Synthesis and characterization structural of alkali cations (Li + , Na + , K + , Rb + , Cs + ) carboxylate-dithiocarbamate complexes of L-Proline

Alkali Metal Dithiocarbamato Carboxylates (DTCCs) – Synthesis, Properties, and Crystal Structures

“…On the other hand, a series of N-dithioato-l-prolinates (6) has been previously reported by Tlahuext et al and characterized as the anhydrous salts. [18] This report seems questionable in the light of our results, as we identified the respective compounds as the hydrates 6-Li ⋅ 4H 2 O, 6-Na ⋅ H 2 O, and 6-K ⋅ 3H 2 O. [17] The specific amounts of crystal water were determined unambiguously through elemental analyses.…”

“…The reaction of an amino acid with carbon disulfide and an alkali metal hydroxide to the corresponding DTCC according to Scheme 1 has been conducted previously in methanolic [4,18,19] or in aqueous solution. [16,17,20,21] Even though the reaction proceeds relatively slow in water due to the poor solubility of carbon disulfide, using this solvent led to ideal results in our hands.…”

“…Among alkali metal DTCCs, the vast majority of known compounds are sodium and potassium derivatives, which have been isolated and characterized by NMR spectroscopy in only few studies. [4,[16][17][18] Lithium DTCCs have been mentioned only very briefly in the previous literature. [7] With the exception of the sodium, potassium, rubidium, and cesium salts of N-dithioato-lprolinate, none of these compounds has been structurally characterized in the solid state to the best of our knowledge.…”

“…[7] With the exception of the sodium, potassium, rubidium, and cesium salts of N-dithioato-lprolinate, none of these compounds has been structurally characterized in the solid state to the best of our knowledge. [17,18] In order to obtain a detailed picture about alkali metal DTCCs, we report here the preparation and extensive characterization of Li, Na, and K salts of DTCC anions derived from selected amino acids. All compounds were characterized by IR and NMR spectroscopy as well as elemental analyses, and the solid-state structures of a series of compounds are reported.…”

Synthesis and Crystal Structures of Alkali and Alkaline Earth Metal Complexes of 3,5‐Dinitropyrazolyl‐4‐carboxylate

“…While the 1 H NMR spectrum of H 2 dnpzc displays only one signal at δ = 13.61 ppm, corresponding to the protons of COOH group, its 13 C NMR spectrum shows signals at 108.57, 150.93 ppm for the pyrazolyl C atoms and 162.52 ppm for the carboxy group (Figures S2 and S3, Supporting Information) …”