Propane 2.3- -, crystal structure

The accuracy of the A vsi-value method is impressive, considering the fact that the method preceded the knowledge of the crystal structure. Carson and Katz (1942) labeled their charts as tentative, yet the original methane, ethane, and propane charts continue to be useful. The KVS1 chart of methane was constructed from three data points at 4.14 MPa (600 psia), while the curves at other pressures were based on two data points and drawn symmetrically to the curve at 4.14 MPa (Katz, D.L. Personal Communication, November 14, 1983). 

It should be thermodynamically impossible for one set of Kvst charts to serve both hydrate structures (si and sll), due to different energies of formation. That is, the Kysi at a given temperature for methane in a mixture of si formers cannot be the same as that for methane in a mixture of sll formers because the crystal structures differ dramatically. Different crystal structures result in different xst values that are the denominator of Kvst (= yt/xSi). However, the Katz Kvst charts do not allow for this possibility because they were generated before the two crystal structures were known. The inaccuracy may be lessened because, in addition to the major component methane, most natural gases contain small amounts of components such as ethane, propane, and isobutane, which cause sll to predominate in production/transportation/processing applications. 

Figure 10.44 X-ray crystal structure of the capsular, propan-2-ol linked Ms([4] resorcarene) portion of the co-crystal of 6.3 (R = CH2CH2Ph) with C60.48...

Figure 47 Schematic pathway of reversible space group change (A) supramolecular array of complex of DGTD diselenide with toluene (B) crystals surrounded by vapour of guest molecules (C) supramolecular array of complex diselenide with propan-l-ol. The bottom traces below the solid line show appropriate 31P CP/MAS spectra for crystalline complexes and intermediate crystal structures. Taken from Ref. [229].

Jones RDG (1976) The crystal structure of the enol tautomer of 1,3-diphenyl-1,3-propane-dione (dibenzoylmethane) by neutron diffraction. Acta Cryst B32 1807-1811... 

The reaction of butyltin trichloride with l-(2-methyl-2,3-dihydrobenzotriazol-2-yl)-propan-2-one gives an organotin complex that was formulated as containing the [BuSn(OH)Cl3]2 anion " . However, a reinvestigation of the crystal structure of this complex reveals a neutral hydroxyl-bridged aqua-butyldichlorotin hydroxide dimer that is linked to four 2-methylbenzothiazole molecules by short hydrogen bonds " . 

The crystal structure of DD (from Kl. oxytoca) was solved as the complex with vitamin B12 (1) and (5 )-propane-1,2-diol. It showed the corrinoid to be bound at an interdomain-interface (of the Bi2-binding jS-subunit and of the substrate-binding a-subunit) and confirmed the base-on nature of the bound corrinoid. The crystal structure showed the corrin-bound cobalt ion to be (largely) pentacoordinated, with an axial Co-Nq, bond with 2.5 A length, and the diol substrate to be ligating the potassium ion, which is situated at a distance of 11.7 A from the cobalt center of the corrinoid. The diol substrate is also bound via a tight net of H bonds to polar... 

The crystal structures of glycylaminomethylphosphonic acid, and of methane-, ethane-, and propane-diphosphonic acids, have been determined. The unit cell of the last acid contains two molecules, with different conformations. The molecular structures of the constrained phosphite (161), the phosphate (162), and the thio-phosphate (163) have been compared. The nitrogen in the last compound is very nearly trigonal planar, and the large P—N distance (313 pm) shows that there is little P - - N interaction. The phosphazene (164) adopts a novel conformation, ... 

The binuclear iron(III) complex [Fe2(HPTP)(p-OH)(N03)2](C104)2 (1) with HPTP = A W,7W,-tetrakis(2-pyridyl methyl)-2-hydroxy-1,3-diamino-propane [5], reacts with H2O2 to yield a blue species [6], The crystal structure of (1) and its interaction with montmorillonites (MMT) has been reported [7]. The occlusion of [Fe2(HPTP)(p-OH)] complexes in new families of hexagonal mesoporous materials such as MCM-41 and HMS will be described elsewhere [8], Related HPTB complexes, with benzimidazole instead of pyridine, have their tripodal N atoms tmns to strong basic peroxo-ligands, the benzimidazole ligands perpendicular to the Fc203 plane and tmns to each other on every iron [9]. 

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