions. Here, we report that the
modification of trianionic [Ag29(BDT)12(TPP)4]3– NC (BDT: 1.3-benzenedithiol; TPP: triphenylphosphine)
with silver(I) complexes led to the intense photoluminescence (PL)
in the near-infrared (NIR) region. The binding of silver(I) complexes
to the peripheral region of Ag29 NC is confirmed by the
single-crystal X-ray diffraction (SCXRD) measurement, which is further
supported by electrospray ionization mass spectrometry (ESI-MS) and
nuclear magnetic resonance (NMR) spectroscopy. The change of excited-state
dynamics by the binding of silver(I) complexes is discussed based
on the results of a transient absorption study as well as temperature-dependent
PL spectra and PL lifetime measurements. The modification of Ag29 NCs with cationic silver(I) complexes is considered to give
rise to a triplet excited state responsible for the intense NIR PL.
These findings also afford important insights into the origin of the
PL mechanism as well as the possible light-driven motion in Ag29-based NCs