Abstract
In order to obtain information about the motion of Mo(CO) 6 physisorbed on high surface area alumina, the temperature dependences of 13C NMR relaxation times, T 1 and T 2, have been measured at 7.05 T. Eight samples prepared under various conditions were studied. Two types of alumina (γ and η) were used and the alumina in two samples was pretreated with iron nitrate. A T 1 minimum of 0.4 s at 220 K observed for most samples corresponds to a correlation time of 2 × 10 −9 s. The dominant relaxation mechanism is not chemical shift anisotropy since T 1 measurements at 3.5 T indicated no field dependence. An increase in the iron content of the alumina decreased T 1 above 273 K but caused only minor changes in T 1 and T 2 at lower temperatures. T 1 was 0.73 s and T 2 was 11 ms for Mo(CO) 6 on the η-alumina sample at 300 K.
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