Lanthanide complexes of related click tripodal 1,2,3-triazole-containing ligands on the Ph3P(O) platform. The N2 and N3 coordination of triazole fragments

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The coordination and extraction properties of two related tripodal ligands differed by types of addition of the triazole fragment and linker length in the {2-[(4-Ph-1,2,3-triazol-1-yl)CH2CH2O]C6H4}3P(O) (L1) and {2-[(1-Ph-1,2,3-triazol-4-yl)CH2O]C6H4}3P(O) (L2) are compared. The structures of the complexes [Lа(NO3)3L1] (I) and [Lu(NO3)3L1] (II) are studied in the solid phase (elemental analysis, IR and Raman spectroscopy) and in solutions (IR and multinuclear 1H, 13C, and 31P NMR spectroscopy). A normal coordinate analysis at the TPSS-D4/Def2-SVP level is performed for an isolated molecule of the model complex [La{P(O),N3,N2-L3}(O,O-NO3)3] (L3 = {2-[(4-Me-1,2,3-triazol-1-yl)CH2CH2O]C6H4}3-P(O)). According to the set of spectral and quantum chemical data, ligand L1 exhibits the tridentate P(O),N2,N2 coordination in lanthanide complexes I and II. These are neutral complexes in the solid state and in CD3CN solutions, and the dynamic equilibrium of the neutral and ionic complexes is observed in CDCl3. Unlike ligand L1, ligand L2 exhibits the tetradentate P(O),N3,N3,N3 coordination in the [Ln(NO3)3L2] complexes with the same metals (Ln = La3+, Lu3+) in solutions. The efficiency of extraction of microquantities of f elements from the aqueous phase to 1,2-dichloroethane by compounds L1 and L2 is discussed in comparison with the structures of the complexes of both ligands in solutions.

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Sobre autores

А. Matveeva

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Autor responsável pela correspondência
Email: matveeva@ineos.ac.ru
Rússia, Moscow

М. Pasechnik

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Moscow

R. Aysin

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Moscow

О. Bykhovskaya

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Moscow

S. Matveev

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Moscow

T. Baulina

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Moscow

I. Kudryavtsev

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Moscow

А. Turanov

Institute of Solid State Physics, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Chernogolovka

V. Karandashev

Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences; National University of Science and Technology (MISiS)

Email: matveeva@ineos.ac.ru
Rússia, Moscow oblast, Chernogolovka; Moscow

V. Brel

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: matveeva@ineos.ac.ru
Rússia, Moscow

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2. Fig. 1. Comparison of fragments of Raman spectra of solid compounds L1 (a), I (b), II (c), III (d).

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3. Scheme 1.

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4. Scheme 2. Visualization of the N2- and N3-coordination of the triazole fragment in model complex IV.

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5. Scheme 3. Structure of [Ln{P(O),N2,N2-L1}(O,O-NO3)3] (Ln = La, Lu) complexes in solid form and in solutions. The “*” sign denotes the “free” (non-coordinated) triazole ring, which participates in additional intra- and intermolecular contacts.

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