Red Emitting Cerium(III) and Versatile Luminescence Chromaticity of 1D‐Coordination Polymers and Heterobimetallic Ln/AE Pyridylpyrazolate Complexes

Ten homoleptic lanthanide containing 1D-coordination polymers, three heterobimetallic lanthanide/alkaline earth complexes as well two alkaline of the formula 1∞[Ln(2-PyPz)3], [Tb2AE(2-PyPz)8], and [AE(2-PyPz)2(2-PyPzH)2], Ln=La−Nd, Sm−Ho, AE=Ca, Sr, Ba were obtained by reactions (Ln) and/or metals (AE) with ligand 3-(2-pyridyl)pyrazole. Organic melt based solvothermal synthesis results in a redox reaction. The investigated compounds exhibit fair thermal stability up to 400 °C. Ce3+ compound exhibits bright red 5d-based broad band emission maximum at around 640 nm under UV excitation marking an example strong reduction exited 5d states Ce(III). co-doping Gd-containing coordination polymers Eu3+ Tb3+ allows for shift chromaticity from ion specific 4 f-based colors close white light thus versatile tuning chromaticity. vice versa shows metal-to-metal energy transfer (MMET) between f-levels Eu3+, which influences colour.