Syntheses, structure and properties of three-dimensional pillared-layer Ag(I)-Ln(III) heterometallic coordination polymers based on mixed isonicotinate and hemimellitate ligands

► Three 3D pillared-layer 4d-4f HCPs were synthesized by hydrothermal reactions. ► The synergistic coordination strategy was employed. ► It opens new perspective for the construction of structurally diversified 4d-4f HCPs.