Tetraethylammonium tetrafluoroborate

Recrystallization from a 5 1 mixture of ethyl acetate/hexane, or from methanol/diethyl ether, followed by storage under vacuum at 95 °C for 48 h. 

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Figure 2.62 The l/t transient obtained during the growth of a poly thiophene film on a 6.30 cm2 Pt electrode at 1.80V vs. SCE in acetonitrile/0,1 M tetraethylammonium tetrafluoroborate electrolyte. At f = 7 s, the potential was switched to OV to terminate the growth process. After...

Figure 3.59 Cyclic voltammogram of a glassy carbon electrode immersed in N2-saturated aceto-nitrile/0.2M tetraethylammonium tetrafluoroborate containing 5 x 10 3 M Re(dmbpy)(CO)3Ci, The scan rate is 100mVs 1. From Christensen et at. (1992).

Figure 3.62 FTIR spectra collected from the glassy carbon electrode immersed in CO -saturated acetonitrile/0.2 M tetraethylammonium tetrafluoroborate containing 5xlO 3M Re(dmbpy)(CO).,Cl. The spectra were collected at —1.1V, —1.3 V, — 1,4 V - 1.7 V and — 2.0 V, and normalised to the spectrum taken at — 1.0 V. 1100cm -1750cm"1 region. From...

Figure 3.76 (a) Plot of the log of the polypyrrole film conductivity polymer potential, , fora 10mV potential difference applied across a 13.9pm-thick film in 0.1 M tetraethylammonium tetrafluoroborate/CH3CN. (b) Plot of polypyrrole conductivity vs. fractional charge per pyrrole monomer subunit (qimm) in 0.1 M tetraethylammonium tetrafluorobnrate/CH3CN From Feldman et at. (1985). Copyright 1985 American Chemical Society. 

Tetraethylammonium tetrafluoroborate [429-06-1] M 217.1. Recrystd three times from a mixture... 

Tetraethylammonium tetrafluoroborate [429-06-1] M 217.1. Recrystd three times from a mixturg of ethyl acetate/hexane (5 1) or MeOH/pet ether, then stored at 95° for 48h under vacuum [Henry and Faulkngf1 JACS 107 3436 1985 Huang et al. AC 58 2889 1986]. 

Tetraethylammonium tetrafluoroborate. A solution of 5.3 g (25 mmol) of EttNBr in about 8 mL of water is reacted with HBF4 and concentrated. Next, it is diluted with ethyl ether and filtered to yield 4.6 g (85%) of the crude salt MP 375-378°C with decomposition. Two recrystallizations from a methanol-petroleum ether (BP 30-60°C) mixture yields 3.7 g (69%) of pure Et4NBF4 as white needles MP (after drying) 377-378°C with decomposition. 

Fig. 5 Cyclic voltammogram of hexachlorobenzene at a glassy carbon electrode in acetonitrile containing 0.1 M tetraethylammonium tetrafluoroborate (TEABF4). Sweep rate is 50 mV s 1. The cathodic peaks represent the stepwise dechlorination process.

Thin films of the substituted polyphenylpyrrole were prepared on a platinum electrode by the electrooxidation of the corresponding monomer (3) in an acetonitrile solution containing 0.1M tetraethylammonium tetrafluoroborate using the procedure described for the N-phenyl analog (4). Good films were produced in every case except in the electrooxidation of... 

O. 1M tetraethylammonium tetrafluoroborate in acetonitrile and a sodium chloride calomel reference electrode as before (4). The anodic region of the voltammograms show that peaks appear in the range 600-900 mV due to the redox reaction of the pyrrole units in the polymer backbone of each derivatized film (Table I). The reactions are coulombically reversible and the... 

Electrochemical cathodic reductions of acetylcyclopropanes in ammonia solution, with butyl-trimethylammonium tetrafluoroborate as supporting electrolyte, gave the same products as in the lithium/ammonia reductions. However, when tetraethylammonium tetrafluoroborate was employed, tertiary alcohols, e.g. 33 were isolated. The ethyl groups were probably incorporated by anionic attack on the initially formed ketones. 

Tetraethylammonium tetrafluoroborate See tetraethylammonium tetrafluoroborate in Metal-organic Compounds , Chapter 5. 

Tetraethylammonium tetrafluoroborate [429-06-1] M 217.1, m 235°, 356-367°, 275-277°, 289-291°. pK -4.9 (for HBF4). Dissolve the salt in hot MeOH, filter and add Et20. It is soluble in ethylene chloride [Thompson Kraus J Am Chem Soc 69 1016 1947, Wheeler Sandstadt 77 2025 7955]. It has also been recrystallised three times from a mixture of ethyl acetate/hexane (5 1) or MeOH/pet ether, then stored at 95° for 48hours under vacuum [Henry Faulkner J Am Chem Soc 107 3436 1985, Huang et al. Anal Chem 58 2889 1986], It is used as a supporting electrolyte. [Beilstein 4 IV 333.]... 

Acetonitrile was also used as the solvent for the first successful synthesis of a PAn/PPy copolymer via galvanostatic (constant-current) electropolymerization of mixtures of aniline (0.5 M) and pyrrole (0.1-1.0 M) in acetonitrile solvent in the presence of CF3COOH as acid and tetraethylammonium tetrafluoroborate as supporting electrolyte. Differential scanning calorimetry and Fourier transform infrared (FTIR) measurements confirmed that the electrically conducting product was a mixture of PAn, PPy, and a random PAn/PPy copolymer.36... 

Typically, when a solution of pyrrole (0.06 M) and tetraethylammonium tetrafluoroborate Et N BFf (0.1 M) in acetonitrile containing 1% water is electrolyzed, an insoluble blue-black film of conducting polymer is produced at the anode. The film contains 6 4 , has a conductivity of about 100 (ohm-cm) , and the composition is ... 

FIGURE 11.8. Electrochemical immobilization of GOx in poly(phenol) films on a 3-mm diameter platinum electrode. Experimental conditions 0.1-M phosphate buffer, 7 mg/ml GOx added electrolyte 0.15-M tetraethylammonium tetrafluoroborate potential sweep rate 50 mV s . Polymerization solution also contains (a) 50-mM phenol (b) 50 n 1/ml 1% w/w in methanol of [Os(byp)2(PVP)ioCl]Cl and 50-mM phenol. 

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