PRISM containment

Bright blue-green alcohol-containing prisms or needles from alcohol. Drying at 110 expels alcohol of crystn. Dec at about 263. Moderately sol in water with a violet-red color, in alcohol with a blue color. Solns are dichroic. use Histological stain (chromosomes). 

Crystallizes from water in large colourless prisms containing 2H2O. It is poisonous, causing paralysis of the nervous system m.p. 101 C (hydrate), 189°C (anhydrous), sublimes 157°C. It occurs as the free acid in beet leaves, and as potassium hydrogen oxalate in wood sorrel and rhubarb. Commercially, oxalic acid is made from sodium methanoate. This is obtained from anhydrous NaOH with CO at 150-200°C and 7-10 atm. At lower pressure sodium oxalate formed from the sodium salt the acid is readily liberated by sulphuric acid. Oxalic acid is also obtained as a by-product in the manufacture of citric acid and by the oxidation of carbohydrates with nitric acid in presence of V2O5. 

Figure B3.6.5. Phase diagram of a ternary polymer blend consisting of two homopolymers, A and B, and a synnnetric AB diblock copolymer as calculated by self-consistent field theory. All species have the same chain length A and the figure displays a cut tlirough the phase prism at%N= 11 (which corresponds to weak segregation). The phase diagram contains two homopolymer-rich phases A and B, a synnnetric lamellar phase L and asynnnetric lamellar phases, which are rich in the A component or rich in the B component ig, respectively. From Janert and Schick [68].

Oxalic Acid Dihydrate. OxaUc acid dihydrate is made up of odorless, colorless, monoclinic prisms or granules which contain 71.42 wt % anhydrous oxaUc acid and 28.58 wt % water. 

Sodium thiosulfate, either the anhydrous salt, Na2S202, or the crystalline pentahydrate, is commonly referred to as hypo or crystal hypo. When a concentrated sodium thiosulfate solution (50—60 wt %) is cooled to <48° C, the pentahydrate, containing 63.7% Na2S202, crystallines in monoclinic transparent prisms as shown in the equiUbrium phase diagram (Fig. 1). The monohydrate [55755-19-6] and the heptahydrate [36989-91-0] are also known. 

The phosphido complex, U(PPP)4 [163823-64-9] (PPP = P(CH2CH2P(CH3)2), was prepared and fully characterized (216). This complex was one of the first actinide complexes containing exclusively metal-phosphoms bonds. The x-ray stmctural analysis iadicated a distorted bicapped triganol prism with 3—3-electron donor phosphides and 1—1-electron phosphide, suggesting a formally 24-electron complex. Similar to the amido system, this phosphido compound is also reactive toward iasertion reactions, especially with CO (216). 

Acetylcholine bromide [66-23-9] M 226.1, m 143 , 146 . Hygroscopic solid but less than the hydrochloride salt. It crystd from EtOH as prisms. Some hydrolysis occurs in boiling EtOH particularly if it contains some H2O. It can also be recryst from EtOH or MeOH by adding dry Et20. [Acta Chem Scand 12 1492, 1497, 1502 1958.]... 

A more complex p helix is present in pectate lyase and the bacteriophage P22 tailspike protein. In these p helices each turn of the helix contains three short p strands, each with three to five residues, connected by loop regions. The p helix therefore comprises three parallel p sheets roughly arranged as the three sides of a prism. However, the cross-section of the p helix is not quite triangular because of the arrangement of the p sheets. Two of the sheets are... 

Theliterature contains many publications on self-made magnetic EEL spectrometers [2.182-2.196], and such systems have also been commercially available for many years. Several companies have developed such spectrometers, but the 90° magnetic prisms of the firm Gatan (parallel-detection EELS model 666 and the new Enfma model) are the only ones recently offered for TEM/STEM. Because they can easily be attached to a transmission microscope below its camera chamber, they are widely used. 

Tropic acid crystallises in prisms and melts at 117°. It contains an asymmetric carbon atom and can be resolved into d- and Z-forms, which, according to King, melt at 128-9°, and have [ajj, + 81-6° and — 81-2° (HjO) respectively. 

Anhalamine, C11H15O3N, occurs in microscopic needles, m.p. 187-8°. The hydrochloride, B. HCl. 2HjO, forms lustrous leaflets, m.p. 256-8° and the sulphate, Bg. H2SO4, colourless prisms the picrate has m.p. 234-6°. The base contains two methoxyl groups and one hydroxyl group. A dibenzoyl derivative, m.p. 128-9°, and a monobenzoyl derivative, m.p. 167-5°, are formed, the latter but not the former being soluble in alkalis. The methyl ether of anhalamine is identical with anhalinine, b.p. 130 0°/0-01 mm., m.p. 61-3°, and the A-methyl derivative is anhalidine, m.p. 131-3°. 

Anhalojiidine, C Hi OgN, crystallises in small octahedra, m.p. 160-1°. The hydrochloride, B. HCl, forms prisms, but the platinum and gold salts are amorphous the picrate has m.p. 201-8°. The alkaloid contains two methoxyl groups, yields a monobenzoyl derivative, m.p. 189° and with methyl iodide forms A-methylanhalonidine hydriodide (pellotine hydi-iodide), yellow prisms, m.p. 125-130°. 

Laudanine, C20H25O4N, was isolated by Hesse. The crude alkaloid is purified by recrj stallisation from dilute alcohol for the removal of small quantities of cryptopine, or it may be dissolved in acetic acid and the solution poured into dilute caustic soda, when this impurity is precipitated and laudanine may be recovered from the filtrate by addition of ammonium chloride. It still contains its isomeride laudanidine, which may be separated by repeated crystallisation of the hydrochlorides, laudanidine accumulating in the aqueous mother liquors. The base crystallises from dilute alcohol, or from a mixture of alcohol and chloroform in rhombic prisms, m.p. 166°, [a]o 0°. It dissolves in solutions of alkali hydroxides, fornung metallic derivatives, which are precipitated by excess of alkali, but is nearly insoluble in solution of ammonia. The salts crystallise well ... 

---