Cyanide Self-Addition, Controlled Adsorption, and Other Processes at Layered Double Hydroxides

Details Cyanide Self-Addition, Controlled Adsorption, and Other Processes at Layered Double Hydroxides Cyanide Self-Addition, Controlled Adsorption, and Other Processes at Layered Double Hydroxides

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001oleb...31...53b&link_type=abstract

Origins of Life and Evolution of the Biosphere, v. 31, Issue 1/2, p. 53-69 (2001).

Other

1

Cyanide, Damn, Hcn Polymer, Hplc, Layered Doublehydroxide, Ldh, Mineral Catalysis, Prebiotic Synthesis, Self-Addition

Scientific paper

Layered double hydroxides (LDH) are anion-exchanging materials of the type M(III)-M(II)_x(OH)_(2x+2)Y that occur abundantly in nature, and can concentrate, protect, and activate simple organic anionic species of possible relevance to the earliest organisms. We now wish to report progress in the following areas: 1) Internal vs. external uptake of anions. Ferrocyanide does not displace carbonate from synthetic hydrotalcite (Mg:Al LDH carbonate) but is nevertheless taken up on the outside of the particles. In other cases, anion uptake is controlled by specific hydrogen bonding requirements rather than by charge density alone, a feature that can be used to control whether uptake will be both internal and external, or external only. These two findings taken together have important implications for specific catalysis by LDH, since specific hydrogen bonding will affect the individual and relative conformations of substrate anions, and anions occupying space in the interlayer will be under tighter constraints than those adsorbed externally. 2) Specific reactions catalyzed by LDH. We have found that the LDH Mg_2Al(OH)_6Cl catalyzes the self-addition of cyanide, to give in a one-pot reaction at low concentrations an increased yield of diaminomaleonitrile and in addition, at higher (>= 0.05M) concentrations, a purple-pink material that adheres to the LDH. We are investigating whether this reaction also occurs with hydrotalcite itself, what is the minimum effective concentration of cyanide, and what can be learned about the products and how they compare with those reported at high HCN concentrations in the absence of catalyst.

Affiliated with

Also associated with

No associations

Rating

Cyanide Self-Addition, Controlled Adsorption, and Other Processes at Layered Double Hydroxides does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cyanide Self-Addition, Controlled Adsorption, and Other Processes at Layered Double Hydroxides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cyanide Self-Addition, Controlled Adsorption, and Other Processes at Layered Double Hydroxides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1216466