Vibrational spectra of copper and silver organoacetylides

Structure Determination of Homoleptic AuI, AgI, and CuI Aryl/Alkylethynyl Coordination Polymers by X‐ray Powder Diffraction

“…For the two isostructural chains in 3 and 4 , the bands at 1928 and 1875 cm −1 in 3 and 1948 and 1890 cm −1 in 4 are attributed to the μ,η 1,2 ‐CC bridging modes. Previous infrared and Raman spectroscopic studies also did not support the presence of two chemically different types of CC bonds in the solid‐state structure of [{PhCCCu} ∞ ] and [{PhCCAg} ∞ ] 31a,b. The higher energy band at 2052 cm −1 in 4 is ascribed to asymmetric CC stretching due to weak silver–acetylide interactions 31c.…”

Walter Reppe Revival – Identification and Genesis of Copper Acetylides Cu2C2 as Active Species in Ethynylation Reactions

“…Aleksanyan et al. found C≡C bond wavenumbers being lower on average by 180–200 cm −1 compared to the corresponding alkyne precursor molecules in other copper(I) acetylide compounds [3b] . Sladkov et al.…”

“…indicate the same wavenumber for Cu−C σ‐bonds in other copper(I) acetylide compounds as for example (phenylethynyl)copper(I) (PEC, (CuC≡CPh) x ). [ 3a , 3b ] The signal at 1710 cm −1 corresponds to the C≡C bond and is surprisingly shifted; C≡C‐bonds are rather expected at 2100 cm −1 . Aleksanyan et al.…”

“…found C≡C bond wavenumbers being lower on average by 180–200 cm −1 compared to the corresponding alkyne precursor molecules in other copper(I) acetylide compounds. [3b] Sladkov et al. propose that the C≡C bond in copper(I) acetylide compounds can be shifted towards lower frequencies by up to 300 cm −1 because of the decreasing order of the C≡C bond.…”

Bronze Age of Direct Mechanocatalysis: How Alloyed Milling Materials Advance Coupling in Ball Mills

“…On several occasions, we could observe a shifted acetylene signal at 1930 cm À1 , which is in line with the literature reference of copper phenylacetylide (1a-Cu). [37] We can thus About 0.28 mmol of 1a were milled together with 1.68 g K 2 CO 3 and one milling ball in a 14 mL milling vessel for 90 min at 30 Hz in the MM. Vickers Hardness for milling materials: ZrO 2 : %1200 HV; bronze: 120-175 HV; Al-bronze milling vessels: 170-220 HV; [44] b) Because of the smaller volume, the amounts of 1a and base were reduced proportional and only one milling ball instead of two could be used; c) Base recycled from standard approach, Table 1, Entry 3, with incorporated abrasion of the bronze milling balls; d) Milled for 60 min for Raman measurement; e) 1a-Cu was used instead of 1a.…”