Abstract
AbstractDianthracene ligands obtained through photocycloaddition reaction can undergo de‐dimerization upon heating. Here we report the first examples of lanthanide‐dianthracene coordination polymers with chain structures, namely, [LnL(depma2)]Br ⋅ xH2O [1‐Ln, Ln=Dy (x=5), Gd (x=4); H2L=N1,N3‐bis(salicylideneimino)diethylenetriamine, depma2=photodimerized 9‐diethylphosphonomethylanthracene]. The lanthanide ions possess pseudo‐D5h geometries with five equatorial positions occupied by three N and two O atoms from L2− and two axial positions by the phosphonate oxygen atoms from bridging depma2 ligands. Thermo‐induced structural transformation is observed for both compounds between 120 and 140 °C, which involves de‐dimerization of depma2 and elimination of bromoethane. The structural transformation is accompanied with the switch‐on of photoluminescence and, in the case of 1‐Dy, also changes of magnetic dynamics.
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