Tetra-n-butylammonium tetrafluoroborate

The preferred electrolytes if the solvent is water are KC1 and NaN03. If the solvent is a non-aqueous organic liquid, then we prefer salts of tetra-alkyl ammonium, such as tetra-n-butylammonium tetrafluoroborate, "BrnN+BF. ... 

Tetra-n -butylammonium tetrafluoroborate [429-42-5] M 329.3, m 160-162°. Recrystd from ethyl acetate, and dried at 80° under vacuum [Detty and Jones JACS 109 5666 1987]. 

For the electrochemical measurements reported herein, all cyclic voltammetry measurements are performed in CH2C12 with 0.1 M tetra-n-butylammonium tetrafluoroborate (Bu4NBF4) as supporting electrolyte, while measurements in CH3CN use 0.1 M tetra-ethylammonium perchlorate. Cyclic voltammetry measurements are performed in a three-electrode, one-compartment cell equipped with a Pt working electrode, a Pt auxiliary electrode, and a saturated sodium chloride calomel (SSCE) reference electrode. E1 2 = (Ep.a + Ep.c)/2 AEP = Ep,e - Ep,a-Ei/2 and AEP values are measured at 100 mV/sec. Ferrocene is used as a reference in the measurement of the electrochemical potentials. 

The phenomena enumerated in Section 2.4 do not, of course, fully describe all the differences between chemical and electrode processes of ion radical formation. From time to time, effects are found that cannot be clearly interpreted and categorized. For instance, one paper should be mentioned. It bears the symbolic title ir- and a-Diazo Radical Cations Electronic and Molecular Structure of a Chemical Chameleon (Bally et al. 1999). In this work, diphenyldiazomethane and its 15N2, 13C, and Di0 isotopomers, as well as the CH2-CH2 bridged derivative, 5-diazo-10,ll-dihydro-5H-dibenzo[a,d]cycloheptene, were ionized via one-electron electrolytic or chemical oxidation. Both reactions were performed in the same solvent (dichloromethane). Tetra-n-butylammonium tetrafluoroborate served as the supporting salt in the electrolysis. The chemical oxidation was carried out with tris(4-bromophenyl)-or tris(2,4-dibromophenyl)ammoniumyl hexachloroantimonates. Two distinct cation radicals that corresponded to it- and a-types were observed in both types of one-electron oxidation. These electromers are depicted in Scheme 2-28 for the case of diphenyldiazomethane. 

Tetra-n-butylammonium tetrafluoroborate. A solution of 8.4 g (25 mmol) of (n-Bu)4NBr in a minimum volume of water ( — 18 mL) is treated with 3.6 mL ( — 26 mmol) of aqueous 48-50% HBF4. The resulting mixture is stirred at 25 °C for 1 min and the crystalline salt is collected on a filter, washed with water until the washings are neutral, and dried. The crude salt (6.3 g or 79%, MP 155-175°C) is recrystallized three times from ethyl acetate-pentane mixtures to separate 6.0 g (75%) of (n-Bu)4NBF4 as white needles MP (after drying) 162-162.5°C. 

Bright blue electroluminescent devices have been fabricated using poly(9,9-dioctylfluorene) (POF) as an emissive layer, PPV as a hole-transporting layer, tetra-n-butylammonium tetrafluoroborate as a dopant, and a lithium-aluminum alloy as a cathode. ... 

Tetrabromocyclooctane, 155 Tetrabromovinylcyclohexene, 155 Tetrabutylammonium bromide, 98, 314 Tetrabutylammonium perchlorate, 17 Tetra-n-butylammonium tetrafluoroborate, 107, 110, 112 3,3, 5,5 -Tetra-tert-butyl biphenol, 240 Tetrabutylphosphonium bromide, 337 Tetrabutyl titanate, 435, 463... 

Redox potentials for each donor-acceptor molecule were determined in MTHF containing O.IM tetra-n-butylammonium tetrafluoroborate using a Pt disc electrode at 21 . These potentials were measured relative to a saturated calomel electrode using ac voltammetry. Both the one electron oxidations and reductions of these molecules exhibited good reversibility. 

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