Structure of Lithium Hexamethyldisilazide (LiHMDS): Spectroscopic Study of Ethereal Solvation in the Slow-Exchange Limit

1994 ◽  
Vol 116 (13) ◽  
pp. 6009-6010 ◽  
Author(s):  
Brett L. Lucht ◽  
David B. Collum
Keyword(s):  
Spectroscopic Study ◽  
Slow Exchange ◽  
Lithium Hexamethyldisilazide

A phosphorus-31 nuclear magnetic resonance spectroscopic study of complexes of zinc with some phosphine oxides, sulfides, and selenides

1983 ◽  
Vol 61 (8) ◽  
pp. 1800-1805 ◽  
Author(s):  
Philip A. W. Dean ◽  
Geetha K. Carson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Spectroscopic Study ◽  
Mixed Oxide ◽  
Ligand Exchange ◽  
Nmr Spectra ◽  
Zinc Complexes ◽  
Phosphine Oxides ◽  
Cadmium Complexes ◽  
Slow Exchange

Zn(SbF6)2 in liquid SO2 has been shown to act as an acceptor towards a variety of phosphine oxides, sulfides, and selenides, forming complexes which have been characterized in solution using 31P nmr. Slow-exchange 31P nmr spectra are reported for the complexes ZnLn2+ (n = 6, L2 = Ph2P(O)CH2P(O)Ph2 or L3 = (Ph2P(O)(CH2)2)2P(O)Ph; n = 4, L2 = Ph2P(E)CH2P(E)Ph2 (E = O, S, or Se) or bidentate (Ph2P(E)CH2)3CMe (E = S or Se), or L = (C6H11)3PE (E = O, S, or Se) or R3PE (E = S or Se, R = Ph or o-C6H4Me); n = 3, L3 = (Ph2P(E)(CH2)2)2P(E)Ph (E = S or Se) or L = R3PE (E = S or Se, R = C6H11, Ph, or o-C6H4Me); n = 2, L = R3PE (E = S or Se, R = o-C6H4Me or, perhaps, C6H11); n = 1 (possibly), L = (o-C6H4Me)3PS), and partial spectra for [Zn(SeP(C6H11)3)x(SP(C6H11)3)n−x]2+ (n = 3 or 4). No evidence was found for the mixed oxide-chalcogenide species [Zn(EP(C6H11)3)x(OP(C6H11)3)4−x]2+. In most cases the 31P nmr spectra are very similar to those reported earlier for the corresponding cadmium complexes. However, in most instances where comparison could be made it was found that the rate of intermolecular ligand exchange was less for the zinc complexes than for their cadmium counterparts. (Complexes with (Ph2P(O)(CH2)2)2P(O)Ph and Ph2P(O)(CH2)2P(O)Ph2 arc exceptional in being more labile for zinc than cadmium.)

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

A spectroscopic study of soil fulvic acid composition after six-year applications of urban waste compost

Agronomie ◽  
2003 ◽  
Vol 23 (8) ◽  
pp. 719-724 ◽  
Author(s):  
Giovanni Gigliotti ◽  
Alceo Macchioni ◽  
Cristiano Zuccaccia ◽  
Pier Lodovico Giusquiani ◽  
Daniela Businelli
Keyword(s):  
Spectroscopic Study ◽  
Fulvic Acid ◽  
Acid Composition ◽  
Urban Waste

A Spectroscopic Study of the Environments of Gravitational Lens Galaxies

2006 ◽  
Vol 20 ◽  
pp. 289-290
Author(s):  
I. Momcheva ◽  
K. Williams ◽  
C. Keeton ◽  
A. Zabludoff
Keyword(s):  
Spectroscopic Study ◽  
Gravitational Lens ◽  
Lens Galaxies

Tourmaline with the Usambara Effect (Optical Spectroscopic Study)

2015 ◽  
Vol 37 (1) ◽  
pp. 12-21
Author(s):  
M. Taran ◽  
E. Naumenko ◽  
A. Andreev
Keyword(s):  
Spectroscopic Study
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