Triangular hydrogen

The classification of amorphous carbon films according to carbon bond type and hydrogen content can be represented in a triangular diagram, Fig. 6 [e.g., 70]. The comers at the base of the triangle correspond to graphite (100% sp carbon) and diamond (100% sp carbon). The apex represents 100% H, but the upper limit for formation of solid films is defined by the tie line between the compositions of polyethene, -(CH2) -, and polyethyne, -(CH) -. 

Fig. 9. Schematic representations of the canal structures of (a) urea and (b) thiourea, drawn to emphasise the similarities and differences between them, Each triangular host molecule is denoted by a stippled triangle, with the NH2 functions at the ends of the vertical edge. Oxygen or sulfur atoms lie in layers, outlined by the dotted hexagons. The thick inter-host lines are hydrogen bonds each O or S atom is involved in four hydrogen bonds, and each NH2 function is involved in two...

Available data on explosibility of chlorine and hydrogen in admixture with air, hydrogen chloride, oxygen or inert gases is discussed and presented as triangular or rectangular diagrams. 

A triangular diagram shows the range of explosive mixtures in the hydrogen peroxide-benzene-water ternary system, and also includes data for various oxygenated water-soluble organic compounds. 

Contact of the acid with sec- or fc/7-alcohols, even with cooling, may lead to violent explosions [1], The autodetonation region which exists for the hydrogen peroxide-sulfuric acid -2-propanol or-/e/7-butanol system is shown on a triangular diagram [2],... 

More recently, Adams and coworkers have provided a very interesting case of heteronuclear clusters that are very active for the hydrogenation of alkynes [4, 54, 55]. The high-nuclearity layer-segregated Pt-Ru complex [Pt3Ru6(CO)21(jU3-H)(/ -H)j], consisting of three stacked triangular layers of metal atoms with an... 

Palladium acetate has an unusual structure that comprises three palladium atoms in a triangular arrangement, held together by six bridging acetate groups. Details of the structure of the complex have been reported [75]. The catalyst has been used for the hydrogenation of both nitrile rubber and natural rubber [74-76],... 

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