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PaCl4 crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Pa4+ is bonded in a 8-coordinate geometry to eight equivalent Cl1- atoms. There are four shorter (2.68 Å) and four longer (2.93 Å) Pa–Cl bond lengths. Cl1- is bonded in a distorted water-like geometry to two equivalent Pa4+ atoms.
PaCl5 crystallizes in the monoclinic C2/c space group. The structure is one-dimensional and consists of two PaCl5 ribbons oriented in the (0, 0, 1) direction. Pa5+ is bonded to seven Cl1- atoms to form edge-sharing PaCl7 pentagonal bipyramids. There are a spread of Pa–Cl bond distances ranging from 2.49–2.80 Å. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Pa5+ atom. In the second Cl1- site, Cl1- is bonded in a water-like geometry to two equivalent Pa5+ atoms. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Pa5+ atom.