Crystalline samples of NaCuO2 have been synthesized and characterized
by magnetic susceptibility and Na-23-NMR investigations. Furthermore,
a Cu-63-NQR line at 37.48 MHz (4.2 K) could be detected. This frequenc
y is higher than all Cu-63-NQR frequencies found so far in high-T(c) s
uperconductors, which is in coincidence with the high formal valence o
f 3+ in NaCuO2.