The solid state structures of 1-Ln, 2-Yb, 3-Ln and 4-Ln were determined by single crystal XRD (see Figure for depictions of 1-Eu, 2-Yb, 3-Eu and 4-Eu; as other congeners of 1-Ln, 3-Ln and 4-Ln are isostructural they are depicted in the SI Figures ). Selected bond distances and angles for all complexes are presented in Tables , and crystallographic parameters are compiled in the SI Tables .