Studies in the tetraarylborates

Synthesis, Characterization, and Complexation of Tetraarylborates with Aromatic Cations and Their Use in Chemical Sensors

“…The stability constants of the complexes of N-methylpyridinium (6) and 1-ethyl-4-(methoxycarbonyl)pyridinium (7) with borate 1 were measured by 1 (Table 3). This mixture of solvents was chosen because methanol increases the solubility of the tetrakis(4-phenoxyphenyl)borate (1), thereby allowing comparison with the previously studied tetraphenylborate systems.…”

“…[11] Weak, noncovalent interactions such as C À H···p and N À H···p hydrogen bonds or p-stacking were identified as the principal intermolecular forces between the aromatic p-systems of tetraphenylborate and the organic cations in the crystalline state. Stability constants measured by 1 H NMR titrations of the tetraphenylborate complexes were relatively low.…”

“…The yellow solid complex formed immediately upon mixing of the solutions. 1 Ion-selective electrodes: Plasticized polymer membrane-based ion-selective electrodes (ISEs) were prepared by using poly(3,4-ethylenedioxythiophene) (PEDOT) as a solid contact material. [12] PEDOT was deposited on a glassy carbon (GC) disk electrode (area = 0.07 cm 2 ) by galvanostatic electrochemical polymerization (current = 0.014 mA, time = 714 s) from a deaerated aqueous solution containing 0.01 m 3,4-ethylenedioxythiophene and 0.1 m sodium poly(sodium 4-styrenesulfonate).…”

“…Tetraphenylborate was introduced in analytical chemistry in the 1940s, when it was used for the precipitation of monocations such as those of potassium, rubidium, cesium, and quaternary ammonium compounds. [1] Tetraphenylborate is an example of a simple organic precipitating reagent, but there have also been numerous studies of other substituted borates that form saltlike precipitates. [2] The investigation of borate complexes containing organic cations as guest mole-cules has not attracted a great deal of interest, although a variety of substituted borates bearing aryl groups have been synthesized.…”

Stromloser Ionentransport und Potentiometrie an Membranen mit Chromoionophoren für Li+und UO

“…[20]) und 32-34 Gew.-% PVC. Die erfolgreich eingesetzten Membranen enthielten Kalium-tetra@-chlorpheny1)borat (hergestellt nach [21]) als Additiv und TEHP als Weichmacher.…”