Table 1. Selected bond lengths (Å).

Pr1—O5i	2.4215 (15)
Pr1—O7	2.4320 (15)
Pr1—O8i	2.4657 (15)
Pr1—O2	2.5117 (17)
Pr1—O1	2.5324 (16)
Pr1—O4	2.5501 (15)
Pr1—N1	2.6199 (18)
Pr1—O5	2.6755 (15)
Pr1—N2	2.6782 (18)

Symmetry code: (i) .