Instability of Diethyldithiocarbamic Acid at Low pH

Use of Sodium Diethyldithiocarbamate to Enhance the Open‐Circuit Voltage of CH3NH3PbI3 Perovskite Solar Cells

“…This fact supports our hypothesis that the DEDTC decomposes under the conditions of film formation via the mechanism in Scheme 2, and involves the cleavage of a carbon disulfide molecule, which due to its low boiling point (b.p. = 46 ºC), will evaporate [36b,41] . In a scenario where the DEDTC persists in the perovskite films, the S atomic concentration would double that of Na.…”

“…The thermal transformation of the DEDTC ligand can be related to the known decomposition of dithiocarbamates under acidic conditions, through a dithiodecarboxylation mechanism producing diethylamine and CS 2 . [ 36 ] The much higher p K a of CH 3 NH 3 + compared with HDEDTC indicates that the acid‐base equilibrium depicted in Scheme is shifted toward the side of DEDTC − and CH 3 NH 3 + . [ 37 ] We hypothesize that the loss of CS 2 and other volatile products at the increased temperatures used in the fabrication method provide the driving force for the decomposition of DEDTC.…”

“…In addition, the diethylamine formed can protonate because the p K a of its associated acid is similar to that of CH 3 NH 3 + . [ 36 ] The methylamine (boiling point [b.p.] = −6.3 ºC) formed in this reaction evaporates more readily than diethylamine (b.p.…”

An Acid Method for the Volumetric Estimation of Water-Soluble Dithiocarbamates

“…Recently, Martin (6) reported that the mechanism of decomposition of dithiocarbamate is not clear in the presence of an acid. The quantitative results obtained by the present method explain the validity of the proposed simple mechanism for the decomposition of the dithiocarbamate and the corresponding acid • as given by the Equations 1 and 2.…”

O,O'-Dialkyl Phosphorodithioic Acids as Extractants for Metals.

“…The ammonium salt of the diethyl ester was obtained from the Monsanto Chemical Co., St. Louis, Mo. If necessary, the acids can be synthesized readily by the straightforward reaction of alcohols with phosphorus pentasulfide (16,17,19). Short-chain (through butyl) phosphorodithioic acids can be purified by vacuum distillation.…”