2021 Fiscal Year Annual Research Report
非線形光学特性および多色発光を示す多機能単分子磁石の構築
| Project/Area Number |
20J20245
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KUMAR Kunal 東京大学, 理学系研究科, 特別研究員(DC1)
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| Project Period (FY) |
2020-04-24 – 2023-03-31
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| Keywords | Pseudohalides / SHG / THz Absorption / Low Frequency Raman / SMM / Emission Thermometer / Excimer and Exciplex |
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| Outline of Annual Research Achievements |
I have prepared several pseudohalide containing complexes with general molecular formula [YbIII(TPPO)3(NCE)3] (E = S, YbS; Se, YbSe, TPPO = triphenylphosphine oxide), [NdIII(phen)3(NCX)3]-0.3EtOH (X = S, 1-S; Se, 1-Se), and [REIII(phen)2(μ-OH)2(H2O)2][AuI(SCN)2]2.phen.0.5MeCN.0.5H2O [REIII = Gd (GdAu2), Y (YAu2)] and [REIII(bpdo)4][AuI(SCN)2]3.MeCN [REIII = Gd (GdAu3), Y (YAu3)]. Compounds YbS and YbSe exhibit strong second harmonic generation behaviour and temperature-dependent emission. Similarly, 1-S and 1-Se have absorption below 1 THz due to their vibrational and have near-infrared emission. Compounds GdAu2, YAu2, GdAu3, and YAu3 have Au-Au stretching vibrations seen in the Raman scattering. They also exhibit strong luminescence originating from Au(I) centres.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Thanks to my last year's research on synthesizing precursors containing thiocyanide ligand. This year I mainly focused on preparing materials with pseudohalides (NCS-/NCSe-) showing high-performance behaviour. This included compounds having a strong second harmonic response as high as standard potassium diphosphate. I also discovered a complex with the absorption of terahertz light with a minimum frequency of 0.59 THz unique among molecular assemblies. Additionally, I included dimeric and trimeric bis(thiocyanide)gold(I) in two different lanthanide matrices for the first time. This allowed me to characterize the gold-gold stretching frequency and its variation upon cooling. We also investigated the photoluminescence of the Au(I) containing centres revealing a very high quantum yield.
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| Strategy for Future Research Activity |
In the last year's research, I prepared two compounds with the general formula [REIII(phen)2(μ -OH)2(H2O)2].[AuI(SCN)2]2.phen.0.5MeCN.0.5H2O [REIII = Gd (GdAu2), Y (YAu2)]. They reveal emission properties and Raman scattering related to the Au(I) centres. We will utilize this system to introduce Dy(III) ions. The Dy(III) containing compound is supposed to reveal emission and magnetic properties. Additionally, we plan to investigate its Raman thermometric behaviour as they have sharp Raman scattering in the low frequency region. Further, we will compare the thermometric sensitivity of Raman and emission spectroscopy. Further, we will plan to investigate the application of such a Raman thermometer to predict the phase transition temperature of unknown materials.
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