Unusual (4,6)-connected lanthanide 1,3-phenylenediacetate coordination frameworks displaying lanthanide contraction effect and 1D and 2D mixed self-weaving architecture

A series of 2D Ln-organic coordination frameworks (Ln = Sm3+ for 1, Eu3+ for 2, Tb3+ for 3, and Ho3+ for 4) with (4,6)-connected (44.52)(44.5.6)(44.54.66.7) topology has been constructed, in which 1D zigzag chains and 2D (4,4) networks intertwine mutually into the unusual 1D and 2D mixed self-weaving patterns. Interestingly, due to the lanthanide contraction effect, the 9-coordinated geometries of the Ln(III) ions gradually transform from triangle tetrakaidecahedron (Sm3+ and Eu3+), to a three-capped triangle prism (Eu3+ and Tb3+), and then to a single-capped anti-square prism (Ho3+).