Abstract
We report H1 and Na23 nuclear magnetic resonance (NMR) and relaxation measurements in two variants of the V6 cluster with formula [CH3H6]4Na2[H4{V3L}2P4O4]⋅14H2O and Na6[H4{V3L}2P4O4]⋅18H2O, respectively. Both the NMR linewidth and the spin-lattice relaxation (NSLR) data can be explained semiquantitatively by assuming a dipolar coupling between the proton (sodium) nuclei and the three V(IV) magnetic moments forming an almost equilateral triangle with nearest neighbor antiferromagnetic exchange interactions. From the temperature dependence of the Na23 NSLR we obtain the value of the two gaps separating the lower energy total spin states.
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