Dithiocarboxylic acids metal complexes

Dithiobenzoic acid metal complexes, 2, 646 colours, 2, 646 Dithiobiuret metal complexes, 2, 640 Dithiocarbamates chelating resins mineral processing, 6,826 Dithiocarbamic acid metal complexes, 2,585 amine exchange, 1,428 photographic emulsions, 6,98 nickel poisoning, 6,768 tellurium(Il) complexes photothermography, 6,121 Dithiocarbazic acid metal complexes, 2,803 Dithiocarbimic acid metal complexes, 2,588 Dithiocarbimic acid, cyano-metal complexes, 2,808 Dithiocarboxylic acids metal complexes, 2,646 Dithiodiacetic acid metal complexes, 2, 806 Dithiodiketones... 

Cyclopentene-l-dithiocarboxylic acid, 2-amino-meta complexes, 2, 800 Cyclophane chlorophylls, 3, 58 Cyclophane hemes iron complexes, 4,1269 Cyclophosphazenes metal complexes, 2, 81 Cyclopropane carbonylation... 

The free dithiocarboxylic acids can be isolated, but their salts are preferred. In some cases their metal complexes can be prepared directly by insertion of carbon disulfide into metal-carbon bonds. Thus, the reaction of Grignard reagents, RMgX, with CS2, followed by acid treatment gives the dithiocarboxylic acids RCSSH and metal complexes in good yields.311... 

Goewie et al. (19) developed an organometallic-silica bonded phase for the selective retention of phenylurea herbicides and anilines from water. Seven-micrometer diameter silica was derivatized with 2-amino-1-cyclopentene-l-dithiocarboxylic acid (ACDA), resulting in Structure I. Capacity factors of phenylurea herbicides and corresponding anilines were measured on the ACDA-silica and ACDA-metal-loaded silica. The platinum-loaded material was found to selectively retain the anilines. Anilines could be eluted with acetonitrile, but not with methanol or tetrahydrofuran, because of the strength with which acetonitrile forms complexes with platinum and thus displaces the anilines. Application of the ACDA-Pt precolumn in series with an ODS-silica precolumn for... 

The preparation and properties of the dithiocarboxylic acids and their metal complexes have been reviewed several times.38"11 The formation of C—C bonds in the direct reaction of CS2 requires sufficiently nucleophilic carbon bases, directly or potentially accessible in the form of ambifunction-al phenoxides, organometalfic compounds, CH acidic compounds, enamines or ketimines. Carba-nions react with CS2 to give dithiocarboxylates. The preparation and purification of the adds is performed via their salts. Metal complexes are in general readily available. The bonding in these complexes is mostly of the type (27) but a bonding mode (28) is also found. Action of elemental sulfur upon heavy metal complexes of (29) aromatic dithiocarboxylic acids yields the perthio complexes (29) of these compounds. 

Cyclopentene-l-dithiocarboxylic acid, 2-amino-mctal complexes, 800 Cyclophosphazenes metal complexes, 81 Cyclotetraphosphazene, octamethyl-platinum complexes, 82 Cyclotetraphosphazenes metal complexes, 81 Cyclotriphosphorus complexes, 1058 Cysteine... 

Abstract In this chapter, we review dithiocarboxylic acid salts. Methods of synthesizing these salts are reviewed, such as insertion of carbon disulfide into the metal-carbon bond, reaction of a dithiocarboxylic acid with a transition metal salt in the presence or absence of a base, ligand exchange of dithiocarboxylato metal or ammonium salts with another metal complex bearing a leaving group, and so on. The dithiocarboxylic acid complexes exhibit a variety of coordination styles that have been characterized by X-ray crystallographic analysis. Spectroscopic (IR, C, and UV-Vis) properties of the salts are summarized. The reactivities, structures, properties, characteristics and applications of each salt are discussed in detail for the salts of most elements (except for carbon). 

Most of the work with calamitic dithiocarboxylates has centered on studies on metal complexes of 4-alkoxydithiobenzoic acids. Complexes of the empirical formula [M( -odtb)2] were synthesized for M = Ni, Pd, and Zn (196) and square-planar gold(III) complexes showing SmA phases ([AuX2( -otdb)] X = Cl, Br, Me) were also described. 

Most of the work on dithiocarboxylates have been centered on metal complexes of 4-alkoxydithiobenzoic acids (abbreviated to n-odtbH) 34. 

In compounds of main group elements, the band ranges from 870 to 1285 cm [6,102]. In transition metal compounds, it is observed from 810-1385 cm [50,53]. If the C=S double-bond character is low, as seen for a free dithiocarboxylate anion, the stretching shifts to lower wavenumbers [38,124]. This is also true for complexes where the dithiocarboxylate hgand is conjugated with an a,p-unsaturated double-bond, and/or complexes with a C=S - H hydrogen bond [50]. If the C=S double-bond character is high in the dithiocar-boxyUc acid salt, the vCS vibrations appear at 1100-1200 cm [82,95]. 

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