Search

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. [ABSTRACT FROM AUTHOR]

New tetraphosphoryl tripodal ligands on the triphenylphosphine oxide platform [2-Ph2P(O)(CH2)nOC6H4]3PO with different linker length (n = 3, 4) were synthesized. Their composition and structure were determined by elemental analysis, IR and multinuclear (1H, 13C, and 31P) NMR spectroscopy, and X-ray diffraction analysis. Extraction properties of the ligands were studied using the example of extraction of microamounts of f-elements from an aqueous phase into 1,2-dichloroethane. [ABSTRACT FROM AUTHOR]

Tris[2-(3′-cyanopropoxy)phenyl]phosphine oxide has been obtained via the alkylation of tris(2hydroxyphenyl)phosphine oxide with 4-bromobutyronitrile in the presence of K2CO3. The product structure has been elucidated by means of X-ray diffraction analysis. The terminal cyano groups in the obtained phosphine oxide have been converted into tetrazole rings via the click-reaction with NH4N3 to give a new hybrid tripodal propeller ligand, tris{2-[3′-(tetrazol-5′′-yl)propoxy]phenyl}phosphine oxide. Palladium(II) complexes of the prepared ligand and its short-linker analog, tris[2-(tetrazol-5′-ylmethoxy)phenyl]phosphine oxide, have been synthesized. Cytotoxicity of the ligands and their Pd(II) complexes has been studied. [ABSTRACT FROM AUTHOR]

New tripodal 1,2,3-triazole ligands based on triphenylphosphine oxide platform with different linker lengths have been synthesized, and their structure has been determined by elemental analysis, 1H, 13C, and 31P NMR spectroscopy, mass spectrometry, and vibrational (IR and Raman) spectroscopy. The coordination and extraction properties of the new ligands have been studied in the complexation with uranyl nitrate and extraction of micro amounts of uranium(VI) from aqueous phase to 1,2-dichloroethane. [ABSTRACT FROM AUTHOR]

New tripodal ligand, tris(2-carbamoylmethoxyphenyl)phosphine oxide, has been synthesized via the alkylation of tris(2-hydroxyphenyl)phosphine oxide with chloroacetamide. The ligand structure has been studied by means of IR and NMR (1H, 31P) spectroscopy as well as X-ray diffraction. [ABSTRACT FROM AUTHOR]

A series of precursors of novel tripodal ligands (2-XCH2CH2CH2OC6H4)3PO, where X = AcO, HO, MeSO2O, Br, N3, were synthesized by the alkylation of the starting tris(2-hydroxyphenyl)phosphine oxide with 3-bromopropyl acetate followed by hydrolysis of the resulting triacetate to triol and conversion of the latter to trimesylate. Treratment of the resulting trimesylate with LiBr or NaN3 was used to prepare the corresponding tribromo or triazido derivatives. [ABSTRACT FROM AUTHOR]

A number of precursors of new tripodal ligands was obtained by hydroxyethylation of the starting tris(2-hydroxyphenyl)phosphine oxide, followed by conversion of the resulting tris[2-(2-hydroxyethoxy) phenyl]phosphine oxide to trimesylate. The treatment of the latter with LiBr or NaN3 afforded the corresponding tribromo and triazido derivatives. [ABSTRACT FROM AUTHOR]