Synthesis and reactions of cationic palladium and platinum cyclopentadienyl complexes. Molecular structure of (.eta.5-cyclopentadienyl)[1,2-bis(diphenylphosphino)ethane]platinum(II) triflate

1993 ◽  
Vol 12 (10) ◽  
pp. 3851-3855 ◽  
Author(s):  
Stephen Fallis ◽  
Lori Rodriguez ◽  
Gordon K. Anderson ◽  
Nigam P. Rath
Keyword(s):  
Molecular Structure ◽  
Cyclopentadienyl Complexes ◽  
Cationic Palladium

Koordinationschemie perhalogenierter Cyclopentadiene und Alkine, XI [1].Darstellung einiger Cymantrenyl-mono- und bis-thioether mit einer weiteren funktionellen Gruppe am Cyclopentadienylring. Molekülstruktur von [C5Cl2(SMe)2(PPh2)]Mn(CO)3 / Coordination Chemistry of Perhalogenated Cyclopentadienes and Alkynes, XI [1]Synthesis of Some Cymantrene Mono- and Bis-Thioethers with One Additional Functional Group on the Cyclopentadienyl Ring. Molecular Structure of [C5Cl2(SMe)2(PPh2)]Mn(CO)3

1993 ◽  
Vol 48 (5) ◽  
pp. 583-590 ◽  
Author(s):  
Karlheinz Sünkel ◽  
Adrian Blum ◽  
Barbara Wagner
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Coordination Chemistry ◽  
Carboxylic Acid ◽  
Acid Chloride ◽  
Functional Group ◽  
Urea Derivative ◽  
Cyclopentadienyl Complexes ◽  
Work Up

Chiral Cyclopentadienyl Complexes, Crystal StructureThe reaction of [C5Cl4(SMe)]Mn(CO)3 (la) with n-butyllithium and the electrophiles SiMe3Cl, CO2, or PPh2Cl regiospecifically yields the chiral 1,3-disubstituted functional cymantrene thioethers [C5Cl3(SMe)R]Mn(CO)3 (R = SiMe3 (2), COOLi (3a), PPh2 (4)). 3 a can be protonated to give the corresponding carboxylic acid (3b), which in turn can be transformed to the acid chloride [C5Cl3(SMe)(COCl)]Mn(CO)3 (3c). 3c reacts with NaN3 to yield after work-up the urea derivative OC[[NH—C5Cl3(SMe)]Mn(CO)3]2 (3d). Using the cymantrene bisthioethers [C5Cl3(SR)2]Mn(CO)3 (R = Me, 5a, Ph, 5b) as starting materials, the carboxyl derivatives [C5Cl2(SMe)2(COR)]Mn(CO)3 (R = OLi, 6a, OH, 6b, Cl, 6c) and the potential organometallic S,P-chelate ligands [C5Cl2(SR)2(PPh2)]Mn(CO)3 (R = Me, 7a, Ph, 7b) can be obtained. The crystal structure determination of 7a (C22H16O3PS2Cl2Mn, monoclinic, P 21/c, a = 18.714(6) A, b = 9.506(3) A, c = 14.475(3) Α, β = 109.18(2)°, V = 2432.1(12) Α3, Z = 4) shows an orientation of the neighbouring PPh2- and SMe groups, that allows chelation of an additional metal fragment.

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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