Strontium picrate

Strontium Picrate. [CeH2(N02)3.0] 2Sr, mw 544.92 N 15.43% yellow salt, explds fairly violently at 340—45°. Can be prepd by heating any of its hydrates to 200°. The monohydrate is a yel powd which explds at the same temp as the anhydr salt... 

Several classes of synthesized calixarenes bearing several moieties (ether, ester, and amide derivatives), were tested for the extraction of strontium picrates (from aqueous solutions into dichloromethane).128 Only a few of them show appreciable extraction levels. The p-i-butyl calix[6]arene hexa(di-/V-ethyl)amide (CA4) shows a very high extraction level of alkaline earth cations with respect to alkali metal cations. Moreover, dealkylation of the calix[6]arene hcxa(di-/V-cthyl)amidc (CA5) decreases the extraction of both sodium and strontium. As this decrease is much more important for sodium than for strontium, the Sr/Na selectivity, which increases from 3.12 to 9.4, is better than that achieved for DC18 derivative under the same conditions (8.7). These results were confirmed by extraction of strontium (5 x 10 4 M) from 1 M HN03 solutions, where it was found that p-t-butyl calix[4]arene tetra(di-N-ethyl) amide (CA2) (10 2 M in NPOE) extracts only sodium (DNa = 12.3, DSl < 0.001). 

B. S. Mohite, S. M. Khopkar, Solvent extraction separation of strontium as 18-crown-6 complex with picrate ion, Anal. Chem., 59 (1987), 1200-1203. 

Tessier introduced the use of cryolite (AlNaaF ) for the yellow coloring of stars, lances, and Bengal lights. In his second edition he includes a chapter on the small pyrotechnic pieces which are knonm as Japanese fireworks, giving formulas for them, and another on the picrates, which he studied extensively. The picrates of sodium, potassium, and ammonium crystallize in the anhydrous condition. Those of barium, strontium, calcium, magnesium, zinc, iron, and copper are hygroscopic and contain considerable water of crystallization which makes them unfit for use in pyrotechnic compositions. Lead picrate, with 1 H3O, detonates... 

The first nam used ammonium picratc together with barium nitrate, strontium nitrate, etc. the last used the picrates of strontium and barium, which, however, have to be fired by means of a. fuse. These mixtures are best made by the manufacturer himself from picric... 

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