ChemInform Abstract Durch Ligandenaustausch bei erh öhter Temp. zwischen den Komplexen (I) und (I... more ChemInform Abstract Durch Ligandenaustausch bei erh öhter Temp. zwischen den Komplexen (I) und (II) werden in Ausb. von 10% die Gemischtligandkomplexe (IV) und (V) erhalten, die durch Elementaranalyse und PM R-Spektren identifiziert werden. Die neu synthetisierten omplexe und die bekannten Derivate (I)-(III) -werden "Co-NMR-spektroskopisch zur Diskussion des Einflusses des S-Donators untersucht.
Protein backbone H-bonds (>N-H•••O-C<) show relationships between NMR h3 J NC' couplings measured... more Protein backbone H-bonds (>N-H•••O-C<) show relationships between NMR h3 J NC' couplings measured in solution and H-bond geometry parameters seen in X-ray crystal structures. Assuming that the solution and crystal structure of protein backbone is the same, the h3 J NC' couplings can be calibrated to provide good estimates of both angular and radial H-bond parameters in a solution. The crucial premise of equality between the solution and the crystal structure of protein backbone we validated on the level of the NH-bonds orientation, by comparing the orientations inferred from X-ray crystal structures with the solution ones determined from NMR residual dipolar couplings.
Four flavones (1-4) and nine sesquiterpene lactones (5-13), one of them (5) a new compound, were ... more Four flavones (1-4) and nine sesquiterpene lactones (5-13), one of them (5) a new compound, were isolated from the aerial parts of Achillea atrata L. subsp. multifida. Although the crude extract demonstrated in vitro inhibitory activity against Candida albicans and Bacillus subtilis, all isolated flavones were active against B. subtilis. Flavones 1, 2, and 3 were also active against C. albicans, while 1 and 3 exhibited activity against E. coli, as well. None of the tested lactones (7, 9, 12, and 13) showed any antimicrobial activity.
Se -' /,R,N=NR, + Se,CI, mmol) were reacted under the same conditions given in method A for CF,N=... more Se -' /,R,N=NR, + Se,CI, mmol) were reacted under the same conditions given in method A for CF,N=SeC12. The product C2FSN=SeC12 (1.8i g, 6.8 mmol) was is* lated as a clear, pale yellow liquid in 76% yield. IR (gas) 1233 (vs), 1212 (vs), 1134 (s), 1097 (vs), 929 (m), 754 (w), 704 (m) cm-l; IR (liquid) 1203 (vs b), 11 16 (m), 1084 (s), 933 (m) ) cm-'; mass spectrum (70 eV) m / z (relative intensity) 248 [M -C1]+ (61), 229 [M -CI -F]+ (35), 214 [M -CF,]' (46), 213 C2FsNSe+ (23), 194 C2F4NSe+ (29), 179 [M -CF, -CI]+ (27), 150 SeC12+ (23), 115 SeCl+ (loo), 94 NSe+ (20), 80 Se+ (34), 69 CF,+ (71), 50 CF2+ (7); chemical ionization mass spectrum (methane) m / z (relative intensity) 284 [M + HI+ (loo), 264 [M -F]' CF,), -89.5 (s, CF,); "Se NMR 6 1088 (t, N=Se, )JeF = 36.7 Hz). Decomposition of C2FsNSeC12. The pentafluoroethyl derivative was found to decompose in a fashion similar to that of CF,N=SeCl,. Analysis by Raman spectroscopy revealed that the white solid formed in the decomposition was SeCI4." A sample of C2FSN=SeC12 (1.90 g, 7.0 mmol) left standing in an FEP tube reactor for 4 days gave C2FSN=N-C2Fsl2 (0.53 g, 2.0 mmol) as the principal, volatile, decomposition product. A small quantity of CF$N (C0.25 mmol) was also found in the product mixture.
ChemInform Abstract Durch Ligandenaustausch bei erh öhter Temp. zwischen den Komplexen (I) und (I... more ChemInform Abstract Durch Ligandenaustausch bei erh öhter Temp. zwischen den Komplexen (I) und (II) werden in Ausb. von 10% die Gemischtligandkomplexe (IV) und (V) erhalten, die durch Elementaranalyse und PM R-Spektren identifiziert werden. Die neu synthetisierten omplexe und die bekannten Derivate (I)-(III) -werden "Co-NMR-spektroskopisch zur Diskussion des Einflusses des S-Donators untersucht.
Protein backbone H-bonds (>N-H•••O-C<) show relationships between NMR h3 J NC' couplings measured... more Protein backbone H-bonds (>N-H•••O-C<) show relationships between NMR h3 J NC' couplings measured in solution and H-bond geometry parameters seen in X-ray crystal structures. Assuming that the solution and crystal structure of protein backbone is the same, the h3 J NC' couplings can be calibrated to provide good estimates of both angular and radial H-bond parameters in a solution. The crucial premise of equality between the solution and the crystal structure of protein backbone we validated on the level of the NH-bonds orientation, by comparing the orientations inferred from X-ray crystal structures with the solution ones determined from NMR residual dipolar couplings.
Four flavones (1-4) and nine sesquiterpene lactones (5-13), one of them (5) a new compound, were ... more Four flavones (1-4) and nine sesquiterpene lactones (5-13), one of them (5) a new compound, were isolated from the aerial parts of Achillea atrata L. subsp. multifida. Although the crude extract demonstrated in vitro inhibitory activity against Candida albicans and Bacillus subtilis, all isolated flavones were active against B. subtilis. Flavones 1, 2, and 3 were also active against C. albicans, while 1 and 3 exhibited activity against E. coli, as well. None of the tested lactones (7, 9, 12, and 13) showed any antimicrobial activity.
Se -' /,R,N=NR, + Se,CI, mmol) were reacted under the same conditions given in method A for CF,N=... more Se -' /,R,N=NR, + Se,CI, mmol) were reacted under the same conditions given in method A for CF,N=SeC12. The product C2FSN=SeC12 (1.8i g, 6.8 mmol) was is* lated as a clear, pale yellow liquid in 76% yield. IR (gas) 1233 (vs), 1212 (vs), 1134 (s), 1097 (vs), 929 (m), 754 (w), 704 (m) cm-l; IR (liquid) 1203 (vs b), 11 16 (m), 1084 (s), 933 (m) ) cm-'; mass spectrum (70 eV) m / z (relative intensity) 248 [M -C1]+ (61), 229 [M -CI -F]+ (35), 214 [M -CF,]' (46), 213 C2FsNSe+ (23), 194 C2F4NSe+ (29), 179 [M -CF, -CI]+ (27), 150 SeC12+ (23), 115 SeCl+ (loo), 94 NSe+ (20), 80 Se+ (34), 69 CF,+ (71), 50 CF2+ (7); chemical ionization mass spectrum (methane) m / z (relative intensity) 284 [M + HI+ (loo), 264 [M -F]' CF,), -89.5 (s, CF,); "Se NMR 6 1088 (t, N=Se, )JeF = 36.7 Hz). Decomposition of C2FsNSeC12. The pentafluoroethyl derivative was found to decompose in a fashion similar to that of CF,N=SeCl,. Analysis by Raman spectroscopy revealed that the white solid formed in the decomposition was SeCI4." A sample of C2FSN=SeC12 (1.90 g, 7.0 mmol) left standing in an FEP tube reactor for 4 days gave C2FSN=N-C2Fsl2 (0.53 g, 2.0 mmol) as the principal, volatile, decomposition product. A small quantity of CF$N (C0.25 mmol) was also found in the product mixture.
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