Structure of oxonium hexafluoroniobate and hexafluorotantalate complexes with crown ethers of different dimensionality

Fonarı, Marina S.; Simonov, Yurii A.; Wang, Wen-Jwu; Tang, Shang-Wei; Ganin, E. V.; Gelmboldt, V. O.; Chernaya, T. S.; Алексеева, О. А.; Furmanova, N. G.

doi:10.1016/j.poly.2007.07.037

Cited by 17 publications

(12 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…63 In [(benzo-12C4) 2 ÁH 3 O + ][TaF 6 ], the oxonium ion is sandwiched between two 12C4 molecules rather than being involved in an extensive hydrogen bonding array with the anions. 49 The oxonium ions appear to be more strongly hydrogen bonded to the crown in [H 3 O + Á12C4] complexes with O-HÁ Á ÁO distances ranging from 2.488(5) to 2.531(5) A ˚which is much shorter than the related distances found in the 18C6 complexes above, where the typical values are 2.7-2. + and H 7 O 3 + in the same species (Fig.…”

Section: Crown Ethers As Binding Agents For Oxonium Ionsmentioning

confidence: 88%

“…In many of the complexes discussed above, oxonium ions have been found to crystallise from toluene, in which the liquid clathrate effect [51][52][53] as been observed. Also involved in a number of these species, 31,34,35,39,40,[43][44][45][46][47][48][49] are transition metals which have potentially catalytic properties, so the possibility of studying catalysis in liquid clathrate media is an exciting prospect. The highly ionic medium and the potential for a simple separation mechanism 52,53 could have great merit.…”

Section: Crown Ethers As Binding Agents For Oxonium Ionsmentioning

confidence: 99%

“…The with a pyramidal H 3 O + ion in the lattice. 49 conformation with an H 3 O + oxonium ion bound toward either end of the cavity of the crown ether (Fig. 13).…”

Section: Crown Ethers As Binding Agents For Oxonium Ionsmentioning

confidence: 99%

See 2 more Smart Citations

Crown ethers as stabilising ligands for oxonium ions

Junk

2008

New J. Chem.

View full text Add to dashboard Cite

Oxonium ions (H + Á(H 2 O) n ) can be stabilised and isolated in the solid state by using crown ethers of differing sizes. Crown ethers can act as very good hydrogen bond acceptors for the binding of oxonium ions. It has been reasonably well established that 18C6 binds the H 3 O + oxonium ion almost selectively in the cavity of the crown, while for the smaller crown ethers 12C4 and 15C5 the macrocycles generally span successive oxonium ions of varying nuclearity (H 3 O + , H 5 O 2 + , H 7 O 3 + and H 9 O 4 + ) to form hydrogen bonded polymers. Crown ethers larger than 18C6, e.g. 21C7 and 24C8 can bind H 5 O 2 + ions on the face of the crowns, while 30C10 appears to prefer two molecules of H 3 O + in the cavity. It is the intention of this perspective to review the literature involving the solid state interactions of crown ether complexes involving oxonium ions.

show abstract

Section: Crown Ethers As Binding Agents For Oxonium Ionsmentioning

confidence: 88%

Section: Crown Ethers As Binding Agents For Oxonium Ionsmentioning

confidence: 99%

See 1 more Smart Citation

Crown ethers as stabilising ligands for oxonium ions

Junk

2008

New J. Chem.

View full text Add to dashboard Cite

show abstract

“…131 There appear to be no reports of crown ethers complexed to the MF 5 , but a range of [oxonium-crown ether][MF 6 ] salts have been crystallised from aqueous HF-MeOH solutions of MF 5 and the crown ether. 136,137 The reaction of MF 5 with excess SR 2 (R = Me or Et) in the absence of a solvent gave colourless 1 : 1 adducts, which low temperature 19 F NMR spectroscopy identified as [MF 5 L] compounds. 110,138,139 In contrast, refrigeration of solutions of MF 5 and excess SMe 2 in CH 2 Cl 2 gave exceedingly moisture sensitive crystals, [MF 4 (SMe 2 ) 4 ][MF 6 ] which contain distorted dodecahedral cations (Fig.…”

Section: Niobium and Tantalummentioning

confidence: 99%

Medium and high oxidation state metal/non-metal fluoride and oxide–fluoride complexes with neutral donor ligands

2013

View full text Add to dashboard Cite

While most high and medium oxidation state (O.S. ≥ 3) metal and non-metal fluorides and oxide fluorides are strong Lewis acids, exploration of their coordination chemistry with neutral ligands has been limited and mostly non-systematic. This is despite the very different properties conferred on the acceptor centre by the small electronegative fluoride ligands compared to the heavier halides. This article sets out these key differences, discusses possible synthetic routes, the key characterisation techniques, and appropriate bonding models. Current knowledge of the coordination chemistry of d, f and p-block fluorides and oxide fluorides with neutral ligands (with donor atoms drawn from Groups 15 and 16 and including N-heterocyclic carbenes) is then presented and discussed, and the differences in properties compared to complexes containing the heavier halides are illustrated. The emphasis is on work published post 1990, but earlier work is also included as essential background and where no more recent information exists. Attention is drawn to unexplored areas meriting investigation and to possible applications of these complexes.

show abstract

“…The reaction between M 2 O 5 (M = Nb, Ta) with aqueous HF in the presence of 18crown-6 or 15-crown-5 afforded oxonium cations [(18-c-6)H 3 O] + or [(15-c-5)-H 5 O 2 ] + with hexafluoro-niobate and -tantalate anions. 40 In each case, X-ray crystallography indicates that the oxonium ion interacts with the oxygen atoms of the crown, with no hydrogen bonding to the [MX 6 ] À anion.…”

Section: Niobium and Tantalummentioning

confidence: 99%

Vanadium, niobium and tantalum

Coles

2008

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

View full text Add to dashboard Cite

This report summarizes the literature from 2007 pertaining to the chemistry of the group 5 elements. Novel coordination and organometallic compounds are included, along with selected applications in the areas of catalysis and bioinorganic/medicinal chemistry. HighlightsHighlights from 2007 include the ingenious use of the vanadium(IV/V) redox couple to sufficiently stabilize a monomeric phosphorus radical to allow its isolation and characterization, 4 the first example of a tantalum complex incorporating both alkyl and aquo ligands at the metal centre, 55 and a new family of Nb-and Ta-based olefin polymerization catalysts supported by bridged calixarene ligands. 79 2 Coordination chemistry Vanadium One of the attractive features of the chemistry of vanadium is the accessibility of the metal in several oxidation states, and whilst this may present a challenge to the synthetic chemist, the variety of ligands available for use in a supporting role ensures that most of the desired complexes can be isolated. Once tamed, the metal can be put to work in number of different roles and clever use of the resonance stabilization of the vanadium(IV/V) redox couple has enabled isolation of a monomeric phosphorus radical for the first time by Cummins and co-workers (1). 4 The redox chemistry of vanadium supported by a s,p,s-tripyrrole ligand set has been exploited in the cleavage of a coordinated dinitrogen molecule, in this case to afford a mixed-valent nitride-bridged complex (2).

show abstract

Structure of oxonium hexafluoroniobate and hexafluorotantalate complexes with crown ethers of different dimensionality

Cited by 17 publications

References 36 publications

Crown ethers as stabilising ligands for oxonium ions

Crown ethers as stabilising ligands for oxonium ions

Medium and high oxidation state metal/non-metal fluoride and oxide–fluoride complexes with neutral donor ligands

Vanadium, niobium and tantalum

Contact Info

Product

Resources

About