Solid-state NMR of unreceptive nuclei

固体核磁共振是在分子水平上探测固体材料的结构和动力学的最强大的技术之一。虽然大多数核磁共振用于有机分子中元素的同位素(例如，1H、13C、15N等)，但也可以研究许多其他具有核磁共振活性的核素。我们的研究小组专门研究了整个元素周期表中的核素的SS核磁共振，包括自旋1/2的核(如89Y，109Ag，195Pt，207Pb等)。和四极(自旋&GT；1/2)核(如14N，35Cl，49Ti，65Cu，91Zr)；后一类约占元素周期表中具有核磁共振活性的核的73%。这些核中的许多被归类为不可接受的，这意味着它们的研究非常具有挑战性，因为(1)低的核磁共振频率，(2)低的自然丰度，(3)大的各向异性核磁共振相互作用产生的广泛模式，(4)不方便的弛豫特性或(5)它们的组合。

Solid-state nuclear magnetic resonance (SSNMR) is one of the most powerful techniques available for probing structure and dynamics in solid materials at the molecular level. While the majority of NMR is applied to isotopes of elements found in organic molecules (e.g., 1H, 13C, 15N, etc.), there are many other NMR-active nuclides that can be investigated. Our research group specializes in SSNMR of nuclides across the periodic table, including spin-1/2 nuclei (e.g., 89Y, 109Ag, 195Pt, 207Pb, etc.) and quadrupolar (spin > 1/2) nuclei (e.g., 14N, 35Cl, 49Ti, 65Cu, 91Zr); this latter category constitutes ca. 73% of the NMR-active nuclei in the periodic table. Many of these nuclei are classified as unreceptive, meaning that they are very challenging to study due to (i) low NMR frequencies, (ii) low natural abundance (iii) broad patterns arising from large anisotropic NMR interactions, (iv) inconvenient relaxation characteristics or (v) combinations thereof.