Mn2+-doped amino lead halide molecular clusters (MCs)
are synthesized using amine (e.g., n-octylamine,
or butylamine) as passivating ligand and MnX2 (X = Cl or
Br) as the Mn2+ doping source at room temperature. Their
optical properties are investigated with UV–visible absorption,
photoluminescence (PL), and PL excitation spectroscopy. The Mn2+ precursor plays a vital role in the synthesis of Mn2+-doped MCs. MnCl2 seems to facilitate the incorporation
of Mn. The MnCl2 doping causes electronic absorption blue
shift and leads to a spin-forbidden 4T1 → 6A1 Mn d-electron emission. With the help of time-resolved
PL, Fourier transform infrared, and electron paramagnetic resonance
results, a model is proposed to explain the formation mechanism. We
suggest that Mn2+ doping replaces Pb2+ is assisted
by Cl– ions that replace Br– ions.
This study demonstrates the possibility of doping MCs and has important
implications in gaining new fundamental insight into the growth mechanisms
of perovskite nanostructures.
A novel carboxyl-bonded silica stationary phase was prepared by "thiol-ene" click chemistry. The resultant Thiol-Click-COOH phase was evaluated under hydrophilic interaction liquid chromatography (HILIC) mobile phase conditions. A comparison of the chromatographic performance of Thiol-Click-COOH and pure silica columns was performed according to the retention behaviors of analytes and the charged state of the stationary phases. The results indicated that the newly developed Thiol-Click-COOH column has a higher surface charge and stronger hydrophilicity than the pure silica column. Furthermore, the chromatographic behaviors of five nucleosides on the Thiol-Click-COOH phase were investigated in detail. Finally, a good separation of 13 nucleosides and bases, and four water-soluble vitamins was achieved.
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