I think the question is fitting on this sub. We know that N2 is one of the most thermodynamically stable chemicals out there.
Yet, nitrogen atoma seem have to it hard to get back to their element. Hydrazines, azo groups, azides, tetrazoles and even pentazoles(even an N5+ ion!) are all not only isolatable, but also need like 70C or so to decompose.
Is it just me or is Nitrogen kinetically hindered to get back to it's elemental form? Is there a reason for that?
Hello last day ng exam 2dei at empty pa rin ang utak q 😀, baka may solved exers/ probsets kayo, reference sites/books or notes??? Pls am desperate maraming salamat huhu
Hydrogen binding of molecules on specific solid surface is an attractive interaction that can be employed as driving force for chemical bond activation, material directed assembly, protein protection, etc. However, the lack of quantitative characterization method for hydrogen bonds (HBs) on surface seriously limits its application. Herein, we measured the standard Gibbs free energy change (ΔG 0 ) of surface HBs using NMR technique. HBs accepting ability of surface was investigated in term of comparing ΔG 0 values by employing model biomass platform 5-hydroxymethylfurfural on a series of Co-N-C-n catalysts with electron-rich doped-nitrogen contents adjusted. Reducing the ΔG 0 effectively improves HBs accepting ability of the nitrogen-doped surface, and promotes the O−H bonds selectively initiated activation in the oxidation of 5-hydroxymethylfurfural. As a result, the reaction kinetics is accelerated and the rate constant is significantly increased. In addition to excellent catalytic performance, the turnover frequency (TOF) value for this oxidation is extremely higher than the reported non-noble metal catalysts.
https://ift.tt/3iGx3cq
Hey guys,
I was just wondering why there are not as many possible chemicals for nitrogen as there are for carbon? In a world where there are so many carbon chains, rings, nanotubes, etc. why doesn't nitrogen form similar structures? For instance, I was thinking of an aromatic 6-membered ring in which all of the atoms were nitrogen, with alternating double bonds, somewhat analogous to benzene - but I couldn't find anything like it on the internet. Could you guys explain why we don't see compounds like this? Would nitrogen not be able to have its own "organic chemistry?"
Structural searches from first principles have led to the prediction of solid‐state carbodiimides, guanidinates, and ortho‐nitrido carbonates, the latter introducing the diamond motif into condensed‐matter nitrogen chemistry by high pressure. Some of these novel phases are expected to show potential in terms of photoelectrochemical water splitting and nonlinear optics.
Abstract
Due to its unsurpassed capability to engage in various sp hybridizations or orbital mixings, carbon may contribute in expanding solid‐state nitrogen chemistry by allowing for different complex anions, such as the known NCN2− carbodiimide unit, the so far unknown CN35− guanidinate anion, and the likewise unknown CN48− ortho‐nitrido carbonate (onc) entity. Because the latter two complex anions have never been observed before, we have chemically designed them using first‐principles structural searches, and we here predict the first hydrogen‐free guanidinates TCN3 (T=V, Nb, Ta) and ortho‐nitrido carbonates T′2CN4 (T′=Ti, Zr, Hf) being mechanically stable at normal pressure; the latter should coexist as solid solutions with the stoichiometrically identical nitride carbodiimides and nitride guanidinates. We also suggest favorable exothermic reactions as useful signposts for eventual synthesis, and we trust that the decay of the novel compounds is unlikely due to presumably large kinetic activation barriers (C−N bond breaking) and quite substantial Madelung energies stabilizing the highly charged complex anions. While chemical‐bonding analysis reveals the novel CN48− to be more covalent compared to NCN2− and CN35− within related compounds, further electronic‐structure data of onc phases hint at their physicochemical potential in terms of photoelectrochemical water splitting and nonlinear optics.
https://ift.tt/3cL2zRE
The title speaks for itself, I'm just curious if the only obvious thing that stands out in this compound ACTUALLY IS what makes it so safe to digest yet effective to produce hallucinogenic experience results in humans or if its something more subtle.
https://preview.redd.it/z5hoxu9yfw641.jpg?width=1497&format=pjpg&auto=webp&s=cd32a53d40c8a69daeea227d6f07e53bd108285c
Due to its unsurpassed capability to engage in various sp hybridizations or orbital mixings, carbon may contribute in expanding solid‐state nitrogen chemistry by allowing for different complex anions, such as the known NCN2‒ carbodiimide unit, the so far unknown CN35‒ guanidinate anion, and the likewise unknown CN48‒ ortho‐nitrido carbonate (onc) entity. Because the latter two complex anions have never been observed before, we have chemically designed them using first‐principles structural searches, and we here predict the first hydrogen‐free guanidinates TCN3 (T = V, Nb, Ta) and ortho‐nitrido carbonates T’2CN4 (T’ = Ti, Zr, Hf) being mechanically stable at normal pressure; the latter should coexist as solid solutions with the stoichiometrically identical nitride carbodiimides and nitride guanidinates. We also suggest favorable exothermic reactions as useful signposts for eventual synthesis, and we trust that the decay of the novel compounds is unlikely due to presumably large kinetic activation barriers (C–N bond breaking) and quite substantial Madelung energies stabilizing the highly charged complex anions. While chemical‐bonding analysis reveals the novel CN48‒ to be more covalent compared to NCN2‒ and CN35‒ within related compounds, further electronic‐structure data of onc phases hint at their physicochemical potential in terms of photoelectrochemical water splitting and nonlinear optics.
https://ift.tt/3cL2zRE
