Complex Formation with High Molecular Weight Amines. II.¹ A Spectrophotometric Study of the Dodecylamine—Cupric Acetate System

Abstract

In the first paper,3 it was mentioned that no complex compounds of high molecular weight amines and metal salts containing a ratio of amine to metal greater than 2:1 could be obtained. However, it has been noted that a solution of a 2:1 complex containing copper becomes a deeper blue upon the addition of an excess of the corresponding amine. With the thought that compounds other than the 2:1 complex might exist in solution, we have here attempted to apply the Method of Continuous Variations as expanded by Vosburgh and Cooper4 to the dodecylaminecupric acetate system. ExperimentalStarting Materials.-Dodecylamine and cupric acetate were prepared as described earlier.3 Reagent-grade trichloromethane and absolute ethanol were used throughout.Instrument.-The optical density measurements were performed in a Beckman Photoelectric Spectrophotometer, Model DU, with a cell length of one centimeter.Data.-Seven solutions, all 0.001 M with respect to cupric acetate and ranging from zero to 0,006 M with respect to dodecylamine, were made up in a solvent comprising 90% of trichloromethane and 10% of ethanol by volume. The absorption spectra of these solutions were

Tin Ion Directed Morphology Evolution of Copper Sulfide Nanoparticles and Tuning of Their Plasmonic Properties via Phase Conversion

“…From the experimental result that the crystal phase did not change in the absence of OAm, we propose that the distributions of cation and anion were slightly rearranged after the removal of copper atoms/ions by OAm at high temperature (140 ° C) (Figure d). Copper ions/atoms are easily removed from the Cu 2 S lattice by amine molecules through the formation of copper–amine complexes. , Indeed, we observed the absorption peak assigned to the copper–amine complexes after the treatment of Cu 31 S 16 NPs with excess OAm (Figure e). The phase conversion is accompanied by a drastical change of LSPR peak (Figure f).…”

“…Copper ions/atoms are easily removed from the Cu 2 S lattice by amine molecules through the formation of copper−amine complexes. 20,28 Indeed, we observed the absorption peak assigned to the copper−amine complexes after the treatment of Cu 31 S 16 NPs with excess OAm (Figure 4e). The phase conversion is accompanied by a drastical change of LSPR peak (Figure 4f).…”

Copper nanoparticles synthesized by hydroxyl ion assisted alcohol reduction for conducting ink

“…This is believed to be due to the formation of a copper-oleylamine complex. 33,34 Likewise, these absorbance peaks were unaltered even when the solution was heated at 140 C (curve a). However, when hydroxyl ions are introduced, the peak around 630 nm subsided, whereas the peak at 350 nm, which is ascribed to CuO, remained 24 (curve b).…”

Purification of Gold Organosol by Solid Reagent

“…All these support the proposed formula with two stearate and two amine ligands within the coordination sphere. Broome et al reported bisdodecylamino–cupric acetate as an adduct of copper acetate and DDA. We have used [Cu­(St) 2 ], and the formation of bisdodecylamino–cupric stearate is responsible for selective removal process.…”

“…Here, the extraction capability of straight chain thiols and amines of variable chain length has also been demonstrated. Broome et al reported the binding of high molecular weight amine with metal complex in 2:1 fashion and again they studied dodecylamine–cupric acetate binding spectrophotometrically . We have introduced an interesting solid reagent greenish blue copper stearate (stearate is the higher homologue of acetate) to trap unbound straight chain amines leaving behind pure amine bound organosol intact.…”