The solid-state structures of 1-Ln, 2-Pr, 3 and 4•C7H8 were determined by single crystal XRD (1-Ln are depicted in Figure and selected metrical parameters are compiled in Table ; see Supporting Information Figures S12-S15 for an electron density map for 1-La and the structures of 2-4, and Tables S1-S2 for supplementary crystallographic data). The diffraction data for 1-Ln are generally low resolution, and in the case of 1-La and 1-Pr we do not comment on interatomic distances and angles, though the connectivity is clear-cut as part of a structurally analogous series. Displacement ellipsoids set at 30% probability level and hydrogen atoms are omitted for clarity.