Nuclear quadrupole resonance in inorganic chemistry

The structure and reactivity of arsenic compounds: Biological activity and drug design

“…Ar, EX 3. 2At (Menshutkin complexes, where E is As, Sb, Bi; X is C1, Br; Ar is an aromatic molecule) have been studied by NQR [153]. In several of the AsX3.Ar complexes, the VSAs NQR frequency decreases considerably with respect to pure AsX 3, the 75As frequency shifts showing a linear correlation with the ionization potential of the aromatic molecule.…”

“…The theory and applications of nuclear quadrupole resonance (NQR) have been reviewed by Buslaev et al [153]. The nature of the spectra obtained is related to the electron distribution around the nucleus in question and thus they give information on the structure and bonding in complexes.…”

“…The nature of the spectra obtained is related to the electron distribution around the nucleus in question and thus they give information on the structure and bonding in complexes. NQR studies have [153]. The 7gAs NQR frequency of the tetrahedral ion [AsO4] 2-is dependent on the degree of distortion, which in turn affects the potarisation of the crystals.…”

Solid-state NMR spectroscopy of the quadrupolar halogens: chlorine-35/37, bromine-79/81, and iodine-127

“…they have nuclear spin quantum numbers (I) greater than one-half. 2,3 Of the NMR-active halogen nuclei, 19 F, 35 Cl, 37 Cl, 79 Br, 81 Br, and 127 I, all are quadrupolar with the exception of 19 F I D 1/2 . SSNMR spectroscopy of quadrupolar nuclei may pose many challenges, 4,5 the most unique of which stem from the nonzero nuclear electric quadrupole moment, Q, which vanishes for spin-1/2 nuclei.…”

High-field solid-state 35Cl NMR in selenium(IV) and tellurium(IV) hexachlorides

“…In practice, with the exception of the rare high symmetry cases, this result in extremely broad solid-state 35 Cl NMR spectra dominated by strong quadrupolar coupling interactions and often spanning hundreds of 35 Cl resonance studies remained in the domain of pure nuclear quadrupole resonance (NQR), where the NQR-measured 35 Cl quadrupole coupling frequencies ν NQR ( 35 Cl) on the order of 20-40 MHz are typical [3]. Recent applications of 35 Cl NQR, and NQR in general, range from structural and coordination chemistry [4] to explosives detection [5]. Gabuda and coworkers applied 35 Cl NQR to study the channel inclusion compounds (clathrates) of thiourea with hexachloroethane [6].…”