Bismut(III)‐formiate

Abstract

Die Bismut(III)‐formiate Bi[O2CH]3 und BiO[O2CH] wurden mit thermischen und massenspektroskopischen Methoden sowie mit IR‐Spektren charakterisiert.

Interaction of bismuth(III) oxide with formic acid solutions

“…The fundamen tal vibration frequencies in the spectrum of our pre pared bismuth(III) oxoformate (table) correspond to reported data [9]. A characteristic feature of the spec trum is a relatively broad, medium intensity band with a peak at 550 cm -1 , which belongs to Bi-O stretching vibrations [9]. The appearance in the spectra of bis muth formates of the strongest bands of antisymmetric ν аs (СОО -) and symmetric ν s (СОО -) stretching modes of the carboxylate ion and the disappearance of the ν(ОН) = 3400-3500 cm -1 stretching modes, which appear in the initial formic acid and belong to the carboxyl group, indicate the substitution of a bis muth containing cation for the carboxyl proton.…”

“…They are hardly noticeable in the spectrum of the salt. The fundamen tal vibration frequencies in the spectrum of our pre pared bismuth(III) oxoformate (table) correspond to reported data [9]. A characteristic feature of the spec trum is a relatively broad, medium intensity band with a peak at 550 cm -1 , which belongs to Bi-O stretching vibrations [9].…”

“…The bismuth content (wt %) in the precipitate is 77. 15 [14,15], but instead there are bands with the frequen cies corresponding to the vibrations of the carboxylate ion of the normal salt (table) [9,14,15]. In the formic acid spectrum, very weak bands of the stretching vibra tions of CH groups are masked by the strong absorp tion of the carboxyl OH groups.…”

“…The synthe sis of precursor bismuth acetate uses acetic anhydride, which is hard to obtain. Usually, bismuth formate is prepared by crystallization from bismuth oxide solu tions in formic acid by boiling and cooling the initial solution [5,6,9]; the final bismuth product yield is not high because of the low solubility of the oxide in for mic acid. However, Anishchenko et al [10] showed the feasibility of preparing bismuth formate by a solid-solution reaction as a result of treating 2 g of bis 2 Bi O 2 2 + muth oxide with 30 mL of formic acid solution under boiling for 10 min.…”

Synthesis of nanoporous bismuth films by liquid-phase deposition

“…3(b) and especially the peak for n(BiO) around 550 cm 21 are consistent with that reported for another oxo±bismuth carboxylate, BiO(OOCH). 25 Interestingly, this compound was identi®ed as the intermediate in the thermal decomposition of still another bismuth carboxylate, Bi(OOCH) 3 .…”