Selective Extraction and Transport of the [PtCl<sub>6</sub>]<sup>2−</sup>Anion through Outer‐Sphere Coordination Chemistry

Warr, Rebecca J.; Westra, Arjan N.; Bell, Katherine J.; Chartres, Jy D.; Ellis, Ross J.; Tong, Christine C.; Simmance, Timothy G.; Gadzhieva, Anastasia; Blake, Alexander J.; Tasker, Peter A.; Schröder, Martin

doi:10.1002/chem.200802377

Cited by 62 publications

(48 citation statements)

References 50 publications

(48 reference statements)

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“…2b) strongly suggested that adsorption occurred by an outer-sphere, electrostatic process similar to Eq. (2) [37]. This conclusion is supported by other observations that the hexachloro complex is fairly inert to chloride loss [38].…”

Section: Template Synthesis Of Silica Np-supported Nanocatalystssupporting

confidence: 76%

Silica nanoparticles for template synthesis of supported Pt and Pt–Ru electrocatalysts

Zhao

Pierce

2010

Journal of Colloid and Interface Science

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Section: Template Synthesis Of Silica Np-supported Nanocatalystssupporting

confidence: 76%

Silica nanoparticles for template synthesis of supported Pt and Pt–Ru electrocatalysts

Zhao

Pierce

2010

Journal of Colloid and Interface Science

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“…The tripodal ligands H 3 MOST, H 3 TST, and H 3 PST were synthesized following literature procedures with modifications–see supporting information for details. 26–28 …”

Section: Methodsmentioning

confidence: 99%

Sulfonamido tripods: Tuning redox potentials via ligand modifications

Lau

Borovik

2015

Polyhedron

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A series of FeII–OH2 complexes were synthesized with ligands based on the tetradentate sulfonamido tripod N,N',N"-[2,2',2"-nitrilotris(ethane-2,1-diyl)]-tris-({R-Ph}-sulfonamido). These complexes differ by the substituent on the aryl rings and were fully characterized, including their molecular structures via X-ray diffraction methods. All the complexes were five-coordinate with trigonal bipyramidal geometry. A linear correlation was observed between the electronic effects of each ligand, given by the Hammett constants of the para-substituents, and the potential of the FeII/FeIII redox couple, which were determined using cyclic voltammetry. It was found that the range of redox potentials for the complexes spanned approximately 160 mV.

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“…3 35 Compounds 1-4 were synthesised by modifications of literature procedures (see ESI). 9 Proton NMR titration techniques were used to assess the stability of the receptor:anion complexes. Stability constants for the ligand-anion complexes were determined using the 40 EQNMR computer programme.…”

mentioning

confidence: 99%

Tripodal transmembrane transporters for bicarbonate

et al. 2010

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Easy-to-make tripodal tris-thiourea receptors based upon tris(2-aminoethyl)amine are capable of chloride/bicarbonate transport and as such represent a new class of bicarbonate transport agent.The key roles that anions play in a whole range of biological 10 processes has lead to much recent interest in the design of transporters and channels capable of carrying guests 1 such as chloride 2 or bicarbonate 3 across lipid bilayer membranes. Compounds based on tris(2-aminoethyl)amine (tren) have proven to be effective receptors for a variety of anionic 15 species. 4 Recently tren-based tris-ureas have been employed by Custelcean as agents to selectively crystallise strongly solvated tetrahedral oxo-anions such as sulfate. 5 In the anion transport arena, D.K. Smith and co-workers have shown that tren-based tris amides are capable of HCl co-transport through The results show that the thiourea derivatives are capable of both chloride/nitrate and more significanly of transporting the more hydrophilic bicarbonate anion via a chloride/bicarbonate antiport mechanism. 3 35Compounds 1-4 were synthesised by modifications of literature procedures (see ESI). 9 Proton NMR titration techniques were used to assess the stability of the receptor:anion complexes. Stability constants for the ligand-anion complexes were determined using the 40 EQNMR computer programme. 10 NMR titrations were conducted in DMSO-d 6 /0.5% water solutions with tetrabutylammonium anion salts (except for bicarbonate which was added as the tetraethylammonium salt). The results show that in all cases the receptors bind sulfate strongly with K a > bicarbonate. ¶ The X-ray crystal structure revealed that two equivalents of receptor 4 bind to a single carbonate anion in the solid state via twelve hydrogen bonds in the range 2.824(6)-3.070(7)Å with several other longer range NH … O interactions ( Figure 1a). We have previously observed that 60 anion receptors that form multiple hydrogen bond to oxoanions can perturb the pKa of the guest to the extent that the guest anion is deprotonated by free anion in solution. 11 This process may also occur here and account for the difficulty in fitting the bicarbonate NMR titration results to a simple 65 binding model. The structure itself shows the carbonate anion encapsulated between two receptors effectively shielded from the environent external to the complex. The sulfur atoms of the thiourea groups decorate the surface of the capsule-like complex (Figure 1b). 70In order to study the chloride transport properties of compounds 1-4 we prepared a series of unilamellar 1-palmitoyl-2-oleoylphophatidylcholine (POPC) vesicles loaded with sodium chloride (489 mM) and suspended them in an external NaNO 3 (489 mM) solution. A sample of receptor 1-4 75 or control compound trihexylamine (2% molar carrier to lipid) was added as a DMSO solution and the resultant Cl -efflux monitored using a chloride selective electrode. 12 After 300 s, the vesicles were lysed by addition of detergent and the final reading of the electrode was used to cali...

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Selective Extraction and Transport of the [PtCl₆]²⁻Anion through Outer‐Sphere Coordination Chemistry

Cited by 62 publications

References 50 publications

Silica nanoparticles for template synthesis of supported Pt and Pt–Ru electrocatalysts

Silica nanoparticles for template synthesis of supported Pt and Pt–Ru electrocatalysts

Sulfonamido tripods: Tuning redox potentials via ligand modifications

Tripodal transmembrane transporters for bicarbonate

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Selective Extraction and Transport of the [PtCl6]2−Anion through Outer‐Sphere Coordination Chemistry

Cited by 62 publications

References 50 publications

Silica nanoparticles for template synthesis of supported Pt and Pt–Ru electrocatalysts

Silica nanoparticles for template synthesis of supported Pt and Pt–Ru electrocatalysts

Sulfonamido tripods: Tuning redox potentials via ligand modifications

Tripodal transmembrane transporters for bicarbonate

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Product

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Selective Extraction and Transport of the [PtCl₆]²⁻Anion through Outer‐Sphere Coordination Chemistry