Zinc-imidazole salts

Hardy, E., Pupo, E., Castellanos-Serra, L., Reyes, J., Fernandez-Patron, C. Sensitive reverse staining of bacterial lipopolysaccharides on polyacrylamide gels by using zinc and imidazole salts. Anal Biochem 244 (1997) 28-32. 

Similarly, pyrrole, indole, and tetrahydrocarbazole [285] as well as diarylamines give the corresponding N-vinyl compounds [286]. Several improvements of yields and reaction rates were observed by conducting the reactions in the presence of additives [287, 288]. The vinylation of imidazole and benzimidazole was reported to be catalyzed by KOH in the presence of zinc or cadmium salts [289]. The above reactions were reviewed in 1965 [290]. 

Cu = Insoluble copper salt of the imidazoles Zn = insoluble zinc salt of the imidazoles. Plus acetaldehyde. "As oxalate. 

Femandez-Patron, C., Castellanos-Serra, L., and Rodriguez, P. (1992) Reverse staining of sodium dodecyl sulfate polyacrylamide gels by imidazole-zinc salts sensitive detection of unmodified proteins. Biotechniques 12, 564-573. 

Comparison of these data (Table V) show, quite clearly, how much more reactive the phosphonium salts are in the resin system than compounds such as substituted imidazoles and organo-zinc salts (e.g., zinc stearate and octoate). The only accelerator that shows substantially more potency than the quaternary phosphonium salts is uranyl nitrate. However, this compound is not a latent accelerator in the sense that storage lifetimes are only of the order of a few days. 

Vinyl pyridine and vinyl imidazole also form complexes with zinc chloride. Here, conjugation with the metal salt results in a super delocahzability and leads to spontaneous thermal polymerization [203, 204]. 

Zinc is stable in dry air and becomes covered with a white coating of basic carbonate on exposure to moist air. In compounds zinc occurs only in the bivalent state. The normal potential of Zn in the lUPAC convention is-0.763 V. Zinc salts are stable and the ion easily forms complexes with cyanide, thiocyanate, amines, and thiol or imidazole groups of proteins [1,3]. These complexes are less stable than those of Cu, and often also than those of Co and... 

In 2008, Yaghi s group reported two novel zeolitic imidazolate frameworks (ZIFs), ZlF-95 and ZIF-100, synthesized from 5-chloro-benzimidazole and zinc salts. ZIFs can mimic the widely studied Si02 zeolites because transition metals (Zn and Co) can replace the tetrahedral Si nodes and imidazolate can replace the oxygen linkers. ZIF-95 possesses a poz topology with four kinds of cages... 

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