In this work we present a quantitative analysis of both quadrupolar splitti
ngs and deuterium Zeeman and quadrupolar spin-lattice relaxation times repo
rted in the literature for two isotopomers of Azpac, an acetylacetonate der
ivative of the cyclopalladated 4,4'-bis(hexyloxy) azoxybenzene. Azpac-d(4)
is deuterated at the aromatic rings and Azpac-d(26) is deuterated on the al
koxy chains. The additive potential method is used to model the splittings,
while the derived spectral densities are interpreted using the decoupled m
odel in conjunction with the Nordio model. The two side chains are assumed
to be noninteracting and identical in their conformations in order to limit
the size of the transition rate matric; needed to describe correlated inte
rnal bond rotations in the chains. Rotational diffusion constants and inter
nal jump rate constants are derived for this metallomesogen.