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Introduction of Molybdenum Disulphide

Solid-state nuclear magnetic resonance (NMR) has proven to be a powerful tool for the study of complex motions on a microscopic scale, since both conformational and dynamical properties may be obtained. As an element-selective method, sensitive to local interactions, as homo- and hetero- dipolar interactions and nuclear electric quadrupolar couplings, NMR line shapes and relaxation time studies can provide valuable information on the atomic and molecular motions that modulate these interactions.

Interpretation of NMR relaxation measurements is not always straightforward, however. One of the requisites to extract detailed dynamic information from the NMR studies is to determinate the interactions responsible for the relaxation process. The dominant nuclei interactions in ionic conductors and molecular solids are:  magnetic interactions which couple to the nuclear magnetic dipole moments, and quadrupolar interactions which accounts for the interaction between the non-cubic electric field gradient (EFG) at the nuclear site and the quadrupole moment of the
nucleus with spin I > 1.

In the present contribution we probe 7Li (I = 3/2) to illustrate the potential of the NMR techniques to study the molecular architecture and lithium dynamics in nanocomposite formed by the co-intercalation of lithium and dialkylamines in molybdenum disulphide. In the last decade, there has been growing the interest in intercalation compounds based on transition metal dichalcogenides because of their potential applications as electrodes in solid-state batteries . Additionally, the study of the dynamics of the species intercalated in layered materials constitutes one interesting problem in the field of solid-state physics. A number of recent studies have been addressed to the arrangements and the dynamics of species confined in low-dimensional spaces.

n a previous study we reported a carbon (13C), proton (1H) and lithium (7Li) NMR investigation of the nanocomposite formed by the intercalation of lithium and diethylamine into molybdenum disulphide, Li0.1MoS2[C4H10NH] [18]. Here, we extend this study to include the nanocomposites prepared with larger amines, such as C8H18NH (dibutylamine) and C10H22NH (dipentylamine). Our purpose is to provide a more extensive discussion showing how the NMR line shape and relaxation studies can be used to bring up information on both the molecular architecture and the lithium dynamics in these systems. 

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