تقرير
The $^{103}$Rh NMR Spectroscopy and Relaxometry of the Rhodium Formate Paddlewheel Complex
| العنوان: | The $^{103}$Rh NMR Spectroscopy and Relaxometry of the Rhodium Formate Paddlewheel Complex |
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| المؤلفون: | Collins, Harry Harbor, Sabba, Mohamed, Moustafa, Gamal, Legrady, Bonifac, Soundararajan, Murari, Leutzsch, Markus, Levitt, Malcolm H. |
| سنة النشر: | 2023 |
| المجموعة: | Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Physics - Chemical Physics, Quantum Physics |
| الوصف: | The NMR spectroscopy of spin-1/2 nuclei with low gyromagnetic ratio is challenging, due to the low NMR signal strength. Methodology for the rapid acquisition of $^{103}$Rh NMR parameters is demonstrated for the case of the rhodium formate "paddlewheel" complex $\mathrm{Rh_2(HCO_2)_4}$. A scheme is described for enhancing the $^{103}$Rh signal strength by polarization transfer from $^{1}$H nuclei and which also greatly reduces the interference from ringing artifacts, a common hurdle for the direct observation of low-$\gamma$ nuclei. The $^{103}$Rh relaxation time constants $T_1$ and $T_2$ are measured within 20 minutes using $^{1}$H-detected experiments. The field-dependence of the $^{103}$Rh $T_1$ is measured. The high-field relaxation is dominated by the chemical shift anisotropy (CSA) mechanism. The $^{103}$Rh shielding anisotropy is found to be very large: $|\Delta\sigma|=9900\pm540\mathrm{\,ppm}$. This estimate is compared with density functional theory calculations. Comment: submitted to JCP |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2306.17457 |
| رقم الأكسشن: | edsarx.2306.17457 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |