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Improved Copper(I)–NHC Catalytic Efficiency on Huisgen Reaction by Addition of Aromatic Nitrogen Donors

“…Surprisingly, 10 is a weak complex, based on a comparison (Figure 5 and Table 4) with literature values reported for [Cu(Phen)] + and [Cu(Phen) 2 ] + 14. Inspection of the distances deduced from single‐crystal X‐ray diffraction rules out the involvement of a steric effect to account for this low association.…”

“…[13] Evaluation of the complex stoichiometry by Jobs continuous variation method, in dichloromethane, revealed the Bond angles [8] N 3 -Cu-N 4 N 4 -Cu-Cl N 3 -Cu-Cl C 1 -Cu-Cl 10 77.4(2) 99.9(1) 102.0(2) 120.5(2) 1 ---178.5(1) www.chemeurj.org typical formation of a 1:1 (host:guest) complex in agreement with our X-ray data (Scheme 5, Figure 4, and Table 4). Surprisingly, 10 is a weak complex, based on a comparison ( Figure 5 and Table 4) [14] Inspection of the distances deduced from single-crystal X-ray diffraction rules out the involvement of a steric effect to account for this low association. The weakness of complex 10 could be attributed to different electronic effects from the two ligands.…”

Modern analytical thermooptical spectroscopy

“…The development of a methodological basis of measurements, a consideration of thermodynamic and kinetic factors, which affect the selectivity and sensitivity of the detection and minimisation of test experiments substantially improve the metrological characteristics of thermal lens procedures for the detection of various compounds. 228, 229, 232, 274, 276, 283, 382, 391 ± 406 These procedures were used for determining molybdenum 27 and copper 401 in sea water, cobalt, 90 nickel 91,93 and iron 92,93 in highly pure water, bismuth 28 and cobalt 90,93 in highly pure metals and nickel in nickel-containing heteropoly compounds, which are used as active compounds in chemical sensor elements for the detection of ammonia in the atmosphere. 407 The use of thermal lens spectrometry allows one to reduce the number of stages of analysis of heteropoly compounds and increase the accuracy of the determination of nickel.…”

Thermal lens spectrometry as a tool for determination of stability constants of complex compounds

“…Good solubility of the complex is provided by DMSO, whereas MeCN, being simultaneously the ligand and solvent, increases resistance of the [Cu(Phen) 2 ] + com plex to oxidation with atmospheric oxygen. 30 We used a 4 : 1 DMSO-MeCN mixture in the presence of an excess of ascorbic acid (6.3•10 -3 mol L -1 ) to prevent oxidation of copper(I). At higher concentrations of MeCN, the solu bility of the complex substantially decreases.…”