Template-Reaktion von Bis(acetylacetonato)-dioxo-molybdän(VI) mit Benzoylhydrazin und Triphenylphosphan

Template Reactions of Bis(acetylacetonato)-dioxo-molybdenum(VI) with Benzoylhydrazine and Triphenylphosphane By reaction of MoO₂(acac)₂ with C₆H₅? CO? NH? NH₂ in the presence of P(C₆H₅)₃ Mo(NNCOC₆H₅)((CH₃)₂CNNCOC₆H₅)(P(C₆H₅)) was obtained besides MoO(acac-NNHCOC₆H₅)(NNHCOC₆H₅). The earlier compound was characterized by X-ray structural analysis. Crystallographic data see ?Inhaltsübersicht”?.     

Extraktionsverhalten methylsubstituierter chinolin-8-ole gegenüber kupfer

Extraction behavior of methyl-substituted 8-quinolinols towards copper). The distribution of 2-, 5-, and 7-methyl-8-quinolinols and the extraction of their copper chelates are reported for the chloroform/water system. The stability constants for the copper complexes were calculated. From the acidity and distribution constants of the isomeric 8-quinolinols and the stability and extraction constants of the copper chelates, 7-methyl-8-quinolinol provides the highest complex stability and is the best extractant of the series.     

Kristall- und Molekülstruktur von Bis(N,N-diethyl-2-benzoylthioacetamidato)kupfer(II)

Crystal and Molecular Structure of Bis(N, N-diethyl-2-benzoylthioacetamidato)copper(II) Bis(N, N-diethyl-2-benzoyl-thioacetamidato)copper(II) has been investigated by X-ray structure analysis. It crystallizes in the triclinic space group P1 with a = 10.709, b = 12.150, c = 15.651 Å, α = 90.13, β = 103.73, γ = 98.30° and with 3 formula units per unit cell. The structure was solved by heavy atom technique. The final R value was 0.04 for 4151 symmetry independent reflections. The crystal contains two symmetry independent molecules. One of them shows a nearly planar cis-arrangement of the ligator atoms but the other has an exactly planar trans-arrangement. The chelate rings show a distorted planarity in both molecules. The results of the structure determination confirm the conclusions from the EPR crystal spectrum.     

Spectral loudness summation for sequences of short noise bursts

Recent loudness data of single noise bursts indicate that spectral loudness summation depends on signal duration. To gain insight into the mechanisms underlying this duration effect, loudness was measured as a function of signal bandwidth centered around 2 kHz for sequences of 10-ms noise bursts at various repetition rates and, for comparison, for single noise bursts of either 10- or 1000-ms duration. The test-signal bandwidth was varied from 200 to 6400 Hz. For the repeated noise bursts, the reference signal had a bandwidth of 400 Hz. For the single noise bursts, data were obtained for two reference bandwidths: 400 and 3200 Hz. In agreement with previous results, the magnitude of spectral loudness summation was larger for the 10-ms than for the 1000-ms noise bursts. The reference bandwidth had no significant effect on the results for the single noise bursts. Up to repetition rates of 50 Hz, the magnitude of spectral loudness summation for the sequences of noise bursts was the same as for the single short noise burst. The data indicate that the mechanism underlying the duration effect in spectral loudness is considerably faster than the time constant of about 100 ms commonly associated with the temporal integration of loudness.