Inorganic perchlorato complexes

Pascal, Jean‐Louis; Favier, Frèdéric

doi:10.1016/s0010-8545(98)00102-7

Cited by 32 publications

(41 citation statements)

References 86 publications

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“…[36,37]; for a review see refs. To our knowledge, the perchlorate anion does not form direct bonds to uranyl at all, neither in crystals [43] norÐas shown hereÐin solution. [29, 40±42] Our EXAFS results suggest that triflate does also form direct bonds to uranyl in solution, if its concentration is high.…”

Section: Uranyl Cation In Triflic Acid Solutionsmentioning

confidence: 66%

Do Perchlorate and Triflate Anions Bind to the Uranyl Cation in an Acidic Aqueous Medium? A Combined EXAFS and Quantum Mechanical Investigation

Sémon

Boehme²,

Billard

et al. 2001

ChemPhysChem

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Section: Uranyl Cation In Triflic Acid Solutionsmentioning

confidence: 66%

Do Perchlorate and Triflate Anions Bind to the Uranyl Cation in an Acidic Aqueous Medium? A Combined EXAFS and Quantum Mechanical Investigation

Sémon

Boehme²,

Billard

et al. 2001

ChemPhysChem

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“…Dry perchlorates may explode and should be handled in small quantities and with the necessary precautions. [20] Preparation of dinuclear Ln III Fe II and Ln III Zn II complexes with L5-L7:I natypical synthesis, 27.6 mmol of Ln(CF 3 SO 3 ) 3 (1.0 equiv;L n= La or Eu) and 27.6 mmol of M(CF 3 SO 3 ) 2 (1.0 equiv;M= Fe or Zn) in acetonitrile/water (99:1, 1.38 mL) were added to 82.8 mmol of ligand Lk (3 equiv) in dichloromethane (700 ml) and the resulting clear solution was stirred for 4h under an inert atmosphere. The solvents were removed and the solid residue was dissolved in ace-tonitrile (2 mL).…”

Section: Methodsmentioning

confidence: 99%

Deciphering the Influence of Meridional versus Facial Isomers in Spin Crossover Complexes

Lathion

Guénée

Besnard

et al. 2018

Chemistry A European J

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Chelate coordination of non-symmetrical didentate pyrazine-benzimidazole (L1) or pyridine-benzimidazole (L2) N-donor ligands around divalent iron in acetonitrile produces stable homoleptic triple-helical spin crossover [Fe(Lk) ] complexes existing as mixtures of meridional (C -symmetry) and facial (C -symmetry) isomers in slow exchange on the NMR timescale. The speciation deviates from the expected statistical ratio mer/fac=3:1, a trend assigned to the thermodynamic trans-influence, combined with solvation effects. Consequently, the observed spin state Fe ↔Fe equilibria occurring in [Fe(Lk) ] refer to mixtures of complexes in solution, an issue usually not considered in this field, but which limits rational structure-properties correlations. Taking advantage of the selective and quantitative formation of isostructural facial isomers in non-constrained related spin crossover d-f helicates (HHH)-[LnFe(Lk) ] (Ln is a trivalent lanthanide, Lk=L5, L6), we propose a novel strategy for assigning pertinent thermodynamic driving forces to each spin crossover triple-helical isomer. The different enthalpic contributions to the spin state equilibrium found in mer-[Fe(Lk) ] and fac-[Fe(Lk) ] reflect the Fe-N bond strengths dictated by the trans-influence, whereas a concomitant solvent-based entropic contribution reinforces the latter effect and results in systematic shifts of the spin crossover transitions toward higher temperature in the facial isomers.

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“…[29] In the FT-IR spectrum of the complex there are three strong bands at 1162, 1100, and 1069, which can be assigned to the asymmetric Cl-O stretching vibrations of perchlorate. [30] As can be seen, the complexation displaced the absorption bands (by 10-20 cm −1 ) appreciably relative to those of the free ligands. This displacement was accompanied by a considerable increase in absorption band.…”

Section: Ftir Spectramentioning

confidence: 83%

Structure, Spectroscopic, Magnetic, Fluorescence, and Thermal Studies of Bis(perchlorate)tetrakis(pyrazole)copper(II)

Βaran

Esener

Türkyılmaz

2011

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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The complex bis(perchlorate)tetrakis(pyrazole)copper(II) has been prepared and characterized by single crystal X-ray analysis, FT-IR, UV-VIS spectroscopy and thermal methods. [Cu(ClO 4 ) 2 (pyzl) 4 ] crystallizes in the monoclinic system, space group C2/c, with a = 14.5186(11), b = 9.9513(7), c = 15.8564(11) Å, β = 115.5290(10) • V = 2067.2(3) Å 3 and z = 4. The molecular and crystal structure are stabilized by inter and intra molecular hydrogen bonds. The complex formation kinetics was studied at 310 nm. The activation parameters of the complex formation kinetics were determined as, H # : 200 kJ/mol, S # : 268 J/K. mol. The FT-IR spectra has been measured and assigned in the range of 4000-400 cm −1 . The Cl-O and N-H stretching vibrations confirms the presence of intramolecular hydrogen bonds. The magnetic moment of the complex was found to be 1.73 BM. The fluorescence quenching of pyrazole by Copper(II) was also studied in methanol.

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Inorganic perchlorato complexes

Cited by 32 publications

References 86 publications

Do Perchlorate and Triflate Anions Bind to the Uranyl Cation in an Acidic Aqueous Medium? A Combined EXAFS and Quantum Mechanical Investigation

Do Perchlorate and Triflate Anions Bind to the Uranyl Cation in an Acidic Aqueous Medium? A Combined EXAFS and Quantum Mechanical Investigation

Deciphering the Influence of Meridional versus Facial Isomers in Spin Crossover Complexes

Structure, Spectroscopic, Magnetic, Fluorescence, and Thermal Studies of Bis(perchlorate)tetrakis(pyrazole)copper(II)

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