研究目的
To investigate the effect of the chirality of counter anions on the vapochromic behavior of luminescent Pt(II) complexes, specifically comparing racemic and chiral forms.
研究成果
The chirality of the counter anion significantly affects the crystal structures and intermolecular Pt···Pt interactions in anhydrous states, leading to different emission properties. Both complexes exhibit reversible vapochromic behavior with MeOH and H2O vapor exposure, showing potential for applications in vapor sensing. Future work should explore broader systems and improve stability for practical use.
研究不足
The study is limited to specific Pt(II) complexes with tartrate counter anions; generalizability to other systems may be constrained. The instability of the complexes under light and the inability to measure emission quantum yields for MeOH-exposed forms due to instability under bright conditions are noted limitations. The crystal structure of the dihydrate 1-L complex was not determined, indicating a gap in structural understanding.
1：Experimental Design and Method Selection:
The study involved synthesizing Pt(II) complexes with chiral and racemic tartrate counter anions, followed by characterization using single crystal X-ray diffraction, powder X-ray diffraction, luminescence spectroscopy, UV-Vis spectroscopy, circular dichroism spectroscopy, thermogravimetric analysis, and IR spectroscopy to evaluate structural and emission properties.
2：Sample Selection and Data Sources:
Samples were synthesized from [PtCl(tpy)]Cl precursor with DL- or L-tartaric acid and LiOH in water, yielding yellow solids stored in dark conditions to prevent decomposition.
3：List of Experimental Equipment and Materials:
Equipment included Bruker D8 Advance diffractometer, JASCO FP-8600 spectrofluorometer, Shimadzu UV-2500PC spectrophotometer, JASCO J-820 circular dichroism spectrometer, Rigaku ThermoEvo TG-8120 analyzer, JASCO FT/IR-660 Plus infrared spectrometer, and Rigaku Mercury CCD diffractometer. Materials included Pt(II) complexes, tartaric acids, LiOH, solvents like H2O, DMSO, DMF, toluene, and tetrahydrofuran.
4：Experimental Procedures and Operational Workflow:
Synthesis involved dissolving tartaric acid and LiOH in water, adding to [PtCl(tpy)]Cl solution, filtering, washing, and drying. Single crystals were grown by vapor diffusion methods. Measurements included PXRD, emission spectra, UV-Vis, CD, TG, IR, and single crystal X-ray diffraction under controlled conditions.
5：Data Analysis Methods:
Data were processed using software like CrystalClear, CrysAlis Pro, SHELXT, SHELXL, and Olex2 for structural refinements and analysis.
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D8 Advance diffractometer
D8 Advance
Bruker
Used for powder X-ray diffraction studies to analyze crystal structures and phase purity.
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FP-8600 spectrofluorometer
FP-8600
JASCO
Used to measure luminescence spectra of the complexes.
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UV-2500PC spectrophotometer
UV-2500PC
Shimadzu
Used for UV-Vis absorption and diffuse reflectance spectroscopy.
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J-820 circular dichroism spectrometer
J-820
JASCO
Used to record circular dichroism spectra to confirm chirality.
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ThermoEvo TG-8120 analyzer
TG-8120
Rigaku
Used for thermogravimetric analysis to determine water content.
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FT/IR-660 Plus infrared spectrometer
FT/IR-660 Plus
JASCO
Used for IR spectroscopy to analyze molecular vibrations.
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Mercury CCD diffractometer
Mercury CCD
Rigaku
Used for single crystal X-ray diffraction measurements.
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C9920-02 absolute photoluminescence quantum yield spectrometer
C9920-02
Hamamatsu Photonics
Used to determine luminescence quantum yields.
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