Molecular microstructure in thermotropic liquid crystals studied by nuclear quadrupole resonance spectroscopy

Environmental NMR: Fast-field-cycling Relaxometry

“…As evidenced throughout the present article, FFC NMR relaxometry overcomes all the aforementioned problems, although it lacks in resolution and cannot provide structural information concerning the chemical nature of the investigated environmental system. 6 In addition, model theories for FFC NMR relaxometry have been developed mainly for polymer dynamics such as lipids, proteins, and carbohydrates, 5,6,44,59,60 material science, 53,61 -63 and contrast agents for magnetic resonance imaging applications. 64,65 For this reason, FFC NMR relaxometry should be supported by results from other analytical techniques when it is applied in environmental field.…”

“…In particular, 35 Cl quadrupoles are observed in NMRD profiles as quadrupolar dips in the proton Larmor frequency interval 0.3-4.5 MHz. 61 Shape and position of the quadrupolar dips depend on temperature of the system and nature of the interactions between organo-chlorine compounds and their chemical environment. 61 Quadrupolar effects on relaxometry behavior of hydrogen nuclei in environmental systems can be generated also by 14 N nuclei.…”

“…61 Shape and position of the quadrupolar dips depend on temperature of the system and nature of the interactions between organo-chlorine compounds and their chemical environment. 61 Quadrupolar effects on relaxometry behavior of hydrogen nuclei in environmental systems can be generated also by 14 N nuclei. 6,66 The possibility to monitor the environmental behavior of nitrogen-containing molecules through the influence of 14 N on the dynamics of 1 H overcomes the classical limit for the high-field NMR spectroscopy.…”