Oxalate complexes with manganese

A PRP -1 (Hamilton Reno, NV) reversed phase column was coated with cetylpyridinium and eluted with tetramethylammonium salicylate acetoni-trile water.89 The separation was comparable to that observed on conventional ion exchange. Coated phases were also used to separate oxalate complexes of manganese, cobalt, copper, and zinc.90 Reversed phase silica supports were coated with poly(N-ethyl-4-vinylpyridinium bromide), poly(dimethydiallylammonium chloride), poly(hexamethyleneguanidinium... 

Method 13 describes the generation of amorphous manganese oxide (AMO) materials that are made by the complexation of oxalic acid with KMn04. This reaction is done at SO C and leads to an amorphous gray black powder. The chemical and physical properties of AMO are very different than all the other materials listed in Table IV. K+ ions are incorporated into AMO due to reduction of Mn + ions. Analytical data suggest that some unreacted oxalic acid is incorporated into the AMO powder. This suggests that some Mn4- ions are reduced to Mn3+ creating a mixed valent species, as is the case for OL-1,... 

Manganese ions interfere (oxidized to permanganate) as do also mercury(II) salts, molybdates, and vanadates, which give blue to violet compounds with the reagent in acid solution. The influence of molybdates can be eliminated by the addition of saturated oxalic acid solution thereby forming the complex H2[Mo03(C204)]. 

Koval chuk et al. have proposed another complex system for the polymerization of acrylonitrile45 In this case Mn++ ions are oxidized on Pt anodes in aqueous solution of oxalate ions, giving rise to a MnOa anodic deposit. Manganese dioxide reacts with the oxalate, originating free radicals which act as polymerization initiators. 

---