The effect of coordinated solvent ligands on the solid-state structures of compounds involving uranyl nitrate and Schiff bases

Evans, David J.; Junk, Peter Courtney; Smith, Matthew K.

doi:10.1016/s0277-5387(02)01182-8

Cited by 52 publications

(35 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aromatic Schiff bases containing a hydroxyl group in the ortho position may have two tautomeric forms, namely phenol-imine (O-HÁÁÁN) and keto-amine (OÁÁÁH-N) structures [17]. Various studies were carried out with these systems in order to establish the existence of intramolecular hydrogen bonding, stabilizing one of the tautomeric forms [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure and Spectroscopic Studies of 2-{(E)-[2-Hydroxyphenyl)imino]methyl} Phenol Schiff Base Molecule

et al. 2009

View full text Add to dashboard Cite

A new Schiff-base complex 2-{(E)-[2-hydroxyphenyl)imino]methyl}phenol has been synthesized and characterized by elemental analyses, UV-VIS and IR spectroscopy and single crystal X-ray determination. The structure comprises two independent and similar molecules. The two independent molecules in the asymmetric unit are hydrogen bonded and have different conformations. In each molecule, C 13 H 11 NO 2 , adopt an E configuration about the azomethine C-N double bond. The complex crystallized in the triclinic space group P-1. Two benzene rings and azomethine group are practically coplanar, as a result of intramolecular hydrogen bonds involving the hydroxy O atom and azomethine N atom. Also hydroxy group of the molecule is the presence intermolecular O-HÁÁÁO hydrogen bonds with the hydroxy group of the other molecule.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure and Spectroscopic Studies of 2-{(E)-[2-Hydroxyphenyl)imino]methyl} Phenol Schiff Base Molecule

et al. 2009

View full text Add to dashboard Cite

show abstract

“…There has been great interest in the separation of actinides (Ac) and lanthanides (Ln) in solution to aid the safe management of nuclear waste [1][2][3]. Many Schiff-base ligands have been designed and prepared with the aim of discriminating between Ln and Ac [4][5][6][7]. Tetradentate Schiff-base ligands are suitable for coordination to d-block transition metals due to their cavity size and planarity, but very few ligands have been found that chelate to f-block metals.…”

mentioning

confidence: 99%

Separation of actinides and lanthanides: crystal and molecular structures of N,N′-bis(3,5-di-t-butylsalicylidene)-4,5-dimethyl-1,2-phenylenediamine and its uranium complex

et al. 2004

View full text Add to dashboard Cite

The preparation of the tetradentate dianionic ligand N,N 0 -bis(3,5-di-t-butylsalicylidene)-4,5-dimethyl-1,2-phenylenediamine [H 2 L] is described, together with the corresponding uranium complex [UO 2 (L)CH 3 OH]. H 2 L has been found to selectively bind to a representative actinide ðUO 2 2þ Þ rather than to lanthanum (La 3+ ) due to its cavity size. Both the free ligand and uranyl complex were characterized by elemental analysis, spectroscopic methods and single-crystal X-ray diffraction. The crystal structure of [UO 2 (L)CH 3 OH] complex show that uranyl cation adopts a distorted pentagonal bipyramidal conformation, with two imine nitrogen atoms, two phenolic oxygen atoms and a methanol oxygen in the coordination sphere, together with two trans oxo groups. The oxo groups have a (O-U-O, 176.85(15)°) angle consistent with linear coordination and U-O bond lengths of 1.786(4) and 1.805(4) Å . The difference in the bond distances can be ascribed to the existence of a hydrogen bond between one uranyl oxygen and the O-H of a methanol of neighboring molecule. This complex has one of the highest solubilities in organic solvents of all uranium compounds, making it a potential candidate for applications in solvent extraction.

show abstract

“…The bond lengths and angles associated with the central uranyl moiety and the N2O2-donor ligand in [UO2(salen-SO3)(OH2)] 2-are comparable to those previously reported for UO2(salen)(MeOH), UO2(salen)(EtOH), UO2(salen)(TPPO) and UO2(salen)(OH2) (see ESI). [16][17][18][19] The bond length of the coordinated water, U-O = 2.3957(18) Å, is only slightly shorter than the values reported for the coordinated water molecule in UO2(salen)(OH2), U-O = 2.430(5) Å. [19] There are numerous structural studies that show that N2O2-donor Schiff base ligands can bind to trivalent lanthanide cations.…”

Section: Crystalsmentioning

confidence: 99%

“…[16][17][18][19] The bond length of the coordinated water, U-O = 2.3957(18) Å, is only slightly shorter than the values reported for the coordinated water molecule in UO2(salen)(OH2), U-O = 2.430(5) Å. [19] There are numerous structural studies that show that N2O2-donor Schiff base ligands can bind to trivalent lanthanide cations. Multifarious structural motifs have been observed, including tetradentate coordination through all four donor atoms and coordination just through phenolic oxygens.…”

Section: Crystalsmentioning

confidence: 99%

Challenging conventional f-element separation chemistry – reversing uranyl(vi)/lanthanide(iii) solvent extraction selectivity

et al. 2014

View full text Add to dashboard Cite

show abstract

The effect of coordinated solvent ligands on the solid-state structures of compounds involving uranyl nitrate and Schiff bases

Cited by 52 publications

References 27 publications

Synthesis, Crystal Structure and Spectroscopic Studies of 2-{(E)-[2-Hydroxyphenyl)imino]methyl} Phenol Schiff Base Molecule

Synthesis, Crystal Structure and Spectroscopic Studies of 2-{(E)-[2-Hydroxyphenyl)imino]methyl} Phenol Schiff Base Molecule

Separation of actinides and lanthanides: crystal and molecular structures of N,N′-bis(3,5-di-t-butylsalicylidene)-4,5-dimethyl-1,2-phenylenediamine and its uranium complex

Challenging conventional f-element separation chemistry – reversing uranyl(vi)/lanthanide(iii) solvent extraction selectivity

Contact Info

Product

Resources

About