Complex sentence: There is no possible difference between the high and low-spin states in the d 8 octahedral complexes, however d 8 complexes are able to shift from paramagnetic tetrahedral geometry to a diamagnetic low-spin square planar geometry.
Split into simpler sentences: There is no possible difference between the high and low-spin states in the d 8 octahedral complexes. However, d 8 complexes are able to shift from paramagnetic tetrahedral geometry to a diamagnetic low-spin square planar geometry.