Keywords
charge transfer state
crystal structure
cyclopentadienyl ligand
lanthanide ions
luminescence
Abstract
Lanthanide complexes
$\mathrm{[Cp^{X}LnCl_2(Me_3{tach})]_n}$ ($\mathrm{Ln}$ = $\mathrm{Tb}$, $\mathrm{Gd}$; $\mathrm{Cp^X}$ = $\mathrm{Cp}$, $\mathrm{Cp^{Ph_4}}$; $\mathrm{Me_3tach}$ = 1,3,5-trimethyl-1,3,5-triazacyclohexane; $n = 1, 2$),
containing cyclopentadienyl ($\mathrm{Cp}$), 1,3-diphenylcyclopentadienyl ($\mathrm{Cp^{Ph_2}}$) and tetraphenyl-cyclopentadienyl ($\mathrm{Cp^{Ph_4}}$) anions as $\pi$-bonded antenna ligands, have been synthesized. A combined analysis of quantum chemical, optical and X-ray diffraction data has shown that the introduction of phenyl groups into the Cp ring leads to the inevitable appearance of intraligand charge transfer states due to the nonequivalence of the phenyl rings.
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