Abstract
The paramagnetic doping of Cu(2+) in both mesoporous silica materials and microporous silicate crystals (zeolites) can be used effectively to enhance the signal intensity of (29)Si solid state magic angle spinning NMR, as a result of shortening of the spin-lattice relaxation time, T1, by the paramagnetic effect, because of the Cu(2+) electronic relaxation time in the range of 10(-8) s. This leads to drastically reduced data-collection times, typically 80-fold shorter than that in mesoporous silica. We found that the estimated range of the paramagnetic effect of Cu(2+) doping in porous silicates was at least 1 nm.
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