| Abstract
| - Near-infrared emitting complexes of Nd(III), Er(III), and Yb(III) basedon hexacoordinate lanthanide ions with an aryl functionalizedimidodiphosphinate ligand, tpip, have been synthesized and fullycharacterized. Three tpip ligands form a shell around the lanthanidewith the ligand coordinating via the two oxygens leading to neutralcomplexes, Ln(tpip)3. In the X-ray crystal structures of Er(III) andNd(III) complexes there is evidence of CH−π interactions betweenthe phenyl groups. Photophysical investigations of solution samplesof the complexes demonstrate that all complexes exhibit relativelylong luminescence lifetimes in nondeuteurated solvents. Luminescence studies of powder samples have also been recorded forexamination of the properties of NIR complexes in the solid statefor potential material applications. The results underline the effectiveshielding of the lanthanide by the twelve phenyl groups of the tpipligands and the reduction of high-energy vibrations in closeproximity to the lanthanide, both features important in the designof NIR emitting lanthanide complexes.
- A tetraphenyl imidodiphosphinate ligand provides an ideal framework structure for minimization of radiationless decay pathways of NIR f−f luminescence, leading to long-lived NIR luminescent complexes, Ln (tpip)3 where Ln = Nd, Er, Yb.
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