Three-dimensional 3d-4f heterometallic coordination polymers: syntheses, structures and properties

Six new 3d-4f heterometallic coordination polymers, {[Ln4Cu2(INAIP)8(H2O)15]center dot 14H2O}n [Ln=La (1), Pr (2), Nd (3)] and {[LnCo0.5(INAIP)2(H2O)2]center dot 2H2O}n [Ln=Tb (4), Dy (5), Yb (6), H2INAIP=5-(isonicotinamido)isophthalic acid] have been synthesised and characterised by single crystal X-ray diffraction analysis. The results of structural analyses showed that 1-3 are isomorphous showing two-fold interpenetrated three-dimensional (3D) coordination framework, while 4-6 have the same non-interpenetrated 3D structure with 2D (4, 4) lanthanide-carboxylate layers. The results revealed that the different transition metal centres have great influence on the structures of the resulted complexes in this system. In addition, thermogravimetric and magnetic properties of 1-6, and photoluminescence of 4 were investigated.