Stereochemical structure of phosphorus-containing heterocycles. 41.Molecular structure of 2-diethylamino-4,5,7,8-dinaphtho-[1,2:1?,2?]-6H-1,3,2-dioxaphosphocin

1987 ◽  
Vol 36 (9) ◽  
pp. 1839-1842
Author(s):  
I. A. Litvinov ◽  
O. N. Kataeva ◽  
V. A. Naumov ◽  
R. P. Arshinova ◽  
B. A. Arbuzov
Keyword(s):  
Molecular Structure ◽  
Stereochemical Structure ◽  
Phosphorus Containing

SOME CORRELATIONS OF THE MOLECULAR STRUCTURE OF ORGANIC PHOSPHORUS COMPOUNDS WITH THEIR INFRARED SPECTRA

1955 ◽  
Vol 33 (10) ◽  
pp. 1552-1565 ◽  
Author(s):  
R. B. Harvey ◽  
J. E. Mayhood
Keyword(s):  
Molecular Structure ◽  
Absorption Band ◽  
Infrared Spectra ◽  
Organic Phosphorus ◽  
Phosphorus Compounds ◽  
Phosphorus Containing ◽  
Organic Esters

The infrared spectra of fourteen organic esters of phosphorus containing dimethylamino groups, and two esters containing diethylamino groups have been examined over the region 5000 to 670 cm.−1 (2 to 15 microns). Correlations have been obtained between absorption band frequencies and the presence of dialkylamino groups in the molecule as an aid to their identification in the spectra of phosphorus compounds. A number of compounds of the pyrophosphate type have been examined and absorption associated with the (P—O—P) linkage has been found in the 950 to 910 cm.−1 (10.5 to 11.0 micron) region. Some criteria are proposed to distinguish absorption by the (P—O—P) linkage in this region.

Molecular Structure of the Outermost Cell Wall Component of Spirillum Serpens

1977 ◽  
Vol 35 ◽  
pp. 342-343
Author(s):  
Wah Chiu ◽  
David Grano
Keyword(s):  
Molecular Structure ◽  
Cell Wall ◽  
Outer Membrane ◽  
Gel Electrophoresis ◽  
Electron Microscopic Examination ◽  
Electron Microscopic ◽  
Cell Wall Component ◽  
Protein Components ◽  
Exposure Technique ◽  
Structural Aspects

The periodic structure external to the outer membrane of Spirillum serpens VHA has been isolated by similar procedures to those used by Buckmire and Murray (1). From SDS gel electrophoresis, we have found that the isolated fragments contain several protein components, and that the crystalline structure is composed of a glycoprotein component with a molecular weight of ∽ 140,000 daltons (2). Under an electron microscopic examination, we have visualized the hexagonally-packed glycoprotein subunits, as well as the bilayer profile of the outer membrane. In this paper, we will discuss some structural aspects of the crystalline glycoproteins, based on computer-reconstructed images of the external cell wall fragments.The specimens were prepared for electron microscopy in two ways: negatively stained with 1% PTA, and maintained in a frozen-hydrated state (3). The micrographs were taken with a JEM-100B electron microscope with a field emission gun. The minimum exposure technique was essential for imaging the frozen- hydrated specimens.

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