Funct. Mater. 2024; 31 (3): 413-418.

doi:https://doi.org/10.15407/fm31.03.413

Trinitrato-tris-N-(diphenylphosphoryl)-2-methoxybenzamido lanthanides (III); Synthesis and Spectral Studies

N. S. Kariaka1, V. O. Trush1, S. S. Smola2, N. V. Rusakova2, T. Yu. Sliva1, V. M. Amirkhanov1

1 Inorganic Chemistry Department, Taras Shevchenko National University of Kyiv, 12, Pavla Skoropadskogo str., Kyiv 01601, Ukraine
2 A.V. Bogatsky Physicochemical Institute, NAS of Ukraine, 86, Lustdorfska doroga str., Odessa 65080, Ukraine

Abstract: 

N-(diphenylphosphoryl)-2-methoxybenzamide (HL) was approbated as a ligand towards lanthanides and new complexes Ln(HL)3(NO3)3 (Ln= La, Nd, Eu, Gd, Tb, Lu) were obtained and characterized. It was shown that the intramolecular hydrogen bond N-H···O in the N-(diphenylphosphoryl)-2-methoxybenzamide molecule prevents its deprotonation and leads to monodentate coordination towards lanthanide via a phosphoryl group oxygen atom, while the nitrate anions are coordinated in a bidentate manner. The influence of the methoxy group of the aromatic substituent of the ligand on the spectral properties of the obtained compounds is discussed. The complexes Nd(HL)3(NO3)3, Eu(HL)3(NO3)3 and Tb(HL)3(NO3)3 exhibit intense f-f emission, sensitized by N-(diphenylphosphoryl)-2-methoxybenzamide with an emission lifetime for EuIII and TbIII of about 1.3 ms and an intrinsic quantum yield for EuIII of 62 %.

Keywords: 
lanthanide, luminescence, coordination compounds, carbacylamidophosphates

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