A study of optically active heteroligand chelate complexes

1978 ◽  
Vol 27 (5) ◽  
pp. 910-912
Author(s):  
V. A. Pavlov ◽  
E. I. Klabunovskii ◽  
S. R. Piloyan ◽  
Yu. S. Airapetov ◽  
E. G. Rukhadze
Keyword(s):  
Optically Active ◽  
Chelate Complexes

A study of optically active heteroligand chelate complexes

1978 ◽  
Vol 27 (5) ◽  
pp. 905-909
Author(s):  
E. I. Klabunovskii ◽  
V. A. Pavlov ◽  
Yu. S. Airapetov ◽  
Ya. D. Fridman ◽  
V. A. Petukhov ◽  
...  
Keyword(s):  
Optically Active ◽  
Chelate Complexes

Preparation of silicas combined with optically active organic compounds: optical resolution of metal chelate complexes on the silica composites

1995 ◽  
Vol 697 (1-2) ◽  
pp. 279-287 ◽  
Author(s):  
Fujio Mizukami ◽  
Hiroyuki Izutsu ◽  
Tetsuya Osaka ◽  
Yoshikatsu Akiyama ◽  
Naokazu Uiji ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Metal Chelate ◽  
Optical Resolution ◽  
Optically Active ◽  
Chelate Complexes

Reaktionen von Metallkomplexen mit kleinen Ringen, XI [1] Ringöffnung von Aziridinen mit Metallcarbonylhydriden; β-Aminoacylchelat-Komplexe von Mangan, Molybdän, Wolfram und Cobalt / Reactions of Metal Complexes with Small Rings, XI [1] Ring Opening of Aziridines by Metal Carbonyl Hydrides; β-Aminoacyl Chelate Complexes of Manganese, Molybdenum, Tungsten and Cobalt

1984 ◽  
Vol 39 (2) ◽  
pp. 167-179 ◽  
Author(s):  
Wolfgang Danzer ◽  
Roland Höfer ◽  
Hartmut Menzel ◽  
Bernhard Olgemöller ◽  
Wolfgang Beck
Keyword(s):  
Carbon Atom ◽  
Metal Complexes ◽  
Spectral Data ◽  
Ring Opening ◽  
Metal Carbonyl ◽  
Optically Active ◽  
Nucleophilic Attack ◽  
Chelate Complexes ◽  
H Nmr ◽  
Co Insertion

The metal carbonyl hydrides HM(CO)3(π-C5H5) (M = Mo, W), HMn(CO)4L, HCo(CO)3L (L - CO, PPh3) react with aziridines by protonation of aziridine, nucleophilic attack of the corresponding carbonyl metallate and CO insertion to give the β-aminoacyl complexes 2-7. The ring opening of C-substituted aziridines is regiospecific. With alkyl substituted aziridines the nucleophilic attack of the carbonyl metallate occurs at the sterically less hindered carbon atom, with phenyl substituted aziridines at the phenyl substituted carbon atoms. From the reactions of HM(CO)3(π-C5H5) with optically active aziridines, which afford complexes with an asymmetric metal atom, only one diastereomer could be observed. The mechanism of these reactions is discussed and the spectral data (IR, 1H NMR, MS) of the complexes are reported. β-Aminoacyl complexes have also been obtained by addition of amines to [(π-C5H5)(CO)3M(alkene)]+BF4- (M = Mo, W).The methyl complex H3CMn(CO)5 reacts with aziridine to give the acetyl complexes H3CC(O)Mn(CO)4(aziridine) and H3CC(O)Mn(CO)3(aziridine)2, respectively

Optical analysis of ink and other contaminants in process waters

TAPPI Journal ◽  
2012 ◽  
Vol 11 (8) ◽  
pp. 51-58
Author(s):  
ANTTI HAAPALA ◽  
MIKA KÖRKKÖ ◽  
ELISA KOIVURANTA ◽  
JOUKO NIINIMÄKI
Keyword(s):  
Optically Active ◽  
Process Water ◽  
Paper Machine ◽  
Optical Analysis ◽  
Direct Process ◽  
Active Components ◽  
Water Contaminants ◽  
Dependent Measurement ◽  
Measurement Methodology

Analysis methods developed specifically to determine the presence of ink and other optically active components in paper machine white waters or other process effluents are not available. It is generally more interest¬ing to quantify the effect of circulation water contaminants on end products. This study compares optical techniques to quantify the dirt in process water by two methods for test media preparation and measurement: direct process water filtration on a membrane foil and low-grammage sheet formation. The results show that ink content values obtained from various analyses cannot be directly compared because of fundamental issues involving test media preparation and the varied methodologies used to formulate the results, which may be based on different sets of assumptions. The use of brightness, luminosity, and reflectance and the role of scattering measurements as a part of ink content analysis are discussed, along with fine materials retention and measurement media selection. The study concludes with practical tips for case-dependent measurement methodology selection.

Microscopic Structure of Er-Related Optically Active Centers in Si

2003 ◽  
Vol 770 ◽  
Author(s):  
H. Przybylinska ◽  
N. Q. Vinh ◽  
B.A. Andreev ◽  
Z. F. Krasil'nik ◽  
T. Gregorkiewicz
Keyword(s):  
Ground State ◽  
Photoluminescence Spectrum ◽  
Zeeman Effect ◽  
Optically Active ◽  
Single Type ◽  
Active Centers ◽  
Mbe Growth ◽  
Spectral Components ◽  
Er Doped ◽  
Successful Observation

AbstractA successful observation and analysis of the Zeeman effect on the near 1.54 μm photoluminescence spectrum in Er-doped crystalline MBE-grown silicon are reported. A clearly resolved splitting of 5 major spectral components was observed in magnetic fields up to 5.5 T. Based on the analysis of the data the symmetry of the dominant optically active center was conclusively established as orthorhombic I (C2v), with g‼≈18.4 and g⊥≈0 in the ground state. The fact that g⊥≈0 explains why EPR detection of Er-related optically active centers in silicon may be difficult. Preferential generation of a single type of an optically active Er-related center in MBE growth confirmed in this study is essential for photonic applications of Si:Er.

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