Abstract
35Cl NQR frequencies and spin-lattice relaxation times T1 were measured of some deuterated chlorobenzoic acid, 3,5-dichlorobenzoic acid-d1 (35ClBA-d1), 2,6-dichlorobenzoic acid-d1 (26ClBA-d1), and 4-amino-3,5- dichlorobenzoic acid-dn (4A35ClBA-dn). The slightly higher frequencies were observed for the deuterated analogues. The temperature dependence of the T1 showed a minimum which can be explained by the fluctuation of electric field gradient (EFG) due to the proton transfer motion in the dimeric chlorobenzoic acid molecules. By the deuteration, the 35Cl T1 minimum shifted to the high-temperature side and showed approximately one order of magnitude shorter value. From comparison with the T1 data of the normal compounds, the tunneling contribution to the proton transfer motion in the dimeric molecular unit of chlorobenzoic acid in the crystal is discussed.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
