Layered Ln(III) Complexes from a Sulfonate‐Based 1,8‐Naphthalimide: Structures, Magnetism and Photophysics

Abstract

Five lanthanide(III) complexes of N‐(4‐phenylsulfonate)‐1,8‐naphthalimide (L1) are described {[Ln(L1)(DMSO)5(H2O)2](L1)2 ⋅3H2O where Ln(III)=Eu(III) (1), Tb(III) (2), Dy(III) (3), Ho(III) (4) and Er(III) (5)} . A structural, magnetic and photophysical study is reported for these complexes. The complexes feature a 1,8‐naphthalimide based anionic ligand, which is known for extending structure directing properties through π‐based interactions. Within these complexes L1 acts as both a coordinating ligand as well as a non‐coordinating counter‐ion and overall the solid‐state structures adopt layered topologies that are achieved through π‐π interactions between L1 molecules. Complexes of 1 and 2 display the characteristic line‐like emission profiles expected for Eu(III) and Tb(III) whilst the magnetic properties of the Dy(III) containing complex 3 were investigated.

1O2 Generating Luminescent Lanthanide Complexes with 1,8-Naphthalimide-Based Sensitizers

“…Luminescent Ln III complexes with 1,8-naphthalimide-based ligands have been reported, but their 1 O 2 generating properties have not been explicitly explored. ,− Ward and co-workers studied a Eu III DOTA-based complex featuring a 1,8-naphthalimide pendant that in solution displays concurrent ligand- and Eu III -centered emission as a white light emitter, and they determined a Eu III emission efficiency (ϕ Eu ) of 12% . Pischel and co-workers discussed a polyamine-derivatized naphthalimide chromophore for Eu III luminescence with ϕ Eu = 11% .…”

White light and colour-tunable emission from a single component europium-1,8-naphthalimide thin film

“…1,8-Naphthalimides (Nap) are excellent candidates, 19 as they emit across a broad range of wavelengths, 20 their solubility is tunable, they are synthetically easy to include into ligands, and have proven layer forming abilities. [21][22][23] Naphthalimides have previously been used to generate Ln 3+ complexes [21][22][23][24][25][26][27][28][29][30] including in white emissive lanthanide systems. 8,10 Ward and co-workers showed that single component multi-emission was possible by combining Eu 3+ and Nap in a macrocyclic complex, achieving white emission in solution (CIE coordinates of x,y = 0.27, 0.25) and blue emission in thin films prepared by evaporation.…”