Topic
Nuclear quadrupole resonance
About: Nuclear quadrupole resonance is a research topic. Over the lifetime, 3531 publications have been published within this topic receiving 38801 citations. The topic is also known as: Nuclear quadrupole resonance spectroscopy & NQR.
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TL;DR: In this paper, a review of the field of paramagnetic metal complex analysis is presented, with a focus on the magnetic resonance techniques used for the analysis of the metdl-and bondmg in tranatlon metal complexes.
13 citations
TL;DR: In this paper, a superconducting quantum interference device (SQUID) is used to detect small NMR signals via cross relaxation of the 14 N polarization to adjacent proton spins, eliminating the need for field cycling.
13 citations
13 citations
TL;DR: In this article, a proton nuclear magnetic double resonance was used to obtain a quadrupole coupling constant of 3.79 MHz for 25Mg and 1.81 MHz for 14N ligands.
Abstract: 25Mg and 14N zero field nuclear quadrupole resonance are observed in chlorophyll‐a and magnesium phthalocyanine by proton nuclear magnetic double resonance. In phthalocyanine, the observed resonances correspond to a quadrupole coupling constant of 3.79 MHz for 25Mg and 1.81 MHz for the 14N ligands. In chlorophyll, the 25Mg coupling constant is 3.73 MHz.
13 citations
TL;DR: The nuclear quadrupole resonance spectrum of hydrogen-bonded hexamethylenetetramine triphenol was observed at 77°K and at room temperature in this paper.
Abstract: The nuclear quadrupole resonance spectrum of hydrogen bonded hexamethylenetetramine triphenol was observed at 77°K and at room temperature. The absorption lines were assigned to two inequivalent nitrogen sites. N(1), which is not hydrogen bonded, gave e2qQ/h=4665.7 kHz and η=0 at 77°K. N(2), which takes part in an N···H–O hydrogen bond, has e2qQ/h=4208.1 kHz and η=0.05014 also at 77°K. By comparing these data with the spectrum of pure hexamethylenetetramine (HMT) the effects of the hydrogen bond on the HMT nitrogen sites could be obtained. It is concluded that the nitrogen site N(2) loses a few hundredths of an electron from its lone pair orbital as a result of the hydrogen bond interaction.
13 citations