ChemInform Abstract: SURFACE COMPOUNDS OF TRANSITION METALS. XIV. COORDINATIVELY UNSATURATED SURFACE COMPOUNDS OF VANADIUM(III) ON SILICA GEL

1977 ◽  
Vol 8 (3) ◽  
pp. no-no
Author(s):  
B. HORVATH ◽  
J. GEYER ◽  
H. L. KRAUSS
Keyword(s):  
Transition Metals ◽  
Silica Gel ◽  
Surface Compounds

Synthesis of Silica Gel with Surface Layer of Transition Metals 8-Oxyquinolinates for Gas Chromatography

2014 ◽  
Vol 1040 ◽  
pp. 405-409 ◽  
Author(s):  
Aleksandra I. Makarycheva ◽  
Yury G. Slizhov
Keyword(s):  
Gas Chromatography ◽  
Surface Layer ◽  
Transition Metals ◽  
Silica Gel ◽  
Morphological Structure ◽  
Analytical Separation

The modification of Silochrome C80 with copper(II), cobalt(II) and nickel(II) 8-oxyquinolinates complexes was carry out. The range of working temperatures, morphological structure, polarity and chromatographic properties of the obtained sorbents were investigated. New sorbents were used for analytical separation of ketone mixtures of normal and isomeric chain by gas chromatography.

Oberflächenverbindungen von Übergangsmetallen, XX Komplexe von Oberflächen-Chrom(II) mit Olefinen /Surface Compounds of Transition Metals, XX Complexes of Surface Chromium(II) with Olefines

1978 ◽  
Vol 33 (11) ◽  
pp. 1278-1284 ◽  
Author(s):  
Hans-Ludwig Krauss ◽  
Ulrich Westphal
Keyword(s):  
Double Bond ◽  
Transition Metals ◽  
Oxidative Addition ◽  
Metal Bond ◽  
Surface Compounds ◽  
Secondary Reactions ◽  
Bond Rearrangement

Abstract Surface chromium(II) supported on silica forms 1:1 and 1:2 complexes with defines; polyenes prefer chelate structures. For the ligand-to-metal bond a “Zeise-Salt” type is postulated. Secondary reactions include cis-trans isomerisation, shift of double bond, rearrangement of C-framework and polymerization/oligomerization. Cyclopentadiene obviously gives a h5 -cyclopentadienyl/hydrogen complex by oxidative addition followed by H2 emission and formation of a h5 -cp-CrIII complex; in this case the metal can be split off from the support by H+ without cleavage of the cp-Cr-bond.

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