User talk:Riventree

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E vs X[edit]

Re sodium selenide: you think that X is significantly better than E? Not a big deal, but just curious. --Smokefoot (talk) 03:21, 10 January 2015 (UTC)

It was because it was partially in organic-ese. Combined with the "Me" for Methanol, I kept reading "E" as "Et" Ethanol. WP generally uses X for a generic halide, so I followed on that way. It was a just a legibility thing.
On a related note: I am happy to defer to you in stuff like this. I'm a serious-ish hobbyist. You, MaterialScientist, Edgar181 and others who (presumably) do this for a living are reasons that WP is a good source of chemical info. Most of my changes (in WP in general) are grammar, spelling, reorg, etc.
Thirdly, I liked your argument for WP:SECONDARY. Mea maxima culpa.
Youre doing fine, I was just curious if you knew something special. I fell for using E as a symbol for non-halide "element" a number of years ago. But there is nothing official. Probably somewhere there is an official explanation of all this. --Smokefoot (talk) 15:57, 10 January 2015 (UTC)

N2 fixation[edit]

Hi again. For a hobbyist, you certainly get into the advanced stuff. If you get a chance, take a look at older reviews on abiological nitrogen fixation. I am pretty sure the Russians catalyzed N2 fixation with organoTi compounds in the mid 1960's. The key authors Vol'pin and Shur. Shilov followed up. The problem, to my mind, is that the US/IK contingent has always been envious of Russian precedent. Consequently US/UK-based reviews often marginalize that work because intermediates were not crystallized and mechanisms are slightly dorky. The Russian precedent induced US workers to get into the titanocene-N2 business. At least that is my perspective.

Here is an excerpt from Chatt's 1972 review "Vol'pin and co-workers, using a non-protic Lewis acid, aluminium tribromide, were able to demonstrate the truly catalytic effect of titanium by treating dinitrogen with a mixture of titanium tetrachloride, metallic aluminium, and aluminium tribromide at 50 °C, either in the absence or in the presence of a solvent, e.g. benzene. As much as 200 mol of ammonia per mol of TiCl4 was obtained after hydrolysis....The above nitriding systems ..." Chatt describes the Russian work as nitriding systems, implying that his and Taube's approach using well defined N2 complexes was distinct and perhaps more refined. . --Smokefoot (talk) 16:20, 18 January 2015 (UTC)

Yikes! Was that in the reference? The reference I saw (and deleted) was mostly theory about which compounds COULD be thermodynamically possible, with graphs showing the favorability of N2 + hydrocarbons in and Ammonia + "thinner" hydrocarbons out. I didn't make the change based on anything but the content cited.
Riventree (talk) 01:43, 19 January 2015 (UTC)
No need for yikes. Its just that Shilov and especially Vol'pin did catalyze N2 to ammonia in the 1960's. Schrock's system is impressively well defined and homogeneous and all that. But decades before him, nitrogen fixation had been demonstrated. Take your time in digging through this theme, there is so much literature that results from the 60's are barely mentioned. --Smokefoot (talk) 02:27, 19 January 2015 (UTC)
Thanks for the pointer!
Riventree (talk) 02:29, 19 January 2015 (UTC)
Here is a quote from the intro in Schrock's Science 2003 paper "Hundreds of N2 complexes are now known, but only a few reports of the catalytic reduction of N2 to NH3 have appeared (18, 23–27)...." It seems likely that Schrock did a thorough job checking the background. You can see Shilov is prominently mentioned. #18: T. A. Bazhenova, A. E. Shilov, Coord. Chem. Rev. 144, 69 (1995)... #23: C. R. Dickson, A. J. Nozik, J. Am. Chem. Soc. 100, 8007 (1978). #24: A. E. Shilov, J. Mol. Catal. 41, 221 (1987). #25: K. Komori, H. Oshita, Y. Mizobe, M. Hidai, J. Am. Chem. Soc. 111, 1939 (1989). #26 K. Tanaka, Y. Hozumi, T. Tanaka, Chem. Lett. 1982, 1203 (1982). #J. O. Dziegielewski, R. Grzybek, Polyhedron 9, 645 (1990).--Smokefoot (talk) 15:13, 19 January 2015 (UTC)

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Cement[edit]

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