G. Zheng et al., EXPERIMENTAL AND THEORETICAL-STUDIES OF THE C-13 CHEMICAL-SHIFT TENSORS OF SOLID-STATE L -TYROSINE, Huaxue xuebao, 55(8), 1997, pp. 729-733
The principal values of C-13 chemical shift tensors in powdered L - ty
rosine were measured by a newly developed triple - echo two - dimensio
nal magic angle turning (MAT) experiment. Theoretical results obtained
by using the gauge invariant atomic orbitals (GIAO) ab initio method
are basically in agreement with the observed values. It is shown that
in complex system like L - tyrosine, using a locally dense basis set w
ith a number of atomic basis functions for the carbon atom of interest
and smaller sets of atomic functions for the other atoms can not only
save the disk capacity and computing time but also produce satisfacto
ry results.