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Lanthanide complexes with a new luminescent iminophosphonamide ligand bearing phenylbenzothiazole substituents
Ist Teil von
Dalton transactions : an international journal of inorganic chemistry, 2024-01, Vol.53 (5), p.2181-2192
Ort / Verlag
England: Royal Society of Chemistry
Erscheinungsjahr
2024
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
A new iminophosphonamine Ph
2
P(HNPbt)(NPbt) (
1
, HL) bearing chromophore 2-(phen-2′-yl)-1,3-benzothiazole (Pbt) substituents was synthesized and introduced into lanthanide complexes. It was found that salt metathesis reactions between KL (
2
) generated
in situ
and LnCl
3
lead to the formation of tris-iminophosphonamide complexes [LnL
2
]L (Ln = Y (
3
), Sm (
4
), Gd (
5
), Dy (
6
)), regardless of the
2
/LnCl
3
ratio. Compounds
3-6
consist of a cationic fragment [LnL
2
]
+
, where the lanthanide atom is surrounded by two rigidly κ
4
-coordinated ligands, and an L
−
anion residing in the outer coordination sphere. Iminophosphonamine
1
shows a rare excitation wavelength-dependent two-band luminescence in the solid state. For compounds containing the deprotonated form, namely potassium salt KL and complexes of Gd and Dy, a single-band luminescence with the color changing from turquoise to orange was observed. The Sm complex reveals a set of a few narrow well-resolved bands corresponding to the f-f transitions against the background of the outer-sphere ligand's emission.
A new iminophosphonamine bearing chromophore 2-(phen-2′-yl)-1,3-benzothiazole substituents was synthesized and introduced into lanthanide complexes. The photophysical properties of the obtained compounds were studied.